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graphic_items.py
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from PyQt5.QtWidgets import QGraphicsItem, QGraphicsLineItem
from PyQt5.QtGui import QBrush, QPen, QColor
from PyQt5.QtCore import Qt, QRectF, QPoint
class Node(QGraphicsItem):
def __init__(self, x, y, color=None):
super().__init__()
self.setAcceptHoverEvents(True)
self.center = QPoint(x, y)
self.onFocus = False
self.clicked = False
self.type = 'node'
self.key = -1
self.radius = 15
if color:
self.color = color
else:
self.color = QColor(255, 0, 0)
self.focusColor = QColor(255, 153, 51)
self.clickedColor = QColor(255, 255, 0)
self.outlineColor = QColor(153, 0, 0)
def paint(self, painter, styleoptions, widget=None):
if self.clicked:
painter.setBrush(QBrush(self.clickedColor))
elif self.onFocus:
painter.setBrush(QBrush(self.focusColor))
else:
painter.setBrush(QBrush(self.color))
painter.setPen(QPen(self.outlineColor))
painter.drawEllipse(self.center, self.radius, self.radius)
def setPenColor(self, color):
self.color = QColor(color[0], color[1], color[2])
def addMask(self):
self.color.setAlpha(50)
self.focusColor.setAlpha(50)
self.clickedColor.setAlpha(50)
self.outlineColor.setAlpha(50)
def removeMask(self):
self.color.setAlpha(255)
self.focusColor.setAlpha(255)
self.clickedColor.setAlpha(255)
self.outlineColor.setAlpha(255)
def boundingRect(self):
return QRectF(self.center.x() - self.radius, self.center.y() - self.radius, 2 * self.radius, 2 * self.radius)
def hoverEnterEvent(self, event):
self.onFocus = True
self.update()
def hoverLeaveEvent(self, event):
self.onFocus = False
self.update()
class Edge(QGraphicsLineItem):
def __init__(self, fromNode, toNode, color=None):
self.fromNode = fromNode
self.toNode = toNode
if toNode:
self.endx = toNode.center.x()
self.endy = toNode.center.y()
else:
self.endx = fromNode.center.x()
self.endy = fromNode.center.y()
super().__init__(fromNode.center.x(), fromNode.center.y(), self.endx, self.endy)
self.setPen(QPen(Qt.black, 5))
self.setZValue(-1)
self.type = 'edge'
self.clicked = False
self.setAcceptHoverEvents(True)
self.onFocus = False
if color:
self.color = color
else:
self.color = QColor(0, 0, 0)
self.focusColor = QColor(0, 100, 100)
self.clickedColor = QColor(0, 204, 204)
self.width = 6
def setEnd(self, x, y):
self.setLine(self.fromNode.center.x(), self.fromNode.center.y(), x, y)
def setPenColor(self, color):
self.color = QColor(color[0], color[1], color[2])
def addMask(self):
self.color.setAlpha(50)
self.focusColor.setAlpha(50)
self.clickedColor.setAlpha(50)
self.outlineColor.setAlpha(50)
def removeMask(self):
self.color.setAlpha(255)
self.focusColor.setAlpha(255)
self.clickedColor.setAlpha(255)
self.outlineColor.setAlpha(255)
def paint(self, painter, styleoptions, widget=None):
if self.clicked:
pen = QPen(self.clickedColor)
elif self.onFocus:
pen = QPen(self.focusColor)
else:
pen = QPen(self.color)
pen.setCapStyle(Qt.RoundCap)
pen.setWidth(self.width)
self.setPen(pen)
super().paint(painter, styleoptions, widget)
def hoverEnterEvent(self, event):
self.onFocus = True
self.update()
def hoverLeaveEvent(self, event):
self.onFocus = False
self.update()