Fog of war
This example shows how you might keep an HTML canvas in sync with canvas content. It implements a simple "fog of war" effect, where the canvas is covered by a black overlay that can be cleared by drawing shapes on the canvas.
This example shows how you might keep an HTML canvas in sync with canvas content. It implements a simple "fog of war" effect, where the canvas is covered by a black overlay that can be cleared by drawing shapes on the canvas.