Spare5 Polygon Tool

Not too long ago we were developing a tool for Spare5 that would let our users draw polygonal shapes around portions of an image. We needed to enable users to draw both positive and negative shapes (ala Sketch and Illy!) but on a mobile device. This is one screen (of many) that explored how we might let users choose whether a given shape should be counted positively or negatively when cutting out an object within an image.