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2つの色の中間色を求める

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アニメーションなどで背景を赤から青へ変化させるときなどに使う関数。開始色、終了色、係数を指定して色を得る。

係数は0なら開始色と同じになり、1なら終了色と同じになり、0.5ならちょうど中間の色となる。Tweenなどで係数を0から1へ変化させるよい。

package
{
	import flash.display.Sprite;

	public class Test extends Sprite
	{

		public static function interpolateRGB(fromRGB:uint, toRGB:uint, interpolation:Number):uint
		{
			var fr:uint = (fromRGB & 0xff0000) >> 16;
			var fg:uint = (fromRGB & 0xff00) >> 8;
			var fb:uint = fromRGB & 0xff;

			var tr:uint = (toRGB & 0xff0000) >> 16;
			var tg:uint = (toRGB & 0xff00) >> 8;
			var tb:uint = toRGB & 0xff;

			if (interpolation < 0)
			{
				interpolation = 0;
			}
			else if (interpolation > 1)
			{
				interpolation = 1;
			}

			var r:uint = Math.round(fr + (tr - fr) * interpolation);
			var g:uint = Math.round(fg + (tg - fg) * interpolation);
			var b:uint = Math.round(fb + (tb - fb) * interpolation);

			return (r << 16) | (g << 8) | b;
		}
	}
}

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