Canvas renderer caching

[schteppe]

Hi,
Nice work with the engine!
Regarding the demo CanvasRenderer, I see you rerender circles very often. By caching the ones of same size + color and doing ctx.drawImage( cachedCanvas, x, y ), you can speed up things a lot.

For an example, see http://iainlobb.com/bunnies/bunnies.html
Or: http://www.professorcloud.com/mainsite/cache-canvas.htm

Stefan