flex根据两个颜色返回任意多个渐变颜色

//根据2个颜色返回多个渐变色
public class ColorGradient
{
public function ColorGradient()
{
}
/**
* 输入一个颜色,将它拆成三个部分:
* 红色,绿色和蓝色
*/
public static function retrieveRGBComponent( color:uint ):Array
{
var r:Number = color >> 16;
var g:Number = (color >> 8) & 0xff;
var b:Number = color & 0xff;

return [r, g, b];
}
/**
* 红色,绿色和蓝色三色组合
*/
public static function generateFromRGBComponent( rgb:Array ):int
{
if( rgb == null || rgb.length != 3 ||
rgb[0] < 0 || rgb[0] > 255 ||
rgb[1] < 0 || rgb[1] > 255 ||
rgb[2] < 0 || rgb[2] > 255 )
return 0xFFFFFF;
return rgb[0] << 16 | rgb[1] << 8 | rgb[2];
}

/**
* color1是浅色,color2是深色,实现渐变
* steps是指在多大的区域中渐变,
*/
public static function generateTransitionalColor( color1:uint, color2:uint, steps:int):Array
{
if( steps < 3 )
return [];

var color1RGB:Array = retrieveRGBComponent( color1 );
var color2RGB:Array = retrieveRGBComponent( color2 );

var colors:Array = [];
colors.push( color1 );
//steps = steps - 2;

var redDiff:Number = color2RGB[0] - color1RGB[0];
var greenDiff:Number = color2RGB[1] - color1RGB[1];
var blueDiff:Number = color2RGB[2] - color1RGB[2];
for( var i:int = 1; i < steps - 1; i++)
{
var tmpRGB:Array = [
color1RGB[0] + redDiff * i / steps,
color1RGB[1] + greenDiff * i / steps,
color1RGB[2] + blueDiff * i / steps
];
colors.push( generateFromRGBComponent( tmpRGB ) );
}
colors.push( color2 );

return colors;
}
}

使用方法：只需调用generateTransitionalColor方法，例如：

var c1:uint=0xFF0000;

var c2:uint=0x000000;

var colors:Array=ColorGradient.generateTransitionalColor(c1,c2,10);

最后效果图如下：