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reinierf

Flash IDE classic tween ease

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Hi all,

 

Here is an ease class that exactly replicates the Flash IDE classic tween easing (where you can enter a value in the range -100..100 for a timeline ease).

A customer of mine wanted to be able to use the values he always worked with so I replicated the ease function used in the Flash IDE.

Use it as you like. Create a file for the code and place it in com.greensock.easing.

 

Usage example :

TweenLite.to(mc, 2, {x:100, ease:ClassicEase.ease, easeParams:[50]});

This will tween the mc.x property to 100 with an classic tween ease of value 50.

 

package com.greensock.easing
{
/**
 * Class containing ease function that replicates the classic tween ease of the flash IDE
 * Can be used by TweenLite/TweenMax etc
 * Usage example:
 * TweenLite.to(mc, 2, {x:100, ease:ClassicEase.ease, easeParams:[50]});
 * @version 1.0
 * @author Reinier Feijen
 */
public class ClassicEase
{
	/**
	 * Ease function that replicates the classic tween ease of the flash IDE
	 * Can be used by TweenLite/TweenMax etc
	 * @param	t elapsed time of tween
	 * @param	b duration of tween
	 * @param	c min output value, at t=0
	 * @param	d total offset (max output value minus b, at t=d)
	 * @param	v classic ease value in range [-100,100] where a value < 0 is easeIn and value > 0 is easeOut. Larger values are also valid!
	 * @return output value in range [b..(b+c)]
	 */
	static public function ease(t:Number, b:Number, c:Number, d:Number, v:Number=0):Number 
	{
		if (v >= 0) return b + c * (1 - Math.pow((1 - t/d), 1 + Math.abs(v / 100) ));
		return b + c * (Math.pow(t/d, 1 + Math.abs(v / 100) ));
	}
}
}

 

Best,

 

Reinier

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Hi reinierf,

 

I never would have thought of that being a feature request, but if one person wants it, I'm sure there are others.

 

Its very nice of you to share your solution. I'm impressed.

 

 

Carl

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