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   源码介绍

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PYQT5写字板

需要先安装pyqt5，打开cmd，输入pip install pyqt5

import sys
from PyQt5.QtWidgets import (QApplication, QWidget)
from PyQt5.QtGui import (QPainter, QPen,QIcon)
from PyQt5.QtCore import Qt

class Example(QWidget):
    def __init__(self):
        super(Example, self).__init__()
        self.resize(960,540)
        self.move(100, 100)
        self.setWindowTitle("PyQt5写字板")
        self.setWindowIcon(QIcon('ico.ico'))
        self.setMouseTracking(False)
        self.pos_xy = []

    def paintEvent(self, event):
        painter = QPainter()
        painter.begin(self)
        pen = QPen(Qt.black,2,Qt.SolidLine)
        painter.setPen(pen)
        if len(self.pos_xy) > 1:
            point_start = self.pos_xy[0]
            for pos_tmp in self.pos_xy:
                point_end = pos_tmp

                if point_end == (-1, -1):
                    point_start = (-1, -1)
                    continue
                if point_start == (-1, -1):
                    point_start = point_end
                    continue

                painter.drawLine(point_start[0], point_start[1], point_end[0], point_end[1])
                point_start = point_end
        painter.end()

    def mouseMoveEvent(self, event):
        pos_tmp = (event.pos().x(), event.pos().y())
        self.pos_xy.append(pos_tmp)
        self.update()

    def mouseReleaseEvent(self, event):
        pos_test = (-1, -1)
        self.pos_xy.append(pos_test)
        self.update()

if __name__ == "__main__":
    app = QApplication(sys.argv)
    pyqt_learn = Example()
    pyqt_learn.show()
    app.exec_()