Question about mouse click on figure

Hello,

I am trying to put marks on the figure where I click and save it. I used 'ginput'

 imshow('image.png')
 for i = 1:1000
 [p(i,1), p(i,2)] = ginput;
 hold on;
 plot(p(i,1), p(i,2));
 hold off;
 end

I found out that 'ginput' is not only taking 'left mouse click,' but also any other mouse clicks or keyboard pressing. Also, I don't know how to undo marking on the figure.

My questions are: Is there any way to only use left mouse click? And, is there any way to undo marking on the figure?

I will appreciate any advice.

Thank you

Answer 1

[Mischa Kim]

This code snippet should get you started:

 button = 1;
 getpt  = 1;
 [x,y,button] = ginput(1);
 XY           = [x y];
 while (getpt == 1)
    if (button == 1) % draw line for left mouse click
        [xn,yn,button] = ginput(1);
        XY = [XY; xn yn];
        hold on
        plot([x; xn],[y; yn])
        x = xn; y = yn;
    end
    if (button == 3) % clear lines for right mouse click
        children = get(gca, 'children');
        delete(children);
        getpt = 0;
    end
 end

[mathScience]

Thank you!