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AS3 - 缩放位图数据
原标题:AS3 - Scale BitmapData

我想将BitmapData 缩放为200、400、600和800等不同大小。

这样做的好办法是什么?

最佳回答

You can t directly scale a BitmapData but you can make a scaled clone of it. Here is a quick example for scaling a BitmapData :

package {
import flash.display.Bitmap;
import flash.display.BitmapData;
import flash.display.Sprite;
import flash.geom.Matrix;

import mx.core.BitmapAsset;

public class Test extends Sprite {


    [Embed(source="test.jpg")]
    private var Image:Class;

    public function Test() {

        var originalBitmapData:BitmapData = BitmapAsset(new Image()).bitmapData;

        function scaleBitmapData(bitmapData:BitmapData, scale:Number):BitmapData {
            scale = Math.abs(scale);
            var width:int = (bitmapData.width * scale) || 1;
            var height:int = (bitmapData.height * scale) || 1;
            var transparent:Boolean = bitmapData.transparent;
            var result:BitmapData = new BitmapData(width, height, transparent);
            var matrix:Matrix = new Matrix();
            matrix.scale(scale, scale);
            result.draw(bitmapData, matrix);
            return result;
        }

        var bitmapA:Bitmap = new Bitmap(originalBitmapData);
        addChild(bitmapA);

        var bitmapB:Bitmap = new Bitmap(scaleBitmapData(originalBitmapData, 0.5));
        addChild(bitmapB);

    }
}
}
问题回答

设置该图像的位图对象的宽度和高度, 从而用您的位图Data创建一个位图, 然后使用宽度/ 高度进行缩放, 或者使用比例X/ Y, 如果您想要使用缩放值的话 。

var bmp:Bitmap = new Bitmap(bmpData);
bmp.width = 400; //  or 600,800 etc.
bmp.height = 400;

If you don t want to use a bitmap object and directy scale the BitmapData see this What is the best way to resize a BitmapData object?





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