如何修改此调整大小脚本以填充/裁剪到容器？

Question

我有一个简单的脚本，可以调整加载图像的大小以适应特定的宽度和高度，但是我希望该选项能够填充，即居中并裁剪到特定的宽度/高度 - 关于我如何做的任何想法修改这个？

当前脚本：

function resizeImg(mc:MovieClip, maxW:Number, maxH:Number=0, constrainProportions:Boolean=true):void{
    maxH = maxH == 0 ? maxW : maxH;
    mc.width = maxW;
    mc.height = maxH;
    if (constrainProportions) {
        mc.scaleX < mc.scaleY ? mc.scaleY = mc.scaleX : mc.scaleX = mc.scaleY;
    }
}

我尝试从 Soulwire (http://blog.soulwire.co.uk/flash/actionscript-3/fit-a-displayobject-into-a-rectangle) 中挑选 DisplayUtils AS3 类的代码，但它很漂亮很好混淆并且没有cmets所以我很挣扎:(

Answer 1

为此，您首先需要存储原始宽度和高度，以便使用它来缩放图像。除此之外，您需要屏蔽图像并使用您的 maxW 和 maxH 值作为它的尺寸。之后你就可以使用这样的函数了：

function resizeImg(mc:Sprite, maxW:Number, maxH:Number = 0, constrainProportions:Boolean = true) : void
{
    maxH = maxH == 0 ? maxW : maxH;

    if(constrainProportions)
    {

        // First of we'll make the mc fit within the viewport

        // calulate the difference between the max and stored dimensions
        var dX:Number = maxW - originalWidth;
        var dY:Number = maxH - originalHeight;

        // evaluate values
        if (dY > dX)
        {

            // mc is wider then maxW
            // set width to max and scaleY to offset of width
            mc.width = maxW;
            mc.scaleY = mc.scaleX;
        }
        else
        {
            // mc is heigher then maxH
            // set height to max and scaleX to offset of height 
            mc.height = maxH;
            mc.scaleX = mc.scaleY;
        }

        // the mc now fits within the max viewport
        // now we'll use the same trick to fill the resized mc in the max viewport

        var dXcorrection:Number = maxW - mc.width;
        var dYcorrection:Number = maxH - mc.height;

        if (dYcorrection < dXcorrection)
        {
            mc.width = maxW;
            mc.scaleY = mc.scaleX;
        }
        else
        {
            mc.height = maxH;
            mc.scaleX = mc.scaleY;
        }


        // finally we'll center the resized mc within the max viewport 
        mc.x = (maxW - mc.width)/2;
        mc.y = (maxH - mc.height)/2;
    }
}