discussion

[jsbain]

ok, hopefully these versions make a little more sense.

implementing a slider should be easy -- just replace the textview with a slider, and use self.scale.value instead of float(self.scale.text) everywhere it is used.

zooming will be tricky. someone published a gestures module which can be used to identify pan/zoom. but where it gets tricky is now we have to offset and scale the drawing and image. maybe ui.Transform will work.

Adding a new image should be easy if you add a button for a file menu. omz's file picker might work well there.