AS3规模母公司三菱商事的中心，孩子三菱商事的中心

问题描述

下面code中心的负载状态格鲁吉亚父剪辑mapcontainer.themap。但是，当我尝试规模mapcontainer.themap，它不围绕规模格鲁吉亚的中心。如何缩放的时候我一直在佐治亚州的中心？

  //这将设置父剪辑所以它集中在孩子格上载片段
变种y值：数= mapcontainer.themap.georgia.y;
VAR与xValue：数= mapcontainer.themap.georgia.x;
VAR xDiff：数= mapcontainer.themap.width / 2;
VAR yDiff：数= mapcontainer.themap.height / 2;
如果（xDiff＆GT; stage.stageWidth / 2 || yDiff＆GT; stage.stageHeight / 2）{
    与xValue = -xValue;
    y值= -yValue;
}
mapcontainer.themap.x =与xValue;
mapcontainer.themap.y = y值;

//这一行？
mapcontainer.themap.scaleX = mapcontainer.themap.scaleY = 2;
 

解决方案

下面是从的

 保护功能scaleAround（objectToScale：的DisplayObject，scalePoint：点，scaleAmount：编号）：无效{
    //比例会相对完成
    VAR relScaleX：数= scaleAmount / objectToScale.scaleX;
    VAR relScaleY：数= scaleAmount / objectToScale.scaleY;
    //地图矢量父范围内的中心点

    scalePoint = objectToScale.localToGlobal（scalePoint）;
    scalePoint = objectToScale.parent.globalToLocal（scalePoint）;
    //目前注册现在的位置是AB
    变种AB：点=新的点（objectToScale.x，objectToScale.y）;
    // CB = AB  -  scalePoint，objectToScale矢量，将缩放，因为它从中心运行
    变种CB：点= AB.subtract（scalePoint）;
    CB.x * = relScaleX;
    CB.y * = relScaleY;
    // recaulate AB，objectToScale将是剪辑的调整后的位置
    AB = scalePoint.add（CB）;
    //设置实际属性
    objectToScale.scaleX * = relScaleX;
    objectToScale.scaleY * = relScaleY;
    objectToScale.x = AB.x;
    objectToScale.y = AB.y;
}
 

因此​​，对于你的情况，你可以这样做：

  scaleAround（mapcontainer.themap，新点（mapcontainer.themap.georgia.x，mapcontainer.themap.georgia.y），2）
 

The following code centers the parent clip "mapcontainer.themap" on the state Georgia on load. However, when i try to scale mapcontainer.themap, it doesnt scale around Georgia's center. How do i keep Georgia in the center when scaling?

//This sets the parent clip so it's centered on the child "georgia" clip on load
var yValue:Number = mapcontainer.themap.georgia.y;
var xValue:Number = mapcontainer.themap.georgia.x;
var xDiff:Number = mapcontainer.themap.width/2;
var yDiff:Number = mapcontainer.themap.height/2;
if (xDiff > stage.stageWidth/2 || yDiff > stage.stageHeight/2) {
    xValue = -xValue;
    yValue = -yValue;
}
mapcontainer.themap.x = xValue;
mapcontainer.themap.y = yValue;

//This line?
mapcontainer.themap.scaleX = mapcontainer.themap.scaleY = 2;

解决方案

Here is a function derived from here

protected function scaleAround(objectToScale:DisplayObject, scalePoint:Point, scaleAmount:Number ):void {
    // 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

    scalePoint = objectToScale.localToGlobal( scalePoint );
    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
    objectToScale.scaleX *= relScaleX;
    objectToScale.scaleY *= relScaleY;
    objectToScale.x = AB.x;
    objectToScale.y = AB.y;
}

So for your scenario, you could do this:

scaleAround(mapcontainer.themap,new Point(mapcontainer.themap.georgia.x,mapcontainer.themap.georgia.y),2)

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