How to draw a rectangle and adjust its shape by drag and drop in PyQt5

Question

I\'m trying to draw a rectangle on GUI created by PyQt5 by drag and drop. I managed to do that, but the rectangle is drawn when the mouse left key is released.

What

Answer 1

You do not have to use the mouseReleaseEvent function, but the mouseMoveEvent function that is called each time the mouse is moved, and I have modified the code to make it simpler.

class MyWidget(QtWidgets.QWidget):
    def __init__(self):
        super().__init__()
        self.setGeometry(30,30,600,400)
        self.begin = QtCore.QPoint()
        self.end = QtCore.QPoint()
        self.show()

    def paintEvent(self, event):
        qp = QtGui.QPainter(self)
        br = QtGui.QBrush(QtGui.QColor(100, 10, 10, 40))  
        qp.setBrush(br)   
        qp.drawRect(QtCore.QRect(self.begin, self.end))       

    def mousePressEvent(self, event):
        self.begin = event.pos()
        self.end = event.pos()
        self.update()

    def mouseMoveEvent(self, event):
        self.end = event.pos()
        self.update()

    def mouseReleaseEvent(self, event):
        self.begin = event.pos()
        self.end = event.pos()
        self.update()