Is there any GUI package that would support "drawing" with a Mouse? I.e., I want to recognize mouse down, track the cursor until mouse up, and draw the pixels to trace the path of the cursor.
If not, on a Mac, would Cocoa+Swift+Julia or Cocoa+Objective-C+Julia be the easiest option? So write the GUI code natively, which talks to a Julia back-end. (I'm not too fussed that this would make it Mac-only.)
