【Python matplotlib】鼠标右键移动画布

在 Matplotlib 中，鼠标右键移动画布的功能通常是通过设置交互模式来实现的，例如使用 mpl_connect 方法。以下是一个示例代码，展示如何在 Matplotlib 中使用 mpl_connect 方法来实现鼠标右键移动画布的功能：

import numpy as np
import matplotlib.pyplot as plt
import matplotlib

matplotlib.use('TkAgg')

class PanCanvas:
    def __init__(self, ax):
        self.ax = ax
        self.press = None
        self.x0 = None
        self.y0 = None

        self.ax.figure.canvas.mpl_connect('button_press_event', self.on_press)
        self.ax.figure.canvas.mpl_connect('button_release_event', self.on_release)
        self.ax.figure.canvas.mpl_connect('motion_notify_event', self.on_motion)

    def on_press(self, event):
        if event.button == 3:  # Right mouse button
            self.press = event.xdata, event.ydata
            self.x0 = self.ax.get_xlim()
            self.y0 = self.ax.get_ylim()

    def on_release(self, event):
        if self.press is not None:
            self.press = None
            self.ax.figure.canvas.draw()

    def on_motion(self, event):
        if self.press is None:
            return
        if event.button == 3:  # Right mouse button
            x_press, y_press = self.press
            dx = event.xdata - x_press
            dy = event.ydata - y_press
            self.ax.set_xlim(self.x0[0] - dx, self.x0[1] - dx)
            self.ax.set_ylim(self.y0[0] - dy, self.y0[1] - dy)
            self.ax.figure.canvas.draw()

def main():
    # 创建一个绘图窗口和一个子图
    fig, ax = plt.subplots()
    ax.set_xlim(0, 10)
    ax.set_ylim(0, 10)

    # 绘制一些示例数据
    x = np.linspace(0, 10, 100)
    y = np.sin(x)
    line, = ax.plot(x, y)

    # 创建 PanCanvas 对象
    pan_canvas = PanCanvas(ax)

    plt.show()

if __name__ == "__main__":
    main()