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import sys,math,randomfrom PyQt5.QtWidgets import *from PyQt5.QtCore import *from PyQt5.QtGui import *class DrawPoints(QWidget):    def __init__(self):        super(DrawPoints, self).__init__()        self.resize(300,300)        self.setWindowTitle('正弦曲线')    def paintEvent(self, event):        painter = QPainter(self)        painter.begin(self)        painter.setPen(Qt.blue)        size = self.size()        for i in range(1000):            x =100*(-1+2.0 * i/1000)+size.width()/2.0            #T = 50            y = -50 * math.sin((x -size.width()/2.0) * math.pi/50) +size.height()/2.0            painter.drawPoint(x,y)        painter.end()if __name__ == '__main__':    app =QApplication(sys.argv)    main = DrawPoints()    main.show()    sys.exit(app.exec_())

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