Move the editions into a subfolder

editions/tw2/source/tiddlywiki/js/Animator.js

@@ -0,0 +1,46 @@
+//-
+//- Animation engine
+//-
+
+function Animator()
+{
+	this.running = 0; // Incremented at start of each animation, decremented afterwards. If zero, the interval timer is disabled
+	this.timerID = 0; // ID of the timer used for animating
+	this.animations = []; // List of animations in progress
+	return this;
+}
+
+// Start animation engine
+Animator.prototype.startAnimating = function() //# Variable number of arguments
+{
+	var t;
+	for(t=0; t<arguments.length; t++)
+		this.animations.push(arguments[t]);
+	if(this.running == 0) {
+		var me = this;
+		this.timerID = window.setInterval(function() {me.doAnimate(me);},10);
+	}
+	this.running += arguments.length;
+};
+
+// Perform an animation engine tick, calling each of the known animation modules
+Animator.prototype.doAnimate = function(me)
+{
+	var a = 0;
+	while(a < me.animations.length) {
+		var animation = me.animations[a];
+		if(animation.tick()) {
+			a++;
+		} else {
+			me.animations.splice(a,1);
+			if(--me.running == 0)
+				window.clearInterval(me.timerID);
+		}
+	}
+};
+
+Animator.slowInSlowOut = function(progress)
+{
+	return(1-((Math.cos(progress * Math.PI)+1)/2));
+};
+