blocks|key|1706619|text|嗯，最简单的解决方案是为sprite提供一个半透明的mask，并将mask和Sprite的cacheAsBitmap设置为true。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1706620|entityMap^0|Q|4|X|4|12|6|19|D|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]|$9|M|A|N|B|C]|$9|O|A|P|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|G|$]]

Well, most simple solution is to give the sprite a semi-transparent <code>mask</code>, and set <code>cacheAsBitmap</code> to true for both the <code>mask</code> and the <code>Sprite</code>.

blocks|key|4974787|text|也许组合使用LAYER和ERASE+BlendMode可以实现您的目标：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|4974788|示例：|4974789|import+flash.display.BlendMode;
import+flash.display.Graphics;
import+flash.display.Sprite;
import+flash.geom.Rectangle;

public+class+PunchTest+extends+Sprite+{
++++private+var+punchSprite:Sprite+=+new+Sprite();

++++public+function+doPunch(target:Sprite,+rect:Rectangle):void+{
++++++++var+g:Graphics+=+punchSprite.graphics;
++++++++g.clear();
++++++++g.beginFill(0,+1);
++++++++g.drawRect(rect.x,+rect.y,+rect.width,+rect.height);
++++++++g.endFill();
++++++++punchSprite.blendMode+=+BlendMode.ERASE;
++++++++target.blendMode+=+BlendMode.LAYER;
++++++++target.addChild(punchSprite);
++++}

++++public+function+PunchTest()+{
++++++++super();
++++++++var+g:Graphics+=+graphics;

++++++++//+draw+a+red+backgound
++++++++g.beginFill(0xff0000,+1);
++++++++g.drawRect(0,+0,+500,+500);
++++++++g.endFill();

++++++++//+add+a+blue+coverring+sprite+at+0.5+alpha
++++++++var+coverSprite:Sprite+=+new+Sprite();
++++++++g+=+coverSprite.graphics;
++++++++g.beginFill(0x00ff00,+0.5);
++++++++g.drawRect(50,+50,+300,+300);
++++++++g.endFill();
++++++++addChild(coverSprite);

++++++++//+do+a+hole+into+the+cover+sprite
++++++++doPunch(coverSprite,+new+Rectangle(80,+80,+100,+100));
++++}
}|code-block|syntax|javascript|4974790|entityMap|0|LINK|mutability|MUTABLE|url|http://help.adobe.com/en_US/AS3LCR/Flash_10.0/flash/display/BlendMode.html#LAYER|1|http://help.adobe.com/en_US/AS3LCR/Flash_10.0/flash/display/BlendMode.html#ERASE^0|6|5|0|C|5|1|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@$A|V|B|W|1|X]|$A|Y|B|Z|1|10]]|C|$]]|$1|D|3|E|5|6|7|11|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|12|8|@]|9|@]|C|$I|J]]|$1|K|3|-4|5|6|7|13|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]|S|$5|N|O|P|C|$Q|T]]]]

Perhaps using a combination of <a href="http://help.adobe.com/en_US/AS3LCR/Flash_10.0/flash/display/BlendMode.html#LAYER" rel="nofollow noreferrer">LAYER</a> and <a href="http://help.adobe.com/en_US/AS3LCR/Flash_10.0/flash/display/BlendMode.html#ERASE" rel="nofollow noreferrer">ERASE</a> BlendMode will do what you want:

Example:

<pre><code>import flash.display.BlendMode;
import flash.display.Graphics;
import flash.display.Sprite;
import flash.geom.Rectangle;

public class PunchTest extends Sprite {
 private var punchSprite:Sprite = new Sprite();

 public function doPunch(target:Sprite, rect:Rectangle):void {
 var g:Graphics = punchSprite.graphics;
 g.clear();
 g.beginFill(0, 1);
 g.drawRect(rect.x, rect.y, rect.width, rect.height);
 g.endFill();
 punchSprite.blendMode = BlendMode.ERASE;
 target.blendMode = BlendMode.LAYER;
 target.addChild(punchSprite);
 }

 public function PunchTest() {
 super();
 var g:Graphics = graphics;

 // draw a red backgound
 g.beginFill(0xff0000, 1);
 g.drawRect(0, 0, 500, 500);
 g.endFill();

 // add a blue coverring sprite at 0.5 alpha
 var coverSprite:Sprite = new Sprite();
 g = coverSprite.graphics;
 g.beginFill(0x00ff00, 0.5);
 g.drawRect(50, 50, 300, 300);
 g.endFill();
 addChild(coverSprite);

 // do a hole into the cover sprite
 doPunch(coverSprite, new Rectangle(80, 80, 100, 100));
 }
}
</code></pre>

Here is my problem : 
I have a Sprite covering the entire screen. 
Other than a certain rectangle of this sprite 
I want the rest of the sprite to have alpha = 0.5. 
And for that particular rectangle, I want alpha = 0. 
Is it possible? How?

Diffrent values of alpha for different regions of a sprite(Flex/Actionscript)

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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这就是我的问题：我让雪碧酒覆盖了整个屏幕。除了这个精灵的某个矩形之外我希望精灵的其余部分具有alpha = 0.5。对于这个特定的矩形，我希望alpha = 0。有可能吗？多么?

问子画面不同区域的alpha值不同(Flex/Actionscript)
EN

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问子画面不同区域的alpha值不同(Flex/Actionscript)EN