Initial commit

lib/impact/timer.js

@@ -0,0 +1,72 @@
+ig.module(
+	'impact.timer'
+)
+.defines(function(){ "use strict";
+
+ig.Timer = ig.Class.extend({
+	target: 0,
+	base: 0,
+	last: 0,
+	pausedAt: 0,
+	
+	init: function( seconds ) {
+		this.base = ig.Timer.time;
+		this.last = ig.Timer.time;
+		
+		this.target = seconds || 0;
+	},
+	
+	
+	set: function( seconds ) {
+		this.target = seconds || 0;
+		this.base = ig.Timer.time;
+		this.pausedAt = 0;
+	},
+	
+	
+	reset: function() {
+		this.base = ig.Timer.time;
+		this.pausedAt = 0;
+	},
+	
+	
+	tick: function() {
+		var delta = ig.Timer.time - this.last;
+		this.last = ig.Timer.time;
+		return (this.pausedAt ? 0 : delta);
+	},
+	
+	
+	delta: function() {
+		return (this.pausedAt || ig.Timer.time) - this.base - this.target;
+	},
+
+
+	pause: function() {
+		if( !this.pausedAt ) {
+			this.pausedAt = ig.Timer.time;
+		}
+	},
+
+
+	unpause: function() {
+		if( this.pausedAt ) {
+			this.base += ig.Timer.time - this.pausedAt;
+			this.pausedAt = 0;
+		}
+	}
+});
+
+ig.Timer._last = 0;
+ig.Timer.time = Number.MIN_VALUE;
+ig.Timer.timeScale = 1;
+ig.Timer.maxStep = 0.05;
+
+ig.Timer.step = function() {
+	var current = Date.now();
+	var delta = (current - ig.Timer._last) / 1000;
+	ig.Timer.time += Math.min(delta, ig.Timer.maxStep) * ig.Timer.timeScale;
+	ig.Timer._last = current;
+};
+
+});