/*
	CASA Framework for ActionScript 3.0
	Copyright (c) 2008, Contributors of CASA Framework
	All rights reserved.
	
	Redistribution and use in source and binary forms, with or without
	modification, are permitted provided that the following conditions are met:
	
	- Redistributions of source code must retain the above copyright notice,
	  this list of conditions and the following disclaimer.
	
	- Redistributions in binary form must reproduce the above copyright notice,
	  this list of conditions and the following disclaimer in the documentation
	  and/or other materials provided with the distribution.
	
	- Neither the name of the CASA Framework nor the names of its contributors
	  may be used to endorse or promote products derived from this software
	  without specific prior written permission.
	
	THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
	AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
	LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
	CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
	SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
	INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
	CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
	POSSIBILITY OF SUCH DAMAGE.
*/
package org.casaframework.util {
	import flash.geom.ColorTransform;
	import org.casaframework.math.Percent;
	import org.casaframework.util.NumberUtil;
	
	/**
		Provides utility functions for dealing with color.
		
		@author Aaron Clinger
		@version 07/08/08
	*/
	public class ColorUtil {
		
		/**
			Interpolates (tints) between two colors.
			
			@param begin: The start color.
			@param end: The finish color.
			@param amount: The level of interpolation between the two colors.
			@return The new interpolated color.
			@usage
				<code>
					var myColor:ColorTransform = new ColorTransform();
					myColor.color              = 0xFF0000;
					
					var box:Sprite = new Sprite();
					box.graphics.beginFill(0x0000FF);
					box.graphics.drawRect(10, 10, 250, 250);
					box.graphics.endFill();
					
					box.transform.colorTransform = ColorUtil.interpolateColor(new ColorTransform(), myColor, new Percent(0.5));
					
					this.addChild(box);
				</code>
		*/
		public static function interpolateColor(begin:ColorTransform, end:ColorTransform, amount:Percent):ColorTransform {
			var interpolation:ColorTransform = new ColorTransform();
			
			interpolation.redMultiplier   = NumberUtil.interpolate(begin.redMultiplier, end.redMultiplier, amount);
			interpolation.greenMultiplier = NumberUtil.interpolate(begin.greenMultiplier, end.greenMultiplier, amount);
			interpolation.blueMultiplier  = NumberUtil.interpolate(begin.blueMultiplier, end.blueMultiplier, amount);
			interpolation.alphaMultiplier = NumberUtil.interpolate(begin.alphaMultiplier, end.alphaMultiplier, amount);
			interpolation.redOffset       = NumberUtil.interpolate(begin.redOffset, end.redOffset, amount);
			interpolation.greenOffset     = NumberUtil.interpolate(begin.greenOffset, end.greenOffset, amount);
			interpolation.blueOffset      = NumberUtil.interpolate(begin.blueOffset, end.blueOffset, amount);
			interpolation.alphaOffset     = NumberUtil.interpolate(begin.alphaOffset, end.alphaOffset, amount);
			
			return interpolation;
		}
	}
}