libGDX：掛繩一些樞結

Question

我試圖製造具有它在libGDX低端一些對象掛繩， 繩應該像hanging rope in Box2D

我已經做了很多的研究，libGDX有其ropeJoint方法，但如何使用它來製作繩子？

請幫忙，這將是一個很大的忙。

Answer 1

我已經開始與回答類似的問題 libGDX: Hanging Rope

，並添加一些代碼給它添加一些缺碼和修復錨一些問題，我認爲下面的代碼是一個合適的目標問題：

BodyDef ropeStartDef = new BodyDef(); 
    int EACH_RING_DISTANCE = 10 
    ropeStartDef.type = BodyType.StaticBody; 
    ropeStartDef.position.set(m_camera.viewportWidth/2,m_camera.viewportHeight); 
    Body ropStartBody = m_world.createBody(ropeStartDef); 
    PolygonShape ropeStartShape = new PolygonShape(); 
    ropeStartShape.setAsBox(5, 5); 
    ropStartBody.createFixture(ropeStartShape, 0); 
    ropeStartShape.dispose(); 
    //---------------------------- 
    RevoluteJointDef jd = new RevoluteJointDef(); 
    Body prevBody = ropStartBody; 
    int angle = -90; 
    Vector2 position = ropeStartDef.position; 
    BodyDef previousbodyDefinition= ropeStartDef; 
    for(int i=0; i<5; i++) 
     { 
      BodyDef bd = new BodyDef(); 
      bd.type = BodyType.DynamicBody; 
      bd.angle = angle-MathUtils.PI/2; 
      bd.position.set(position.x + i*MathUtils.cos(angle)*EACH_RING_DISTANCE, 
          position.y + i*MathUtils.sin(angle)*EACH_RING_DISTANCE); 
      Body body = m_world.createBody(bd); 
      FixtureDef eachRingFD; 
      eachRingFD = new FixtureDef(); 
      CircleShape chainCircleshape =new CircleShape(); 
      chainCircleshape.setRadius(4); 
      eachRingFD.density = 2; 
      eachRingFD.shape =chainCircleshape; 
      body.createFixture(eachRingFD); 

      Vector2 anchor = new Vector2(bd.position.x - MathUtils.cos(angle)*EACH_RING_DISTANCE/2f, 
             bd.position.y - MathUtils.sin(angle)*EACH_RING_DISTANCE/2f); 
      jd.initialize(prevBody, body, anchor); 
      //-----------------------added based on http://www.emanueleferonato.com/2009/10/05/basic-box2d-rope/ 
       RevoluteJointDef joint = new RevoluteJointDef(); 
       joint.initialize(prevBody, body, anchor); 
       m_world.createJoint(joint); 

      //------------------------end of added 
      prevBody = body; 
      previousbodyDefinition = bd; 
     }