class Canvas(QtWidgets.QWidget):
zoomRequest = QtCore.Signal(int, QtCore.QPoint)
scrollRequest = QtCore.Signal(int, int)
newShape = QtCore.Signal()
selectionChanged = QtCore.Signal(bool)
shapeMoved = QtCore.Signal()
drawingPolygon = QtCore.Signal(bool)
edgeSelected = QtCore.Signal(bool)
CREATE, EDIT = 0, 1
# polygon, rectangle, line, or point
_createMode = 'polygon'
_fill_drawing = False
def __init__(self, *args, **kwargs):
self.epsilon = kwargs.pop('epsilon', 10.0)
super(Canvas, self).__init__(*args, **kwargs)
# Initialise local state.
self.mode = self.EDIT
self.shapes = []
self.shapesBackups = []
self.current = None
self.selectedShape = None # save the selected shape here
self.selectedShapeCopy = None
self.lineColor = QtGui.QColor(0, 0, 255)
# self.line represents:
# - createMode == 'polygon': edge from last point to current
# - createMode == 'rectangle': diagonal line of the rectangle
# - createMode == 'line': the line
# - createMode == 'point': the point
self.line = Shape(line_color=self.lineColor)
self.prevPoint = QtCore.QPoint()
self.prevMovePoint = QtCore.QPoint()
self.offsets = QtCore.QPoint(), QtCore.QPoint()
self.scale = 1.0
self.pixmap = QtGui.QPixmap()
self.visible = {}
self._hideBackround = False
self.hideBackround = False
self.hShape = None
self.hVertex = None
self.hEdge = None
self.movingShape = False
self._painter = QtGui.QPainter()
self._cursor = CURSOR_DEFAULT
# Menus:
self.menus = (QtWidgets.QMenu(), QtWidgets.QMenu())
# Set widget options.
self.setMouseTracking(True)
self.setFocusPolicy(QtCore.Qt.WheelFocus)
def fillDrawing(self):
return self._fill_drawing
def setFillDrawing(self, value):
self._fill_drawing = value
@property
def createMode(self):
return self._createMode
@createMode.setter
def createMode(self, value):
if value not in [
'polygon', 'rectangle', 'circle', 'line', 'point', 'linestrip'
]:
raise ValueError('Unsupported createMode: %s' % value)
self._createMode = value
def storeShapes(self):
shapesBackup = []
for shape in self.shapes:
shapesBackup.append(shape.copy())
if len(self.shapesBackups) >= 10:
self.shapesBackups = self.shapesBackups[-9:]
self.shapesBackups.append(shapesBackup)
@property
def isShapeRestorable(self):
if len(self.shapesBackups) < 2:
return False
return True
def restoreShape(self):
if not self.isShapeRestorable:
return
self.shapesBackups.pop() # latest
shapesBackup = self.shapesBackups.pop()
self.shapes = shapesBackup
self.storeShapes()
self.repaint()
def enterEvent(self, ev):
self.overrideCursor(self._cursor)
def leaveEvent(self, ev):
self.restoreCursor()
def focusOutEvent(self, ev):
self.restoreCursor()
def isVisible(self, shape):
return self.visible.get(shape, True)
def drawing(self):
return self.mode == self.CREATE
def editing(self):
return self.mode == self.EDIT
def setEditing(self, value=True):
self.mode = self.EDIT if value else self.CREATE
if not value: # Create
self.unHighlight()
self.deSelectShape()
def unHighlight(self):
if self.hShape:
self.hShape.highlightClear()
self.hVertex = self.hShape = None
def selectedVertex(self):
return self.hVertex is not None
def mouseMoveEvent(self, ev):
"""Update line with last point and current coordinates."""
try:
if QT5:
pos = self.transformPos(ev.pos())
else:
pos = self.transformPos(ev.posF())
except AttributeError:
return
self.prevMovePoint = pos
self.restoreCursor()
# Polygon drawing.
if self.drawing():
self.line.shape_type = self.createMode
self.overrideCursor(CURSOR_DRAW)
if not self.current:
return
color = self.lineColor
if self.outOfPixmap(pos):
# Don't allow the user to draw outside the pixmap.
# Project the point to the pixmap's edges.
pos = self.intersectionPoint(self.current[-1], pos)
elif len(self.current) > 1 and self.createMode == 'polygon' and\
self.closeEnough(pos, self.current[0]):
# Attract line to starting point and
# colorise to alert the user.
pos = self.current[0]
color = self.current.line_color
self.overrideCursor(CURSOR_POINT)
self.current.highlightVertex(0, Shape.NEAR_VERTEX)
if self.createMode in ['polygon', 'linestrip']:
self.line[0] = self.current[-1]
self.line[1] = pos
elif self.createMode == 'rectangle':
self.line.points = [self.current[0], pos]
self.line.close()
elif self.createMode == 'circle':
self.line.points = [self.current[0], pos]
self.line.shape_type = "circle"
elif self.createMode == 'line':
self.line.points = [self.current[0], pos]
self.line.close()
elif self.createMode == 'point':
self.line.points = [self.current[0]]
self.line.close()
self.line.line_color = color
self.repaint()
self.current.highlightClear()
return
# Polygon copy moving.
if QtCore.Qt.RightButton & ev.buttons():
if self.selectedShapeCopy and self.prevPoint:
self.overrideCursor(CURSOR_MOVE)
self.boundedMoveShape(self.selectedShapeCopy, pos)
self.repaint()
elif self.selectedShape:
self.selectedShapeCopy = self.selectedShape.copy()
self.repaint()
return
# Polygon/Vertex moving.
self.movingShape = False
if QtCore.Qt.LeftButton & ev.buttons():
if self.selectedVertex():
self.boundedMoveVertex(pos)
self.repaint()
self.movingShape = True
elif self.selectedShape and self.prevPoint:
self.overrideCursor(CURSOR_MOVE)
self.boundedMoveShape(self.selectedShape, pos)
self.repaint()
self.movingShape = True
return
# Just hovering over the canvas, 2 posibilities:
# - Highlight shapes
# - Highlight vertex
# Update shape/vertex fill and tooltip value accordingly.
self.setToolTip("Image")
for shape in reversed([s for s in self.shapes if self.isVisible(s)]):
# Look for a nearby vertex to highlight. If that fails,
# check if we happen to be inside a shape.
index = shape.nearestVertex(pos, self.epsilon / self.scale)
index_edge = shape.nearestEdge(pos, self.epsilon / self.scale)
if index is not None:
if self.selectedVertex():
self.hShape.highlightClear()
self.hVertex = index
self.hShape = shape
self.hEdge = index_edge
shape.highlightVertex(index, shape.MOVE_VERTEX)
self.overrideCursor(CURSOR_POINT)
self.setToolTip("Click & drag to move point")
self.setStatusTip(self.toolTip())
self.update()
break
elif shape.containsPoint(pos):
if self.selectedVertex():
self.hShape.highlightClear()
self.hVertex = None
self.hShape = shape
self.hEdge = index_edge
self.setToolTip("Click & drag to move shape '%s'" %
shape.label)
self.setStatusTip(self.toolTip())
self.overrideCursor(CURSOR_GRAB)
self.update()
break
else: # Nothing found, clear highlights, reset state.
if self.hShape:
self.hShape.highlightClear()
self.update()
self.hVertex, self.hShape, self.hEdge = None, None, None
self.edgeSelected.emit(self.hEdge is not None)
def addPointToEdge(self):
if (self.hShape is None and self.hEdge is None
and self.prevMovePoint is None):
return
shape = self.hShape
index = self.hEdge
point = self.prevMovePoint
shape.insertPoint(index, point)
shape.highlightVertex(index, shape.MOVE_VERTEX)
self.hShape = shape
self.hVertex = index
self.hEdge = None
def mousePressEvent(self, ev):
if QT5:
pos = self.transformPos(ev.pos())
else:
pos = self.transformPos(ev.posF())
if ev.button() == QtCore.Qt.LeftButton:
if self.drawing():
if self.current:
# Add point to existing shape.
if self.createMode == 'polygon':
self.current.addPoint(self.line[1])
self.line[0] = self.current[-1]
if self.current.isClosed():
self.finalise()
elif self.createMode in ['rectangle', 'circle', 'line']:
assert len(self.current.points) == 1
self.current.points = self.line.points
self.finalise()
elif self.createMode == 'linestrip':
self.current.addPoint(self.line[1])
self.line[0] = self.current[-1]
if int(ev.modifiers()) == QtCore.Qt.ControlModifier:
self.finalise()
elif not self.outOfPixmap(pos):
# Create new shape.
self.current = Shape(shape_type=self.createMode)
self.current.addPoint(pos)
if self.createMode == 'point':
self.finalise()
else:
if self.createMode == 'circle':
self.current.shape_type = 'circle'
self.line.points = [pos, pos]
self.setHiding()
self.drawingPolygon.emit(True)
self.update()
else:
self.selectShapePoint(pos)
self.prevPoint = pos
self.repaint()
elif ev.button() == QtCore.Qt.RightButton and self.editing():
self.selectShapePoint(pos)
self.prevPoint = pos
self.repaint()
def mouseReleaseEvent(self, ev):
if ev.button() == QtCore.Qt.RightButton:
menu = self.menus[bool(self.selectedShapeCopy)]
self.restoreCursor()
if not menu.exec_(self.mapToGlobal(ev.pos()))\
and self.selectedShapeCopy:
# Cancel the move by deleting the shadow copy.
self.selectedShapeCopy = None
self.repaint()
elif ev.button() == QtCore.Qt.LeftButton and self.selectedShape:
self.overrideCursor(CURSOR_GRAB)
if self.movingShape:
self.storeShapes()
self.shapeMoved.emit()
def endMove(self, copy=False):
assert self.selectedShape and self.selectedShapeCopy
shape = self.selectedShapeCopy
# del shape.fill_color
# del shape.line_color
if copy:
self.shapes.append(shape)
self.selectedShape.selected = False
self.selectedShape = shape
self.repaint()
else:
shape.label = self.selectedShape.label
self.deleteSelected()
self.shapes.append(shape)
self.storeShapes()
self.selectedShapeCopy = None
def hideBackroundShapes(self, value):
self.hideBackround = value
if self.selectedShape:
# Only hide other shapes if there is a current selection.
# Otherwise the user will not be able to select a shape.
self.setHiding(True)
self.repaint()
def setHiding(self, enable=True):
self._hideBackround = self.hideBackround if enable else False
def canCloseShape(self):
return self.drawing() and self.current and len(self.current) > 2
def mouseDoubleClickEvent(self, ev):
# We need at least 4 points here, since the mousePress handler
# adds an extra one before this handler is called.
if self.canCloseShape() and len(self.current) > 3:
self.current.popPoint()
self.finalise()
def selectShape(self, shape):
self.deSelectShape()
shape.selected = True
self.selectedShape = shape
self.setHiding()
self.selectionChanged.emit(True)
self.update()
def selectShapePoint(self, point):
"""Select the first shape created which contains this point."""
self.deSelectShape()
if self.selectedVertex(): # A vertex is marked for selection.
index, shape = self.hVertex, self.hShape
shape.highlightVertex(index, shape.MOVE_VERTEX)
return
for shape in reversed(self.shapes):
if self.isVisible(shape) and shape.containsPoint(point):
shape.selected = True
self.selectedShape = shape
self.calculateOffsets(shape, point)
self.setHiding()
self.selectionChanged.emit(True)
return
def calculateOffsets(self, shape, point):
rect = shape.boundingRect()
x1 = rect.x() - point.x()
y1 = rect.y() - point.y()
x2 = (rect.x() + rect.width() - 1) - point.x()
y2 = (rect.y() + rect.height() - 1) - point.y()
self.offsets = QtCore.QPoint(x1, y1), QtCore.QPoint(x2, y2)
def boundedMoveVertex(self, pos):
index, shape = self.hVertex, self.hShape
point = shape[index]
if self.outOfPixmap(pos):
pos = self.intersectionPoint(point, pos)
shape.moveVertexBy(index, pos - point)
def boundedMoveShape(self, shape, pos):
if self.outOfPixmap(pos):
return False # No need to move
o1 = pos + self.offsets[0]
if self.outOfPixmap(o1):
pos -= QtCore.QPoint(min(0, o1.x()), min(0, o1.y()))
o2 = pos + self.offsets[1]
if self.outOfPixmap(o2):
pos += QtCore.QPoint(min(0,
self.pixmap.width() - o2.x()),
min(0,
self.pixmap.height() - o2.y()))
# XXX: The next line tracks the new position of the cursor
# relative to the shape, but also results in making it
# a bit "shaky" when nearing the border and allows it to
# go outside of the shape's area for some reason.
# self.calculateOffsets(self.selectedShape, pos)
dp = pos - self.prevPoint
if dp:
shape.moveBy(dp)
self.prevPoint = pos
return True
return False
def deSelectShape(self):
if self.selectedShape:
self.selectedShape.selected = False
self.selectedShape = None
self.setHiding(False)
self.selectionChanged.emit(False)
self.update()
def deleteSelected(self):
if self.selectedShape:
shape = self.selectedShape
self.shapes.remove(self.selectedShape)
self.storeShapes()
self.selectedShape = None
self.update()
return shape
def copySelectedShape(self):
if self.selectedShape:
shape = self.selectedShape.copy()
self.deSelectShape()
self.shapes.append(shape)
self.storeShapes()
shape.selected = True
self.selectedShape = shape
self.boundedShiftShape(shape)
return shape
def boundedShiftShape(self, shape):
# Try to move in one direction, and if it fails in another.
# Give up if both fail.
point = shape[0]
offset = QtCore.QPoint(2.0, 2.0)
self.calculateOffsets(shape, point)
self.prevPoint = point
if not self.boundedMoveShape(shape, point - offset):
self.boundedMoveShape(shape, point + offset)
def paintEvent(self, event):
if not self.pixmap:
return super(Canvas, self).paintEvent(event)
p = self._painter
p.begin(self)
p.setRenderHint(QtGui.QPainter.Antialiasing)
p.setRenderHint(QtGui.QPainter.HighQualityAntialiasing)
p.setRenderHint(QtGui.QPainter.SmoothPixmapTransform)
p.scale(self.scale, self.scale)
p.translate(self.offsetToCenter())
p.drawPixmap(0, 0, self.pixmap)
Shape.scale = self.scale
for shape in self.shapes:
if (shape.selected or not self._hideBackround) and \
self.isVisible(shape):
shape.fill = shape.selected or shape == self.hShape
shape.paint(p)
if self.current:
self.current.paint(p)
self.line.paint(p)
if self.selectedShapeCopy:
self.selectedShapeCopy.paint(p)
if (self.fillDrawing() and self.createMode == 'polygon'
and self.current is not None
and len(self.current.points) >= 2):
drawing_shape = self.current.copy()
drawing_shape.addPoint(self.line[1])
drawing_shape.fill = True
drawing_shape.fill_color.setAlpha(64)
drawing_shape.paint(p)
p.end()
def transformPos(self, point):
"""Convert from widget-logical coordinates to painter-logical ones."""
return point / self.scale - self.offsetToCenter()
def offsetToCenter(self):
s = self.scale
area = super(Canvas, self).size()
w, h = self.pixmap.width() * s, self.pixmap.height() * s
aw, ah = area.width(), area.height()
x = (aw - w) / (2 * s) if aw > w else 0
y = (ah - h) / (2 * s) if ah > h else 0
return QtCore.QPoint(x, y)
def outOfPixmap(self, p):
w, h = self.pixmap.width(), self.pixmap.height()
return not (0 <= p.x() < w and 0 <= p.y() < h)
def finalise(self):
assert self.current
self.current.close()
self.shapes.append(self.current)
self.storeShapes()
self.current = None
self.setHiding(False)
self.newShape.emit()
self.update()
def closeEnough(self, p1, p2):
# d = distance(p1 - p2)
# m = (p1-p2).manhattanLength()
# print "d %.2f, m %d, %.2f" % (d, m, d - m)
# divide by scale to allow more precision when zoomed in
return labelme.utils.distance(p1 - p2) < (self.epsilon / self.scale)
def intersectionPoint(self, p1, p2):
# Cycle through each image edge in clockwise fashion,
# and find the one intersecting the current line segment.
# http://paulbourke.net/geometry/lineline2d/
size = self.pixmap.size()
points = [(0, 0), (size.width() - 1, 0),
(size.width() - 1, size.height() - 1),
(0, size.height() - 1)]
x1, y1 = p1.x(), p1.y()
x2, y2 = p2.x(), p2.y()
d, i, (x, y) = min(self.intersectingEdges((x1, y1), (x2, y2), points))
x3, y3 = points[i]
x4, y4 = points[(i + 1) % 4]
if (x, y) == (x1, y1):
# Handle cases where previous point is on one of the edges.
if x3 == x4:
return QtCore.QPoint(x3, min(max(0, y2), max(y3, y4)))
else: # y3 == y4
return QtCore.QPoint(min(max(0, x2), max(x3, x4)), y3)
return QtCore.QPoint(x, y)
def intersectingEdges(self, point1, point2, points):
"""Find intersecting edges.
For each edge formed by `points', yield the intersection
with the line segment `(x1,y1) - (x2,y2)`, if it exists.
Also return the distance of `(x2,y2)' to the middle of the
edge along with its index, so that the one closest can be chosen.
"""
(x1, y1) = point1
(x2, y2) = point2
for i in range(4):
x3, y3 = points[i]
x4, y4 = points[(i + 1) % 4]
denom = (y4 - y3) * (x2 - x1) - (x4 - x3) * (y2 - y1)
nua = (x4 - x3) * (y1 - y3) - (y4 - y3) * (x1 - x3)
nub = (x2 - x1) * (y1 - y3) - (y2 - y1) * (x1 - x3)
if denom == 0:
# This covers two cases:
# nua == nub == 0: Coincident
# otherwise: Parallel
continue
ua, ub = nua / denom, nub / denom
if 0 <= ua <= 1 and 0 <= ub <= 1:
x = x1 + ua * (x2 - x1)
y = y1 + ua * (y2 - y1)
m = QtCore.QPoint((x3 + x4) / 2, (y3 + y4) / 2)
d = labelme.utils.distance(m - QtCore.QPoint(x2, y2))
yield d, i, (x, y)
# These two, along with a call to adjustSize are required for the
# scroll area.
def sizeHint(self):
return self.minimumSizeHint()
def minimumSizeHint(self):
if self.pixmap:
return self.scale * self.pixmap.size()
return super(Canvas, self).minimumSizeHint()
def wheelEvent(self, ev):
if QT5:
mods = ev.modifiers()
delta = ev.angleDelta()
if QtCore.Qt.ControlModifier == int(mods):
# with Ctrl/Command key
# zoom
self.zoomRequest.emit(delta.y(), ev.pos())
else:
# scroll
self.scrollRequest.emit(delta.x(), QtCore.Qt.Horizontal)
self.scrollRequest.emit(delta.y(), QtCore.Qt.Vertical)
else:
if ev.orientation() == QtCore.Qt.Vertical:
mods = ev.modifiers()
if QtCore.Qt.ControlModifier == int(mods):
# with Ctrl/Command key
self.zoomRequest.emit(ev.delta(), ev.pos())
else:
self.scrollRequest.emit(
ev.delta(), QtCore.Qt.Horizontal if
(QtCore.Qt.ShiftModifier
== int(mods)) else QtCore.Qt.Vertical)
else:
self.scrollRequest.emit(ev.delta(), QtCore.Qt.Horizontal)
ev.accept()
def keyPressEvent(self, ev):
key = ev.key()
if key == QtCore.Qt.Key_Escape and self.current:
self.current = None
self.drawingPolygon.emit(False)
self.update()
elif key == QtCore.Qt.Key_Return and self.canCloseShape():
self.finalise()
def setLastLabel(self, text, flags):
assert text
self.shapes[-1].label = text
self.shapes[-1].flags = flags
self.shapesBackups.pop()
self.storeShapes()
return self.shapes[-1]
def undoLastLine(self):
assert self.shapes
self.current = self.shapes.pop()
self.current.setOpen()
if self.createMode in ['polygon', 'linestrip']:
self.line.points = [self.current[-1], self.current[0]]
elif self.createMode in ['rectangle', 'line', 'circle']:
self.current.points = self.current.points[0:1]
elif self.createMode == 'point':
self.current = None
self.drawingPolygon.emit(True)
def undoLastPoint(self):
if not self.current or self.current.isClosed():
return
self.current.popPoint()
if len(self.current) > 0:
self.line[0] = self.current[-1]
else:
self.current = None
self.drawingPolygon.emit(False)
self.repaint()
def loadPixmap(self, pixmap):
self.pixmap = pixmap
self.shapes = []
self.repaint()
def loadShapes(self, shapes, replace=True):
if replace:
self.shapes = list(shapes)
else:
self.shapes.extend(shapes)
self.storeShapes()
self.current = None
self.repaint()
def setShapeVisible(self, shape, value):
self.visible[shape] = value
self.repaint()
def overrideCursor(self, cursor):
self.restoreCursor()
self._cursor = cursor
QtWidgets.QApplication.setOverrideCursor(cursor)
def restoreCursor(self):
QtWidgets.QApplication.restoreOverrideCursor()
def resetState(self):
self.restoreCursor()
self.pixmap = None
self.shapesBackups = []
self.update()
class Canvas(QWidget):
zoomRequest = pyqtSignal(int)
scrollRequest = pyqtSignal(int, int)
newShape = pyqtSignal()
selectionChanged = pyqtSignal(bool)
shapeMoved = pyqtSignal()
drawingPolygon = pyqtSignal(bool)
CREATE, EDIT = range(2)
epsilon = 11.0
def __init__(self, *args, **kwargs):
super(Canvas, self).__init__(*args, **kwargs)
# Initialise local state.
self.mode = self.EDIT
self.shapes = []
self.current = None
self.selectedShape = None # save the selected shape here
self.selectedShapeCopy = None
self.lineColor = QColor(0, 0, 255)
self.line = Shape(line_color=self.lineColor)
self.prevPoint = QPointF()
self.offsets = QPointF(), QPointF()
self.scale = 1.0
self.pixmap = QPixmap()
self.visible = {}
self._hideBackround = False
self.hideBackround = False
self.hShape = None
self.hVertex = None
self._painter = QPainter()
self._cursor = CURSOR_DEFAULT
# Menus:
self.menus = (QMenu(), QMenu())
# Set widget options.
self.setMouseTracking(True)
self.setFocusPolicy(Qt.WheelFocus)
def enterEvent(self, ev):
self.overrideCursor(self._cursor)
def leaveEvent(self, ev):
self.restoreCursor()
def focusOutEvent(self, ev):
self.restoreCursor()
def isVisible(self, shape):
return self.visible.get(shape, True)
def drawing(self):
return self.mode == self.CREATE
def editing(self):
return self.mode == self.EDIT
def setEditing(self, value=True):
self.mode = self.EDIT if value else self.CREATE
if not value: # Create
self.unHighlight()
self.deSelectShape()
def unHighlight(self):
if self.hShape:
self.hShape.highlightClear()
self.hVertex = self.hShape = None
def selectedVertex(self):
return self.hVertex is not None
def mouseMoveEvent(self, ev):
"""Update line with last point and current coordinates."""
pos = self.transformPos(ev.localPos())
self.restoreCursor()
# Polygon drawing.
if self.drawing():
self.overrideCursor(CURSOR_DRAW)
if self.current:
color = self.lineColor
if self.outOfPixmap(pos):
# Don't allow the user to draw outside the pixmap.
# Project the point to the pixmap's edges.
pos = self.intersectionPoint(self.current[-1], pos)
elif len(self.current) > 1 and self.closeEnough(
pos, self.current[0]):
# Attract line to starting point and colorise to alert the user:
pos = self.current[0]
color = self.current.line_color
self.overrideCursor(CURSOR_POINT)
self.current.highlightVertex(0, Shape.NEAR_VERTEX)
self.line[1] = pos
self.line.line_color = color
self.repaint()
self.current.highlightClear()
return
# Polygon copy moving.
if Qt.RightButton & ev.buttons():
if self.selectedShapeCopy and self.prevPoint:
self.overrideCursor(CURSOR_MOVE)
self.boundedMoveShape(self.selectedShapeCopy, pos)
self.repaint()
elif self.selectedShape:
self.selectedShapeCopy = self.selectedShape.copy()
self.repaint()
return
# Polygon/Vertex moving.
if Qt.LeftButton & ev.buttons():
if self.selectedVertex():
self.boundedMoveVertex(pos)
self.shapeMoved.emit()
self.repaint()
elif self.selectedShape and self.prevPoint:
self.overrideCursor(CURSOR_MOVE)
self.boundedMoveShape(self.selectedShape, pos)
self.shapeMoved.emit()
self.repaint()
return
# Just hovering over the canvas, 2 posibilities:
# - Highlight shapes
# - Highlight vertex
# Update shape/vertex fill and tooltip value accordingly.
self.setToolTip("Image")
for shape in reversed([s for s in self.shapes if self.isVisible(s)]):
# Look for a nearby vertex to highlight. If that fails,
# check if we happen to be inside a shape.
index = shape.nearestVertex(pos, self.epsilon)
if index is not None:
if self.selectedVertex():
self.hShape.highlightClear()
self.hVertex, self.hShape = index, shape
shape.highlightVertex(index, shape.MOVE_VERTEX)
self.overrideCursor(CURSOR_POINT)
self.setToolTip("Click & drag to move point")
self.setStatusTip(self.toolTip())
self.update()
break
elif shape.containsPoint(pos):
if self.selectedVertex():
self.hShape.highlightClear()
self.hVertex, self.hShape = None, shape
self.setToolTip("Click & drag to move shape '%s'" %
shape.label)
self.setStatusTip(self.toolTip())
self.overrideCursor(CURSOR_GRAB)
self.update()
break
else: # Nothing found, clear highlights, reset state.
if self.hShape:
self.hShape.highlightClear()
self.update()
self.hVertex, self.hShape = None, None
def mousePressEvent(self, ev):
pos = self.transformPos(ev.localPos())
if ev.button() == Qt.LeftButton:
if self.drawing():
if self.current:
self.current.addPoint(self.line[1])
self.line[0] = self.current[-1]
if self.current.isClosed():
self.finalise()
elif not self.outOfPixmap(pos):
self.current = Shape()
self.current.addPoint(pos)
self.line.points = [pos, pos]
self.setHiding()
self.drawingPolygon.emit(True)
self.update()
else:
self.selectShapePoint(pos)
self.prevPoint = pos
self.repaint()
elif ev.button() == Qt.RightButton and self.editing():
self.selectShapePoint(pos)
self.prevPoint = pos
self.repaint()
def mouseReleaseEvent(self, ev):
if ev.button() == Qt.RightButton:
menu = self.menus[bool(self.selectedShapeCopy)]
self.restoreCursor()
if not menu.exec_(self.mapToGlobal(ev.pos()))\
and self.selectedShapeCopy:
# Cancel the move by deleting the shadow copy.
self.selectedShapeCopy = None
self.repaint()
elif ev.button() == Qt.LeftButton and self.selectedShape:
self.overrideCursor(CURSOR_GRAB)
def endMove(self, copy=False):
assert self.selectedShape and self.selectedShapeCopy
shape = self.selectedShapeCopy
#del shape.fill_color
#del shape.line_color
if copy:
self.shapes.append(shape)
self.selectedShape.selected = False
self.selectedShape = shape
self.repaint()
else:
shape.label = self.selectedShape.label
self.deleteSelected()
self.shapes.append(shape)
self.selectedShapeCopy = None
def hideBackroundShapes(self, value):
self.hideBackround = value
if self.selectedShape:
# Only hide other shapes if there is a current selection.
# Otherwise the user will not be able to select a shape.
self.setHiding(True)
self.repaint()
def setHiding(self, enable=True):
self._hideBackround = self.hideBackround if enable else False
def canCloseShape(self):
return self.drawing() and self.current and len(self.current) > 2
def mouseDoubleClickEvent(self, ev):
# We need at least 4 points here, since the mousePress handler
# adds an extra one before this handler is called.
if self.canCloseShape() and len(self.current) > 3:
self.current.popPoint()
self.finalise()
def selectShape(self, shape):
self.deSelectShape()
shape.selected = True
self.selectedShape = shape
self.setHiding()
self.selectionChanged.emit(True)
self.update()
def selectShapePoint(self, point):
"""Select the first shape created which contains this point."""
self.deSelectShape()
if self.selectedVertex(): # A vertex is marked for selection.
index, shape = self.hVertex, self.hShape
shape.highlightVertex(index, shape.MOVE_VERTEX)
return
for shape in reversed(self.shapes):
if self.isVisible(shape) and shape.containsPoint(point):
shape.selected = True
self.selectedShape = shape
self.calculateOffsets(shape, point)
self.setHiding()
self.selectionChanged.emit(True)
return
def calculateOffsets(self, shape, point):
rect = shape.boundingRect()
x1 = rect.x() - point.x()
y1 = rect.y() - point.y()
x2 = (rect.x() + rect.width()) - point.x()
y2 = (rect.y() + rect.height()) - point.y()
self.offsets = QPointF(x1, y1), QPointF(x2, y2)
def boundedMoveVertex(self, pos):
index, shape = self.hVertex, self.hShape
point = shape[index]
if self.outOfPixmap(pos):
pos = self.intersectionPoint(point, pos)
shape.moveVertexBy(index, pos - point)
def boundedMoveShape(self, shape, pos):
if self.outOfPixmap(pos):
return False # No need to move
o1 = pos + self.offsets[0]
if self.outOfPixmap(o1):
pos -= QPointF(min(0, o1.x()), min(0, o1.y()))
o2 = pos + self.offsets[1]
if self.outOfPixmap(o2):
pos += QPointF(min(0,
self.pixmap.width() - o2.x()),
min(0,
self.pixmap.height() - o2.y()))
# The next line tracks the new position of the cursor
# relative to the shape, but also results in making it
# a bit "shaky" when nearing the border and allows it to
# go outside of the shape's area for some reason. XXX
#self.calculateOffsets(self.selectedShape, pos)
dp = pos - self.prevPoint
if dp:
shape.moveBy(dp)
self.prevPoint = pos
return True
return False
def deSelectShape(self):
if self.selectedShape:
self.selectedShape.selected = False
self.selectedShape = None
self.setHiding(False)
self.selectionChanged.emit(False)
self.update()
def deleteSelected(self):
if self.selectedShape:
shape = self.selectedShape
self.shapes.remove(self.selectedShape)
self.selectedShape = None
self.update()
return shape
def copySelectedShape(self):
if self.selectedShape:
shape = self.selectedShape.copy()
self.deSelectShape()
self.shapes.append(shape)
shape.selected = True
self.selectedShape = shape
self.boundedShiftShape(shape)
return shape
def boundedShiftShape(self, shape):
# Try to move in one direction, and if it fails in another.
# Give up if both fail.
point = shape[0]
offset = QPointF(2.0, 2.0)
self.calculateOffsets(shape, point)
self.prevPoint = point
if not self.boundedMoveShape(shape, point - offset):
self.boundedMoveShape(shape, point + offset)
def paintEvent(self, event):
if not self.pixmap:
return super(Canvas, self).paintEvent(event)
p = self._painter
p.begin(self)
p.setRenderHint(QPainter.Antialiasing)
p.setRenderHint(QPainter.HighQualityAntialiasing)
p.setRenderHint(QPainter.SmoothPixmapTransform)
p.scale(self.scale, self.scale)
p.translate(self.offsetToCenter())
p.drawPixmap(0, 0, self.pixmap)
Shape.scale = self.scale
for shape in self.shapes:
if (shape.selected
or not self._hideBackround) and self.isVisible(shape):
shape.fill = shape.selected or shape == self.hShape
shape.paint(p)
if self.current:
self.current.paint(p)
self.line.paint(p)
if self.selectedShapeCopy:
self.selectedShapeCopy.paint(p)
p.end()
def transformPos(self, point):
"""Convert from widget-logical coordinates to painter-logical coordinates."""
return point / self.scale - self.offsetToCenter()
def offsetToCenter(self):
s = self.scale
area = super(Canvas, self).size()
w, h = self.pixmap.width() * s, self.pixmap.height() * s
aw, ah = area.width(), area.height()
x = (aw - w) / (2 * s) if aw > w else 0
y = (ah - h) / (2 * s) if ah > h else 0
return QPointF(x, y)
def outOfPixmap(self, p):
w, h = self.pixmap.width(), self.pixmap.height()
return not (0 <= p.x() <= w and 0 <= p.y() <= h)
def finalise(self):
assert self.current
self.current.close()
self.shapes.append(self.current)
self.current = None
self.setHiding(False)
self.newShape.emit()
self.update()
def closeEnough(self, p1, p2):
#d = distance(p1 - p2)
#m = (p1-p2).manhattanLength()
#print "d %.2f, m %d, %.2f" % (d, m, d - m)
return distance(p1 - p2) < self.epsilon
def intersectionPoint(self, p1, p2):
# Cycle through each image edge in clockwise fashion,
# and find the one intersecting the current line segment.
# http://paulbourke.net/geometry/lineline2d/
size = self.pixmap.size()
points = [(0, 0), (size.width(), 0), (size.width(), size.height()),
(0, size.height())]
x1, y1 = p1.x(), p1.y()
x2, y2 = p2.x(), p2.y()
d, i, (x, y) = min(self.intersectingEdges((x1, y1), (x2, y2), points))
x3, y3 = points[i]
x4, y4 = points[(i + 1) % 4]
if (x, y) == (x1, y1):
# Handle cases where previous point is on one of the edges.
if x3 == x4:
return QPointF(x3, min(max(0, y2), max(y3, y4)))
else: # y3 == y4
return QPointF(min(max(0, x2), max(x3, x4)), y3)
return QPointF(x, y)
def intersectingEdges(self, (x1, y1), (x2, y2), points):
"""For each edge formed by `points', yield the intersection
with the line segment `(x1,y1) - (x2,y2)`, if it exists.
Also return the distance of `(x2,y2)' to the middle of the
edge along with its index, so that the one closest can be chosen."""
for i in xrange(4):
x3, y3 = points[i]
x4, y4 = points[(i + 1) % 4]
denom = (y4 - y3) * (x2 - x1) - (x4 - x3) * (y2 - y1)
nua = (x4 - x3) * (y1 - y3) - (y4 - y3) * (x1 - x3)
nub = (x2 - x1) * (y1 - y3) - (y2 - y1) * (x1 - x3)
if denom == 0:
# This covers two cases:
# nua == nub == 0: Coincident
# otherwise: Parallel
continue
ua, ub = nua / denom, nub / denom
if 0 <= ua <= 1 and 0 <= ub <= 1:
x = x1 + ua * (x2 - x1)
y = y1 + ua * (y2 - y1)
m = QPointF((x3 + x4) / 2, (y3 + y4) / 2)
d = distance(m - QPointF(x2, y2))
yield d, i, (x, y)
class Canvas(QWidget):
zoomRequest = pyqtSignal(int)
scrollRequest = pyqtSignal(int, int)
newShape = pyqtSignal()
selectionChanged = pyqtSignal(bool)
shapeMoved = pyqtSignal()
drawingPolygon = pyqtSignal(bool)
CREATE, EDIT = 0, 1
epsilon = 11.0
def __init__(self, *args, **kwargs):
super(Canvas, self).__init__(*args, **kwargs)
# Initialise local state.
self.mode = self.EDIT
self.shapes = []
self.current = None
self.selectedShape=None # save the selected shape here
self.selectedShapeCopy=None
self.lineColor = QColor(0, 0, 255)
self.line = Shape(line_color=self.lineColor)
self.prevPoint = QPointF()
self.offsets = QPointF(), QPointF()
self.scale = 1.0
self.pixmap = QPixmap()
self.visible = {}
self._hideBackround = False
self.hideBackround = False
self.hShape = None
self.hVertex = None
self._painter = QPainter()
self._cursor = CURSOR_DEFAULT
# Menus:
self.menus = (QMenu(), QMenu())
# Set widget options.
self.setMouseTracking(True)
self.setFocusPolicy(Qt.WheelFocus)
def enterEvent(self, ev):
self.overrideCursor(self._cursor)
def leaveEvent(self, ev):
self.restoreCursor()
def focusOutEvent(self, ev):
self.restoreCursor()
def isVisible(self, shape):
return self.visible.get(shape, True)
def drawing(self):
return self.mode == self.CREATE
def editing(self):
return self.mode == self.EDIT
def setEditing(self, value=True):
self.mode = self.EDIT if value else self.CREATE
if not value: # Create
self.unHighlight()
self.deSelectShape()
def unHighlight(self):
if self.hShape:
self.hShape.highlightClear()
self.hVertex = self.hShape = None
def selectedVertex(self):
return self.hVertex is not None
def mouseMoveEvent(self, ev):
"""Update line with last point and current coordinates."""
if PYQT5:
pos = self.transformPos(ev.pos())
else:
pos = self.transformPos(ev.posF())
self.restoreCursor()
# Polygon drawing.
if self.drawing():
self.overrideCursor(CURSOR_DRAW)
if self.current:
color = self.lineColor
if self.outOfPixmap(pos):
# Don't allow the user to draw outside the pixmap.
# Project the point to the pixmap's edges.
pos = self.intersectionPoint(self.current[-1], pos)
elif len(self.current) > 1 and self.closeEnough(pos, self.current[0]):
# Attract line to starting point and colorise to alert the user:
pos = self.current[0]
color = self.current.line_color
self.overrideCursor(CURSOR_POINT)
self.current.highlightVertex(0, Shape.NEAR_VERTEX)
self.line[1] = pos
self.line.line_color = color
self.repaint()
self.current.highlightClear()
return
# Polygon copy moving.
if Qt.RightButton & ev.buttons():
if self.selectedShapeCopy and self.prevPoint:
self.overrideCursor(CURSOR_MOVE)
self.boundedMoveShape(self.selectedShapeCopy, pos)
self.repaint()
elif self.selectedShape:
self.selectedShapeCopy = self.selectedShape.copy()
self.repaint()
return
# Polygon/Vertex moving.
if Qt.LeftButton & ev.buttons():
if self.selectedVertex():
self.boundedMoveVertex(pos)
self.shapeMoved.emit()
self.repaint()
elif self.selectedShape and self.prevPoint:
self.overrideCursor(CURSOR_MOVE)
self.boundedMoveShape(self.selectedShape, pos)
self.shapeMoved.emit()
self.repaint()
return
# Just hovering over the canvas, 2 posibilities:
# - Highlight shapes
# - Highlight vertex
# Update shape/vertex fill and tooltip value accordingly.
self.setToolTip("Image")
for shape in reversed([s for s in self.shapes if self.isVisible(s)]):
# Look for a nearby vertex to highlight. If that fails,
# check if we happen to be inside a shape.
index = shape.nearestVertex(pos, self.epsilon)
if index is not None:
if self.selectedVertex():
self.hShape.highlightClear()
self.hVertex, self.hShape = index, shape
shape.highlightVertex(index, shape.MOVE_VERTEX)
self.overrideCursor(CURSOR_POINT)
self.setToolTip("Click & drag to move point")
self.setStatusTip(self.toolTip())
self.update()
break
elif shape.containsPoint(pos):
if self.selectedVertex():
self.hShape.highlightClear()
self.hVertex, self.hShape = None, shape
self.setToolTip("Click & drag to move shape '%s'" % shape.label)
self.setStatusTip(self.toolTip())
self.overrideCursor(CURSOR_GRAB)
self.update()
break
else: # Nothing found, clear highlights, reset state.
if self.hShape:
self.hShape.highlightClear()
self.update()
self.hVertex, self.hShape = None, None
def mousePressEvent(self, ev):
if PYQT5:
pos = self.transformPos(ev.pos())
else:
pos = self.transformPos(ev.posF())
if ev.button() == Qt.LeftButton:
if self.drawing():
if self.current:
try:
self.current.addPoint(self.line[1])
except Exception as e:
print(e, file=sys.stderr)
return
self.line[0] = self.current[-1]
if self.current.isClosed():
self.finalise()
elif not self.outOfPixmap(pos):
self.current = Shape()
self.current.addPoint(pos)
self.line.points = [pos, pos]
self.setHiding()
self.drawingPolygon.emit(True)
self.update()
else:
self.selectShapePoint(pos)
self.prevPoint = pos
self.repaint()
elif ev.button() == Qt.RightButton and self.editing():
self.selectShapePoint(pos)
self.prevPoint = pos
self.repaint()
def mouseReleaseEvent(self, ev):
if ev.button() == Qt.RightButton:
menu = self.menus[bool(self.selectedShapeCopy)]
self.restoreCursor()
if not menu.exec_(self.mapToGlobal(ev.pos()))\
and self.selectedShapeCopy:
# Cancel the move by deleting the shadow copy.
self.selectedShapeCopy = None
self.repaint()
elif ev.button() == Qt.LeftButton and self.selectedShape:
self.overrideCursor(CURSOR_GRAB)
def endMove(self, copy=False):
assert self.selectedShape and self.selectedShapeCopy
shape = self.selectedShapeCopy
#del shape.fill_color
#del shape.line_color
if copy:
self.shapes.append(shape)
self.selectedShape.selected = False
self.selectedShape = shape
self.repaint()
else:
shape.label = self.selectedShape.label
self.deleteSelected()
self.shapes.append(shape)
self.selectedShapeCopy = None
def hideBackroundShapes(self, value):
self.hideBackround = value
if self.selectedShape:
# Only hide other shapes if there is a current selection.
# Otherwise the user will not be able to select a shape.
self.setHiding(True)
self.repaint()
def setHiding(self, enable=True):
self._hideBackround = self.hideBackround if enable else False
def canCloseShape(self):
return self.drawing() and self.current and len(self.current) > 2
def mouseDoubleClickEvent(self, ev):
# We need at least 4 points here, since the mousePress handler
# adds an extra one before this handler is called.
if self.canCloseShape() and len(self.current) > 3:
self.current.popPoint()
self.finalise()
def selectShape(self, shape):
self.deSelectShape()
shape.selected = True
self.selectedShape = shape
self.setHiding()
self.selectionChanged.emit(True)
self.update()
def selectShapePoint(self, point):
"""Select the first shape created which contains this point."""
self.deSelectShape()
if self.selectedVertex(): # A vertex is marked for selection.
index, shape = self.hVertex, self.hShape
shape.highlightVertex(index, shape.MOVE_VERTEX)
return
for shape in reversed(self.shapes):
if self.isVisible(shape) and shape.containsPoint(point):
shape.selected = True
self.selectedShape = shape
self.calculateOffsets(shape, point)
self.setHiding()
self.selectionChanged.emit(True)
return
def calculateOffsets(self, shape, point):
rect = shape.boundingRect()
x1 = rect.x() - point.x()
y1 = rect.y() - point.y()
x2 = (rect.x() + rect.width()) - point.x()
y2 = (rect.y() + rect.height()) - point.y()
self.offsets = QPointF(x1, y1), QPointF(x2, y2)
def boundedMoveVertex(self, pos):
index, shape = self.hVertex, self.hShape
point = shape[index]
if self.outOfPixmap(pos):
pos = self.intersectionPoint(point, pos)
shape.moveVertexBy(index, pos - point)
def boundedMoveShape(self, shape, pos):
if self.outOfPixmap(pos):
return False # No need to move
o1 = pos + self.offsets[0]
if self.outOfPixmap(o1):
pos -= QPointF(min(0, o1.x()), min(0, o1.y()))
o2 = pos + self.offsets[1]
if self.outOfPixmap(o2):
pos += QPointF(min(0, self.pixmap.width() - o2.x()),
min(0, self.pixmap.height()- o2.y()))
# The next line tracks the new position of the cursor
# relative to the shape, but also results in making it
# a bit "shaky" when nearing the border and allows it to
# go outside of the shape's area for some reason. XXX
#self.calculateOffsets(self.selectedShape, pos)
dp = pos - self.prevPoint
if dp:
shape.moveBy(dp)
self.prevPoint = pos
return True
return False
def deSelectShape(self):
if self.selectedShape:
self.selectedShape.selected = False
self.selectedShape = None
self.setHiding(False)
self.selectionChanged.emit(False)
self.update()
def deleteSelected(self):
if self.selectedShape:
shape = self.selectedShape
self.shapes.remove(self.selectedShape)
self.selectedShape = None
self.update()
return shape
def copySelectedShape(self):
if self.selectedShape:
shape = self.selectedShape.copy()
self.deSelectShape()
self.shapes.append(shape)
shape.selected = True
self.selectedShape = shape
self.boundedShiftShape(shape)
return shape
def boundedShiftShape(self, shape):
# Try to move in one direction, and if it fails in another.
# Give up if both fail.
point = shape[0]
offset = QPointF(2.0, 2.0)
self.calculateOffsets(shape, point)
self.prevPoint = point
if not self.boundedMoveShape(shape, point - offset):
self.boundedMoveShape(shape, point + offset)
def paintEvent(self, event):
if not self.pixmap:
return super(Canvas, self).paintEvent(event)
p = self._painter
p.begin(self)
p.setRenderHint(QPainter.Antialiasing)
p.setRenderHint(QPainter.HighQualityAntialiasing)
p.setRenderHint(QPainter.SmoothPixmapTransform)
p.scale(self.scale, self.scale)
p.translate(self.offsetToCenter())
p.drawPixmap(0, 0, self.pixmap)
Shape.scale = self.scale
for shape in self.shapes:
if (shape.selected or not self._hideBackround) and self.isVisible(shape):
shape.fill = shape.selected or shape == self.hShape
shape.paint(p)
if self.current:
self.current.paint(p)
self.line.paint(p)
if self.selectedShapeCopy:
self.selectedShapeCopy.paint(p)
p.end()
def transformPos(self, point):
"""Convert from widget-logical coordinates to painter-logical coordinates."""
return point / self.scale - self.offsetToCenter()
def offsetToCenter(self):
s = self.scale
area = super(Canvas, self).size()
w, h = self.pixmap.width() * s, self.pixmap.height() * s
aw, ah = area.width(), area.height()
x = (aw-w)/(2*s) if aw > w else 0
y = (ah-h)/(2*s) if ah > h else 0
return QPointF(x, y)
def outOfPixmap(self, p):
w, h = self.pixmap.width(), self.pixmap.height()
return not (0 <= p.x() <= w and 0 <= p.y() <= h)
def finalise(self):
assert self.current
self.current.close()
self.shapes.append(self.current)
self.current = None
self.setHiding(False)
self.newShape.emit()
self.update()
def closeEnough(self, p1, p2):
#d = distance(p1 - p2)
#m = (p1-p2).manhattanLength()
#print "d %.2f, m %d, %.2f" % (d, m, d - m)
return distance(p1 - p2) < self.epsilon
def intersectionPoint(self, p1, p2):
# Cycle through each image edge in clockwise fashion,
# and find the one intersecting the current line segment.
# http://paulbourke.net/geometry/lineline2d/
size = self.pixmap.size()
points = [(0,0),
(size.width(), 0),
(size.width(), size.height()),
(0, size.height())]
x1, y1 = p1.x(), p1.y()
x2, y2 = p2.x(), p2.y()
d, i, (x, y) = min(self.intersectingEdges((x1, y1), (x2, y2), points))
x3, y3 = points[i]
x4, y4 = points[(i+1)%4]
if (x, y) == (x1, y1):
# Handle cases where previous point is on one of the edges.
if x3 == x4:
return QPointF(x3, min(max(0, y2), max(y3, y4)))
else: # y3 == y4
return QPointF(min(max(0, x2), max(x3, x4)), y3)
return QPointF(x, y)
def intersectingEdges(self, point1, point2, points):
"""For each edge formed by `points', yield the intersection
with the line segment `(x1,y1) - (x2,y2)`, if it exists.
Also return the distance of `(x2,y2)' to the middle of the
edge along with its index, so that the one closest can be chosen."""
(x1, y1) = point1
(x2, y2) = point2
for i in range(4):
x3, y3 = points[i]
x4, y4 = points[(i+1) % 4]
denom = (y4-y3) * (x2 - x1) - (x4 - x3) * (y2 - y1)
nua = (x4-x3) * (y1-y3) - (y4-y3) * (x1-x3)
nub = (x2-x1) * (y1-y3) - (y2-y1) * (x1-x3)
if denom == 0:
# This covers two cases:
# nua == nub == 0: Coincident
# otherwise: Parallel
continue
ua, ub = nua / denom, nub / denom
if 0 <= ua <= 1 and 0 <= ub <= 1:
x = x1 + ua * (x2 - x1)
y = y1 + ua * (y2 - y1)
m = QPointF((x3 + x4)/2, (y3 + y4)/2)
d = distance(m - QPointF(x2, y2))
yield d, i, (x, y)
# These two, along with a call to adjustSize are required for the
# scroll area.
def sizeHint(self):
return self.minimumSizeHint()
def minimumSizeHint(self):
if self.pixmap:
return self.scale * self.pixmap.size()
return super(Canvas, self).minimumSizeHint()
def wheelEvent(self, ev):
if PYQT5:
mods = ev.modifiers()
delta = ev.pixelDelta()
if Qt.ControlModifier == int(mods): # with Ctrl/Command key
# zoom
self.zoomRequest.emit(delta.y())
else:
# scroll
self.scrollRequest.emit(delta.x(), Qt.Horizontal)
self.scrollRequest.emit(delta.y(), Qt.Vertical)
else:
if ev.orientation() == Qt.Vertical:
mods = ev.modifiers()
if Qt.ControlModifier == int(mods): # with Ctrl/Command key
self.zoomRequest.emit(ev.delta())
else:
self.scrollRequest.emit(ev.delta(),
Qt.Horizontal if (Qt.ShiftModifier == int(mods))\
else Qt.Vertical)
else:
self.scrollRequest.emit(ev.delta(), Qt.Horizontal)
ev.accept()
def keyPressEvent(self, ev):
key = ev.key()
if key == Qt.Key_Escape and self.current:
self.current = None
self.drawingPolygon.emit(False)
self.update()
elif key == Qt.Key_Return and self.canCloseShape():
self.finalise()
def setLastLabel(self, text):
assert text
self.shapes[-1].label = text
return self.shapes[-1]
def undoLastLine(self):
assert self.shapes
self.current = self.shapes.pop()
self.current.setOpen()
self.line.points = [self.current[-1], self.current[0]]
self.drawingPolygon.emit(True)
def loadPixmap(self, pixmap):
self.pixmap = pixmap
self.shapes = []
self.repaint()
def loadShapes(self, shapes):
self.shapes = list(shapes)
self.current = None
self.repaint()
def setShapeVisible(self, shape, value):
self.visible[shape] = value
self.repaint()
def overrideCursor(self, cursor):
self.restoreCursor()
self._cursor = cursor
QApplication.setOverrideCursor(cursor)
def restoreCursor(self):
QApplication.restoreOverrideCursor()
def resetState(self):
self.restoreCursor()
self.pixmap = None
self.update()
class Canvas(QtWidgets.QWidget): # 显示和绘制图片的控件
zoomRequest = QtCore.Signal(int, QtCore.QPoint)
scrollRequest = QtCore.Signal(int, int)
newShape = QtCore.Signal()
selectionChanged = QtCore.Signal(list) # 选择改变的信号函数
shapeMoved = QtCore.Signal() # shape改变的信号
drawingPolygon = QtCore.Signal(bool) # 绘制多边形的信号
edgeSelected = QtCore.Signal(bool, object) # 选择边的信号
vertexSelected = QtCore.Signal(bool) # 选择顶点的信号
CREATE, EDIT = 0, 1 # 两种模式，绘制模式和编辑模式
# polygon, rectangle, line, or point
_createMode = 'polygon' # 绘制模式默认为多边形
_fill_drawing = False # shape填充默认为false
def __init__(self, *args, **kwargs):
self.epsilon = kwargs.pop('epsilon', 10.0) # 把字典中的epsilon删除，如果此键不存在则返回10.0。存在则删除此键的键值对，并返回键对应的值
self.double_click = kwargs.pop('double_click', 'close') #双击
if self.double_click not in [None, 'close']: #如果双击 的值不是None也不是关闭
raise ValueError(
'Unexpected value for double_click event: {}'
.format(self.double_click) # 非期望值
)
super(Canvas, self).__init__(*args, **kwargs)
# Initialise local state.
self.mode = self.EDIT # 模式选择
self.shapes = [] # shapes
self.shapesBackups = [] # shapes backup
self.current = None # 当前的什么 None值
self.selectedShapes = [] # save the selected shapes here
self.selectedShapesCopy = [] # 上一个成员的copy
# self.line represents:
# - createMode == 'polygon': edge from last point to current
# - createMode == 'rectangle': diagonal line of the rectangle
# - createMode == 'line': the line
# - createMode == 'point': the point
self.line = Shape() # 一个Shape类对象，用于在图像绘制多边形
self.prevPoint = QtCore.QPoint() # baocun
self.prevMovePoint = QtCore.QPoint() # 保存当前点位置
self.offsets = QtCore.QPoint(), QtCore.QPoint() #偏移是两个空点，出事为0
self.scale = 1.0 #放缩比例
self.pixmap = QtGui.QPixmap() # pixmap绘图设备的图像显示
self.visible = {} # 可见的
self._hideBackround = False # 是否隐藏背景
self.hideBackround = False
self.hShape = None # 当前shape？
self.prevhShape = None # 上一个shape
self.hVertex = None #当前顶点
self.prevhVertex = None # 上一个顶点
self.hEdge = None # 当前边
self.prevhEdge = None # 上一条边
self.movingShape = False # 移动形状
self._painter = QtGui.QPainter() # 绘制控件 在父类上绘制
self._cursor = CURSOR_DEFAULT #光标样式设置
# Menus:
# 0: right-click without selection and dragging of shapes
# 1: right-click with selection and dragging of shapes
self.menus = (QtWidgets.QMenu(), QtWidgets.QMenu()) #0:右键没有选择 1:拖拽形状
# Set widget options.
self.setMouseTracking(True) # 设置部件选择 鼠标跟踪设为真（此时可以重载几个鼠标的槽函数），参数为鼠标的信号
self.setFocusPolicy(QtCore.Qt.WheelFocus) # 设置焦点策略 轮子焦点
def fillDrawing(self): # 是否填充
return self._fill_drawing
def setFillDrawing(self, value): # 改变填充方式
self._fill_drawing = value
@property
def createMode(self):
return self._createMode
@createMode.setter
def createMode(self, value):
if value not in ['polygon', 'rectangle', 'circle',
'line', 'point', 'linestrip']:
raise ValueError('Unsupported createMode: %s' % value)
self._createMode = value
def storeShapes(self): ## 完成一个标注，将shape保存到shapes里边
shapesBackup = []
for shape in self.shapes:
shapesBackup.append(shape.copy()) # 把所有的shapes保存到这个里面
if len(self.shapesBackups) >= 10: # 如果
self.shapesBackups = self.shapesBackups[-9:]
self.shapesBackups.append(shapesBackup)
@property
def isShapeRestorable(self):
if len(self.shapesBackups) < 2: ### 是否可保存
return False
return True
def restoreShape(self): # 重置（恢复）shape
if not self.isShapeRestorable: # 如果不可存
return
self.shapesBackups.pop() # latest # 列表弹出末尾元素
shapesBackup = self.shapesBackups.pop() # 形状支持
self.shapes = shapesBackup # shapes就等于这个backup
self.selectedShapes = [] # 保存选择的多个shape
for shape in self.shapes: # 对于支持的形状shapes，默认选择shape的标志全部设置为False
shape.selected = False # 设置为空
self.repaint() # 重绘
def enterEvent(self, ev): # 鼠标进入控件事件
self.overrideCursor(self._cursor) # 返回当前鼠标形状的QCursor 对象
def leaveEvent(self, ev): # 鼠标离开控件事件
self.unHighlight() # 不在高亮
self.restoreCursor() # 取消全局鼠标形状设置
def focusOutEvent(self, ev): #
self.restoreCursor() # 取消全局鼠标形状设置
def isVisible(self, shape):
return self.visible.get(shape, True)
def drawing(self): # 返回bool 是否绘制状态
return self.mode == self.CREATE
def editing(self): # 编辑状态
return self.mode == self.EDIT
def setEditing(self, value=True): # 设置编辑状态
self.mode = self.EDIT if value else self.CREATE
if not value: # Create
self.unHighlight()
self.deSelectShape()
def unHighlight(self): # 取消高亮
if self.hShape:
self.hShape.highlightClear()
self.update()
self.prevhShape = self.hShape
self.prevhVertex = self.hVertex
self.prevhEdge = self.hEdge
self.hShape = self.hVertex = self.hEdge = None
def selectedVertex(self): # 顶点
return self.hVertex is not None
def mouseMoveEvent(self, ev): # 鼠标移动检测， 每次移动都更新点到self.prevMovePoint
"""Update line with last point and current coordinates."""
try:
if QT5:
pos = self.transformPos(ev.localPos()) # 获取坐标
else:
pos = self.transformPos(ev.posF())
except AttributeError:
return
self.prevMovePoint = pos
self.restoreCursor()
# Polygon drawing.
if self.drawing():
self.line.shape_type = self.createMode
self.overrideCursor(CURSOR_DRAW) # 重置光标
if not self.current:
return
if self.outOfPixmap(pos): # 如果坐标在pixmap外 不让用户在pixmap外部绘制
# Don't allow the user to draw outside the pixmap.
# Project the point to the pixmap's edges.
pos = self.intersectionPoint(self.current[-1], pos) # 将点投影到pixmap控件的边缘
elif len(self.current) > 1 and self.createMode == 'polygon' and\
self.closeEnough(pos, self.current[0]): # 否则，如果当前shape的点个数大于1 并且模式为绘制多边形 并且足够关闭(pos，shape的第一个元素)？
# Shape类对象有下标操作？(设定__getitem__函数即可)
# Attract line to starting point and
# colorise to alert the user.
pos = self.current[0] # 提取line到起始点并且用彩色点提醒用户
self.overrideCursor(CURSOR_POINT) # 更改光标样式为点
self.current.highlightVertex(0, Shape.NEAR_VERTEX) # 高亮顶点
if self.createMode in ['polygon', 'linestrip']: # 如果模式为多边形和折线
self.line[0] = self.current[-1] # line[0]为当前shape的最后一个点的元素
self.line[1] = pos # line[1]为当前元素
elif self.createMode == 'rectangle': # 如果绘制矩形
self.line.points = [self.current[0], pos] # line.points为第一个点和当前点 su
self.line.close() # 把点保存进矩阵并且加相关信息（类别名）
elif self.createMode == 'circle': # 圆形
self.line.points = [self.current[0], pos] # 添加两点
self.line.shape_type = "circle" # 形状设置为圆
elif self.createMode == 'line': # 线段
self.line.points = [self.current[0], pos] # 添加两点
self.line.close() # 关闭保存
elif self.createMode == 'point': # 点
self.line.points = [self.current[0]] # 添加点
self.line.close() # 关闭保存
self.repaint() # 重绘
self.current.highlightClear() # 高亮清除
return
# Polygon copy moving.
if QtCore.Qt.RightButton & ev.buttons(): # 移动
if self.selectedShapesCopy and self.prevPoint: # 复制
self.overrideCursor(CURSOR_MOVE) # 光标改变
self.boundedMoveShapes(self.selectedShapesCopy, pos) # 框处移动
self.repaint() # 重绘
elif self.selectedShapes: # 选择形状
self.selectedShapesCopy = \
[s.copy() for s in self.selectedShapes] # 形状
self.repaint()
return
# Polygon/Vertex moving.
if QtCore.Qt.LeftButton & ev.buttons(): # 多边形移动
if self.selectedVertex():
self.boundedMoveVertex(pos)
self.repaint()
self.movingShape = True
elif self.selectedShapes and self.prevPoint:
self.overrideCursor(CURSOR_MOVE)
self.boundedMoveShapes(self.selectedShapes, pos)
self.repaint()
self.movingShape = True
return
# Just hovering over the canvas, 2 possibilities:
# - Highlight shapes
# - Highlight vertex
# Update shape/vertex fill and tooltip value accordingly.
self.setToolTip(self.tr("Image")) # 设置提示
for shape in reversed([s for s in self.shapes if self.isVisible(s)]): # self.shapes保存的，如果shape是可见的，便执行
# Look for a nearby vertex to highlight. If that fails,
# check if we happen to be inside a shape.
index = shape.nearestVertex(pos, self.epsilon / self.scale) # 查找最近顶点
index_edge = shape.nearestEdge(pos, self.epsilon / self.scale) # 最近边
if index is not None: # 如果index
if self.selectedVertex():
self.hShape.highlightClear()
self.prevhVertex = self.hVertex = index # 更新形状 顶点 边
self.prevhShape = self.hShape = shape
self.prevhEdge = self.hEdge = index_edge
shape.highlightVertex(index, shape.MOVE_VERTEX) # 高亮顶点
self.overrideCursor(CURSOR_POINT) # 光标样式
self.setToolTip(self.tr("Click & drag to move point")) # 点击或拖拽移动点
self.setStatusTip(self.toolTip()) # 设置状态提示
self.update() # 更新窗口部件，速度比repaint更快，闪烁更少
break
elif shape.containsPoint(pos): # 如果此形状shape里包含当前点
if self.selectedVertex():
self.hShape.highlightClear()
self.prevhVertex = self.hVertex
self.hVertex = None
self.prevhShape = self.hShape = shape
self.prevhEdge = self.hEdge = index_edge
self.setToolTip(
self.tr("Click & drag to move shape '%s'") % shape.label)
self.setStatusTip(self.toolTip())
self.overrideCursor(CURSOR_GRAB)
self.update()
break
else: # Nothing found, clear highlights, reset state.
self.unHighlight()
self.edgeSelected.emit(self.hEdge is not None, self.hShape)
self.vertexSelected.emit(self.hVertex is not None)
def addPointToEdge(self):# 添加点到边
shape = self.prevhShape # 上一个形状
index = self.prevhEdge # 上一条边的index
point = self.prevMovePoint # 上一个移动点
if shape is None or index is None or point is None: #形状不空 或 index 或 点也存在
return
shape.insertPoint(index, point) # 插入点
shape.highlightVertex(index, shape.MOVE_VERTEX)
self.hShape = shape # 当前形状
self.hVertex = index # index
self.hEdge = None # 当前边重置
self.movingShape = True #一同shape设为True
def removeSelectedPoint(self): # 删除选择的点 这些都会导致shape内点的变化 都要在这里添加新shape的修改
shape = self.prevhShape
point = self.prevMovePoint
if shape is None or point is None:
return
index = shape.nearestVertex(point, self.epsilon)
shape.removePoint(index) # 最近点移除
# shape.highlightVertex(index, shape.MOVE_VERTEX)
self.hShape = shape
self.hVertex = None
self.hEdge = None
self.movingShape = True # Save changes
def mousePressEvent(self, ev):
if QT5:
pos = self.transformPos(ev.localPos()) #### 获取坐标 两个类型都是<class 'PyQt5.QtCore.QPointF'> 此函数用于变换坐标到对应控件？
t_str = time.strftime('%m-%d %H:%M:%S', time.localtime(time.time())) ## 添加记录时间 汉化文件行数变化
else:
pos = self.transformPos(ev.posF())
if ev.button() == QtCore.Qt.LeftButton: # 左键则绘制， 一边添加
if self.drawing():
if self.current: # 如果当前的shape不为空（points内有点）
# Add point to existing shape.
if self.createMode == 'polygon':
self.current.addPoint(self.line[1]) # 添加点 此时pointsNew也变化
self.line[0] = self.current[-1] # 等于最后一个点line[0]
if self.current.isClosed(): # 通过此函数找到了self.current的类别，即Shape
self.finalise() # 敲定
elif self.createMode in ['rectangle', 'circle', 'line']:
assert len(self.current.points) == 1
self.current.points = self.line.points
self.finalise()
elif self.createMode == 'linestrip':
self.current.addPoint(self.line[1])
self.line[0] = self.current[-1]
if int(ev.modifiers()) == QtCore.Qt.ControlModifier:
self.finalise()
elif not self.outOfPixmap(pos):
# Create new shape.
self.current = Shape(shape_type=self.createMode)
self.current.addPoint(pos) # 这里添加的两个坐标的点了 看下位置 加入哪里的
if self.createMode == 'point':
self.finalise()
else:
if self.createMode == 'circle':
self.current.shape_type = 'circle' # 圆
self.line.points = [pos, pos] # 两点
self.setHiding() #
self.drawingPolygon.emit(True) # 绘制
self.update() # 刷新
else: # 没有点，起始
group_mode = (int(ev.modifiers()) == QtCore.Qt.ControlModifier) # 鼠标信息的修改器 与 控制器修改器
self.selectShapePoint(pos, multiple_selection_mode=group_mode) # 选择点
self.prevPoint = pos # 更新点
self.repaint() # 重绘
elif ev.button() == QtCore.Qt.RightButton and self.editing(): # 右键
group_mode = (int(ev.modifiers()) == QtCore.Qt.ControlModifier)
self.selectShapePoint(pos, multiple_selection_mode=group_mode)
self.prevPoint = pos
self.repaint()
def mouseReleaseEvent(self, ev): # 鼠标右键释放 编辑状态
if ev.button() == QtCore.Qt.RightButton:
menu = self.menus[len(self.selectedShapesCopy) > 0]
self.restoreCursor()
if not menu.exec_(self.mapToGlobal(ev.pos())) \
and self.selectedShapesCopy:
# Cancel the move by deleting the shadow copy.
self.selectedShapesCopy = []
self.repaint()
elif ev.button() == QtCore.Qt.LeftButton and self.selectedShapes:
self.overrideCursor(CURSOR_GRAB)
if self.movingShape and self.hShape:
index = self.shapes.index(self.hShape)
if (self.shapesBackups[-1][index].points !=
self.shapes[index].points):
self.storeShapes()
self.shapeMoved.emit()
self.movingShape = False
def endMove(self, copy): # 结束移动
assert self.selectedShapes and self.selectedShapesCopy
assert len(self.selectedShapesCopy) == len(self.selectedShapes)
if copy:
for i, shape in enumerate(self.selectedShapesCopy):
self.shapes.append(shape)
self.selectedShapes[i].selected = False
self.selectedShapes[i] = shape
else:
for i, shape in enumerate(self.selectedShapesCopy):
self.selectedShapes[i].points = shape.points
self.selectedShapesCopy = []
self.repaint()
self.storeShapes()
return True
def hideBackroundShapes(self, value): # 隐藏背景
self.hideBackround = value
if self.selectedShapes:
# Only hide other shapes if there is a current selection.
# Otherwise the user will not be able to select a shape.
self.setHiding(True)
self.repaint()
def setHiding(self, enable=True):
self._hideBackround = self.hideBackround if enable else False
def canCloseShape(self):
return self.drawing() and self.current and len(self.current) > 2
def mouseDoubleClickEvent(self, ev): # 鼠标双击事件
# We need at least 4 points here, since the mousePress handler
# adds an extra one before this handler is called.
if (self.double_click == 'close' and self.canCloseShape() and
len(self.current) > 3): # 双击检测就关闭的标志打开，并且可关闭shape的标志打开，并且当前的shape的点的个数大于3（重载__len__()方法）
self.current.popPoint() # 由此可见current类实际是Shape类 用来代表当前shape 弹出点
self.finalise()
def selectShapes(self, shapes):
self.setHiding()
self.selectionChanged.emit(shapes)
self.update()
def selectShapePoint(self, point, multiple_selection_mode):
"""Select the first shape created which contains this point."""
if self.selectedVertex(): # A vertex is marked for selection.
index, shape = self.hVertex, self.hShape
shape.highlightVertex(index, shape.MOVE_VERTEX)
else:
for shape in reversed(self.shapes):
if self.isVisible(shape) and shape.containsPoint(point):
self.calculateOffsets(shape, point)
self.setHiding()
if multiple_selection_mode:
if shape not in self.selectedShapes:
self.selectionChanged.emit(
self.selectedShapes + [shape])
else:
self.selectionChanged.emit([shape])
return
self.deSelectShape()
def calculateOffsets(self, shape, point):
rect = shape.boundingRect()
x1 = rect.x() - point.x()
y1 = rect.y() - point.y()
x2 = (rect.x() + rect.width() - 1) - point.x()
y2 = (rect.y() + rect.height() - 1) - point.y()
self.offsets = QtCore.QPoint(x1, y1), QtCore.QPoint(x2, y2)
def boundedMoveVertex(self, pos):
index, shape = self.hVertex, self.hShape
point = shape[index]
if self.outOfPixmap(pos):
pos = self.intersectionPoint(point, pos)
shape.moveVertexBy(index, pos - point)
def boundedMoveShapes(self, shapes, pos):
if self.outOfPixmap(pos):
return False # No need to move
o1 = pos + self.offsets[0]
if self.outOfPixmap(o1):
pos -= QtCore.QPoint(min(0, o1.x()), min(0, o1.y()))
o2 = pos + self.offsets[1]
if self.outOfPixmap(o2):
pos += QtCore.QPoint(min(0, self.pixmap.width() - o2.x()),
min(0, self.pixmap.height() - o2.y()))
# XXX: The next line tracks the new position of the cursor
# relative to the shape, but also results in making it
# a bit "shaky" when nearing the border and allows it to
# go outside of the shape's area for some reason.
# self.calculateOffsets(self.selectedShapes, pos)
dp = pos - self.prevPoint
if dp:
for shape in shapes:
shape.moveBy(dp)
self.prevPoint = pos
return True
return False
def deSelectShape(self):
if self.selectedShapes:
self.setHiding(False)
self.selectionChanged.emit([])
self.update()
def deleteSelected(self):
deleted_shapes = []
if self.selectedShapes:
for shape in self.selectedShapes:
self.shapes.remove(shape)
deleted_shapes.append(shape)
self.storeShapes()
self.selectedShapes = []
self.update()
return deleted_shapes
def copySelectedShapes(self):
if self.selectedShapes:
self.selectedShapesCopy = [s.copy() for s in self.selectedShapes]
self.boundedShiftShapes(self.selectedShapesCopy)
self.endMove(copy=True)
return self.selectedShapes
def boundedShiftShapes(self, shapes):
# Try to move in one direction, and if it fails in another.
# Give up if both fail.
point = shapes[0][0]
offset = QtCore.QPoint(2.0, 2.0)
self.offsets = QtCore.QPoint(), QtCore.QPoint()
self.prevPoint = point
if not self.boundedMoveShapes(shapes, point - offset):
self.boundedMoveShapes(shapes, point + offset)
def paintEvent(self, event): # 绘制事件
if not self.pixmap:
return super(Canvas, self).paintEvent(event)
p = self._painter
p.begin(self) # self？
p.setRenderHint(QtGui.QPainter.Antialiasing) # 设置样式
p.setRenderHint(QtGui.QPainter.HighQualityAntialiasing)
p.setRenderHint(QtGui.QPainter.SmoothPixmapTransform)
p.scale(self.scale, self.scale)
p.translate(self.offsetToCenter()) # 翻译
p.drawPixmap(0, 0, self.pixmap) # 绘制
Shape.scale = self.scale
for shape in self.shapes: # 绘制
if (shape.selected or not self._hideBackround) and \
self.isVisible(shape):
shape.fill = shape.selected or shape == self.hShape
shape.paint(p)
if self.current:
self.current.paint(p)
self.line.paint(p)
if self.selectedShapesCopy:
for s in self.selectedShapesCopy:
s.paint(p)
if (self.fillDrawing() and self.createMode == 'polygon' and
self.current is not None and len(self.current.points) >= 2):
drawing_shape = self.current.copy()
drawing_shape.addPoint(self.line[1])
drawing_shape.fill = True
drawing_shape.fill_color.setAlpha(64)
drawing_shape.paint(p)
p.end()
def transformPos(self, point): # 坐标变换函数 根据大小做变换 当前坐标为canvas控件
"""Convert from widget-logical coordinates to painter-logical ones."""
return point / self.scale - self.offsetToCenter() # 返回point除以放缩比例减去当前偏离中心的位置
def offsetToCenter(self):
s = self.scale
area = super(Canvas, self).size()
w, h = self.pixmap.width() * s, self.pixmap.height() * s
aw, ah = area.width(), area.height()
x = (aw - w) / (2 * s) if aw > w else 0
y = (ah - h) / (2 * s) if ah > h else 0
return QtCore.QPoint(x, y) # 返回中心点类 初始化函数为QtCore.QPoint(x, y)
def outOfPixmap(self, p): # 在pixmap之外
w, h = self.pixmap.width(), self.pixmap.height()
return not (0 <= p.x() <= w - 1 and 0 <= p.y() <= h - 1)
def finalise(self): # 敲定（确定方案）
assert self.current
self.current.close() # Shape类方法，设定close标志位True
self.shapes.append(self.current) # shapes添加当前shape 所以更改的保存shape的方法 把data里面的shapes里的shape里的points改成pointsNew
self.storeShapes() # 重置shapes
self.current = None # 当前设定为空
self.setHiding(False) # 隐藏设为False
self.newShape.emit() # 新形状
self.update() # 更新
def closeEnough(self, p1, p2):
# d = distance(p1 - p2)
# m = (p1-p2).manhattanLength()
# print "d %.2f, m %d, %.2f" % (d, m, d - m)
# divide by scale to allow more precision when zoomed in
return labelme.utils.distance(p1 - p2) < (self.epsilon / self.scale)
def intersectionPoint(self, p1, p2): # 交集点
# Cycle through each image edge in clockwise fashion,
# and find the one intersecting the current line segment.
# http://paulbourke.net/geometry/lineline2d/
# 顺时针循环通过每个图像边缘，并找到与当前线段相交的线段。
size = self.pixmap.size()
points = [(0, 0),
(size.width() - 1, 0),
(size.width() - 1, size.height() - 1),
(0, size.height() - 1)]
# x1, y1 should be in the pixmap, x2, y2 should be out of the pixmap
x1 = min(max(p1.x(), 0), size.width() - 1)
y1 = min(max(p1.y(), 0), size.height() - 1)
x2, y2 = p2.x(), p2.y()
d, i, (x, y) = min(self.intersectingEdges((x1, y1), (x2, y2), points))
x3, y3 = points[i]
x4, y4 = points[(i + 1) % 4]
if (x, y) == (x1, y1):
# Handle cases where previous point is on one of the edges.
if x3 == x4:
return QtCore.QPoint(x3, min(max(0, y2), max(y3, y4)))
else: # y3 == y4
return QtCore.QPoint(min(max(0, x2), max(x3, x4)), y3)
return QtCore.QPoint(x, y)
def intersectingEdges(self, point1, point2, points): # 找出交集边 每条由点形成的边，返回边长的一般 用来选择最近的边
"""Find intersecting edges.
For each edge formed by `points', yield the intersection
with the line segment `(x1,y1) - (x2,y2)`, if it exists.
Also return the distance of `(x2,y2)' to the middle of the
edge along with its index, so that the one closest can be chosen.
"""
(x1, y1) = point1 #
(x2, y2) = point2
for i in range(4):
x3, y3 = points[i] # 这是Qt点类的列表吗？还能这么用？
x4, y4 = points[(i + 1) % 4]
denom = (y4 - y3) * (x2 - x1) - (x4 - x3) * (y2 - y1)
nua = (x4 - x3) * (y1 - y3) - (y4 - y3) * (x1 - x3)
nub = (x2 - x1) * (y1 - y3) - (y2 - y1) * (x1 - x3)
if denom == 0:
# This covers two cases:
# nua == nub == 0: Coincident
# otherwise: Parallel
continue
ua, ub = nua / denom, nub / denom
if 0 <= ua <= 1 and 0 <= ub <= 1:
x = x1 + ua * (x2 - x1)
y = y1 + ua * (y2 - y1)
m = QtCore.QPoint((x3 + x4) / 2, (y3 + y4) / 2)
d = labelme.utils.distance(m - QtCore.QPoint(x2, y2))
yield d, i, (x, y)
# These two, along with a call to adjustSize are required for the
# scroll area.
def sizeHint(self):
return self.minimumSizeHint()
def minimumSizeHint(self):
if self.pixmap:
return self.scale * self.pixmap.size()
return super(Canvas, self).minimumSizeHint()
def wheelEvent(self, ev):
if QT5:
mods = ev.modifiers()
delta = ev.angleDelta()
if QtCore.Qt.ControlModifier == int(mods):
# with Ctrl/Command key
# zoom
self.zoomRequest.emit(delta.y(), ev.pos())
else:
# scroll
self.scrollRequest.emit(delta.x(), QtCore.Qt.Horizontal)
self.scrollRequest.emit(delta.y(), QtCore.Qt.Vertical)
else:
if ev.orientation() == QtCore.Qt.Vertical:
mods = ev.modifiers()
if QtCore.Qt.ControlModifier == int(mods):
# with Ctrl/Command key
self.zoomRequest.emit(ev.delta(), ev.pos())
else:
self.scrollRequest.emit(
ev.delta(),
QtCore.Qt.Horizontal
if (QtCore.Qt.ShiftModifier == int(mods))
else QtCore.Qt.Vertical)
else:
self.scrollRequest.emit(ev.delta(), QtCore.Qt.Horizontal)
ev.accept()
def keyPressEvent(self, ev): # 键盘事件
key = ev.key()
if key == QtCore.Qt.Key_Escape and self.current: # 如果按下的是Esc键 并且当前shape有点存在
self.current = None # 清空current
self.drawingPolygon.emit(False) # 绘制退出
self.update() #
elif key == QtCore.Qt.Key_Return and self.canCloseShape():
self.finalise()
def setLastLabel(self, text, flags):
assert text
self.shapes[-1].label = text
self.shapes[-1].flags = flags
self.shapesBackups.pop()
self.storeShapes()
return self.shapes[-1]
def undoLastLine(self):
assert self.shapes
self.current = self.shapes.pop()
self.current.setOpen()
if self.createMode in ['polygon', 'linestrip']:
self.line.points = [self.current[-1], self.current[0]]
elif self.createMode in ['rectangle', 'line', 'circle']:
self.current.points = self.current.points[0:1]
elif self.createMode == 'point':
self.current = None
self.drawingPolygon.emit(True)
def undoLastPoint(self):
if not self.current or self.current.isClosed():
return
self.current.popPoint()
if len(self.current) > 0:
self.line[0] = self.current[-1]
else:
self.current = None
self.drawingPolygon.emit(False)
self.repaint()
def loadPixmap(self, pixmap):
self.pixmap = pixmap
self.shapes = []
self.repaint()
def loadShapes(self, shapes, replace=True):
if replace:
self.shapes = list(shapes)
else:
self.shapes.extend(shapes)
self.storeShapes()
self.current = None
self.hShape = None
self.hVertex = None
self.hEdge = None
self.repaint()
def setShapeVisible(self, shape, value):
self.visible[shape] = value
self.repaint()
def overrideCursor(self, cursor):
self.restoreCursor()
self._cursor = cursor
QtWidgets.QApplication.setOverrideCursor(cursor)
def restoreCursor(self):
QtWidgets.QApplication.restoreOverrideCursor()
def resetState(self):
self.restoreCursor()
self.pixmap = None
self.shapesBackups = []
self.update()
class Canvas(QtWidgets.QWidget):
zoomRequest = QtCore.Signal(int, QtCore.QPoint)
scrollRequest = QtCore.Signal(int, int)
newShape = QtCore.Signal()
selectionChanged = QtCore.Signal(list)
shapeMoved = QtCore.Signal()
drawingPolygon = QtCore.Signal(bool)
vertexSelected = QtCore.Signal(bool)
CREATE, EDIT = 0, 1
CREATE, EDIT = 0, 1
# polygon, rectangle, line, or point
_createMode = "polygon"
_fill_drawing = False
def __init__(self, *args, **kwargs):
self.epsilon = kwargs.pop("epsilon", 10.0)
self.double_click = kwargs.pop("double_click", "close")
if self.double_click not in [None, "close"]:
raise ValueError(
"Unexpected value for double_click event: {}".format(
self.double_click))
self.num_backups = kwargs.pop("num_backups", 10)
super(Canvas, self).__init__(*args, **kwargs)
# Initialise local state.
self.mode = self.EDIT
self.shapes = []
self.shapesBackups = []
self.current = None
self.selectedShapes = [] # save the selected shapes here
self.selectedShapesCopy = []
# self.line represents:
# - createMode == 'polygon': edge from last point to current
# - createMode == 'rectangle': diagonal line of the rectangle
# - createMode == 'line': the line
# - createMode == 'point': the point
self.line = Shape()
self.prevPoint = QtCore.QPoint()
self.prevMovePoint = QtCore.QPoint()
self.offsets = QtCore.QPoint(), QtCore.QPoint()
self.scale = 1.0
self.pixmap = QtGui.QPixmap()
self.visible = {}
self._hideBackround = False
self.hideBackround = False
self.hShape = None
self.prevhShape = None
self.hVertex = None
self.prevhVertex = None
self.hEdge = None
self.prevhEdge = None
self.movingShape = False
self.snapping = True
self.hShapeIsSelected = False
self._painter = QtGui.QPainter()
self._cursor = CURSOR_DEFAULT
# Menus:
# 0: right-click without selection and dragging of shapes
# 1: right-click with selection and dragging of shapes
self.menus = (QtWidgets.QMenu(), QtWidgets.QMenu())
# Set widget options.
self.setMouseTracking(True)
self.setFocusPolicy(QtCore.Qt.WheelFocus)
def fillDrawing(self):
return self._fill_drawing
def setFillDrawing(self, value):
self._fill_drawing = value
@property
def createMode(self):
return self._createMode
@createMode.setter
def createMode(self, value):
if value not in [
"polygon",
"rectangle",
"circle",
"line",
"point",
"linestrip",
]:
raise ValueError("Unsupported createMode: %s" % value)
self._createMode = value
def storeShapes(self):
shapesBackup = []
for shape in self.shapes:
shapesBackup.append(shape.copy())
if len(self.shapesBackups) > self.num_backups:
self.shapesBackups = self.shapesBackups[-self.num_backups - 1:]
self.shapesBackups.append(shapesBackup)
@property
def isShapeRestorable(self):
# We save the state AFTER each edit (not before) so for an
# edit to be undoable, we expect the CURRENT and the PREVIOUS state
# to be in the undo stack.
if len(self.shapesBackups) < 2:
return False
return True
def restoreShape(self):
# This does _part_ of the job of restoring shapes.
# The complete process is also done in app.py::undoShapeEdit
# and app.py::loadShapes and our own Canvas::loadShapes function.
if not self.isShapeRestorable:
return
self.shapesBackups.pop() # latest
# The application will eventually call Canvas.loadShapes which will
# push this right back onto the stack.
shapesBackup = self.shapesBackups.pop()
self.shapes = shapesBackup
self.selectedShapes = []
for shape in self.shapes:
shape.selected = False
self.update()
def enterEvent(self, ev):
self.overrideCursor(self._cursor)
def leaveEvent(self, ev):
self.unHighlight()
self.restoreCursor()
def focusOutEvent(self, ev):
self.restoreCursor()
def isVisible(self, shape):
return self.visible.get(shape, True)
def drawing(self):
return self.mode == self.CREATE
def editing(self):
return self.mode == self.EDIT
def setEditing(self, value=True):
self.mode = self.EDIT if value else self.CREATE
if not value: # Create
self.unHighlight()
self.deSelectShape()
def unHighlight(self):
if self.hShape:
self.hShape.highlightClear()
self.update()
self.prevhShape = self.hShape
self.prevhVertex = self.hVertex
self.prevhEdge = self.hEdge
self.hShape = self.hVertex = self.hEdge = None
def selectedVertex(self):
return self.hVertex is not None
def selectedEdge(self):
return self.hEdge is not None
def mouseMoveEvent(self, ev):
"""Update line with last point and current coordinates."""
try:
if QT5:
pos = self.transformPos(ev.localPos())
else:
pos = self.transformPos(ev.posF())
except AttributeError:
return
self.prevMovePoint = pos
self.restoreCursor()
if self.pixmap:
self.parent().window().labelCoordinates.setText('X: %d; Y: %d' %
(pos.x(), pos.y()))
# Polygon drawing.
if self.drawing():
self.line.shape_type = self.createMode
self.overrideCursor(CURSOR_DRAW)
if not self.current:
return
if self.outOfPixmap(pos):
# Don't allow the user to draw outside the pixmap.
# Project the point to the pixmap's edges.
pos = self.intersectionPoint(self.current[-1], pos)
elif (self.snapping and len(self.current) > 1
and self.createMode == "polygon"
and self.closeEnough(pos, self.current[0])):
# Attract line to starting point and
# colorise to alert the user.
pos = self.current[0]
self.overrideCursor(CURSOR_POINT)
self.current.highlightVertex(0, Shape.NEAR_VERTEX)
if self.createMode in ["polygon", "linestrip"]:
self.line[0] = self.current[-1]
self.line[1] = pos
if ev.buttons() & QtCore.Qt.LeftButton:
if self.ptDist(self.line[0], self.line[1]) > 50:
self.current.addPoint(self.line[1])
self.line[0] = self.current[-1]
if int(ev.modifiers()) == QtCore.Qt.ControlModifier:
self.finalise()
# print(f"distance button {self.ptDist(self.line[0],self.line[1])}")
elif self.createMode == "rectangle":
self.line.points = [self.current[0], pos]
self.line.close()
elif self.createMode == "circle":
self.line.points = [self.current[0], pos]
self.line.shape_type = "circle"
elif self.createMode == "line":
self.line.points = [self.current[0], pos]
self.line.close()
elif self.createMode == "point":
self.line.points = [self.current[0]]
self.line.close()
self.repaint()
self.current.highlightClear()
return
# Polygon copy moving.
if QtCore.Qt.RightButton & ev.buttons():
if self.selectedShapesCopy and self.prevPoint:
self.overrideCursor(CURSOR_MOVE)
self.boundedMoveShapes(self.selectedShapesCopy, pos)
self.repaint()
elif self.selectedShapes:
self.selectedShapesCopy = [
s.copy() for s in self.selectedShapes
]
self.repaint()
return
# Polygon/Vertex moving.
if QtCore.Qt.LeftButton & ev.buttons():
if self.selectedVertex():
self.boundedMoveVertex(pos)
self.repaint()
self.movingShape = True
elif self.selectedShapes and self.prevPoint:
self.overrideCursor(CURSOR_MOVE)
self.boundedMoveShapes(self.selectedShapes, pos)
self.repaint()
self.movingShape = True
return
# Just hovering over the canvas, 2 possibilities:
# - Highlight shapes
# - Highlight vertex
# Update shape/vertex fill and tooltip value accordingly.
self.setToolTip(self.tr("Image"))
for shape in reversed([s for s in self.shapes if self.isVisible(s)]):
# Look for a nearby vertex to highlight. If that fails,
# check if we happen to be inside a shape.
index = shape.nearestVertex(pos, self.epsilon / self.scale)
index_edge = shape.nearestEdge(pos, self.epsilon / self.scale)
if index is not None:
if self.selectedVertex():
self.hShape.highlightClear()
self.prevhVertex = self.hVertex = index
self.prevhShape = self.hShape = shape
self.prevhEdge = self.hEdge
self.hEdge = None
shape.highlightVertex(index, shape.MOVE_VERTEX)
self.overrideCursor(CURSOR_POINT)
self.setToolTip(self.tr("Click & drag to move point"))
self.setStatusTip(self.toolTip())
self.update()
break
elif index_edge is not None and shape.canAddPoint():
if self.selectedVertex():
self.hShape.highlightClear()
self.prevhVertex = self.hVertex
self.hVertex = None
self.prevhShape = self.hShape = shape
self.prevhEdge = self.hEdge = index_edge
self.overrideCursor(CURSOR_POINT)
self.setToolTip(self.tr("Click to create point"))
self.setStatusTip(self.toolTip())
self.update()
break
elif shape.containsPoint(pos):
if self.selectedVertex():
self.hShape.highlightClear()
self.prevhVertex = self.hVertex
self.hVertex = None
self.prevhShape = self.hShape = shape
self.prevhEdge = self.hEdge
self.hEdge = None
self.setToolTip(
self.tr("Click & drag to move shape '%s'") % shape.label)
self.setStatusTip(self.toolTip())
self.overrideCursor(CURSOR_GRAB)
self.update()
break
else: # Nothing found, clear highlights, reset state.
self.unHighlight()
self.vertexSelected.emit(self.hVertex is not None)
def ptDist(self, pt1, pt2):
# A line between both
line = QtCore.QLineF(pt1, pt2)
# Length
lineLength = line.length()
return lineLength
def addPointToEdge(self):
shape = self.prevhShape
index = self.prevhEdge
point = self.prevMovePoint
if shape is None or index is None or point is None:
return
shape.insertPoint(index, point)
shape.highlightVertex(index, shape.MOVE_VERTEX)
self.hShape = shape
self.hVertex = index
self.hEdge = None
self.movingShape = True
def removeSelectedPoint(self):
shape = self.prevhShape
index = self.prevhVertex
if shape is None or index is None:
return
shape.removePoint(index)
shape.highlightClear()
self.hShape = shape
self.prevhVertex = None
self.movingShape = True # Save changes
def mousePressEvent(self, ev):
if QT5:
pos = self.transformPos(ev.localPos())
else:
pos = self.transformPos(ev.posF())
if ev.button() == QtCore.Qt.LeftButton:
if self.drawing():
if self.current:
# Add point to existing shape.
if self.createMode == "polygon":
self.current.addPoint(self.line[1])
self.line[0] = self.current[-1]
if self.current.isClosed():
self.finalise()
elif self.createMode in ["rectangle", "circle", "line"]:
assert len(self.current.points) == 1
self.current.points = self.line.points
self.finalise()
elif self.createMode == "linestrip":
self.current.addPoint(self.line[1])
self.line[0] = self.current[-1]
if int(ev.modifiers()) == QtCore.Qt.ControlModifier:
self.finalise()
elif not self.outOfPixmap(pos):
# Create new shape.
self.current = Shape(shape_type=self.createMode)
self.current.addPoint(pos)
if self.createMode == "point":
self.finalise()
else:
if self.createMode == "circle":
self.current.shape_type = "circle"
self.line.points = [pos, pos]
self.setHiding()
self.drawingPolygon.emit(True)
self.update()
elif self.editing():
if self.selectedEdge():
self.addPointToEdge()
elif (self.selectedVertex()
and int(ev.modifiers()) == QtCore.Qt.ShiftModifier):
# Delete point if: left-click + SHIFT on a point
self.removeSelectedPoint()
group_mode = int(ev.modifiers()) == QtCore.Qt.ControlModifier
self.selectShapePoint(pos, multiple_selection_mode=group_mode)
self.prevPoint = pos
self.repaint()
elif ev.button() == QtCore.Qt.RightButton and self.editing():
group_mode = int(ev.modifiers()) == QtCore.Qt.ControlModifier
if not self.selectedShapes or (self.hShape is not None
and self.hShape
not in self.selectedShapes):
self.selectShapePoint(pos, multiple_selection_mode=group_mode)
self.repaint()
self.prevPoint = pos
def mouseReleaseEvent(self, ev):
if ev.button() == QtCore.Qt.RightButton:
menu = self.menus[len(self.selectedShapesCopy) > 0]
self.restoreCursor()
if (not menu.exec_(self.mapToGlobal(ev.pos()))
and self.selectedShapesCopy):
# Cancel the move by deleting the shadow copy.
self.selectedShapesCopy = []
self.repaint()
elif ev.button() == QtCore.Qt.LeftButton:
if self.editing():
if (self.hShape is not None and self.hShapeIsSelected
and not self.movingShape):
self.selectionChanged.emit(
[x for x in self.selectedShapes if x != self.hShape])
if self.movingShape and self.hShape:
index = self.shapes.index(self.hShape)
if (self.shapesBackups[-1][index].points !=
self.shapes[index].points):
self.storeShapes()
self.shapeMoved.emit()
self.movingShape = False
def endMove(self, copy):
assert self.selectedShapes and self.selectedShapesCopy
assert len(self.selectedShapesCopy) == len(self.selectedShapes)
if copy:
for i, shape in enumerate(self.selectedShapesCopy):
self.shapes.append(shape)
self.selectedShapes[i].selected = False
self.selectedShapes[i] = shape
else:
for i, shape in enumerate(self.selectedShapesCopy):
self.selectedShapes[i].points = shape.points
self.selectedShapesCopy = []
self.repaint()
self.storeShapes()
return True
def hideBackroundShapes(self, value):
self.hideBackround = value
if self.selectedShapes:
# Only hide other shapes if there is a current selection.
# Otherwise the user will not be able to select a shape.
self.setHiding(True)
self.update()
def setHiding(self, enable=True):
self._hideBackround = self.hideBackround if enable else False
def canCloseShape(self):
return self.drawing() and self.current and len(self.current) > 2
def mouseDoubleClickEvent(self, ev):
# We need at least 4 points here, since the mousePress handler
# adds an extra one before this handler is called.
if (self.double_click == "close" and self.canCloseShape()
and len(self.current) > 3):
self.current.popPoint()
self.finalise()
def selectShapes(self, shapes):
self.setHiding()
self.selectionChanged.emit(shapes)
self.update()
def selectShapePoint(self, point, multiple_selection_mode):
"""Select the first shape created which contains this point."""
if self.selectedVertex(): # A vertex is marked for selection.
index, shape = self.hVertex, self.hShape
shape.highlightVertex(index, shape.MOVE_VERTEX)
else:
for shape in reversed(self.shapes):
if self.isVisible(shape) and shape.containsPoint(point):
self.setHiding()
if shape not in self.selectedShapes:
if multiple_selection_mode:
self.selectionChanged.emit(self.selectedShapes +
[shape])
else:
self.selectionChanged.emit([shape])
self.hShapeIsSelected = False
else:
self.hShapeIsSelected = True
self.calculateOffsets(point)
return
self.deSelectShape()
def calculateOffsets(self, point):
left = self.pixmap.width() - 1
right = 0
top = self.pixmap.height() - 1
bottom = 0
for s in self.selectedShapes:
rect = s.boundingRect()
if rect.left() < left:
left = rect.left()
if rect.right() > right:
right = rect.right()
if rect.top() < top:
top = rect.top()
if rect.bottom() > bottom:
bottom = rect.bottom()
x1 = left - point.x()
y1 = top - point.y()
x2 = right - point.x()
y2 = bottom - point.y()
self.offsets = QtCore.QPoint(x1, y1), QtCore.QPoint(x2, y2)
def boundedMoveVertex(self, pos):
index, shape = self.hVertex, self.hShape
point = shape[index]
if self.outOfPixmap(pos):
pos = self.intersectionPoint(point, pos)
shape.moveVertexBy(index, pos - point)
def boundedMoveShapes(self, shapes, pos):
if self.outOfPixmap(pos):
return False # No need to move
o1 = pos + self.offsets[0]
if self.outOfPixmap(o1):
pos -= QtCore.QPoint(min(0, o1.x()), min(0, o1.y()))
o2 = pos + self.offsets[1]
if self.outOfPixmap(o2):
pos += QtCore.QPoint(
min(0,
self.pixmap.width() - o2.x()),
min(0,
self.pixmap.height() - o2.y()),
)
# XXX: The next line tracks the new position of the cursor
# relative to the shape, but also results in making it
# a bit "shaky" when nearing the border and allows it to
# go outside of the shape's area for some reason.
# self.calculateOffsets(self.selectedShapes, pos)
dp = pos - self.prevPoint
if dp:
for shape in shapes:
shape.moveBy(dp)
self.prevPoint = pos
return True
return False
def deSelectShape(self):
if self.selectedShapes:
self.setHiding(False)
self.selectionChanged.emit([])
self.hShapeIsSelected = False
self.update()
def deleteSelected(self):
deleted_shapes = []
if self.selectedShapes:
for shape in self.selectedShapes:
self.shapes.remove(shape)
deleted_shapes.append(shape)
self.storeShapes()
self.selectedShapes = []
self.update()
return deleted_shapes
def deleteShape(self, shape):
if shape in self.selectedShapes:
self.selectedShapes.remove(shape)
if shape in self.shapes:
self.shapes.remove(shape)
self.storeShapes()
self.update()
def duplicateSelectedShapes(self):
if self.selectedShapes:
self.selectedShapesCopy = [s.copy() for s in self.selectedShapes]
self.boundedShiftShapes(self.selectedShapesCopy)
self.endMove(copy=True)
return self.selectedShapes
def boundedShiftShapes(self, shapes):
# Try to move in one direction, and if it fails in another.
# Give up if both fail.
point = shapes[0][0]
offset = QtCore.QPoint(2.0, 2.0)
self.offsets = QtCore.QPoint(), QtCore.QPoint()
self.prevPoint = point
if not self.boundedMoveShapes(shapes, point - offset):
self.boundedMoveShapes(shapes, point + offset)
def paintEvent(self, event):
if not self.pixmap:
return super(Canvas, self).paintEvent(event)
p = self._painter
p.begin(self)
p.setRenderHint(QtGui.QPainter.Antialiasing)
p.setRenderHint(QtGui.QPainter.HighQualityAntialiasing)
p.setRenderHint(QtGui.QPainter.SmoothPixmapTransform)
p.scale(self.scale, self.scale)
p.translate(self.offsetToCenter())
p.drawPixmap(0, 0, self.pixmap)
Shape.scale = self.scale
for shape in self.shapes:
if (shape.selected
or not self._hideBackround) and self.isVisible(shape):
shape.fill = shape.selected or shape == self.hShape
shape.paint(p)
if self.current:
self.current.paint(p)
self.line.paint(p)
if self.selectedShapesCopy:
for s in self.selectedShapesCopy:
s.paint(p)
if (self.fillDrawing() and self.createMode == "polygon"
and self.current is not None
and len(self.current.points) >= 2):
drawing_shape = self.current.copy()
drawing_shape.addPoint(self.line[1])
drawing_shape.fill = True
drawing_shape.paint(p)
p.end()
def transformPos(self, point):
"""Convert from widget-logical coordinates to painter-logical ones."""
return point / self.scale - self.offsetToCenter()
def offsetToCenter(self):
s = self.scale
area = super(Canvas, self).size()
w, h = self.pixmap.width() * s, self.pixmap.height() * s
aw, ah = area.width(), area.height()
x = (aw - w) / (2 * s) if aw > w else 0
y = (ah - h) / (2 * s) if ah > h else 0
return QtCore.QPoint(x, y)
def outOfPixmap(self, p):
w, h = self.pixmap.width(), self.pixmap.height()
return not (0 <= p.x() <= w - 1 and 0 <= p.y() <= h - 1)
def finalise(self):
assert self.current
self.current.close()
self.shapes.append(self.current)
self.storeShapes()
self.current = None
self.setHiding(False)
self.newShape.emit()
self.update()
def closeEnough(self, p1, p2):
# d = distance(p1 - p2)
# m = (p1-p2).manhattanLength()
# print "d %.2f, m %d, %.2f" % (d, m, d - m)
# divide by scale to allow more precision when zoomed in
return labelme.utils.distance(p1 - p2) < (self.epsilon / self.scale)
def intersectionPoint(self, p1, p2):
# Cycle through each image edge in clockwise fashion,
# and find the one intersecting the current line segment.
# http://paulbourke.net/geometry/lineline2d/
size = self.pixmap.size()
points = [
(0, 0),
(size.width() - 1, 0),
(size.width() - 1, size.height() - 1),
(0, size.height() - 1),
]
# x1, y1 should be in the pixmap, x2, y2 should be out of the pixmap
x1 = min(max(p1.x(), 0), size.width() - 1)
y1 = min(max(p1.y(), 0), size.height() - 1)
x2, y2 = p2.x(), p2.y()
d, i, (x, y) = min(self.intersectingEdges((x1, y1), (x2, y2), points))
x3, y3 = points[i]
x4, y4 = points[(i + 1) % 4]
if (x, y) == (x1, y1):
# Handle cases where previous point is on one of the edges.
if x3 == x4:
return QtCore.QPoint(x3, min(max(0, y2), max(y3, y4)))
else: # y3 == y4
return QtCore.QPoint(min(max(0, x2), max(x3, x4)), y3)
return QtCore.QPoint(x, y)
def intersectingEdges(self, point1, point2, points):
"""Find intersecting edges.
For each edge formed by `points', yield the intersection
with the line segment `(x1,y1) - (x2,y2)`, if it exists.
Also return the distance of `(x2,y2)' to the middle of the
edge along with its index, so that the one closest can be chosen.
"""
(x1, y1) = point1
(x2, y2) = point2
for i in range(4):
x3, y3 = points[i]
x4, y4 = points[(i + 1) % 4]
denom = (y4 - y3) * (x2 - x1) - (x4 - x3) * (y2 - y1)
nua = (x4 - x3) * (y1 - y3) - (y4 - y3) * (x1 - x3)
nub = (x2 - x1) * (y1 - y3) - (y2 - y1) * (x1 - x3)
if denom == 0:
# This covers two cases:
# nua == nub == 0: Coincident
# otherwise: Parallel
continue
ua, ub = nua / denom, nub / denom
if 0 <= ua <= 1 and 0 <= ub <= 1:
x = x1 + ua * (x2 - x1)
y = y1 + ua * (y2 - y1)
m = QtCore.QPoint((x3 + x4) / 2, (y3 + y4) / 2)
d = labelme.utils.distance(m - QtCore.QPoint(x2, y2))
yield d, i, (x, y)
# These two, along with a call to adjustSize are required for the
# scroll area.
def sizeHint(self):
return self.minimumSizeHint()
def minimumSizeHint(self):
if self.pixmap:
return self.scale * self.pixmap.size()
return super(Canvas, self).minimumSizeHint()
def wheelEvent(self, ev):
if QT5:
mods = ev.modifiers()
delta = ev.angleDelta()
if QtCore.Qt.ControlModifier == int(mods):
# with Ctrl/Command key
# zoom
self.zoomRequest.emit(delta.y(), ev.pos())
else:
# scroll
self.scrollRequest.emit(delta.x(), QtCore.Qt.Horizontal)
self.scrollRequest.emit(delta.y(), QtCore.Qt.Vertical)
else:
if ev.orientation() == QtCore.Qt.Vertical:
mods = ev.modifiers()
if QtCore.Qt.ControlModifier == int(mods):
# with Ctrl/Command key
self.zoomRequest.emit(ev.delta(), ev.pos())
else:
self.scrollRequest.emit(
ev.delta(),
QtCore.Qt.Horizontal if
(QtCore.Qt.ShiftModifier
== int(mods)) else QtCore.Qt.Vertical,
)
else:
self.scrollRequest.emit(ev.delta(), QtCore.Qt.Horizontal)
ev.accept()
def moveByKeyboard(self, offset):
if self.selectedShapes:
self.boundedMoveShapes(self.selectedShapes,
self.prevPoint + offset)
self.repaint()
self.movingShape = True
def keyPressEvent(self, ev):
modifiers = ev.modifiers()
key = ev.key()
if self.drawing():
if key == QtCore.Qt.Key_Escape and self.current:
self.current = None
self.drawingPolygon.emit(False)
self.update()
elif key == QtCore.Qt.Key_Return and self.canCloseShape():
self.finalise()
elif modifiers == QtCore.Qt.AltModifier:
self.snapping = False
elif self.editing():
if key == QtCore.Qt.Key_Up:
self.moveByKeyboard(QtCore.QPoint(0.0, -MOVE_SPEED))
elif key == QtCore.Qt.Key_Down:
self.moveByKeyboard(QtCore.QPoint(0.0, MOVE_SPEED))
elif key == QtCore.Qt.Key_Left:
self.moveByKeyboard(QtCore.QPoint(-MOVE_SPEED, 0.0))
elif key == QtCore.Qt.Key_Right:
self.moveByKeyboard(QtCore.QPoint(MOVE_SPEED, 0.0))
def keyReleaseEvent(self, ev):
modifiers = ev.modifiers()
if self.drawing():
if int(modifiers) == 0:
self.snapping = True
elif self.editing():
if self.movingShape and self.selectedShapes:
index = self.shapes.index(self.selectedShapes[0])
if (self.shapesBackups[-1][index].points !=
self.shapes[index].points):
self.storeShapes()
self.shapeMoved.emit()
self.movingShape = False
def setLastLabel(self, text, flags):
assert text
self.shapes[-1].label = text
self.shapes[-1].flags = flags
self.shapesBackups.pop()
self.storeShapes()
return self.shapes[-1]
def undoLastLine(self):
assert self.shapes
self.current = self.shapes.pop()
self.current.setOpen()
if self.createMode in ["polygon", "linestrip"]:
self.line.points = [self.current[-1], self.current[0]]
elif self.createMode in ["rectangle", "line", "circle"]:
self.current.points = self.current.points[0:1]
elif self.createMode == "point":
self.current = None
self.drawingPolygon.emit(True)
def undoLastPoint(self):
if not self.current or self.current.isClosed():
return
self.current.popPoint()
if len(self.current) > 0:
self.line[0] = self.current[-1]
else:
self.current = None
self.drawingPolygon.emit(False)
self.update()
def loadPixmap(self, pixmap, clear_shapes=True):
self.pixmap = pixmap
if clear_shapes:
self.shapes = []
self.update()
def loadShapes(self, shapes, replace=True):
if replace:
self.shapes = list(shapes)
else:
self.shapes.extend(shapes)
self.storeShapes()
self.current = None
self.hShape = None
self.hVertex = None
self.hEdge = None
self.update()
def setShapeVisible(self, shape, value):
self.visible[shape] = value
self.update()
def overrideCursor(self, cursor):
self.restoreCursor()
self._cursor = cursor
QtWidgets.QApplication.setOverrideCursor(cursor)
def restoreCursor(self):
QtWidgets.QApplication.restoreOverrideCursor()
def resetState(self):
self.restoreCursor()
self.pixmap = None
self.shapesBackups = []
self.update()