用pycharm编写简单的鼠标绘图软件

好的，下面是一个简单的鼠标绘图软件的代码，基于PyQt5库实现：

import sys
from PyQt5.QtGui import QPainter, QColor, QPen
from PyQt5.QtWidgets import QApplication, QMainWindow, QWidget
from PyQt5.QtCore import Qt, QPoint

class MyCanvas(QWidget):
    def __init__(self):
        super().__init__()
        self.initUI()

    def initUI(self):
        self.setGeometry(100, 100, 800, 600)
        self.setWindowTitle('My Canvas')
        self.image = QImage(self.size(), QImage.Format_RGB32)
        self.image.fill(Qt.white)
        self.drawing = False
        self.brushSize = 2
        self.brushColor = Qt.black
        self.lastPoint = QPoint()

    def paintEvent(self, event):
        painter = QPainter(self)
        painter.drawImage(self.rect(), self.image, self.image.rect())

    def mousePressEvent(self, event):
        if event.button() == Qt.LeftButton:
            self.drawing = True
            self.lastPoint = event.pos()

    def mouseMoveEvent(self, event):
        if event.buttons() and Qt.LeftButton and self.drawing:
            painter = QPainter(self.image)
            painter.setPen(QPen(self.brushColor, self.brushSize, Qt.SolidLine, Qt.RoundCap, Qt.RoundJoin))
            painter.drawLine(self.lastPoint, event.pos())
            self.lastPoint = event.pos()
            self.update()

    def mouseReleaseEvent(self, event):
        if event.button() == Qt.LeftButton:
            self.drawing = False

class MainWindow(QMainWindow):
    def __init__(self):
        super().__init__()
        self.canvas = MyCanvas()
        self.setCentralWidget(self.canvas)
        self.initUI()

    def initUI(self):
        self.setGeometry(100, 100, 800, 600)
        self.setWindowTitle('My Paint')
        self.show()

if __name__ == '__main__':
    app = QApplication(sys.argv)
    window = MainWindow()
    sys.exit(app.exec_())

这个程序使用了PyQt5库，创建了一个窗口并在其中添加了一个自定义的QWidget类MyCanvas，用来绘制图形。在MyCanvas类中实现了绘制图形的功能，包括鼠标事件的处理和绘图操作的实现。在MainWindow类中将MyCanvas类添加到窗口中，并显示窗口。