/
graph_scene.py
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/
graph_scene.py
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from PyQt5.QtWidgets import QGraphicsScene, QGraphicsObject
from PyQt5.QtGui import QColor, QBrush, QTransform, QPainter, QPen
from PyQt5.QtCore import pyqtSignal, QPointF, QLineF, Qt
from graph_arrow import GraphArrow
from control_point import ControlPoint
from qt_tools import simpleMaxContrastingColor
class GraphScene(QGraphicsScene):
backgroundDoubleClicked = pyqtSignal(QPointF)
mousePressed = pyqtSignal(QPointF)
dragStarted = pyqtSignal(list, QPointF)
dragEnded = pyqtSignal(list, QPointF)
backgroundColorChanged = pyqtSignal(QColor)
itemsPlaced = pyqtSignal(list)
def __init__(self, new=True):
super().__init__()
self._placeItems = None
self._moveItems = None
self._contextMenu = None
if new:
self.setBackgroundBrush(QBrush(QColor(150,150,150)))
self._gridSizeX = 14
self._gridSizeY = 14
self._gridEnabled = False
self._gridOrigin = QPointF()
self._pickGridOrigin = False
self._editor = None
self._placing = False
self._menuEventPos = QPointF()
def setEditor(self, editor):
self._editor = editor
def editor(self):
return self._editor
def setContextMenu(self, menu):
self._contextMenu = menu
def contextMenu(self):
return self._contextMenu
def __setstate__(self, data):
self.__init__(new=False)
self.setBackgroundBrush(QBrush(data['background color']))
def __getstate__(self):
return {
'background color' : self.backgroundBrush().color(),
}
def mouseDoubleClickEvent(self, event):
self.backgroundDoubleClicked.emit(event.scenePos())
super().mouseDoubleClickEvent(event)
def placeItems(self, items, pos=None, add=False):
if not isinstance(items, list):
items = [items]
if pos is not None:
for item in items:
item.setPos(pos)
if add:
for item in items:
self.addItem(item)
self._placeItems = items
self._placing = True
def mousePressEvent(self, event):
if self._pickGridOrigin:
self._gridOrigin = event.scenePos()
self.update()
self._pickGridOrigin = False
return
if not self._placeItems:
if not self._moveItems:
item = self.itemAt(event.scenePos(), QTransform())
if item:
if isinstance(item, ControlPoint):
self._placeItems = [item]
pos = event.scenePos()
self.dragStarted.emit(self._placeItems, pos)
for item in self._placeItems:
if hasattr(item, 'mouseDragBegan'):
item.mouseDragBegan.emit(pos)
else:
pos = event.scenePos()
self.dragEnded.emit(self._moveItems, pos)
for item in self._moveItems:
if hasattr(item, 'mouseDragEnded'):
item.mouseDragEnded.emit(pos)
self._moveItems = None
super().mousePressEvent(event)
def mouseReleaseEvent(self, event):
if self._moveItems:
pos = event.scenePos()
self.dragEnded.emit(self._moveItems, pos)
for item in self._moveItems:
if hasattr(item, 'mouseDragEnded'):
item.mouseDragEnded.emit(pos)
if self._placing:
self.itemsPlaced.emit(self._moveItems)
self._placing = False
self._moveItems = None
super().mouseReleaseEvent(event)
def mouseMoveEvent(self, event):
if self._placeItems:
self._moveItems = []
children = []
for item in self._placeItems:
children += item.childItems()
for item in self._placeItems:
if item not in children:
self._moveItems.append(item)
else:
item.setSelected(False)
self._placeItems = None
if self._moveItems:
delta = event.scenePos() - event.lastScenePos()
for item in self._moveItems:
item.setPos(item.pos() + delta)
super().mouseMoveEvent(event)
def menuEventScenePos(self):
return self._menuEventPos
def contextMenuEvent(self, event):
self._menuEventPos = event.scenePos()
item = self.itemAt(event.scenePos(), QTransform())
if self._contextMenu and item is None:
self._contextMenu.exec_(event.screenPos())
else:
super().contextMenuEvent(event)
def drawBackground(self, painter, rect):
super().drawBackground(painter, rect)
if self._gridEnabled:
painter.setRenderHints(QPainter.Antialiasing)
painter.setPen(QPen(simpleMaxContrastingColor(self.backgroundBrush().color()), 0.4))
points = [] # Adding to a list and then drawing is much faster
o = self._gridOrigin
ox = o.x() % self._gridSizeX
oy = o.y() % self._gridSizeY
left = int(rect.left()) - (int(rect.left()) % self._gridSizeX)
top = int(rect.top()) - (int(rect.top()) % self._gridSizeY)
for x in range(left, int(rect.right()), self._gridSizeX):
for y in range(top, int(rect.bottom()), self._gridSizeY):
points.append(QPointF(x + ox, y + oy))
if points:
painter.drawPoints(*points)
# Draw grid origin
painter.drawLine(QLineF(o.x(), o.y() - 20, o.x(), o.y() + 20))
painter.drawLine(QLineF(o.x() - 20, o.y(), o.x() + 20, o.y()))
def setXGridSize(self, size):
self._gridSizeX = size
self.update()
def setYGridSize(self, size):
self._gridSizeY = size
self.update()
def setGridSize(self, size):
self._gridSizeX = size
self._gridSizeY = size
self.update()
def setGridEnabled(self, enable):
self._gridEnabled = enable
self.update()
def gridEnabled(self):
return self._gridEnabled
def setPickGridOrigin(self, pick):
self._pickGridOrigin = pick
def gridSizeX(self):
return self._gridSizeX
def gridSizeY(self):
return self._gridSizeY
def gridOrigin(self):
return self._gridOrigin
def setBackgroundBrush(self, brush):
super().setBackgroundBrush(brush)
self.backgroundColorChanged.emit(brush.color())
def updateAllArrows(self):
for item in self.items():
if isinstance(item, GraphArrow):
item.updatePosition()
self.update()