PYQT5写字板

PYQT5写字板需要先安装pyqt5，打开cmd，输入pip install pyqt5
import sysfrom PyQt5.QtWidgets import (QApplication, QWidget)from PyQt5.QtGui import (QPainter, QPen,QIcon)from PyQt5.QtCore import Qtclass 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_()