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   源码介绍

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# -*- coding: utf-8 -*-
 
"""
PyQt5 tutorial
 
In the example, we draw randomly 1000 red points
on the window.
 
author: py40.com
last edited: 2017年3月
"""
import sys, random
from PyQt5.QtWidgets import QWidget, QApplication
from PyQt5.QtGui import QPainter, QColor, QPen
from PyQt5.QtCore import Qt
 
 
class Example(QWidget):
    def __init__(self):
        super().__init__()
 
        self.initUI()
 
    def initUI(self):
        self.setGeometry(300, 300, 280, 170)
        self.setWindowTitle('Points')
        self.show()
 
    def paintEvent(self, e):
        qp = QPainter()
        qp.begin(self)
        self.drawPoints(qp)
        qp.end()
 
    def drawPoints(self, qp):
        qp.setPen(Qt.red)
        size = self.size()
 
        for i in range(1000):
            x = random.randint(1, size.width() - 1)
            y = random.randint(1, size.height() - 1)
            qp.drawPoint(x, y)
 
 
if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = Example()
    sys.exit(app.exec_())