matlab 实时显示取鼠标坐标
时间: 2023-08-14 15:00:55 浏览: 906
在 MATLAB 中实时显示鼠标坐标可以使用鼠标动作事件实现。首先,需要创建一个图像窗口,并设置一个鼠标动作回调函数:
```matlab
figure;
set(gcf,'WindowButtonDownFcn',@mouseClicked);
```
然后,在回调函数 `mouseClicked` 中获取鼠标点击位置:
```matlab
function mouseClicked(~,~)
coordinates = get(gca,'CurrentPoint');
x = coordinates(1,1);
y = coordinates(1,2);
disp(['鼠标点击位置:(', num2str(x), ', ', num2str(y), ')']);
end
```
以上代码中,`get(gca,'CurrentPoint')` 函数用于获取鼠标点击位置的图像坐标。`disp` 函数用于在命令行窗口中显示鼠标坐标位置。
要实时显示鼠标坐标,可以在回调函数中更新坐标显示。首先,在代码开始部分定义一个文本标签:
```matlab
txt = text(0,0,'');
```
然后,修改 `mouseClicked` 回调函数如下:
```matlab
function mouseClicked(obj,~)
coordinates = get(gca,'CurrentPoint');
x = coordinates(1,1);
y = coordinates(1,2);
set(txt,'String',['鼠标点击位置:(', num2str(x), ', ', num2str(y), ')']);
set(txt,'Position',[x y]);
end
```
最后,要想实现实时显示,需要在回调函数中使用 `drawnow` 函数:
```matlab
function mouseClicked(obj,~)
coordinates = get(gca,'CurrentPoint');
x = coordinates(1,1);
y = coordinates(1,2);
set(txt,'String',['鼠标点击位置:(', num2str(x), ', ', num2str(y), ')']);
set(txt,'Position',[x y]);
drawnow;
end
```
通过这样的代码实现,当鼠标点击图像时,会在图像上显示鼠标坐标,并且实时更新。
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