判断点击事件中的哪个椭圆

Question

我是 python 和 PyQT 的新手，并且被卡住了。如果我的代码有点乱，我深表歉意。我花了很多时间搜索，但还没有找到任何对我的情况有帮助的东西。

我正在尝试确定单击了哪个椭圆。

我基本上有一个部分在圆圈中创建椭圆并根据列表数组中的值在其上打印文本：

class MyFrame(QtWidgets.QGraphicsView):
    def __init__(self, parent = None ):
        super(MyFrame, self).__init__(parent)

        self.setScene(QtWidgets.QGraphicsScene())
        self.setBackgroundBrush(QtGui.QColor(QtCore.Qt.darkGray))
        self.setRenderHints(self.renderHints() | QtGui.QPainter.Antialiasing  | QtGui.QPainter.SmoothPixmapTransform)

        arLights = list( {} for i in xrange(12) )
        circX = 0
        circY = 0
        maxX = 0
        maxY = 0
        i = 0
        pen = QtGui.QPen(QtGui.QColor(QtCore.Qt.lightGray).darker(50))
        brush = QtGui.QBrush(QtGui.QColor(QtCore.Qt.lightGray))
        font = QtGui.QFont('White Rabbit')
        font.setPointSize(12)

        arLights = getLights()

        theta = radians(360)
        columns = len(filter(None, arLights))
        alpha = theta / columns

        for a in range(columns):
            angle = a * alpha
            circX = (w + x) * cos(angle)
            circY = (h + y) * sin(angle)

            item = callbackEllipse(circX, circY, w, h) #(x+xi*(w+x), y+yi*(h+y), w, h)
            item.setAcceptHoverEvents(True)
            item.setPen(pen)
            item.setBrush(brush)
            self.scene().addItem(item)
            item.setFlag(QtWidgets.QGraphicsItem.ItemIsMovable)
            self.writeText(arrLight[i]['name'], circX + (w / 4), circY + (h * 0.75))
            i = i + 1

这是我的 mouseReleaseEvent，然后我尝试使用我用来布置它们的相同公式计算出与该椭圆关联的名称。

class callbackEllipse(QtWidgets.QGraphicsEllipseItem):
    def mouseReleaseEvent(self, event):
        # recolor on click
        color = QtGui.QColor(QtCore.Qt.lightGray)
        brush = QtGui.QBrush(color)
        QtWidgets.QGraphicsEllipseItem.setBrush(self, brush)

        theta = radians(360)
        alpha = theta / arrRange

        arrLights = getLights()
        for a in xrange(0, len(filter(None, arrLights))):
            if (event.scenePos().x() > ((w + x) * cos(a * alpha))
                and event.scenePos().x() < (((w + x) * cos(a * alpha)) + w)
                and event.screenPos().y() < ((h + y) * sin(a * alpha))
                and event.screenPos().y() < (((h + y) * sin(a * alpha)) + h)
                ):
                print(arrLights[a]['name'])
                break

        return QtWidgets.QGraphicsEllipseItem.mouseReleaseEvent(self, event)

这不符合预期。我试过 .sceenPos() .screenPos() 和 .pos() 但它们似乎与我创建椭圆时的坐标不匹配，导致它识别错误的关联文本或找不到完全匹配。

任何人都可以帮助我识别椭圆或者为什么我的代码没有按照我想要的方式工作？好像没有办法'name'他们，那会更容易。

Answer 1

不要不必要地工作 2 次，保存值引用并打印它，因为 mouseReleaseEvent() 只有在按下项目时才会调用：

import math
from PyQt5 import QtCore, QtGui, QtWidgets

def getLights():
    return [{"name": str(i)} for i in range(10)]

class CallbackEllipse(QtWidgets.QGraphicsEllipseItem):
    def __init__(self, light, *args, **kwargs):
        super(CallbackEllipse, self).__init__(*args, **kwargs)
        self._light = light

    def mouseReleaseEvent(self, event):
        color = QtGui.QColor(QtCore.Qt.lightGray)
        brush = QtGui.QBrush(color)
        self.setBrush(brush)    
        print(self._light["name"])
        super(CallbackEllipse, self).mouseReleaseEvent(event)

class MyFrame(QtWidgets.QGraphicsView):
    def __init__(self, parent=None):
        super(MyFrame, self).__init__(parent)

        self.setScene(QtWidgets.QGraphicsScene(self))
        self.setBackgroundBrush(QtGui.QColor(QtCore.Qt.darkGray))
        self.setRenderHints(self.renderHints() | QtGui.QPainter.Antialiasing  | QtGui.QPainter.SmoothPixmapTransform)

        arLights = getLights()

        theta = math.radians(360)
        filter_lights = list(filter(None, arLights)) 
        num_of_columns = len(filter_lights)
        delta = theta/num_of_columns
        circX, circY = 0, 0
        w, h, x, y = 100, 100, 100, 100

        pen = QtGui.QPen(QtGui.QColor(QtCore.Qt.lightGray).darker(50))
        brush = QtGui.QBrush(QtGui.QColor(QtCore.Qt.lightGray))

        for i, light in enumerate(filter_lights):
            angle = i*delta
            circX = (w + x) * math.cos(angle)
            circY = (h + y) * math.sin(angle)
            item = CallbackEllipse(light, circX, circY, w, h)
            item.setAcceptHoverEvents(True)
            item.setPen(pen)
            item.setBrush(brush)
            item.setFlag(QtWidgets.QGraphicsItem.ItemIsMovable)
            self.scene().addItem(item)

if __name__ == '__main__':
    import sys
    app = QtWidgets.QApplication(sys.argv)
    w = MyFrame()
    w.show()
    sys.exit(app.exec_())

判断点击事件中的哪个椭圆

Determine which ellipse in click event

python

pyqt

pyqt5

qgraphicsview

qgraphicsscene