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class ColorFader extends Color{
private var _id:Number; // id for setInterval call
private var _interval:Number = 33; // default interval for fading
private var _colorFrom:Object; // information about starting color
private var _colorTo:Object; // information about the color fading to
private var _remains:Number; // number of updates remaining for a fade
private var _total:Number; // total number of updates being used for a fade
// constructor
function ColorFader(mc){
super(mc); // based off the Color Object
}
/**
* hexTo: hex to fade to
* duration: length of time to spend fading to hexTo
* opt_interval: (optional) the rate at which the fade updates. Default: 33 milliseconds
*/
public function fadeTo (hexTo, duration, opt_interval):Void {
clearInterval(_id); // stop any existing fade
var rgb = getRGB(); // assign color objects
_colorFrom = {r:rgb>>16, g:(rgb >> 8)&0xff, b:rgb&0xff, hex:rgb};
_colorTo = {r:hexTo>>16, g:(hexTo >> 8)&0xff, b:hexTo&0xff, hex:hexTo};
var interval = (opt_interval != undefined) ? opt_interval : _interval; // determine interval
_remains = _total = Math.ceil(duration/interval); // calc updates needed in fade
_id = setInterval(this, "doFade", interval); // call doFade to update fading every interval milliseconds
}
private function doFade():Void {
if (_remains){ // if remaining updates exist
_remains--;
var t = 1 - _remains/_total; // process fade between colors
setRGB((_colorFrom.r+(_colorTo.r-_colorFrom.r)*t) << 16 | (_colorFrom.g+(_colorTo.g-_colorFrom.g)*t) << 8 | (_colorFrom.b+(_colorTo.b-_colorFrom.b)*t));
}else{ // if no more remains
setRGB(_colorTo.hex); // set to hex of color fading to
clearInterval(_id); // clear/stop interval
}
updateAfterEvent();
}
}
