I'd like to draw some circles and lines that need to be dynamically shaped and sized (so just using textures isn't an option)   I've run across both Phaser.Graphics and the Phaser.BitmapData objects which seem to have a similar purpose.  Can someone explain the difference intentions for their use?  And is it possible to use BitmapData with WebGL rendering (the interface seems quite like the 2d canvas)?   Thanks!