mit-cml/appinventor-sources — pull request #88 by Mateopato (2014-03-14 23:39:54+00:00)
Title: DrawRing for Canvas

Created the DrawRing(int x, int y, float r, float ringWidth) method for the Canvas class that draws a circle with no center fill. There is currently no way to draw a circle with nothing obscuring the center fill area of the background.