Trying to crop visible area of panzoom - how to handle zoom/scale for x/y coords

[rich06]

Hello

Cool library - thanks for all the hard work!

I am trying to crop the visible area of a panzoom controlled image. I'm doing this by converting the image to a canvas using the panzoom pan coordinates as offsets for the crop. This works fine when no scaling/zooming occurs but when that happens the coordinates no longer match the 'visible' area.

What's the best way to achieve this? Any suggestions welcome!

Thanks in advance
Rich