标签：20 Qt randint self random PyQt5 绘图 painter

QPainter

功能：QPainter实现在QWidget上画图功能

说明：绘图必须在paintEvent中完成，且要在bengin和end之间作图

接口：

QPen

功能：画笔，主要是设置线条的格式和颜色

QBrush

功能：画刷，主要是设置填充的格式和颜色

例子

import random
import string
import sys

from PyQt5.QtCore import Qt, QRect
from PyQt5.QtGui import QPainter, QFont, QColor, QPen, QBrush
from PyQt5.QtWidgets import QApplication, QWidget

class MyWidget(QWidget):
    def __init__(self):
        super(MyWidget, self).__init__()

    # def paintEvent(self, QPaintEvent):
    #     painter = QPainter(self)
    #     painter.begin(self)
    #     painter.setFont(QFont('Courier New', 20))
    #     painter.setPen(QColor(168, 34, 3))
    #     painter.drawText(QPaintEvent.rect(), Qt.AlignCenter, 'hello world')
    #     painter.end()

    # def paintEvent(self, QPaintEvent):
    #     painter = QPainter(self)
    #     painter.begin(self)
    #     painter.setFont(QFont('Courier New', 20))
    #     painter.setPen(QColor(168, 34, 3))
    #
    #     for i in range(10000):
    #             painter.drawPoint(random.randint(0, 300), random.randint(0, 300))
    #
    #     painter.end()

    # def paintEvent(self, QPaintEvent):
    #     painter = QPainter(self)
    #     painter.begin(self)
    #
    #     pen = QPen(Qt.red, 2, Qt.SolidLine)
    #     painter.setPen(pen)
    #     painter.drawLine(20, 20, 400, 20)
    #
    #     pen.setStyle(Qt.DashDotLine)
    #     painter.setPen(pen)
    #     painter.drawLine(20, 40, 400, 40)
    #
    #     painter.end()

    # def paintEvent(self, QPaintEvent):
    #     painter = QPainter(self)
    #     painter.begin(self)
    # 
    #     brush = QBrush(Qt.SolidPattern)
    #     brush.setColor(Qt.green)
    #     painter.setBrush(brush)
    #     painter.drawRect(20, 20, 200, 100)
    # 
    #     brush = QBrush(Qt.HorPattern)
    #     brush.setColor(Qt.red)
    #     painter.setBrush(brush)
    #     painter.drawRect(20, 140, 200, 100)
    # 
    #     painter.end()

    # 实现随机验证码
    def paintEvent(self, QPaintEvent):
        painter = QPainter(self)
        painter.begin(self)
        painter.setFont(QFont('Courier New', 50))
        randomString = "".join([random.choice(string.digits + string.ascii_letters) for i in range(10)])
        for i in range(len(randomString)):
            painter.setPen(QColor(random.randint(0, 255), random.randint(0, 255), random.randint(0, 255)))
            painter.drawText(50 + i * 40, 150, randomString[i])

        for i in range(25000):
            painter.setPen(QColor(random.randint(0, 255), random.randint(0, 255), random.randint(0, 255)))
            painter.drawPoint(random.randint(0, 500), random.randint(0, 300))

        painter.end()

if __name__ == '__main__':
    app = QApplication(sys.argv)
    w = MyWidget()
    w.resize(500, 300)
    w.move(300, 300)
    w.setWindowTitle('Simple')
    w.show()
    sys.exit(app.exec_())

标签：20,Qt,randint,self,random,PyQt5,绘图,painter
来源： https://www.cnblogs.com/chusiyong/p/12926131.html

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