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20180823-window-requestAnimationFrame.md

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Canvas requestAnimationFrame

window.requestAnimationFrame provides a way to schedule animation updates in between browser repaints. The method takes a callback that will be invoked prior to the next repaint. The function returns a long integer value identifying the scheduled callback, passing this value to cancelAnimationFrame will cancel the request.

The callback is generally called at a rate that matches the display refresh rate and will receive a DOMHighResTimeStamp value which indicates the current time. If there are multiple callbacks queued, they will all receive the same timestamp in each cycle of repainting.

...
const updateFrames = (time) => {
 // perform animation updates here
 ...
 // call requestAnimationFrame again, to ensure we update on the next repaint
 requestAnimationFrame(updateFrames)
}

const start = () => requestAnimationFrame(updateFrames);
start();
...

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