我正在嘗試創(chuàng)建自己的圖形項(xiàng)目，其中心有一個(gè)圓圈及其標(biāo)簽。class circle(QGraphicsItem): def __init__(self, radius=None, name=None, x=None, y=None, parent=None): super(circle, self).__init__(parent) self.radius = radius if radius else random.random()*500 self.label = name if name else "cirA" self.x = x if x else random.randint(0, 900) self.y = y if y else random.randint(0, 600) # self.center = complex(self.x, self.y) def boundingRect(self): penWidth = 1.0 return QRectF(-self.x - penWidth / 2, -self.y - penWidth / 2, self.x + penWidth, self.y + penWidth) def paint(self, painter, option, widget): painter.drawEllipse(0, 0, self.radius, self.radius) painter.drawText(self.label)現(xiàn)在在我的主GUI中，一個(gè)圓圈列表被保存為circleList，我正在嘗試將圓圈項(xiàng)目添加為for cir in self.circleList: self.painter.addItem(cir)但這會返回RuntimeError: wrapped C/C++ object of type circle has been deleted幫助？這應(yīng)該可以完成最小可復(fù)制示例的技巧注意：FBS是必需的，項(xiàng)目應(yīng)使用fbs startproject該圓圈也將與以下內(nèi)容一起添加from fbs_runtime.application_context.PyQt5 import ApplicationContextfrom PyQt5.QtWidgets import *from PyQt5.QtGui import *from PyQt5.QtCore import *class gui(QDialog): def __init__(self, parent=None): super(gui, self).__init__(parent) self.painter = QGraphicsScene(10, 10, 900, 600) self.canvas = QGraphicsView(self.painter) mainLayout = QGridLayout() mainLayout.addWidget(self.canvas, 0, 0, 6, 2) self.setLayout(mainLayout) self.circleList = [] def drawCircle(self): pen = QPen(Qt.black, 2, Qt.SolidLine) self.painter.clear() for cir in self.circleList: self.painter.addItem(cir) self.painter.update() self.canvas.update() self.update() def newCircle(self, cir): self.circleList.append(cir) self.drawCircle() def addCircle(self): return self.newCircle(circle())
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TA貢獻(xiàn)1786條經(jīng)驗(yàn) 獲得超13個(gè)贊
圖形視圖框架不需要您刪除和添加項(xiàng)目。在你的例子中，當(dāng)使用 clear（） 時(shí)，你正在從場景中刪除項(xiàng)目，并且你正在從內(nèi)存中刪除它們，所以 circleList 將具有不再分配內(nèi)存的變量。
另一方面，如果你想要一個(gè)自定義的QGraphicsItem，在中心繪制一個(gè)圓圈和一個(gè)文本，那么 boundingRect必須具有矩形的大小。
考慮到上述情況，解決方案如下：
class Circle(QGraphicsItem):
def __init__(self, radius=None, name="", x=0, y=0, parent=None):
super(Circle, self).__init__(parent)
self.radius = radius or random.random() * 500
self.label = name if name else "cirA"
self.setPos(x or random.randint(0, 900), y or random.randint(0, 900))
def boundingRect(self):
return QRectF(0, 0, self.radius, self.radius)
def paint(self, painter, option, widget):
painter.drawEllipse(0, 0, self.radius, self.radius)
painter.drawText(0, 0, self.radius, self.radius, Qt.AlignCenter, self.label)
class Gui(QDialog):
def __init__(self, parent=None):
super(Gui, self).__init__(parent)
self.painter = QGraphicsScene(10, 10, 900, 600)
self.canvas = QGraphicsView(self.painter)
mainLayout = QGridLayout(self)
mainLayout.addWidget(self.canvas)
@property
def circleList(self):
return [item for item in self.painter.items() if isinstance(item, Circle)]
def newCircle(self, cir):
self.painter.addItem(cir)
return cir
def addCircle(self):
return self.newCircle(Circle())
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