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edge.py
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edge.py
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from PyQt5.QtCore import QLineF, QPointF, Qt
from PyQt5.QtWidgets import QGraphicsLineItem, QGraphicsItem, QApplication
from PyQt5.QtGui import QPen
def closestPointTo(point, path):
target = path.boundingRect().center()
mid = (point + target) / 2.
if path.contains(mid):
return mid
else:
while (mid-point).manhattanLength() > 1:
while not path.contains(mid) :
point = mid
mid = (point + target) / 2.
while path.contains(mid) :
mid = (point + mid) /2.
return mid
class GraphicsEdge(QGraphicsLineItem):
def __init__(self, startNode, endNode):
QGraphicsLineItem.__init__(self)
self.setPen(QPen())
self.startNode = startNode
self.endNode = endNode
self.startNode.addObserver(self)
self.endNode.addObserver(self)
startShape = self.startNode.mapToScene(self.startNode.shape())
endShape = self.endNode.mapToScene(self.endNode.shape())
p1 = closestPointTo(endShape.boundingRect().center(), startShape)
p2 = closestPointTo(startShape.boundingRect().center(), endShape)
self.setLine(QLineF(p1, p2))
self.setFlags(QGraphicsItem.ItemIsSelectable)
def mousePressEvent(self, e):
modifiers = QApplication.keyboardModifiers()
if modifiers == Qt.NoModifier:
for item in self.scene().selectedItems():
item.setSelected(False)
self.setSelected(True)
def obsUpdate(self):
startShape = self.startNode.mapToScene(self.startNode.shape())
endShape = self.endNode.mapToScene(self.endNode.shape())
p1 = closestPointTo(endShape.boundingRect().center(), startShape)
p2 = closestPointTo(startShape.boundingRect().center(), endShape)
self.setLine(QLineF(p1, p2))
class GraphicsSemiEdge(QGraphicsLineItem):
def __init__(self, startNode, endNode):
QGraphicsLineItem.__init__(self)
self.setPen(QPen())
self.startNode = startNode
self.endNode = endNode
self.startNode.addObserver(self)
startShape = self.startNode.mapToScene(self.startNode.shape())
p1 = closestPointTo(self.endNode, startShape)
self.setLine(QLineF(p1, self.endNode))
def obsUpdate(self, p2=None):
if p2 != None:
startShape = self.startNode.mapToScene(self.startNode.shape())
self.endNode = p2
p1 = closestPointTo(self.endNode, startShape)
self.setLine(QLineF(p1, self.endNode))