小编pot*_*ny3的帖子

我正在尝试通过拖放在PyQt5创建的GUI上绘制一个矩形.我设法做到了,但是当鼠标左键被释放时绘制了矩形.

我想要做的就像这个链接:

• 按下鼠标左键时,开始绘制矩形.
• 拖动时,使用鼠标移动调整矩形形状.
• 释放鼠标左键时,确定矩形形状.

我该如何实现呢？提前致谢.

这是我的代码.

# -*- coding: utf-8 -*-

import sys
from PyQt5 import QtWidgets, QtCore
from PyQt5.QtGui import QPainter

class MyWidget(QtWidgets.QWidget):
    def __init__(self):
        super().__init__()
        self.setGeometry(30,30,600,400)
        self.pos1 = [0,0]
        self.pos2 = [0,0]
        self.show()

    def paintEvent(self, event):
        width = self.pos2[0]-self.pos1[0]
        height = self.pos2[1] - self.pos1[1]     

        qp = QPainter()
        qp.begin(self)           
        qp.drawRect(self.pos1[0], self.pos1[1], width, height)        
        qp.end()

    def mousePressEvent(self, event):
        self.pos1[0], self.pos1[1] = event.pos().x(), event.pos().y()
        print("clicked")

    def mouseReleaseEvent(self, event):
        self.pos2[0], self.pos2[1] = event.pos().x(), event.pos().y()
        print("released")
        self.update()

if __name__ == …