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class com.robertpenner.easing.Expo {
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static function easeIn (t:Number, b:Number, c:Number, d:Number):Number {
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return (t==0) ? b : c * Math.pow(2, 10 * (t/d - 1)) + b;
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static function easeOut (t:Number, b:Number, c:Number, d:Number):Number {
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return (t==d) ? b+c : c * (-Math.pow(2, -10 * t/d) + 1) + b;
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static function easeInOut (t:Number, b:Number, c:Number, d:Number):Number {
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if ((t/=d/2) < 1) return c/2 * Math.pow(2, 10 * (t - 1)) + b;
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return c/2 * (-Math.pow(2, -10 * --t) + 2) + b;