旋转位图数据在AS3 180deg出口 [英] Rotate bitmap data in AS3 180deg for export

问题描述

我在AS3闪存的位图，我使用base64连接codeD JPG格式的字符串发送过来的JavaScript。

所有这一切的伟大工程。我需要发送的IMG在缩小，并且旋转180deg。缩放工作，但不旋转。旋转从未发生。我知道林很显然做错了，但不知道正确的方式。

所以基本上我只需要旋转图像180deg所以当它发送到JavaScript是颠倒了。

下面是我的变换code

  VAR比例因子：INT = 5;

VAR tempBitmap：的BitmapData =新的BitmapData（img.width /比例因子，img.height /比例因子）;
变种drawMatrix：矩阵=新的Matrix（1 /比例因子，0，0，1 /比例因子）;
drawMatrix.rotate（Math.PI）; // 180deg

tempBitmap.draw（IMG，drawMatrix）;
 

解决方案

我想你需要翻译旋转，否则它就会被裁剪等以后你的对象，你没有看到它，我做了一个例子，在一个影片剪辑的位图只是使用CS5的阶段。

 匹配import flash.display.Bitmap;
进口flash.display.BitmapData;
进口的flash.display.MovieClip;

VAR比例因子：INT = 1;

VAR tempBitmap：的BitmapData =新的BitmapData（img.width，img.height）;

VAR rotationMatrix：矩阵=新的Matrix（）;
rotationMatrix.rotate（Math.PI）;
rotationMatrix.translate（img.width，img.height）;

tempBitmap.draw（box_mc的，rotationMatrix）;
VAR输出：位图=新位图（tempBitmap）;

的addChild（输出）;
 

我没惹缩放，你可以这样做你自己，我猜。一个我放在舞台右侧的位图数据得出的一个是舞台的左上角，并正确地反转。

更新

另外看看<一href="http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/fl/motion/MatrixTransformer.html#rotateAroundExternalPoint%28%29"相对=nofollow> fl.motion.MatrixTransformer 按如下32bitkid评论！

I have a bitmap in AS3 flash and I am sending it over to javascript using a base64 encoded jpg string.

All that works great. I need to send the img over scaled down, and rotated 180deg. The scaling works, but not the rotation. The rotation never takes. I know Im am obviously doing it wrong, but don't know the right way.

So basically I just need to rotate the image 180deg so when it is sent to javascript it is upside down.

Here is my transform code

var scaleFactor:int = 5;

var tempBitmap:BitmapData = new BitmapData(img.width/scaleFactor, img.height/scaleFactor);
var drawMatrix:Matrix = new Matrix(1/scaleFactor, 0, 0, 1 /scaleFactor );
drawMatrix.rotate(Math.PI); //180deg

tempBitmap.draw(img, drawMatrix);

解决方案

I think you need to translate your object after rotation otherwise it gets clipped so you don't see it, I did an example with a bitmap in a MovieClip just on the stage using CS5.

import flash.display.Bitmap;
import flash.display.BitmapData;
import flash.display.MovieClip;

var scaleFactor:int = 1;

var tempBitmap:BitmapData = new BitmapData(img.width, img.height);

var rotationMatrix:Matrix = new Matrix();
rotationMatrix.rotate(Math.PI);
rotationMatrix.translate(img.width, img.height);

tempBitmap.draw(box_mc, rotationMatrix);
var output:Bitmap = new Bitmap(tempBitmap);

addChild(output);

I didn't mess with the scaling, you can do that yourself I guess. The one I put on the stage is on the right, the bitmapData drawn one is top left of stage, and correctly inverted.

UPDATE

Also have a look at fl.motion.MatrixTransformer as per 32bitkid comment below!

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