MATLAB: Does the crosshair of ginput erase the underlying plot created with surf

ginputopenglredrawsurf crosshair

Using ginput(1) on surf(peaks) in Matlab R2013a leads to the fact, that the drawn crosshair erases the underlying plot. Seems like the redraw-command is not invoked. Is this a known bug, is there anything I'm doing wrong or does anyone know a workaround?

Thanks a lot for your help!

Best Answer

My guess is this is related to your OpenGL hardware drivers. First, try updating your graphics drivers. If that does not work, run the following:

opengl software

to force MATLAB to use the software implementation of OpenGL

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MATLAB: Ginput without the crosshairs

Nevermind, this one was ridiculously easy once I read properly through the documentation.

The command I found that worked was:

d = get(gca,'CurrentPoint');

to get the coordinates, d in my case was a 2-element array for x and y.

MATLAB: Ginput

d=zeros(408,544,160);
image = rand(size(d));
for i=1:160
  figure,imshow(image(:,:,i),[]);
  [a,b]=ginput(1);
  a = round(a);
  b = round(b);
  z=image(a,b,i);d(a,b,i)=z;
end

You have to round the points returned from ginput to account for floating points. I would also recommend against opening a new figure on each iteration.

Best Answer

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MATLAB: Ginput without the crosshairs

MATLAB: Ginput

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