class Clock {
constructor( autoStart = true ) {
this.autoStart = autoStart;
this.startTime = 0;
this.oldTime = 0;
this.elapsedTime = 0;
this.running = false;
}
start() {
this.startTime = now();
this.oldTime = this.startTime;
this.elapsedTime = 0;
this.running = true;
}
stop() {
this.getElapsedTime();
this.running = false;
this.autoStart = false;
}
getElapsedTime() {
this.getDelta();
return this.elapsedTime;
}
getDelta() {
let diff = 0;
if ( this.autoStart && ! this.running ) {
this.start();
return 0;
}
if ( this.running ) {
const newTime = now();
diff = ( newTime - this.oldTime ) / 1000;
this.oldTime = newTime;
this.elapsedTime += diff;
}
return diff;
}
}
function now() {
return performance.now();
}
export { Clock };