gistfile1.js

/**
 * Simple animation loop with start and stop controls.
 */

var animationFrameId;

/**
 * Animation Loop.
 *
 * @uses animationFrameId
 * @uses requestAnimationFrame()
 */
function animate() {
	animationFrameId = window.requestAnimationFrame( animate );
	render();
}

/**
 * Start the animation.
 *
 * @uses animationFrameId
 * @uses animate()
 */
function start() {
	if ( ! animationFrameId )
		animate();
}

/**
 * Stop the animation.
 *
 * @uses animationFrameId Sets the value of id to undefined.
 * @uses cancelAnimationFrame() to stop the animation.
 */
function stop() {
	if ( animationFrameId ) {
		animationFrameId = window.cancelAnimationFrame( animationFrameId );
		animationFrameId = undefined;
	}
}