I think canvas should contain a method to clear entire canvas
regardless of current context.
The clearing approach with Integer.MIN-MAX works great on
chrome,safar,opera but not ie and ff.
/*
* canvas.getContext2d().save();
* canvas.getContext2d().setTransform(1,0,0,1,0,0);
* canvas.getContext2d().clearRect(0, 0,
* canvas.getCoordinateSpaceWidth(),
canvas.getCoordinateSpaceHeight());
* canvas.getContext2d().restore();
*/
canvas.getContext2d().clearRect(Integer.MIN_VALUE / 2,
Integer.MIN_VALUE / 2, Integer.MAX_VALUE, Integer.MAX_VALUE);
/* canvas.getContext2d().clearRect(0,0,
canvas.getCanvasElement().getWidth(),
canvas.getCanvasElement().getHeight());
*/
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