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TiddlyWiki5/editions/tw2/source/tiddlywiki/js/Animator.js
2012-11-16 21:20:27 +00:00

47 lines
1.1 KiB
JavaScript
Executable File

//-
//- 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));
};