PyQt5绘图多条折线图

在PyQt5中实现绘制多条折线图的方法如下：
1. 导入PyQt5的相应模块：

from PyQt5.QtWidgets import *
from PyQt5.QtGui import QPainter, QPen
from PyQt5.QtCore import Qt

2. 创建继承自QWidget的自定义类，重写其paintEvent方法：

class Demo(QWidget):
    def __init__(self, parent=None):
        super(Demo, self).__init__(parent)
        self.setWindowTitle("PyQt5绘制多条折线图")
        self.resize(400, 300)

    def paintEvent(self, event):
        painter = QPainter(self)
        pen = QPen(Qt.black, 2, Qt.SolidLine)
        painter.setPen(pen)

        points_list = [[50, 50], [100, 150], [150, 100], [200, 200], [250, 150], [300, 250]]
        
        for i in range(len(points_list) - 1):
            x1, y1 = points_list[i]
            x2, y2 = points_list[i + 1]
            painter.drawLine(x1, y1, x2, y2)

3. 创建QApplication对象并运行应用程序：

if __name__ == "__main__":
    import sys
    app = QApplication(sys.argv)
    demo = Demo()
    demo.show()
    sys.exit(app.exec_())

以上代码实现了在窗口中绘制了多条折线图，折线图的坐标点分别为[[50, 50], [100, 150], [150, 100], [200, 200], [250, 150], [300, 250]]。每两个坐标点之间使用drawLine方法绘制一条直线。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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