matplotlib 鼠标拖动坐标图像/鼠标滑轮放大缩小坐标图像

分享一下关于matplotlib 鼠标拖动坐标图像/鼠标滑轮放大缩小坐标图像的代码
先看效果：

1、鼠标左键拖动坐标图像

# 鼠标左键拖拽事件
self.lastx = 0  # 获取鼠标按下时的坐标X
self.lasty = 0  # 获取鼠标按下时的坐标Y
self.press = False

self.figure.canvas.mpl_connect("button_press_event", self.on_press)
self.figure.canvas.mpl_connect("button_release_event", self.on_release)
self.figure.canvas.mpl_connect("motion_notify_event", self.on_move)

接着是具体函数

# ================ 鼠标左键拖拽坐标 ================ #
def on_press(self, event):
    if event.inaxes:  # 判断鼠标是否在axes内
        if event.button == 1:  # 判断按下的是否为鼠标左键1（右键是3）
            self.press = True
            self.lastx = event.xdata  # 获取鼠标按下时的坐标X
            self.lasty = event.ydata  # 获取鼠标按下时的坐标Y

def on_move(self, event):
    axtemp = event.inaxes
    if axtemp:
        if self.press:  # 按下状态
            # 计算新的坐标原点并移动
            # 获取当前最新鼠标坐标与按下时坐标的差值
            x = event.xdata - self.lastx
            y = event.ydata - self.lasty
            # 获取当前原点和最大点的4个位置
            x_min, x_max = axtemp.get_xlim()
            y_min, y_max = axtemp.get_ylim()

            x_min = x_min - x
            x_max = x_max - x
            y_min = y_min - y
            y_max = y_max - y

            axtemp.set_xlim(x_min, x_max)
            axtemp.set_ylim(y_min, y_max)
            self.figure.canvas.draw()  # 绘图动作实时反映在图像上

def on_release(self, event):
    if self.press:
        self.press = False  # 鼠标松开，结束移动

2、鼠标滑轮放大缩小坐标图像

# 鼠标滚轮事件
self.figure.canvas.mpl_connect('scroll_event', self.call_back)

接着是具体函数（这里我增加了y轴的放大缩小）

# ================ 鼠标滚轮放大缩小坐标 ================ #
def call_back(self, event):
     axtemp = event.inaxes
     x_min, x_max = axtemp.get_xlim()
     y_min, y_max = axtemp.get_ylim()
     xfanwei = (x_max - x_min) / 10
     yfanwei = (y_max - y_min) / 10
     if event.button == 'up':
         axtemp.set(xlim=(x_min + xfanwei, x_max - xfanwei))
         axtemp.set(ylim=(y_min + yfanwei, y_max - yfanwei))
     elif event.button == 'down':
         axtemp.set(xlim=(x_min - xfanwei, x_max + xfanwei))
         axtemp.set(ylim=(y_min - yfanwei, y_max + yfanwei))
     self.figure.canvas.draw_idle()  # 绘图动作实时反映在图像上

转载：
https://blog.csdn.net/qhdok/article/details/124826011
https://www.jb51.net/article/247365.htm