Tracking mouse position on figure

I'm looking for some way of turning a JPEG into a MATLAB figure (which I know how to do). And then be able click on the figure and have the x and y values of where I clicked go into the code as variables, so I can take them through some function. Then be able to update the image with a circle at the point where I clicked if the x and y values fulfil a certain criteria from the function.

Answer 1

[Image Analyst]

% Get x,y coordinates
[x, y] = ginput(1);  
% x = column, not row.  So use yourImage(y,x), not yourImage(x,y)!

See the FAQ for code examples on creating circles. http://matlab.wikia.com/wiki/FAQ#How_do_I_create_a_circle.3F

[Jonathan Cellere]

This command helped me a lot, could you help me? I made a GUI application where I need to get the X, Y positions of a figure however I need to delimit that the cursor can only take the values ​​of the figure and not others such as a button that is next

Answer 2

[Pourya Alinezhad]

you can use the function

 [x,y] = ginput(4)