Nape Physics ShapeDebug似乎是缩放的

时间:2013-11-17 16:36:49

标签: actionscript-3 flash debugging nape

我有一个简单的nape演示的奇怪问题...这是我的代码

package com.secretpackage {

   import flash.display.Sprite;
   import flash.events.Event;
   import flash.text.TextField;
   import nape.phys.Body;
   import nape.shape.Circle;
   import nape.space.Space;
   import nape.util.ShapeDebug;
   import nape.geom.Vec2;
   import nape.phys.BodyType;
   import nape.phys.Material;

   public class Main extends Sprite {

    // -------
    private var world_db:Space=new Space(new Vec2(0,1000));
    private var debug:ShapeDebug;
    private var napeDebugSprite:Sprite = new Sprite();
    private var sphere:Body;
    private var labels:TextField;
    // -------

    public function Main():void 
    {
        if (stage) init();
        else addEventListener(Event.ADDED_TO_STAGE, init);
    }

    private function init(e:Event = null):void 
    {
        removeEventListener(Event.ADDED_TO_STAGE, init);
        // entry point


        debug  = new ShapeDebug(stage.stageWidth, stage.stageHeight, stage.color);

        labels = new TextField();

        var posX:int = stage.stageWidth/4;
        var posY:int = stage.stageHeight/4;
        var r:int = 10;
        sphere= new Body(BodyType.KINEMATIC, new Vec2(posX, posY));
        sphere.shapes.add(new Circle(r, new Vec2(posX, posY), Material.rubber()));
        sphere.space = world_db;
        labels.x = 0;
        labels.y = 0;
        addChild(labels);

        var tc:test_circle = new test_circle(); 
        addChild(tc);
        tc.x = stage.stageWidth / 2;
        tc.y = stage.stageHeight / 2;

        addChild(napeDebugSprite);
        debug.drawConstraints=true;
        napeDebugSprite.addChild(debug.display);

        addEventListener(Event.ENTER_FRAME, update);
    }

    private function update(e:Event):void {
        world_db.step(1/stage.frameRate, 10, 10);
        debug.clear();
        debug.draw(world_db);
        debug.flush();
        labels.text = sphere.position.x + " - " + sphere.position.y + 
                        "\n" + stage.stageWidth + " - " + stage.stageHeight + 
                        "\n" + napeDebugSprite.width + " - " + napeDebugSprite.height + 
                        "\n" + debug.display.width + " - " + debug.display.height;
    }
}

    }

请注意:

- sphere is a Circle with radius=10 placed at StageWidth/4 and StageHeight/4;
- test_circle is a Movieclip of a circle with radius=10 placed at StageWidth/2 and StageHeight/2;

当我编译这个脚本时,我得到...... http://i.imgur.com/MAYF3j9.png?1 两个圆心居中,球体半径增加。

我做错了吗?

谢谢。

2 个答案:

答案 0 :(得分:1)

您将Body设置为具有位置(stageWidth / 4,stageHeight / 4),然后添加一个Circle形状,其局部偏移也是(stageWidth / 4,stageHeight / 4),所以当身体不是旋转圆圈将最终处于(stageWidth / 2,stageHeight / 2)。

关于图形尺寸差异,我只能假设你的图形实际上不是'半径10'而是'宽度/高度10',它是半径10圆(宽度/高度为20)的宽度/高度的一半)

答案 1 :(得分:0)

临时解决方案是扩展调试:ShapeDebug,因此代码变为......

    ....
    addChild(napeDebugSprite);
    debug.drawConstraints=true;
    //Scaling
    debug.display.scaleY = 0.5;
    debug.display.scaleX = 0.5;

    napeDebugSprite.addChild(debug.display);
    ....

这解决了问题,但这只是一种解决方法。