如何在 ActionScript 3.0 中用另一个图像遮盖图像

Question

我的问题是这样的，我的用户导入图像 FileReference 和我需要屏蔽它然后将其发送到服务器。

我的问题是这样的：我能够保留文件引用事件并且 将图像数据传输到我的画布中。我能够发送到服务器 屏蔽的结果。

但我无法掩盖用户加载的图像 我的画布。

Answer 1

这改变了情况，但变化不大。查看修改后的解决方案：

package {
import flash.display.Bitmap;
import flash.display.BitmapData;
import flash.display.Loader;
import flash.display.Sprite;
import flash.events.Event;
import flash.events.MouseEvent;
import flash.geom.Point;
import flash.geom.Rectangle;
import flash.net.FileFilter;
import flash.net.FileReference;

public class Test extends Sprite {

    private var _fileReference:FileReference;
    private var _fileFilter:FileFilter;
    private var _imageLoader:Loader;
    private var _maskLoader:Loader;
    private var _canvas:Sprite;

    private var _imageLoaded:Boolean = false;

    public function Test() {
        addEventListener(Event.ADDED_TO_STAGE, addedToStageListener, false, 0, true);
    }

    private function addedToStageListener(event:Event):void {
        removeEventListener(Event.ADDED_TO_STAGE, addedToStageListener);

        _fileReference = new FileReference();
        _fileReference.addEventListener(Event.SELECT, fileSelectedListener, false, 0, true);
        _fileReference.addEventListener(Event.COMPLETE, fileLoadCompleteListener, false, 0, true);

        _fileFilter = new FileFilter("Images", "*.jpg;*.gif;*.png");

        _imageLoader = new Loader();
        _imageLoader.contentLoaderInfo.addEventListener(Event.COMPLETE, imageLoadCompleteListener, false, 0, true);
        _maskLoader = new Loader();
        _maskLoader.contentLoaderInfo.addEventListener(Event.COMPLETE, maskLoadCompleteListener, false, 0, true);

        _canvas = new Sprite();
        addChild(_canvas);

        stage.addEventListener(MouseEvent.CLICK, mouseClickListener, false ,0, true);
    }

    private function mouseClickListener(event:Event):void {
        _fileReference.browse([_fileFilter]);
    }

    private function fileSelectedListener(event:Event):void {
        _fileReference.load();
    }

    private function fileLoadCompleteListener(event:Event):void {
        if (!_imageLoaded) {
            _imageLoader.loadBytes(event.target.data);
        } else {
            _maskLoader.loadBytes(event.target.data);
        }
    }

    private function imageLoadCompleteListener(event:Event):void {
        _imageLoaded = true;
    }

    private function maskLoadCompleteListener(event:Event):void {
        var imageBitmap:Bitmap = _imageLoader.content as Bitmap;
        var maskBitmap:Bitmap = _maskLoader.content as Bitmap;

        if (imageBitmap && maskBitmap) {
            var imageBitmapData:BitmapData = imageBitmap.bitmapData;
            var maskBitmapData:BitmapData = maskBitmap.bitmapData;

            var boundRectange:Rectangle = new Rectangle(0, 0, maskBitmap.width, maskBitmap.height);
            var destinationPoint:Point = new Point(0, 0);

            var finalBitmapData:BitmapData = new BitmapData(maskBitmap.width, maskBitmap.height);
            finalBitmapData.copyPixels(imageBitmapData, boundRectange, destinationPoint, maskBitmapData, destinationPoint);
            var finalBitmap:Bitmap = new Bitmap(finalBitmapData);

            while(_canvas.numChildren) {
                _canvas.removeChildAt(0);
            }
            _canvas.addChild(finalBitmap);
        }
    }
}}

首先单击舞台允许您选择蒙版图像。第二次单击允许您选择包含遮罩信息的图像（例如具有透明度的 png 文件）。希望这有帮助。

Answer 2

您只需将加载的位图添加到可屏蔽容器（例如 Sprite）。例如：
测试程序

package {
import flash.display.Graphics;
import flash.display.Loader;
import flash.display.Sprite;
import flash.events.Event;
import flash.events.MouseEvent;
import flash.net.FileFilter;
import flash.net.FileReference;

public class Test extends Sprite {

    private var _fileReference:FileReference;
    private var _fileFilter:FileFilter;
    private var _loader:Loader;
    private var _imageContainer:Sprite;
    private var _mask:Sprite;
    private var _canvas:Sprite;

    public function Test() {
        addEventListener(Event.ADDED_TO_STAGE, addedToStageListener, false, 0, true);
    }

    private function addedToStageListener(event:Event):void {
        removeEventListener(Event.ADDED_TO_STAGE, addedToStageListener);

        _fileReference = new FileReference();
        _fileReference.addEventListener(Event.SELECT, fileSelectedListener, false, 0, true);
        _fileReference.addEventListener(Event.COMPLETE, fileLoadCompleteListener, false, 0, true);

        _fileFilter = new FileFilter("Images", "*.jpg;*.gif;*.png");

        _loader = new Loader();
        _canvas = new Sprite();

        _mask = new Sprite();
        var maskGraphics:Graphics = _mask.graphics;
        maskGraphics.beginFill(0xFFFFFF);
        maskGraphics.drawCircle(50, 50, 50);
        maskGraphics.endFill();

        _imageContainer = new Sprite();
        _imageContainer.mask = _mask;

        _canvas.addChild(_imageContainer);
        _canvas.addChild(_mask);

        addChild(_canvas);

        stage.addEventListener(MouseEvent.CLICK, mouseClickListener, false ,0, true);
    }

    private function mouseClickListener(event:Event):void {
        _fileReference.browse([_fileFilter]);
    }

    private function fileSelectedListener(event:Event):void {
        _fileReference.load();
    }

    private function fileLoadCompleteListener(event:Event):void {
        _loader.loadBytes(event.target.data);

        while(_imageContainer.numChildren) {
            _imageContainer.removeChildAt(0);
        }
        _imageContainer.addChild(_loader);
    }
}}