Examples of RevoluteJointDef

com.badlogic.gdx.physics.box2d.joints.RevoluteJointDef
Revolute joint definition. This requires defining an anchor point where the bodies are joined. The definition uses local anchor points so that the initial configuration can violate the constraint slightly. You also need to specify the initial relative angle for joint limits. This helps when saving and loading a game. The local anchor points are measured from the body's origin rather than the center of mass because: 1. you might not know where the center of mass will be. 2. if you add/remove shapes from a body and recompute the mass, the joints will be broken.
org.jbox2d.dynamics.joints.RevoluteJointDef
Revolute joint definition. This requires defining an anchor point where the bodies are joined. The definition uses local anchor points so that the initial configuration can violate the constraint slightly. You also need to specify the initial relative angle for joint limits. This helps when saving and loading a game. The local anchor points are measured from the body's origin rather than the center of mass because:
- you might not know where the center of mass will be.
- if you add/remove shapes from a body and recompute the mass, the joints will be broken.

Examples of org.jbox2d.dynamics.joints.RevoluteJointDef

      bd3.type = BodyType.DYNAMIC;
      bd3.position.set(10.0f, 6.0f);
      Body body3 = m_world.createBody(bd3);
      body3.createFixture(circle2, 5.0f);


      RevoluteJointDef jd1 = new RevoluteJointDef();
      jd1.initialize(body2, body1, bd1.position);
      Joint joint1 = m_world.createJoint(jd1);


      RevoluteJointDef jd2 = new RevoluteJointDef();
      jd2.initialize(body2, body3, bd3.position);
      Joint joint2 = m_world.createJoint(jd2);


      GearJointDef jd4 = new GearJointDef();
      jd4.bodyA = body1;
      jd4.bodyB = body3;
      jd4.joint1 = joint1;
      jd4.joint2 = joint2;
      jd4.ratio = circle2.m_radius / circle1.m_radius;
      m_world.createJoint(jd4);
    }


    {
      CircleShape circle1 = new CircleShape();
      circle1.m_radius = 1.0f;


      CircleShape circle2 = new CircleShape();
      circle2.m_radius = 2.0f;


      PolygonShape box = new PolygonShape();
      box.setAsBox(0.5f, 5.0f);


      BodyDef bd1 = new BodyDef();
      bd1.type = BodyType.DYNAMIC;
      bd1.position.set(-3.0f, 12.0f);
      Body body1 = m_world.createBody(bd1);
      body1.createFixture(circle1, 5.0f);


      RevoluteJointDef jd1 = new RevoluteJointDef();
      jd1.bodyA = ground;
      jd1.bodyB = body1;
      ground.getLocalPointToOut(bd1.position, jd1.localAnchorA);
      body1.getLocalPointToOut(bd1.position, jd1.localAnchorB);
      jd1.referenceAngle = body1.getAngle() - ground.getAngle();
      m_joint1 = (RevoluteJoint) m_world.createJoint(jd1);


      BodyDef bd2 = new BodyDef();
      bd2.type = BodyType.DYNAMIC;
      bd2.position.set(0.0f, 12.0f);
      Body body2 = m_world.createBody(bd2);
      body2.createFixture(circle2, 5.0f);


      RevoluteJointDef jd2 = new RevoluteJointDef();
      jd2.initialize(ground, body2, bd2.position);
      m_joint2 = (RevoluteJoint) m_world.createJoint(jd2);


      BodyDef bd3 = new BodyDef();
      bd3.type = BodyType.DYNAMIC;
      bd3.position.set(2.5f, 12.0f);

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Examples of org.jbox2d.dynamics.joints.RevoluteJointDef

      fd.density = 20.0f;
      fd.friction = 0.2f;
      fd.filter.categoryBits = 0x0001;
      fd.filter.maskBits = 0xFFFF & ~0x0002;


      RevoluteJointDef jd = new RevoluteJointDef();
      jd.collideConnected = false;


      final int N = 10;
      final float y = 15.0f;
      m_ropeDef = new RopeJointDef();
      m_ropeDef.localAnchorA.set(0.0f, y);


      Body prevBody = ground;
      for (int i = 0; i < N; ++i) {
        BodyDef bd = new BodyDef();
        bd.type = BodyType.DYNAMIC;
        bd.position.set(0.5f + 1.0f * i, y);
        if (i == N - 1) {
          shape.setAsBox(1.5f, 1.5f);
          fd.density = 100.0f;
          fd.filter.categoryBits = 0x0002;
          bd.position.set(1.0f * i, y);
          bd.angularDamping = 0.4f;
        }


        Body body = getWorld().createBody(bd);


        body.createFixture(fd);


        Vec2 anchor = new Vec2(i, y);
        jd.initialize(prevBody, body, anchor);
        getWorld().createJoint(jd);


        prevBody = body;
      }

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Examples of org.jbox2d.dynamics.joints.RevoluteJointDef

      shape.setAsBox(10.0f, 0.5f, new Vec2(0.0f, 10.0f), 0.0f);
      body.createFixture(shape, 5.0f);
      shape.setAsBox(10.0f, 0.5f, new Vec2(0.0f, -10.0f), 0.0f);
      body.createFixture(shape, 5.0f);


      RevoluteJointDef jd = new RevoluteJointDef();
      jd.bodyA = getGroundBody();
      jd.bodyB = body;
      jd.localAnchorA.set(0.0f, 10.0f);
      jd.localAnchorB.set(0.0f, 0.0f);
      jd.referenceAngle = 0.0f;

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