放大和缩小AS3 [英] Zooming in and out in AS3

问题描述

我正在制作一个文件，该文件需要能够使用鼠标中键滚动放大和缩小图像(转换为符号并指定实例名称).我写过类似的东西:

I'm making a file where I need to be able to zoom in and out on an Image (Converted to a symbol and given an instance name) using the middle mouse scroller. I've written something similar to :

image1.addEventListener(MouseEvent.MOUSE_WHEEL, function1){
image1 = image 1 +50;
}

因此所有滚动都可以增加图像的大小，但是如果我向后滚动鼠标滚轮，它将滚动出图像，该怎么做呢? 据我了解，MOUSE_WHEEL没有相反的操作.

so all the scrolling works to increase the image size, but what can I do to make it where if I scroll back the mouse wheel, it scrolls out of the image? From what I understand, there is no converse operation to MOUSE_WHEEL.

推荐答案

MouseEvent :: delta 指示用户旋转鼠标滚轮的每个单位应滚动多少行.正增量值表示向上滚动；正值表示向上滚动.负值表示向下滚动.

MouseEvent::delta Indicates how many lines should be scrolled for each unit the user rotates the mouse wheel. A positive delta value indicates an upward scroll; a negative value indicates a downward scroll.

检查事件增量值是正还是负，并使用scaleX和scaleY缩放图像.

Check if event delta value is positive or negative and scale the image using scaleX and scaleY.

var zoomAmount:Number = 0.1;
stage.addEventListener(MouseEvent.MOUSE_WHEEL, zooom);

function zoom(event:MouseEvent):void {
    if(event.delta > 0) {
        image1.scaleX += zoomAmount;
        image1.scaleY += zoomAmount;
    } else {
        image1.scaleX -= zoomAmount;
        image1.scaleY -= zoomAmount;
    }
}

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