One question though: where does the screenshot of the item which has been clicked on come from? As far as I understand your lib does not provide any means to create a screenshot? Is this correct? Would it be possible to add this? If not could you explain how you would make sure the coordinates and the screenshot at any given time match?
Just curious and interested in using your library :)
-You provide an image.
-You provide x,y coordinates.
-The tool/library calculates a heatmap from the relationship between coordinates
-The tool overlays the heatmap 1:1 to the image
The Google screenshot and clicking demo is just an example of a possible implementation. You can use heatmaps for many many other things so this surely does not limit itself (nor prefer) to website click tracking. ;-)
If there was sufficient interest, I could implement relative positioning as well, where they resolve to a percentage of the source image.