flash代码改变元件亮度、色调、高级、透明度的方法

通过Color类来改变影片颜色

亮度：(设置影片明暗效果)

import com.common.motion.Color;//继承ColorTransform

var color:Color = new Color();

color.brightness = [-1,1] //-1~1是取值范围

mc.transform.colorTransform = color; //mc是影片剪辑的名字

色调：(改变影片颜色)

有四个值：色调百分比，red、green、blue值

import com.common.motion.Color;

var color:Color = new Color();

color.setTint(0x808080,1); //第一个参数是tintColor RGB值，第二个参数是tintMultiplier 着色百分比，取值范围0到1。

mc.transform.colorTransform = color;

注：十六进制转十进制 trace(0x808080); 也可以用0x80 高位的8乘以16 再加上低位的值

十进制转十六进制 trace((128).toString(16)); 也可以用128除以16取得高位值，余数为低位值。

//128只是个参考，R、G、B各分量的十进制值分别是0~255中的任意数。

高级：(改变影片颜色的另一种方式)

import com.common.motion.Color;

var color:Color = new Color(redMultiplier:Number = 1.0, greenMultiplier:Number = 1.0, blueMultiplier:Number = 1.0, alphaMultiplier:Number = 1.0, redOffset:Number = 0, greenOffset:Number = 0, blueOffset:Number = 0, alphaOffset:Number = 0);

有八个参数，分别是ARGB各分量的填充百分比，取值0~1.，后四个是ARGB各分量的偏移量，取值-255~255。

mc.transform.colorTransform = color;

Alpha值：(改变影片透明度)

mc.alpha = 1; //取值0~1；

通过ColorTransform类来改变影片颜色值。

import flash.geom.ColorTransform;

var colorInfo:ColorTransform = new ColorTransform();

colorInfo.color = 0x808080;

mc.transform.colorTransform = colorInfo;

当 ColorTransform 对象应用于显示对象时，将按如下方法为每个颜色通道计算新值：

新红色值 = (旧红色值 * redMultiplier) + redOffset

新绿色值 = (旧绿色值 * greenMultiplier) + greenOffset

新蓝色值 = (旧蓝色值 * blueMultiplier) + blueOffset

新 Alpha 值 = (旧 Alpha 值 * alphaMultiplier) + alphaOffset

如果计算后任何一个颜色通道值大于 255，则该值将被设置为 255。 如果该值小于 0，它将被设置为 0。

可以通过下列方式使用 ColorTransform 对象：

在 BitmapData 类的 colorTransform() 方法的
colorTransform 参数中

作为 Transform 对象（此对象可以用作显示对象的 transform 属性）的 colorTransform 属性

注：必须使用 new ColorTransform() 构造函数创建 ColorTransform 对象后，才能调用 ColorTransform 对象的方法。

颜色转换不会应用于影片剪辑（如加载的
SWF 对象）的背景色， 它们仅应用于附加到影片剪辑的图形和元件。

///******************************** Color.as *****************************************/

package com.common.motion
{
import flash.display.*;
import flash.geom.ColorTransform;

/**
* The Color class extends the Flash Player ColorTransform class,
* adding the ability to control brightness and tint.
* It also contains static methods for interpolating between two ColorTransform objects
* or between two color numbers.      */
public class Color extends ColorTransform
{

/**
* Constructor for Color instances.
*
* @param redMultiplier The percentage to apply the color, as a decimal value between 0 and 1.
* @param greenMultiplier The percentage to apply the color, as a decimal value between 0 and 1.
* @param blueMultiplier The percentage to apply the color, as a decimal value between 0 and 1.
* @param alphaMultiplier A decimal value that is multiplied with the alpha transparency channel value, as a decimal value between 0 and 1.
* @param redOffset A number from -255 to 255 that is added to the red channel value after it has been multiplied by the <code>redMultiplier</code> value.
* @param greenOffset A number from -255 to 255 that is added to the green channel value after it has been multiplied by the <code>greenMultiplier</code> value.
* @param blueOffset A number from -255 to 255 that is added to the blue channel value after it has been multiplied by the <code>blueMultiplier</code> value.
* @param alphaOffset A number from -255 to 255 that is added to the alpha channel value after it has been multiplied by the <code>alphaMultiplier</code> value.
*/
function Color (redMultiplier:Number=1.0,
greenMultiplier:Number=1.0,
blueMultiplier:Number=1.0,
alphaMultiplier:Number=1.0,
redOffset:Number=0,
greenOffset:Number=0,
blueOffset:Number=0,
alphaOffset:Number=0)
{
super(redMultiplier, greenMultiplier, blueMultiplier, alphaMultiplier, redOffset, greenOffset, blueOffset, alphaOffset);
}

/**
* The percentage of brightness, as a decimal between <code>-1</code> and <code>1</code>.
* Positive values lighten the object, and a value of <code>1</code> turns the object completely white.
* Negative values darken the object, and a value of <code>-1</code> turns the object completely black.
*
* @default 0
*/
public function get brightness():Number
{
return this.redOffset ? (1-this.redMultiplier) : (this.redMultiplier-1);
}

/**
* @private (setter)
*/
public function set brightness(value:Number):void
{
if (value > 1) value = 1;
else if (value < -1) value = -1;
var percent:Number = 1 - Math.abs(value);
var offset:Number = 0;
if (value > 0) offset = value * 255;
this.redMultiplier = this.greenMultiplier = this.blueMultiplier = percent;
this.redOffset     = this.greenOffset     = this.blueOffset     = offset;
}

/**
* Sets the tint color and amount at the same time.
*
* @param tintColor The tinting color value in the 0xRRGGBB format.
*
* @param tintMultiplier The percentage to apply the tint color, as a decimal value between <code>0</code> and <code>1</code>.
* When <code>tintMultiplier = 0</code>, the target object is its original color and no tint color is visible.
* When <code>tintMultiplier = 1</code>, the target object is completely tinted and none of its original color is visible.         */
public function setTint(tintColor:uint, tintMultiplier:Number):void
{
this._tintColor = tintColor;
this._tintMultiplier = tintMultiplier;
this.redMultiplier = this.greenMultiplier = this.blueMultiplier = 1 - tintMultiplier;
var r:uint = (tintColor >> 16) & 0xFF;
var g:uint = (tintColor >>  8) & 0xFF;
var b:uint =  tintColor        & 0xFF;
this.redOffset   = Math.round(r * tintMultiplier);
this.greenOffset = Math.round(g * tintMultiplier);
this.blueOffset  = Math.round(b * tintMultiplier);
}

/**
* @private
*/
private var _tintColor:Number = 0x000000;

/**
* The tinting color value in the 0xRRGGBB format.
*
*
* @default 0x000000 (black)
*/
public function get tintColor():uint
{
return this._tintColor;
}

/**
* @private (setter)
*/
public function set tintColor(value:uint):void
{
this.setTint(value, this.tintMultiplier);
}

// Capable of deriving a tint color from the color offsets,
// but the accuracy decreases as the tint multiplier decreases (rounding issues).
/**
* @private
*/
private function deriveTintColor():uint
{
var ratio:Number = 1 / (this.tintMultiplier);
var r:uint = Math.round(this.redOffset * ratio);
var g:uint = Math.round(this.greenOffset * ratio);
var b:uint = Math.round(this.blueOffset * ratio);
var colorNum:uint = r<<16 | g<<8 | b;
return colorNum;
}

/**
* @private
*/
private var _tintMultiplier:Number = 0;

/**
* The percentage to apply the tint color, as a decimal value between <code>0</code> and <code>1</code>.
* When <code>tintMultiplier = 0</code>, the target object is its original color and no tint color is visible.
* When <code>tintMultiplier = 1</code>, the target object is completely tinted and none of its original color is visible.
* @default 0
*/
public function get tintMultiplier():Number
{
return this._tintMultiplier;
}

/**
* @private (setter)
*/
public function set tintMultiplier(value:Number):void
{
this.setTint(this.tintColor, value);
}

/**
* Creates a Color instance from XML.
*
* @param xml An E4X XML object containing a <code><color></code> node from Motion XML.
*
* @return A Color instance that matches the XML description.
*/
public static function fromXML(xml:XML):Color
{
return Color((new Color()).parseXML(xml));
}

/**
* @private
*/
private function parseXML(xml:XML=null):Color
{
if (!xml) return this;

var firstChild:XML = xml.elements()[0];
if (!firstChild) return this;

//// ATTRIBUTES
for each (var att:XML in firstChild.attributes())
{
var name:String = att.localName();
if (name == 'tintColor')
{
var tintColorNumber:uint = Number(att.toString()) as uint;
this.tintColor = tintColorNumber;
}
else
{
this[name] = Number(att.toString());
}
}

return this;
}

/**
* Blends smoothly from one ColorTransform object to another.
*
* @param fromColor The starting ColorTransform object.
*
* @param toColor The ending ColorTransform object.
*
* @param progress The percent of the transition as a decimal, where <code>0</code> is the start and <code>1</code> is the end.
*
* @return The interpolated ColorTransform object.
*/
public static function interpolateTransform(fromColor:ColorTransform, toColor:ColorTransform, progress:Number):ColorTransform
{
var q:Number = 1-progress;
var resultColor:ColorTransform = new ColorTransform
(
fromColor.redMultiplier*q   + toColor.redMultiplier*progress
, fromColor.greenMultiplier*q + toColor.greenMultiplier*progress
, fromColor.blueMultiplier*q  + toColor.blueMultiplier*progress
, fromColor.alphaMultiplier*q + toColor.alphaMultiplier*progress
, fromColor.redOffset*q       + toColor.redOffset*progress
, fromColor.greenOffset*q     + toColor.greenOffset*progress
, fromColor.blueOffset*q      + toColor.blueOffset*progress
, fromColor.alphaOffset*q     + toColor.alphaOffset*progress
)
return resultColor;
}

/**
* Blends smoothly from one color value to another.
*
* @param fromColor The starting color value, in the 0xRRGGBB or 0xAARRGGBB format.
*
* @param toColor The ending color value, in the 0xRRGGBB or 0xAARRGGBB format.
*
* @param progress The percent of the transition as a decimal, where <code>0</code> is the start and <code>1</code> is the end.
*
* @return The interpolated color value, in the 0xRRGGBB or 0xAARRGGBB format.
*/
public static function interpolateColor(fromColor:uint, toColor:uint, progress:Number):uint
{
var q:Number = 1-progress;
var fromA:uint = (fromColor >> 24) & 0xFF;
var fromR:uint = (fromColor >> 16) & 0xFF;
var fromG:uint = (fromColor >>  8) & 0xFF;
var fromB:uint =  fromColor        & 0xFF;

var toA:uint = (toColor >> 24) & 0xFF;
var toR:uint = (toColor >> 16) & 0xFF;
var toG:uint = (toColor >>  8) & 0xFF;
var toB:uint =  toColor        & 0xFF;

var resultA:uint = fromA*q + toA*progress;
var resultR:uint = fromR*q + toR*progress;
var resultG:uint = fromG*q + toG*progress;
var resultB:uint = fromB*q + toB*progress;
var resultColor:uint = resultA << 24 | resultR << 16 | resultG << 8 | resultB;
return resultColor;
}
}
}