使用matplotlib检测图像中的鼠标事件 [英] Detecting mouse event in an image with matplotlib

问题描述

所以我正在尝试编写一个程序来检测图像上的鼠标点击并保存x，y位置。我一直在使用matplotlib并且我使用了基本的情节，但是当我尝试对图像使用相同的代码时，我收到以下错误：

So I'm trying write a program that detects a mouse click on an image and saves the x,y position. I've been using matplotlib and I have it working with a basic plot, but when I try to use the same code with an image, I get the following error:

cid = implot.canvas.mpl_connect（'button_press_event'，onclick）
'AxesImage'对象没有属性'canvas'

cid = implot.canvas.mpl_connect('button_press_event', onclick) 'AxesImage' object has no attribute 'canvas'

这是我的代码：

import matplotlib.pyplot as plt

im = plt.imread('image.PNG')
implot = plt.imshow(im)

def onclick(event):
    if event.xdata != None and event.ydata != None:
        print(event.xdata, event.ydata)
cid = implot.canvas.mpl_connect('button_press_event', onclick)

plt.show()

如果您对如何解决此问题或更好的方法有任何想法，请告诉我。实现我的目标。非常感谢！

Let me know if you have any ideas on how to fix this or a better way to achieve my goal. Thanks so much!

推荐答案

问题是 implot 是一个子-class of Artist ，它绘制到 canvas 实例，但不包含（易于获取）引用画布。您要查找的属性是数字类的属性。

The problem is that implot is a sub-class of Artist which draws to a canvas instance, but does not contain a (easy to get to) reference to the canvas. The attribute you are looking for is an attribute of the figure class.

您想要这样做：

ax = plt.gca()
fig = plt.gcf()
implot = ax.imshow(im)

def onclick(event):
    if event.xdata != None and event.ydata != None:
        print(event.xdata, event.ydata)
cid = fig.canvas.mpl_connect('button_press_event', onclick)

plt.show()

这篇关于使用matplotlib检测图像中的鼠标事件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！