def paintSection(self, painter: QPainter, rect: QRect, logicalIndex: int):
if rect.isValid():
leafIndex = QModelIndex(self._pd.leafIndex(logicalIndex))
if leafIndex.isValid():
if self.orientation() == Qt.Horizontal:
self._pd.paintHorizontalSection(
painter, rect, logicalIndex, self,
self.styleOptionForCell(logicalIndex), leafIndex)
else:
self._pd.paintVerticalSection(
painter, rect, logicalIndex, self,
self.styleOptionForCell(logicalIndex), leafIndex)
return
super().paintSection(painter, rect, logicalIndex)
class BrushingModel(QObject):
brushSizeChanged = pyqtSignal(int)
brushColorChanged = pyqtSignal(QColor)
brushStrokeAvailable = pyqtSignal(QPointF, object)
drawnNumberChanged = pyqtSignal(int)
minBrushSize = 1
maxBrushSize = 61
defaultBrushSize = 3
defaultDrawnNumber = 1
defaultColor = Qt.white
erasingColor = Qt.black
erasingNumber = 100
def __init__(self, parent=None):
QObject.__init__(self, parent=parent)
self.sliceRect = None
self.bb = QRect() #bounding box enclosing the drawing
self.brushSize = self.defaultBrushSize
self.drawColor = self.defaultColor
self._temp_color = None
self._temp_number = None
self.drawnNumber = self.defaultDrawnNumber
self.pos = None
self.erasing = False
self._hasMoved = False
self.drawOnto = None
#an empty scene, where we add all drawn line segments
#a QGraphicsLineItem, and which we can use to then
#render to an image
self.scene = QGraphicsScene()
def toggleErase(self):
self.erasing = not(self.erasing)
if self.erasing:
self.setErasing()
else:
self.disableErasing()
def setErasing(self):
self.erasing = True
self._temp_color = self.drawColor
self._temp_number = self.drawnNumber
self.setBrushColor(self.erasingColor)
self.brushColorChanged.emit(self.erasingColor)
self.setDrawnNumber(self.erasingNumber)
def disableErasing(self):
self.erasing = False
self.setBrushColor(self._temp_color)
self.brushColorChanged.emit(self.drawColor)
self.setDrawnNumber(self._temp_number)
def setBrushSize(self, size):
self.brushSize = size
self.brushSizeChanged.emit(self.brushSize)
def setDrawnNumber(self, num):
self.drawnNumber = num
self.drawnNumberChanged.emit(num)
def getBrushSize(self):
return self.brushSize
def brushSmaller(self):
b = self.brushSize
if b > self.minBrushSize:
self.setBrushSize(b-1)
def brushBigger(self):
b = self.brushSize
if self.brushSize < self.maxBrushSize:
self.setBrushSize(b+1)
def setBrushColor(self, color):
self.drawColor = color
self.brushColorChanged.emit(self.drawColor)
def beginDrawing(self, pos, sliceRect):
'''
pos -- QPointF-like
'''
self.sliceRect = sliceRect
self.scene.clear()
self.bb = QRect()
self.pos = QPointF(pos.x(), pos.y())
self._hasMoved = False
def endDrawing(self, pos):
has_moved = self._hasMoved # _hasMoved will change after calling moveTo
if has_moved:
self.moveTo(pos)
else:
assert(self.pos == pos)
self.moveTo(QPointF(pos.x()+0.0001, pos.y()+0.0001)) # move a little
tempi = QImage(QSize(self.bb.width(), self.bb.height()), QImage.Format_ARGB32_Premultiplied) #TODO: format
tempi.fill(0)
painter = QPainter(tempi)
self.scene.render(painter, target=QRectF(), source=QRectF(QPointF(self.bb.x(), self.bb.y()), QSizeF(self.bb.width(), self.bb.height())))
painter.end()
ndarr = qimage2ndarray.rgb_view(tempi)[:,:,0]
labels = numpy.where(ndarr>0,numpy.uint8(self.drawnNumber),numpy.uint8(0))
labels = labels.swapaxes(0,1)
assert labels.shape[0] == self.bb.width()
assert labels.shape[1] == self.bb.height()
##
## ensure that at least one pixel is label when the brush size is 1
##
## this happens when the user just clicked without moving
## in that case the lineitem will be so tiny, that it won't be rendered
## into a single pixel by the code above
if not has_moved and self.brushSize <= 1 and numpy.count_nonzero(labels) == 0:
labels[labels.shape[0]//2, labels.shape[1]//2] = self.drawnNumber
self.brushStrokeAvailable.emit(QPointF(self.bb.x(), self.bb.y()), labels)
def dumpDraw(self, pos):
res = self.endDrawing(pos)
self.beginDrawing(pos, self.sliceRect)
return res
def moveTo(self, pos):
#data coordinates
oldX, oldY = self.pos.x(), self.pos.y()
x,y = pos.x(), pos.y()
line = QGraphicsLineItem(oldX, oldY, x, y)
line.setPen(QPen( QBrush(Qt.white), self.brushSize, Qt.SolidLine, Qt.RoundCap, Qt.RoundJoin))
self.scene.addItem(line)
self._hasMoved = True
#update bounding Box
if not self.bb.isValid():
self.bb = QRect(QPoint(oldX,oldY), QSize(1,1))
#grow bounding box
self.bb.setLeft( min(self.bb.left(), max(0, x-self.brushSize/2-1) ) )
self.bb.setRight( max(self.bb.right(), min(self.sliceRect[0]-1, x+self.brushSize/2+1) ) )
self.bb.setTop( min(self.bb.top(), max(0, y-self.brushSize/2-1) ) )
self.bb.setBottom(max(self.bb.bottom(), min(self.sliceRect[1]-1, y+self.brushSize/2+1) ) )
#update/move position
self.pos = pos
def paintSection(self, painter: QPainter, rect: QRect, logicalIndex: int):
if rect.isValid():
leafIndex = QModelIndex(self._pd.leafIndex(logicalIndex))
if leafIndex.isValid():
if self.orientation() == Qt.Horizontal:
self._pd.paintHorizontalSection(painter, rect, logicalIndex, self, self.styleOptionForCell(logicalIndex), leafIndex)
else:
self._pd.paintVerticalSection(painter, rect, logicalIndex, self, self.styleOptionForCell(logicalIndex), leafIndex)
return
super().paintSection(painter, rect, logicalIndex)
def on_sectionResized(self, logicalIndex: int):
if self.isSectionHidden(logicalIndex):
return
leafIndex = QModelIndex(self._pd.leafIndex(logicalIndex))
if leafIndex.isValid():
leafsList = QModelIndexList(self._pd.leafs(self._pd.findRootIndex(leafIndex)))
for n in range(leafsList.indexOf(leafIndex), 0, -1):
logicalIndex-=1
w = self.viewport().width()
h = self.viewport().height()
pos = self.sectionViewportPosition(logicalIndex)
r = QRect(pos, 0, w - pos, h)
if self.orientation() == Qt.Horizontal:
if self.isRightToLeft():
r.setRect(0, 0, pos + self.sectionSize(logicalIndex), h)
else:
r.setRect(0, pos, w, h - pos)
self.viewport().update(r.normalized())
def setModel(self, model):
super().setModel(model)
model.layoutChanged.connect(self.layoutChanged)
self.layoutChanged()
def layoutChanged(self):
if self.model():
self._pd.initFromNewModel(self.orientation(), self.model())
axis = ("column", "row")[self.orientation()!=Qt.Horizontal]
cnt = getattr(self.model(), axis+"Count")(QModelIndex())
if cnt:
self.initializeSections(0, cnt-1)
MultiIndexHeaderView=HierarchicalHeaderView
class DataFrameModel(QtCore.QAbstractTableModel):
#na_values:least|greatest - for sorting
options = {"striped": True, "stripesColor": "#fafafa", "na_values": "least",
"tooltip_min_len": 21}
def __init__(self, dataframe=None):
super().__init__()
self.setDataFrame(dataframe if dataframe is not None else pd.DataFrame())
def setDataFrame(self, dataframe):
self.df = dataframe.copy()
# self.df_full = self.df
self.layoutChanged.emit()
def rowCount(self, parent):
return len(self.df)
def columnCount(self, parent):
return len(self.df.columns)
def readLevel(self, y=0, xs=0, xe=None, orient=None):
c = getattr(self.df, ("columns", "index")[orient!=HorizontalHeaderDataRole])
if not hasattr(c, "levels"): #not MultiIndex
return [QtGui.QStandardItem(str(i)) for i in c]
sibl = []
section_start, v, xe = xs, None, xe or len(c)
for i in range(xs, xe):
label = c.labels[y][i]
if label!=v:
if y+1<len(c.levels) and i>xs:
children = self.readLevel(y+1, section_start, i, orient=orient)
sibl[-1].appendRow(children)
item = QtGui.QStandardItem(str(c.levels[y][label]))
sibl.append(item)
section_start = i
v=label
if y+1<len(c.levels):
children = self.readLevel(y+1, section_start, orient=orient)
sibl[-1].appendRow(children)
return sibl
def data(self, index, role):
row, col = index.row(), index.column()
if role in (Qt.DisplayRole, Qt.ToolTipRole):
ret = self.df.iat[row, col]
if ret is not None and ret==ret: #convert to str except for None, NaN, NaT
if isinstance(ret, float):
ret = "{:n}".format(ret)
elif isinstance(ret, datetime.date):
#FIXME: show microseconds optionally
ret = ret.strftime(("%x", "%c")[isinstance(ret, datetime.datetime)])
else: ret = str(ret)
if role == Qt.ToolTipRole:
if len(ret)<self.options["tooltip_min_len"]: ret = ""
return ret
elif role == Qt.BackgroundRole:
if self.options["striped"] and row%2:
return QBrush(QColor(self.options["stripesColor"]))
elif role in (HorizontalHeaderDataRole, VerticalHeaderDataRole):
hm = QtGui.QStandardItemModel()
hm.appendRow(self.readLevel(orient=role))
return hm
def reorder(self, oldIndex, newIndex, orientation):
"Reorder columns / rows"
horizontal = orientation==Qt.Horizontal
cols = list(self.df.columns if horizontal else self.df.index)
cols.insert(newIndex, cols.pop(oldIndex))
self.df = self.df[cols] if horizontal else self.df.T[cols].T
return True
# def filter(self, filt=None):
# self.df = self.df_full if filt is None else self.df[filt]
# self.layoutChanged.emit()
def headerData(self, section, orientation, role):
if role != Qt.DisplayRole: return
label = getattr(self.df, ("columns", "index")[orientation!=Qt.Horizontal])[section]
# return label if type(label) is tuple else label
return ("\n", " | ")[orientation!=Qt.Horizontal].join(str(i) for i in label) if type(label) is tuple else str(label)
def dataFrame(self):
return self.df
def sort(self, column, order):
# print("sort", column, order) #FIXME: double sort after setSortingEnabled(True)
if len(self.df):
asc = order==Qt.AscendingOrder
na_pos = 'first' if (self.options["na_values"]=="least")==asc else 'last'
self.df.sort_values(self.df.columns[column], ascending=asc,
inplace=True, na_position=na_pos)
self.layoutChanged.emit()
if __name__=="__main__":
import sys, locale
locale.setlocale(locale.LC_ALL, '') #system locale settings
app = QtGui.QApplication(sys.argv)
form = QtGui.QWidget()
form.setAttribute(Qt.WA_DeleteOnClose) #http://stackoverflow.com/a/27178019/1119602
form.setMinimumSize(700, 260)
view = QtGui.QTableView()
QtGui.QVBoxLayout(form).addWidget(view)
form.show()
#Prepare data
tuples=[('bar', 'one', 'q'), ('bar', 'two', 'q'), ('baz', 'one', 'q'), ('baz', 'two', 'q'),
('foo', 'one', 'q'), ('foo', 'two', 'q'), ('qux', 'one', 'q'), ('qux', 'two', 'q')]
index = pd.MultiIndex.from_tuples(tuples, names=['first', 'second', 'third'])
df=pd.DataFrame(pd.np.random.randn(6, 6), index=index[:6], columns=index[:6])
print("DataFrame:\n%s"%df)
#Prepare view
# oldh, oldv = view.horizontalHeader(), view.verticalHeader()
# oldh.setParent(form), oldv.setParent(form) #Save old headers for some reason
MultiIndexHeaderView(Qt.Horizontal, view)
MultiIndexHeaderView(Qt.Vertical, view)
view.horizontalHeader().setMovable(True) #reorder DataFrame columns manually
#Set data
view.setModel(DataFrameModel(df))
view.resizeColumnsToContents()
view.resizeRowsToContents()
#Set sorting enabled (after setting model)
view.setSortingEnabled(True)
sys.exit(app.exec())
def lineSelectionRect(self, line):
rect = QRect(line.p1(), line.p2()).normalized()
if rect.isValid():
rect.adjust(-2, -2, 2, 2)
return rect
class BrushingModel(QObject):
brushSizeChanged = pyqtSignal(int)
brushColorChanged = pyqtSignal(QColor)
brushStrokeAvailable = pyqtSignal(QPointF, object)
drawnNumberChanged = pyqtSignal(int)
minBrushSize = 1
maxBrushSize = 61
defaultBrushSize = 3
defaultDrawnNumber = 1
defaultColor = Qt.white
erasingColor = Qt.black
erasingNumber = 100
def __init__(self):
QObject.__init__(self)
self.sliceRect = None
self.bb = QRect() #bounding box enclosing the drawing
self.brushSize = self.defaultBrushSize
self.drawColor = self.defaultColor
self._temp_color = None
self._temp_number = None
self.drawnNumber = self.defaultDrawnNumber
self.pos = None
self.erasing = False
self.drawOnto = None
#an empty scene, where we add all drawn line segments
#a QGraphicsLineItem, and which we can use to then
#render to an image
self.scene = QGraphicsScene()
def toggleErase(self):
self.erasing = not(self.erasing)
if self.erasing:
self.setErasing()
else:
self.disableErasing()
def setErasing(self):
self.erasing = True
self._temp_color = self.drawColor
self._temp_number = self.drawnNumber
self.setBrushColor(self.erasingColor)
self.brushColorChanged.emit(self.erasingColor)
self.setDrawnNumber(self.erasingNumber)
def disableErasing(self):
self.erasing = False
self.setBrushColor(self._temp_color)
self.brushColorChanged.emit(self.drawColor)
self.setDrawnNumber(self._temp_number)
def setBrushSize(self, size):
self.brushSize = size
self.brushSizeChanged.emit(self.brushSize)
def setDrawnNumber(self, num):
print "Setting Drawnnumer", num
self.drawnNumber = num
self.drawnNumberChanged.emit(num)
def getBrushSize(self):
return self.brushSize
def brushSmaller(self):
b = self.brushSize
if b > self.minBrushSize:
self.setBrushSize(b-1)
def brushBigger(self):
b = self.brushSize
if self.brushSize < self.maxBrushSize:
self.setBrushSize(b+1)
def setBrushColor(self, color):
self.drawColor = color
self.brushColorChanged.emit(self.drawColor)
def beginDrawing(self, pos, sliceRect):
self.sliceRect = sliceRect
self.scene.clear()
self.bb = QRect()
self.pos = QPointF(pos.x()+0.0001, pos.y()+0.0001)
line = self.moveTo(pos)
return line
def endDrawing(self, pos):
self.moveTo(pos)
tempi = QImage(QSize(self.bb.width(), self.bb.height()), QImage.Format_ARGB32_Premultiplied) #TODO: format
tempi.fill(0)
painter = QPainter(tempi)
self.scene.render(painter, target=QRectF(), source=QRectF(QPointF(self.bb.x(), self.bb.y()), QSizeF(self.bb.width(), self.bb.height())))
painter.end()
ndarr = qimage2ndarray.rgb_view(tempi)[:,:,0]
labels = numpy.where(ndarr>0,numpy.uint8(self.drawnNumber),numpy.uint8(0))
labels = labels.swapaxes(0,1)
assert labels.shape[0] == self.bb.width()
assert labels.shape[1] == self.bb.height()
self.brushStrokeAvailable.emit(QPointF(self.bb.x(), self.bb.y()), labels)
def dumpDraw(self, pos):
res = self.endDrawing(pos)
self.beginDrawing(pos, self.sliceRect)
return res
def moveTo(self, pos):
oldX, oldY = self.pos.x(), self.pos.y()
x,y = pos.x(), pos.y()
#print "BrushingModel.moveTo(pos=%r)" % (pos)
line = QGraphicsLineItem(oldX, oldY, x, y)
line.setPen(QPen( QBrush(Qt.white), self.brushSize, Qt.SolidLine, Qt.RoundCap, Qt.RoundJoin))
self.scene.addItem(line)
#update bounding Box
if not self.bb.isValid():
self.bb = QRect(QPoint(x,y), QSize(1,1))
#grow bounding box
self.bb.setLeft( min(self.bb.left(), max(0, x-self.brushSize/2-1) ) )
self.bb.setRight( max(self.bb.right(), min(self.sliceRect[0]-1, x+self.brushSize/2+1) ) )
self.bb.setTop( min(self.bb.top(), max(0, y-self.brushSize/2-1) ) )
self.bb.setBottom(max(self.bb.bottom(), min(self.sliceRect[1]-1, y+self.brushSize/2+1) ) )
#update/move position
self.pos = pos
class BrushingModel(QObject):
brushSizeChanged = pyqtSignal(int)
brushColorChanged = pyqtSignal(QColor)
brushStrokeAvailable = pyqtSignal(QPointF, object)
drawnNumberChanged = pyqtSignal(int)
minBrushSize = 1
maxBrushSize = 61
defaultBrushSize = 3
defaultDrawnNumber = 1
defaultColor = Qt.white
erasingColor = Qt.black
erasingNumber = 100
def __init__(self, parent=None):
QObject.__init__(self, parent=parent)
self.sliceRect = None
self.bb = QRect() #bounding box enclosing the drawing
self.brushSize = self.defaultBrushSize
self.drawColor = self.defaultColor
self._temp_color = None
self._temp_number = None
self.drawnNumber = self.defaultDrawnNumber
self.pos = None
self.erasing = False
self._hasMoved = False
self.drawOnto = None
#an empty scene, where we add all drawn line segments
#a QGraphicsLineItem, and which we can use to then
#render to an image
self.scene = QGraphicsScene()
def toggleErase(self):
self.erasing = not (self.erasing)
if self.erasing:
self.setErasing()
else:
self.disableErasing()
def setErasing(self):
self.erasing = True
self._temp_color = self.drawColor
self._temp_number = self.drawnNumber
self.setBrushColor(self.erasingColor)
self.brushColorChanged.emit(self.erasingColor)
self.setDrawnNumber(self.erasingNumber)
def disableErasing(self):
self.erasing = False
self.setBrushColor(self._temp_color)
self.brushColorChanged.emit(self.drawColor)
self.setDrawnNumber(self._temp_number)
def setBrushSize(self, size):
self.brushSize = size
self.brushSizeChanged.emit(self.brushSize)
def setDrawnNumber(self, num):
self.drawnNumber = num
self.drawnNumberChanged.emit(num)
def getBrushSize(self):
return self.brushSize
def brushSmaller(self):
b = self.brushSize
if b > self.minBrushSize:
self.setBrushSize(b - 1)
def brushBigger(self):
b = self.brushSize
if self.brushSize < self.maxBrushSize:
self.setBrushSize(b + 1)
def setBrushColor(self, color):
self.drawColor = color
self.brushColorChanged.emit(self.drawColor)
def beginDrawing(self, pos, sliceRect):
'''
pos -- QPointF-like
'''
self.sliceRect = sliceRect
self.scene.clear()
self.bb = QRect()
self.pos = QPointF(pos.x(), pos.y())
self._hasMoved = False
def endDrawing(self, pos):
has_moved = self._hasMoved # _hasMoved will change after calling moveTo
if has_moved:
self.moveTo(pos)
else:
assert (self.pos == pos)
self.moveTo(QPointF(pos.x() + 0.0001,
pos.y() + 0.0001)) # move a little
# Qt seems to use strange rules for determining which pixels to set when rendering a brush stroke to a QImage.
# We seem to get better results if we do the following:
# 1) Slightly offset the source window because apparently there is a small shift in the data
# 2) Render the scene to an image that is MUCH larger than the scene resolution (4x by 4x)
# 3) Downsample each 4x4 patch from the large image back to a single pixel in the final image,
# applying some threshold to determine if the final pixel is on or off.
tempi = QImage(QSize(4 * self.bb.width(), 4 * self.bb.height()),
QImage.Format_ARGB32_Premultiplied) #TODO: format
tempi.fill(0)
painter = QPainter(tempi)
# Offset the source window. At first I thought the right offset was 0.5, because
# that would seem to make sure points are rounded to pixel CENTERS, but
# experimentation indicates that 0.25 is slightly better for some reason...
source_rect = QRectF(QPointF(self.bb.x() + 0.25,
self.bb.y() + 0.25),
QSizeF(self.bb.width(), self.bb.height()))
target_rect = QRectF(QPointF(0, 0),
QSizeF(4 * self.bb.width(), 4 * self.bb.height()))
self.scene.render(painter, target=target_rect, source=source_rect)
painter.end()
# Now downsample: convert each 4x4 patch into a single pixel by summing and dividing
ndarr = qimage2ndarray.rgb_view(tempi)[:, :, 0].astype(int)
ndarr = ndarr.reshape((ndarr.shape[0], ) + (ndarr.shape[1] // 4, ) +
(4, ))
ndarr = ndarr.sum(axis=-1)
ndarr = ndarr.transpose()
ndarr = ndarr.reshape((ndarr.shape[0], ) + (ndarr.shape[1] // 4, ) +
(4, ))
ndarr = ndarr.sum(axis=-1)
ndarr = ndarr.transpose()
ndarr //= 4 * 4
downsample_threshold = (7. / 16) * 255
labels = numpy.where(ndarr >= downsample_threshold,
numpy.uint8(self.drawnNumber), numpy.uint8(0))
labels = labels.swapaxes(0, 1)
assert labels.shape[0] == self.bb.width()
assert labels.shape[1] == self.bb.height()
##
## ensure that at least one pixel is label when the brush size is 1
##
## this happens when the user just clicked without moving
## in that case the lineitem will be so tiny, that it won't be rendered
## into a single pixel by the code above
if not has_moved and self.brushSize <= 1 and numpy.count_nonzero(
labels) == 0:
labels[labels.shape[0] // 2,
labels.shape[1] // 2] = self.drawnNumber
self.brushStrokeAvailable.emit(QPointF(self.bb.x(), self.bb.y()),
labels)
def dumpDraw(self, pos):
res = self.endDrawing(pos)
self.beginDrawing(pos, self.sliceRect)
return res
def moveTo(self, pos):
#data coordinates
oldX, oldY = self.pos.x(), self.pos.y()
x, y = pos.x(), pos.y()
line = QGraphicsLineItem(oldX, oldY, x, y)
line.setPen(
QPen(QBrush(Qt.white), self.brushSize, Qt.SolidLine, Qt.RoundCap,
Qt.RoundJoin))
self.scene.addItem(line)
self._hasMoved = True
#update bounding Box
if not self.bb.isValid():
self.bb = QRect(QPoint(oldX, oldY), QSize(1, 1))
#grow bounding box
self.bb.setLeft(
min(self.bb.left(), max(0, x - self.brushSize // 2 - 1)))
self.bb.setRight(
max(self.bb.right(),
min(self.sliceRect[0] - 1, x + self.brushSize // 2 + 1)))
self.bb.setTop(min(self.bb.top(), max(0, y - self.brushSize // 2 - 1)))
self.bb.setBottom(
max(self.bb.bottom(),
min(self.sliceRect[1] - 1, y + self.brushSize // 2 + 1)))
#update/move position
self.pos = pos
def lineSelectionRect(self, line):
rect = QRect(line.p1(), line.p2()).normalized()
if rect.isValid():
rect.adjust(-2, -2, 2, 2)
return rect
class BrushingModel(QObject):
brushSizeChanged = pyqtSignal(int)
brushColorChanged = pyqtSignal(QColor)
brushStrokeAvailable = pyqtSignal(QPointF, object)
drawnNumberChanged = pyqtSignal(int)
minBrushSize = 1
maxBrushSize = 61
defaultBrushSize = 3
defaultDrawnNumber = 1
defaultColor = Qt.white
erasingColor = Qt.black
erasingNumber = 100
def __init__(self, parent=None):
QObject.__init__(self, parent=parent)
self.sliceRect = None
self.bb = QRect() #bounding box enclosing the drawing
self.brushSize = self.defaultBrushSize
self.drawColor = self.defaultColor
self._temp_color = None
self._temp_number = None
self.drawnNumber = self.defaultDrawnNumber
self.pos = None
self.erasing = False
self._hasMoved = False
self.drawOnto = None
#an empty scene, where we add all drawn line segments
#a QGraphicsLineItem, and which we can use to then
#render to an image
self.scene = QGraphicsScene()
def toggleErase(self):
self.erasing = not (self.erasing)
if self.erasing:
self.setErasing()
else:
self.disableErasing()
def setErasing(self):
self.erasing = True
self._temp_color = self.drawColor
self._temp_number = self.drawnNumber
self.setBrushColor(self.erasingColor)
self.brushColorChanged.emit(self.erasingColor)
self.setDrawnNumber(self.erasingNumber)
def disableErasing(self):
self.erasing = False
self.setBrushColor(self._temp_color)
self.brushColorChanged.emit(self.drawColor)
self.setDrawnNumber(self._temp_number)
def setBrushSize(self, size):
self.brushSize = size
self.brushSizeChanged.emit(self.brushSize)
def setDrawnNumber(self, num):
self.drawnNumber = num
self.drawnNumberChanged.emit(num)
def getBrushSize(self):
return self.brushSize
def brushSmaller(self):
b = self.brushSize
if b > self.minBrushSize:
self.setBrushSize(b - 1)
def brushBigger(self):
b = self.brushSize
if self.brushSize < self.maxBrushSize:
self.setBrushSize(b + 1)
def setBrushColor(self, color):
self.drawColor = color
self.brushColorChanged.emit(self.drawColor)
def beginDrawing(self, pos, sliceRect):
'''
pos -- QPointF-like
'''
self.sliceRect = sliceRect
self.scene.clear()
self.bb = QRect()
self.pos = QPointF(pos.x(), pos.y())
self._hasMoved = False
def endDrawing(self, pos):
has_moved = self._hasMoved # _hasMoved will change after calling moveTo
if has_moved:
self.moveTo(pos)
else:
assert (self.pos == pos)
self.moveTo(QPointF(pos.x() + 0.0001,
pos.y() + 0.0001)) # move a little
tempi = QImage(QSize(self.bb.width(), self.bb.height()),
QImage.Format_ARGB32_Premultiplied) #TODO: format
tempi.fill(0)
painter = QPainter(tempi)
self.scene.render(painter,
target=QRectF(),
source=QRectF(
QPointF(self.bb.x(), self.bb.y()),
QSizeF(self.bb.width(), self.bb.height())))
painter.end()
ndarr = qimage2ndarray.rgb_view(tempi)[:, :, 0]
labels = numpy.where(ndarr > 0, numpy.uint8(self.drawnNumber),
numpy.uint8(0))
labels = labels.swapaxes(0, 1)
assert labels.shape[0] == self.bb.width()
assert labels.shape[1] == self.bb.height()
##
## ensure that at least one pixel is label when the brush size is 1
##
## this happens when the user just clicked without moving
## in that case the lineitem will be so tiny, that it won't be rendered
## into a single pixel by the code above
if not has_moved and self.brushSize <= 1 and numpy.count_nonzero(
labels) == 0:
labels[labels.shape[0] // 2,
labels.shape[1] // 2] = self.drawnNumber
self.brushStrokeAvailable.emit(QPointF(self.bb.x(), self.bb.y()),
labels)
def dumpDraw(self, pos):
res = self.endDrawing(pos)
self.beginDrawing(pos, self.sliceRect)
return res
def moveTo(self, pos):
#data coordinates
oldX, oldY = self.pos.x(), self.pos.y()
x, y = pos.x(), pos.y()
line = QGraphicsLineItem(oldX, oldY, x, y)
line.setPen(
QPen(QBrush(Qt.white), self.brushSize, Qt.SolidLine, Qt.RoundCap,
Qt.RoundJoin))
self.scene.addItem(line)
self._hasMoved = True
#update bounding Box
if not self.bb.isValid():
self.bb = QRect(QPoint(oldX, oldY), QSize(1, 1))
#grow bounding box
self.bb.setLeft(min(self.bb.left(), max(0,
x - self.brushSize / 2 - 1)))
self.bb.setRight(
max(self.bb.right(),
min(self.sliceRect[0] - 1, x + self.brushSize / 2 + 1)))
self.bb.setTop(min(self.bb.top(), max(0, y - self.brushSize / 2 - 1)))
self.bb.setBottom(
max(self.bb.bottom(),
min(self.sliceRect[1] - 1, y + self.brushSize / 2 + 1)))
#update/move position
self.pos = pos
class BrushingModel(QObject):
brushSizeChanged = pyqtSignal(int)
brushColorChanged = pyqtSignal(QColor)
brushStrokeAvailable = pyqtSignal(QPointF, object)
drawnNumberChanged = pyqtSignal(int)
minBrushSize = 1
maxBrushSize = 61
defaultBrushSize = 3
defaultDrawnNumber = 1
defaultColor = Qt.white
erasingColor = Qt.black
erasingNumber = 100
def __init__(self, parent=None):
QObject.__init__(self, parent=parent)
self.sliceRect = None
self.bb = QRect() #bounding box enclosing the drawing
self.brushSize = self.defaultBrushSize
self.drawColor = self.defaultColor
self._temp_color = None
self._temp_number = None
self.drawnNumber = self.defaultDrawnNumber
self.pos = None
self.erasing = False
self._hasMoved = False
self.drawOnto = None
#an empty scene, where we add all drawn line segments
#a QGraphicsLineItem, and which we can use to then
#render to an image
self.scene = QGraphicsScene()
def toggleErase(self):
self.erasing = not(self.erasing)
if self.erasing:
self.setErasing()
else:
self.disableErasing()
def setErasing(self):
self.erasing = True
self._temp_color = self.drawColor
self._temp_number = self.drawnNumber
self.setBrushColor(self.erasingColor)
self.brushColorChanged.emit(self.erasingColor)
self.setDrawnNumber(self.erasingNumber)
def disableErasing(self):
self.erasing = False
self.setBrushColor(self._temp_color)
self.brushColorChanged.emit(self.drawColor)
self.setDrawnNumber(self._temp_number)
def setBrushSize(self, size):
self.brushSize = size
self.brushSizeChanged.emit(self.brushSize)
def setDrawnNumber(self, num):
self.drawnNumber = num
self.drawnNumberChanged.emit(num)
def getBrushSize(self):
return self.brushSize
def brushSmaller(self):
b = self.brushSize
if b > self.minBrushSize:
self.setBrushSize(b-1)
def brushBigger(self):
b = self.brushSize
if self.brushSize < self.maxBrushSize:
self.setBrushSize(b+1)
def setBrushColor(self, color):
self.drawColor = color
self.brushColorChanged.emit(self.drawColor)
def beginDrawing(self, pos, sliceRect):
'''
pos -- QPointF-like
'''
self.sliceRect = sliceRect
self.scene.clear()
self.bb = QRect()
self.pos = QPointF(pos.x(), pos.y())
self._hasMoved = False
def endDrawing(self, pos):
has_moved = self._hasMoved # _hasMoved will change after calling moveTo
if has_moved:
self.moveTo(pos)
else:
assert(self.pos == pos)
self.moveTo(QPointF(pos.x()+0.0001, pos.y()+0.0001)) # move a little
# Qt seems to use strange rules for determining which pixels to set when rendering a brush stroke to a QImage.
# We seem to get better results if we do the following:
# 1) Slightly offset the source window because apparently there is a small shift in the data
# 2) Render the scene to an image that is MUCH larger than the scene resolution (4x by 4x)
# 3) Downsample each 4x4 patch from the large image back to a single pixel in the final image,
# applying some threshold to determine if the final pixel is on or off.
tempi = QImage(QSize(4*self.bb.width(), 4*self.bb.height()), QImage.Format_ARGB32_Premultiplied) #TODO: format
tempi.fill(0)
painter = QPainter(tempi)
# Offset the source window. At first I thought the right offset was 0.5, because
# that would seem to make sure points are rounded to pixel CENTERS, but
# experimentation indicates that 0.25 is slightly better for some reason...
source_rect = QRectF( QPointF(self.bb.x()+0.25, self.bb.y()+0.25),
QSizeF(self.bb.width(), self.bb.height()) )
target_rect = QRectF( QPointF(0,0),
QSizeF(4*self.bb.width(), 4*self.bb.height()) )
self.scene.render(painter, target=target_rect, source=source_rect)
painter.end()
# Now downsample: convert each 4x4 patch into a single pixel by summing and dividing
ndarr = qimage2ndarray.rgb_view(tempi)[:,:,0].astype(int)
ndarr = ndarr.reshape( (ndarr.shape[0],) + (ndarr.shape[1]//4,) + (4,) )
ndarr = ndarr.sum(axis=-1)
ndarr = ndarr.transpose()
ndarr = ndarr.reshape( (ndarr.shape[0],) + (ndarr.shape[1]//4,) + (4,) )
ndarr = ndarr.sum(axis=-1)
ndarr = ndarr.transpose()
ndarr //= 4*4
downsample_threshold = (7./16)*255
labels = numpy.where(ndarr>=downsample_threshold, numpy.uint8(self.drawnNumber), numpy.uint8(0))
labels = labels.swapaxes(0,1)
assert labels.shape[0] == self.bb.width()
assert labels.shape[1] == self.bb.height()
##
## ensure that at least one pixel is label when the brush size is 1
##
## this happens when the user just clicked without moving
## in that case the lineitem will be so tiny, that it won't be rendered
## into a single pixel by the code above
if not has_moved and self.brushSize <= 1 and numpy.count_nonzero(labels) == 0:
labels[labels.shape[0]//2, labels.shape[1]//2] = self.drawnNumber
self.brushStrokeAvailable.emit(QPointF(self.bb.x(), self.bb.y()), labels)
def dumpDraw(self, pos):
res = self.endDrawing(pos)
self.beginDrawing(pos, self.sliceRect)
return res
def moveTo(self, pos):
#data coordinates
oldX, oldY = self.pos.x(), self.pos.y()
x,y = pos.x(), pos.y()
line = QGraphicsLineItem(oldX, oldY, x, y)
line.setPen(QPen( QBrush(Qt.white), self.brushSize, Qt.SolidLine, Qt.RoundCap, Qt.RoundJoin))
self.scene.addItem(line)
self._hasMoved = True
#update bounding Box
if not self.bb.isValid():
self.bb = QRect(QPoint(oldX,oldY), QSize(1,1))
#grow bounding box
self.bb.setLeft( min(self.bb.left(), max(0, x-self.brushSize//2-1) ) )
self.bb.setRight( max(self.bb.right(), min(self.sliceRect[0]-1, x+self.brushSize//2+1) ) )
self.bb.setTop( min(self.bb.top(), max(0, y-self.brushSize//2-1) ) )
self.bb.setBottom(max(self.bb.bottom(), min(self.sliceRect[1]-1, y+self.brushSize//2+1) ) )
#update/move position
self.pos = pos