37 lines
1.1 KiB
TypeScript
37 lines
1.1 KiB
TypeScript
import { Cancel, Source } from "./source";
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export type PhysicsTick = ["physics"];
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export type RenderTick = ["render", number];
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export function tick(fps: number): Source<PhysicsTick | RenderTick> {
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function tickSource(): PhysicsTick;
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function tickSource(
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callback: (tick: PhysicsTick | RenderTick) => void
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): Cancel;
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function tickSource(callback?: (tick: PhysicsTick | RenderTick) => void) {
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if (callback) {
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let lastPhysicsTick: number = new Date().getTime();
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const physicsInterval = setInterval(() => {
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lastPhysicsTick = new Date().getTime();
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callback(["physics"]);
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}, 1000 / fps);
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let animationFrame = requestAnimationFrame(function animationTick() {
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const now = new Date().getTime();
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callback(["render", (now - lastPhysicsTick) / 1000]);
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animationFrame = requestAnimationFrame(animationTick);
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});
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return () => {
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clearInterval(physicsInterval);
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cancelAnimationFrame(animationFrame);
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};
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} else {
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return ["physics"];
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}
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}
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return tickSource;
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}
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