Added comments, removed dead code.
Added comments, removed dead code.

slightair/SwiftGraphics,Pretz/SwiftGraphics,rhcad/SwiftGraphics,SheffieldKevin/SwiftGraphics,sdesimone/SwiftGraphics,hejunbinlan/SwiftGraphics,SheffieldKevin/SwiftGraphics,slightair/SwiftGraphics,marinehero/SwiftGraphics,slightair/SwiftGraphics,Pretz/SwiftGraphics,hejunbinlan/SwiftGraphics,SheffieldKevin/SwiftGraphics,sdesimone/SwiftGraphics,Pretz/SwiftGraphics,rhcad/SwiftGraphics,Pretz/SwiftGraphics,hejunbinlan/SwiftGraphics,marinehero/SwiftGraphics,sdesimone/SwiftGraphics,marinehero/SwiftGraphics,slightair/SwiftGraphics,marinehero/SwiftGraphics,rhcad/SwiftGraphics,hejunbinlan/SwiftGraphics,sdesimone/SwiftGraphics,rhcad/SwiftGraphics