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我正在尝试通过单击和双击鼠标事件来放大和缩小蒙面鼠标平移图像。我让图像放大，但它总是放大左边缘注册点，而不是我点击的地方。我完全不知道如何编写代码，并且在互联网上花了一整天的时间试图弄清楚但没有运气。我希望有人可以帮助我解决这个问题！

import com.greensock.*;//Greensock Tweening Platform.

//Variables
var percX:Number;
var percY:Number;
var destX:Number;
var destY:Number;

//Image panned and masked
this.mask = mask_mc;
stage.addEventListener(MouseEvent.MOUSE_MOVE,mousemove);
function mousemove(e:MouseEvent) {
    if (mask_mc.hitTestPoint(stage.mouseX,stage.mouseY,false)) {
        if (imgLoader.width>mask_mc.width) {//Avoids Scrolling if image is under mask area width
            percX = mask_mc.mouseX/mask_mc.width;
        }
        if (imgLoader.height>mask_mc.height) {//Avoids Scrolling if image is under mask area height
            percY = mask_mc.mouseY/mask_mc.height;
        }
        destX = -(imgLoader.width-mask_mc.width)*percX;
        destY = -(imgLoader.height-mask_mc.height)*percY;
        TweenMax.to(imgLoader,.5,{x:destX,y:destY});
    }
}
//Add listeners for the imgLoader movie clip.
imgLoader.doubleClickEnabled = true;  
imgLoader.addEventListener(MouseEvent.CLICK, increaseSize);
imgLoader.addEventListener(MouseEvent.DOUBLE_CLICK, decreaseSize);

//This function increases the scale of the image
function increaseSize(event:MouseEvent):void{
TweenLite.to(imgLoader, 1, {scaleX:2, scaleY:2});
}

//This function decreases the scale of the image
function decreaseSize(event:MouseEvent):void{
TweenLite.to(imgLoader, 1, {scaleX:1, scaleY:1});
}
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3 回答 3

2

这个答案来自这里

添加此功能：

function scaleAroundMouse(objectToScale:DisplayObject, scaleAmount:Number, bounds:Rectangle = null, onComplete:Function = null):TweenLite {
    // scaling will be done relatively
    var relScaleX:Number = scaleAmount / objectToScale.scaleX;
    var relScaleY:Number = scaleAmount / objectToScale.scaleY;
    // map vector to centre point within parent scope

    var scalePoint:Point = objectToScale.localToGlobal( new Point(objectToScale.mouseX, objectToScale.mouseY));
    scalePoint = objectToScale.parent.globalToLocal( scalePoint );
    // current registered postion AB
    var AB:Point = new Point( objectToScale.x, objectToScale.y );
    // CB = AB - scalePoint, objectToScale vector that will scale as it runs from the centre
    var CB:Point = AB.subtract( scalePoint );
    CB.x *= relScaleX;
    CB.y *= relScaleY;
    // recaulate AB, objectToScale will be the adjusted position for the clip
    AB = scalePoint.add( CB );
    // set actual properties

    if(bounds){
     var limits:Rectangle = new Rectangle(
        bounds.x + (bounds.width - (objectToScale.width * relScaleX)),
        bounds.y + (bounds.height - (objectToScale.height * relScaleY)),
        (objectToScale.width * relScaleX) - bounds.width,
        (objectToScale.height * relScaleY) - bounds.height
     );

     if(AB.x < limits.x) AB.x = limits.x;
     if(AB.x > limits.x + limits.width) AB.x = limits.x + limits.width;
     if(AB.y < limits.y) AB.y = limits.y;
     if(AB.y > limits.y + limits.height) AB.y = limits.y + limits.height;       
    }

    return TweenLite.to(objectToScale,1,{onComplete: onComplete, scaleX: scaleAmount, scaleY: scaleAmount, x: AB.x, y: AB.y);
}

然后将您的大小调整功能更新为：

function increaseSize(event:MouseEvent):void{
    stopMouseMove();
    scaleAroundMouse(imgLoader, 2, null, resumeMouseMove);
}

function decreaseSize(event:MouseEvent):void{
    stopMouseMove();
    scaleAroundMouse(imgLoader, 1, null, resumeMouseMove);
}

function stopMouseMove():void {
   stage.removeEventListener(MouseEvent.MOUSE_MOVE,mousemove);
}

function resumeMouseMove():void {
   stage.addEventListener(MouseEvent.MOUSE_MOVE,mousemove);
}

我还在函数中添加了一个 bounds 参数。如果您不希望内容的边缘在蒙版中可见，这将非常有用。因此，如果您可以通过将掩码的边界传递给函数来使用它：

scaleAroundMouse(imgLoader, 1, myMask.getBounds(this));
于 2012-11-05T22:17:55.770 回答
0

此示例使用缩放效果类，可能有助于实现您正在寻找的缩放效果http://graphics-geek.blogspot.com/2010/06/video-image-zoom-effect-in-flex-4.html。

于 2012-11-05T23:04:41.360 回答
0 
var mat:Matrix=new Matrix();
mat.translate(-p.x,-p.y);
mat.scale(desiredScale,desiredScale);
mat.translate(p.x,p.y);
yourObject.transform.matrix=mat;

这取自我大约一个月前发布的一个问题。你可以在这里看到它。虽然我最终没有使用那个特定的片段（实际上我使用了已发布的脚本 LondongDrugs_MediaServ 的修改版本），但它可以工作并且更容易理解和实施。

于 2012-11-05T23:23:28.030 回答