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class PrecisionTimer {
constructor() {
this.frameInterval = 0.0;
this.setFramerate(30);
this.timerRunning = false;
this.lastFrameTime = performance.now();
}
start(callback) {
if (this.timerRunning) {
return; // Already running - Start gate
}
this.timerRunning = true;
this.lastFrameTime = performance.now();
this._pollingTick(callback);
}
_pollingTick(callback) {
if(!this.timerRunning) {
return; // Stop gate
}
// key up the next tick
setTimeout(() => {
this._pollingTick(callback);
}, (this.frameInterval));
const currentTime = performance.now();
const elapsedMs = currentTime - this.lastFrameTime;
callback(elapsedMs);
const runTime = performance.now() - currentTime;
this.lastFrameTime = currentTime;
}
stop() {
this.timerRunning = false;
}
now() {
return performance.now();
}
setFramerate(fps) {
this.framerate = fps;
this.frameInterval = 1000 / this.framerate;
}
static roundTo(value, decimals) {
const factor = Math.pow(10, decimals);
return Math.round(value * factor) / factor;
}
}
export default PrecisionTimer; |