MATLAB how to get mouse click coordinates

I have made my GUI using GUIDE. I have an axes (tag=axes1). An image is displayed in the axes. When i click on the image(inside axes) I need to get the coordinates. I get the coordinate values when image is not added to axes.But image is displayed in axes do no obtain the axes. How to get the coordinates?

Answers


Let's assume that you've plotted the image with handle imageHandle that:

imageHandle = imshow(imageObj);

You should assign the ButtonDownFcn to the image handle not the axes handle that:

set(imageHandle,'ButtonDownFcn',@ImageClickCallback);

and get the mouse coordinates from this function as follows:

function ImageClickCallback ( objectHandle , eventData )
   axesHandle  = get(objectHandle,'Parent');
   coordinates = get(axesHandle,'CurrentPoint'); 
   coordinates = coordinates(1,1:2);
   %// then here you can use coordinates as you want ...
end

You can try this small demo to check my answer:

function demoOnImageClick
clc;clear;
imObj = rand(500,500);
figure;
hAxes = axes();
imageHandle = imshow(imObj);
set(imageHandle,'ButtonDownFcn',@ImageClickCallback);

function ImageClickCallback ( objectHandle , eventData )
axesHandle  = get(objectHandle,'Parent');
coordinates = get(axesHandle,'CurrentPoint'); 
coordinates = coordinates(1,1:2);
message     = sprintf('x: %.1f , y: %.1f',coordinates (1) ,coordinates (2));
helpdlg(message);
end

end

You can get the axes handle from the image handle by

ah = get( imageHandle, 'Parent' );

Then you can get the mouse click position by

p = get( ah, 'CurrentPoint' );

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