如何检测在pyside中绘制的椭圆上的鼠标单击？

Question

I am using QPainter within a QWidget to draw a bunch of ellipses on a black background as follows:

paint = QPainter()
paint.begin(self)

paint.setBrush(Qt.black)
paint.drawRect(event.rect())

brush = ...
paint.setBrush(brush)
paint.drawEllipse(center, rad, rad)

After a bunch of ellipses were drawn, and then I want to detect a mouse click on one of such an existing ellipse. I did not find any obvious in the documentation for QPainter .

In case there is something else to be used instead of QPainter , please provide an example that shows my above example in the other framework.

Answer 1

You will need to detect the custom area yourself as follows:

def mousePressEvent(self, event):
    ''' You will have to implement the contain algorithm yourself'''
    if sel.fo(even.pos()):
        self.myMethod()

QGraphicsEllipseItem.contains()

Alternatively, you could look into the QGraphicsEllipseItem because it has the contains-logic implemented and offered .

def mousePressEvent(self, event):
    if self.contains(event.pos()):
        self.myMethod()

and you create your object with the corresponding parameters:

scene = QGraphicsScene()
ellipseItem = MyGraphicsEllipseItem(centerx, centery, rad, rad)
scene.addItem(ellipseItem)

view = QGraphicsView(scene)
view.show()

scene.setBackgroundBrush(Qt.black)