How to replace the 'hardcopy' function with something that will run in Octave

Hello all!

I am working to read in images, lay scatterplot data over them, and then export them as a movie. I have done this successfully in matlab, but need to make it work in Octave now. The only remaining conversion issue is the hardcopy function that I use at the end of the code.

detailed here http://www.mathworks.com/support/solutions/en/data/1-3NMHJ5/?solution=1-3NMHJ5 (in the solution) are two alternatives to the hardcopy function (#2 looks promising) but I'm not sure what of my block of code to replace with the imread calls.

The code I have (which works) is:

      renderer = get(hnd,'renderer');
      if strcmp(renderer,'painters')
          renderer = 'opengl';
      end
      set(hnd, 'Units', 'pixels');
      pixelsperinch = get(0,'screenpixelsperInch');

      frame = hardcopy(hnd, ['-d' renderer], ['-r'    num2str(round(pixelsperinch))]);
      addframe(mov,frame);

I have tried replacing all of that with

addframe(mov,gcf)

But it just returns error: addframe: input frame should be in [0-1]

Any suggestions (or interpretations of the link I posted) on how to use something other than that hardcopy function to accomplish the same goal would be unbeliviably appreciated. Thank you all!

[Cam]

The best way to go is probably to capture the image data directly from openGL. (Probably faster than printing it as an image, imreading it, and then adding that as a frame) But, I'm really not sure, and am ok with something being slower if it works.

Answer 1

[Jan]

Perhaps FEX: ScreenCapture runs under Octave also.

Which OS do you use?

[Cam]

Thanks for responding Jan! Sorry it took so long for me to get back to you (I was in the adirondacks). I'm using Windows 7.