39 lines
No EOL
1,004 B
JavaScript
39 lines
No EOL
1,004 B
JavaScript
|
|
var FrameRate = function() {
|
|
|
|
var desiredFPS = 40;
|
|
var msPerFrame = 1000 / desiredFPS;
|
|
|
|
// Set the desired rate of frames per second.
|
|
// Default is 40 if no desiredFPS event is triggered.
|
|
document.addEventListener('desiredFPS', function(e) {
|
|
console.log(e.value);
|
|
desiredFPS = e.value;
|
|
msPerFrame = 1000 / desiredFPS;
|
|
});
|
|
|
|
|
|
var date = new Date();
|
|
var startTime = date.getTime();
|
|
var frameStart = startTime;
|
|
var frameEnd = startTime;
|
|
var timeoutID = 0;
|
|
|
|
// Trigger time events to try to maintain the desired FPS.
|
|
document.addEventListener('finished', function(evt) {
|
|
clearTimeout(timeoutID);
|
|
date = new Date();
|
|
frameEnd = date.getTime();
|
|
var diff = frameEnd - frameStart;
|
|
var waitTime = Math.max(msPerFrame-diff,3);
|
|
timeoutID = setTimeout(function() {
|
|
date = new Date();
|
|
frameStart = date.getTime();
|
|
var e = document.createEvent('Event');
|
|
e.initEvent('trigger', true, true);
|
|
e.value = (frameStart - startTime) / 1000;
|
|
document.dispatchEvent(e);
|
|
}, waitTime);
|
|
});
|
|
|
|
}(); |