我必须为简单的皱纹修饰构建一个flash应用程序。用户应该能够上传肖像照片,选择褶皱区域,然后将模糊滤镜应用于所选部分。我的问题是 - 是否可以将过滤器应用于自由形式区域?我知道选择矩形会很容易,但这对于真正标记正确的区域并不是很有用。理想情况下,用户应该使用某种圆形笔刷来标记区域,按“确定”然后应用过滤器。 有没有办法做到这一点?您是否可以获得有关如何处理此任务的进一步建议?我对使用ActionScript操作位图数据的经验很少。
任何帮助表示赞赏!非常感谢提前: - )
答案 0 :(得分:3)
算法如下:
BitmapData.draw()
创建一个选择形状的BitmapData(让它成为A)Bitmapdata.copyPixels()
为模糊区域添加一些边距(让它为B)。BitmapData.threshold()
。Bitmapdata.copyPixels()
这是一个完整而有效的例子 在找出解决方案时,我还是编写了代码 希望你发现它很有用。
package
{
import flash.display.Bitmap;
import flash.display.BitmapData;
import flash.display.Loader;
import flash.display.Shape;
import flash.display.Sprite;
import flash.display.StageAlign;
import flash.display.StageScaleMode;
import flash.events.Event;
import flash.filters.BlurFilter;
import flash.geom.Matrix;
import flash.geom.Point;
import flash.geom.Rectangle;
import flash.net.URLRequest;
import flash.system.LoaderContext;
[SWF(width="800", height="600",backgroundColor="#FFFFFF")]
public class TestBlur extends Sprite
{
private const loader:Loader = new Loader();
public function TestBlur()
{
stage.align = StageAlign.TOP_LEFT;
stage.scaleMode = StageScaleMode.NO_SCALE;
loader.contentLoaderInfo.addEventListener(Event.COMPLETE, onLoadComplete);
loader.load(new URLRequest("http://i.stack.imgur.com/u3iEv.png"), new LoaderContext(true));
}
protected function onLoadComplete(event:Event):void
{
trace(event);
var bmp:Bitmap = loader.content as Bitmap;
addChild(bmp);
// create some test selection area
var selection:Shape = new Shape();
selection.graphics.lineStyle(30, 0xFF0000, .5);
selection.graphics.curveTo(75, -50, 200, 10);
selection.x = 40;
selection.y = 60;
addChild(selection);
// create a duplicate of the original image
var target:BitmapData = bmp.bitmapData.clone();
var targetBmp:Bitmap = new Bitmap(target);
targetBmp.x = bmp.x + bmp.width;
addChild(targetBmp);
//
// *** main work starts here ***
// by now we have selection shape and a bitmap to blur
const destPoint:Point = new Point();
const drawMatrix:Matrix = new Matrix();
const blurMargin:uint = 10;
const blur:BlurFilter = new BlurFilter(2, 2, 3);
var rect:Rectangle;
// 0: prepare an image of selection area
// we'll need it at step 3
rect = selection.getBounds(selection);
rect.x -= blurMargin;
rect.y -= blurMargin;
rect.width += blurMargin*2;
rect.height += blurMargin*2;
var selectionImage:BitmapData = new BitmapData(rect.width, rect.height, true, 0);
drawMatrix.identity();
drawMatrix.translate(-rect.x, -rect.y);
selectionImage.draw(selection, drawMatrix);
// just some testing
var test0:Bitmap = new Bitmap(selectionImage.clone());
test0.y = bmp.y + bmp.height;
addChild(test0);
// 1: cut a rectangular piece of original image that is covered by selection area
rect = selection.getBounds(selection.parent);
rect.x -= blurMargin;
rect.y -= blurMargin;
rect.width += blurMargin*2;
rect.height += blurMargin*2;
var area:BitmapData = new BitmapData(rect.width, rect.height, true, 0);
area.copyPixels(bmp.bitmapData, rect, destPoint);
// just some testing
var test1:Bitmap = new Bitmap(area.clone());
test1.y = bmp.y + bmp.height;
test1.x = test0.x + test0.width;
addChild(test1);
// 2: remove all pixels that are not covered by selection
area.threshold(selectionImage, area.rect, destPoint, "==", 0, 0, 0xFF000000);
// just some testing
var test2:Bitmap = new Bitmap(area.clone());
test2.y = test0.y + test0.height;
test2.x = test0.x;
addChild(test2);
// 3: blur copied area
area.applyFilter(area, area.rect, destPoint, blur);
// just some testing
var test3:Bitmap = new Bitmap(area.clone());
test3.y = test0.y + test0.height;
test3.x = test2.x + test2.width;
addChild(test3);
// 4: copy blurred pixels back to target image
destPoint.x = rect.x;
destPoint.y = rect.y;
target.copyPixels(area, area.rect, destPoint);
}
}
}