如何通过动作脚本在Sprite或Shape上设置注册点（我知道使用Flash很简单，但我需要在动作脚本中完成它）
答案 0 :(得分：12)
Flash Player API不会公开此内容。我相信这是因为Flash在创建SWF时实际上将注册点烘焙到形状数据中。因此，没有实际的注册点可以移动（相反，您可以移动形状数据......如果Flash Player允许您编辑形状数据！）。
我总是通过简单地将我的精灵/形状变为另一个DisplayObject来解决这个问题。所以，如果我有spriteA并希望将其注册点设置为（15,35），我会这样做：
var spriteB:Sprite = new Sprite();
spriteB.addChild(spriteA);
spriteA.x = 15;
spriteA.y = 35;
然后从那时开始，在我之前提到spriteA的地方引用spriteB。
答案 1 :(得分：5)
使用变换矩阵这是可能的。以下是this site上的一个很好的实现。
public function setRegistrationPoint(s:Sprite, regx:Number, regy:Number, showRegistration:Boolean )
{
//translate movieclip
s.transform.matrix = new Matrix(1, 0, 0, 1, -regx, -regy);
//registration point.
if (showRegistration)
{
var mark:Sprite = new Sprite();
mark.graphics.lineStyle(1, 0x000000);
mark.graphics.moveTo(-5, -5);
mark.graphics.lineTo(5, 5);
mark.graphics.moveTo(-5, 5);
mark.graphics.lineTo(5, -5);
s.parent.addChild(mark);
}
}
答案 2 :(得分：2)
指的是索引？
跟进评论，你可以像下面这样快速实施。 这不完全是您想要的，因为您无法为每个孩子设置不同的对齐方式。 我只是不想让它太复杂，它更像是'工作伪代码'来给你一个想法...
package
{
import flash.display.DisplayObject;
import flash.display.Sprite;
public class SpriteWithRegistration extends Sprite
{
private var _regV:String = "T";
private var _regH:String = "L";
private var _width:Number = 0;
private var _height:Number = 0;
public function SpriteWithRegistration(width:Number, height:Number, registrationPoint:String = "TL")
{
this.width = height;
this.height = width;
this.registrationPoint = registrationPoint;
}
public function set registrationPoint(p:String):void
{
if(p.length != 2) return;
var regV:String = p.toUpperCase().substr(0, 1);
var regH:String = p.toUpperCase().substr(1, 1);
_regV = (regV == "T" || regV == "C" || regV == "B" ) ? regV : _regV;
_regH = (regH == "L" || regH == "C" || regH == "R" ) ? regH : _regH;
alignChildren();
}
override public function addChild(child:DisplayObject):DisplayObject
{
alignChild(child);
super.addChild(child);
return child;
}
override public function set width(value:Number):void
{
_width = value;
alignChildren();
}
override public function get width():Number
{
return _width;
}
override public function set height(value:Number):void
{
_height = value;
alignChildren();
}
override public function get height():Number
{
return _height;
}
private function alignChildren():void
{
for(var index:int = 0;index < numChildren; index++ )
alignChild(getChildAt(index));
}
private function alignChild(disp:*):void
{
switch(_regH)
{
case "L": disp.x = 0; break;
case "C": disp.x = _width*.5 - disp.width * .5; break;
case "R": disp.x = _width - disp.width; break;
}
switch(_regV)
{
case "T": disp.y = 0; break;
case "C": disp.y = _height*.5 - disp.height * .5; break;
case "B": disp.y = _height - disp.height; break;
}
}
}
}
答案 3 :(得分：1)
我希望这会对某人有所帮助。 Starling框架有一个很棒的方法叫做＃34; alignPivot（）＆＃34;。我采用了他们的概念并将其改编为Flash DisplayList。你基本上告诉一个精灵将它的注册改为左，右，中，上和下。此代码将您的精灵放入容器精灵中并适当地定位自己。它返回包含内部原始精灵的容器精灵。
代码存储在一个单独的名为，＆＃34; Position＆＃34;中。
public static function alignPivot(s:DisplayObject, horizontalAlign: String = "center", verticalAlign: String = "center", showRegistration: Boolean = false, _color: uint = 0x000000): Sprite {
//create a container sprite to house the sprite you'd like to move
var _container: Sprite = new Sprite();
//add your sprite to the continer sprite (the container sprite is what will be returned)
_container.addChild(s);
//using getBounds(), find the x,y,width,and height of your sprite within the continer.
var bounds:Rectangle = _container.getBounds(s);
//create variables for x and y cooridnates
var xVal: Number;
var yVal: Number;
//I have a separate class called Align which contains public static constants for positiong.
//Check the values passed above and get the correct x value;
if (horizontalAlign == Align.LEFT) xVal = -bounds.x;
else if (horizontalAlign == Align.CENTER) xVal = -bounds.x - bounds.width * .5;
else if (horizontalAlign == Align.RIGHT) xVal = -bounds.x - bounds.width;
else throw new ArgumentError("Invalid horizontal alignment: " + horizontalAlign);
//Check the values passed above and get the correct y value;
if (verticalAlign == Align.TOP) yVal = -bounds.y;
else if (verticalAlign == Align.CENTER) yVal = -bounds.y - bounds.height * .5;
else if (verticalAlign == Align.BOTTOM) yVal = -bounds.y - bounds.height;
else throw new ArgumentError("Invalid vertical alignment: " + verticalAlign);
//apply the new x and y cooridnates to your sprite (the one moving within the container we created above)
s.x = xVal;
s.y = yVal;
//optional - this will create a small X at the 0,0 position of the container.
//This is helpful if you want to see where your registration points are
if (showRegistration) {
var mark: Sprite = new Sprite();
mark.graphics.lineStyle(1, _color);
mark.graphics.moveTo(-5, -5);
mark.graphics.lineTo(5, 5);
mark.graphics.moveTo(-5, 5);
mark.graphics.lineTo(5, -5);
_container.addChild(mark);
}
//return your contianer sprite
//This will replace the sprite that you passed in the first parameter.
//That sprite is inside the container, so you won't notice
return _container;
}
实现：
//Create your sprite
var _holder: Sprite = new Sprite();
//Create a shape to put in your sprite
var my_shape: Shape = new Shape();
my_shape.graphics.beginFill(0x000000);
my_shape.graphics.drawRect(0, 0, 200, 100);
my_shape.graphics.endFill();
//Add the shape to your sprite
_holder.addChild(my_shape);
//Align the holder (must be done AFTER all children have been added)
//This will put the registration point at the top-center of the sprite.
//_holder is replaced by a sprite (container) that contains _holder.
//The _holder inside the container is positioned appropriately.
_holder = Position.alignPivot(_holder,Align.CENTER, Align.TOP);
//Add the new sprite to your stage.
this.addChild(_holder);
常量列表，因此您不必自己编写它们：
public static const CENTER:String = "center";
public static const LEFT:String = "left";
public static const RIGHT:String = "right";
public static const TOP:String = "top";
public static const BOTTOM:String = "bottom";
答案 4 :(得分：0)