Java Joint类代码示例

import org.jbox2d.dynamics.joints.Joint; //导入依赖的package包/类
/**
 * 
 * Add/create shapes for all bodies/joints that have not attached shapes.<br>
 * 
 */
public void addAll(boolean create_bodies, boolean create_joints){
  
  if(create_bodies){
    for (Body body = world.getBodyList(); body != null; body = body.getNext()) {
      DwBody dwbody = DwWorld.getShape(body);
      if(dwbody == null){
        add(body);
      }
    }
  }
  
  if(create_joints){
    for (Joint joint = world.getJointList(); joint != null; joint = joint.getNext()) {
      DwJoint dwjoint = DwWorld.getShape(joint);
      if(dwjoint == null){
        add(joint);
      }
    }
  }
  
}
 

import org.jbox2d.dynamics.joints.Joint; //导入依赖的package包/类
@Override
public SerializationResult serialize(Joint argJoint, Map<Body, Integer> argBodyIndexMap,
    Map<Joint, Integer> argJointIndexMap) {
  PbJoint.Builder builder = serializeJoint(argJoint, argBodyIndexMap, argJointIndexMap);
  if (builder == null) {
    return null;
  }
  final PbJoint joint = builder.build();
  return new SerializationResult() {
    @Override
    public void writeTo(OutputStream argOutputStream) throws IOException {
      joint.writeTo(argOutputStream);
    }

    @Override
    public Object getValue() {
      return joint;
    }
  };
}
 

import org.jbox2d.dynamics.joints.Joint; //导入依赖的package包/类
private Joint setJoint(PartJoint partJoint) {
    Body bodyOne = partToBody.get(partJoint.partOne);
    Body bodyTwo = partToBody.get(partJoint.partTwo);

    RevoluteJointDef jointDef = new RevoluteJointDef();
    jointDef.bodyA = bodyOne;
    jointDef.bodyB = bodyTwo;

    jointDef.localAnchorA = partJoint.partOne.getAnchor(partJoint
            .getPercentOne());
    jointDef.localAnchorB = partJoint.partTwo.getAnchor(partJoint
            .getPercentTwo());

    jointDef.lowerAngle = Math.min(partJoint.getPointA(),
            partJoint.getPointB());
    jointDef.upperAngle = Math.max(partJoint.getPointA(),
            partJoint.getPointB());

    jointDef.maxMotorTorque = 70.0f;
    jointDef.motorSpeed = GeomUtil.circle(partJoint.getAngularVelocity());

    jointDef.enableMotor = true;
    jointDef.enableLimit = true;

    return world.createJoint(jointDef);
}
 

import org.jbox2d.dynamics.joints.Joint; //导入依赖的package包/类
public void init(TestbedModel argModel) {
	model = argModel;
	destructionListener = new DestructionListener() {

		public void sayGoodbye(Fixture fixture) {
		}

		public void sayGoodbye(Joint joint) {
			if (mouseJoint == joint) {
				mouseJoint = null;
			} else {
				jointDestroyed(joint);
			}
		}
	};

	Vec2 gravity = new Vec2(0, -10f);
	m_world = new World(gravity, true);
	bomb = null;
	mouseJoint = null;

	BodyDef bodyDef = new BodyDef();
	groundBody = m_world.createBody(bodyDef);

	init(m_world, false);
}
 

import org.jbox2d.dynamics.joints.Joint; //导入依赖的package包/类
private void drawJoint(Joint joint) {
  Body bodyA = joint.getBodyA();
  Body bodyB = joint.getBodyB();
  Transform xf1 = bodyA.getTransform();
  Transform xf2 = bodyB.getTransform();
  Vec2 x1 = xf1.p;
  Vec2 x2 = xf2.p;
  Vec2 p1 = pool.popVec2();
  Vec2 p2 = pool.popVec2();
  joint.getAnchorA(p1);
  joint.getAnchorB(p2);

  color.set(0.5f, 0.8f, 0.8f);

  switch (joint.getType()) {
  // TODO djm write after writing joints
    case DISTANCE:
      m_debugDraw.drawSegment(p1, p2, color);
      break;

    case PULLEY: {
      PulleyJoint pulley = (PulleyJoint) joint;
      Vec2 s1 = pulley.getGroundAnchorA();
      Vec2 s2 = pulley.getGroundAnchorB();
      m_debugDraw.drawSegment(s1, p1, color);
      m_debugDraw.drawSegment(s2, p2, color);
      m_debugDraw.drawSegment(s1, s2, color);
    }
      break;
    case CONSTANT_VOLUME:
    case MOUSE:
      // don't draw this
      break;
    default:
      m_debugDraw.drawSegment(x1, p1, color);
      m_debugDraw.drawSegment(p1, p2, color);
      m_debugDraw.drawSegment(x2, p2, color);
  }
  pool.pushVec2(2);
}
 

import org.jbox2d.dynamics.joints.Joint; //导入依赖的package包/类
static public void displayJoints(PGraphics pg, World world){
  pg.beginShape(PConstants.LINES);
  for (Joint joint = world.getJointList(); joint != null; joint = joint.getNext()) {
    display(pg, joint);
  }
  pg.endShape();
}
 

import org.jbox2d.dynamics.joints.Joint; //导入依赖的package包/类
/**
 * 
 * Add/create joint-shape, using the given style.<br>
 * If this joint-shape already exists it is destroyed first.<br>
 * 
 */
public DwJoint add(Joint joint, ShapeStyle style){
  if(joint == null) return null;
  DwJoint child = DwWorld.getShape(joint);
  if(child != null){
    child.release();
  }
  child = new DwJoint(this, joint);
  childrenJ.add(child);
  world.setStyle(joint, style.fill_enabled, style.fill_color, style.stroke_enabled, style.stroke_color, style.stroke_weight);
  return child;
}
 

import org.jbox2d.dynamics.joints.Joint; //导入依赖的package包/类
public DwJoint(DwBodyGroup parent, Joint joint){
    this.parent = parent;
    this.joint = joint;
    
    JointType type = joint.getType();

    // create PShape
//    this.shape = parent.papplet.createShape(PConstants.LINE, 0, 0, 1, 0);
//    this.shape.setStrokeJoin(PConstants.ROUND);
//    this.shape.setStrokeCap(PConstants.ROUND);
//    shape = parent.papplet.createShape();
//    shape.beginShape(PConstants.QUADS);
//    shape.fill(255);
//    shape.vertex(0,0);
//    shape.vertex(1,0);
//    shape.vertex(1,1);
//    shape.vertex(0,1);
//    shape.endShape();
    

    if(type == JointType.PULLEY){
      shape = parent.papplet.createShape(PConstants.GROUP);
      shape.addChild(parent.papplet.createShape(PConstants.LINE, 0, 0, 1, 0));
      shape.addChild(parent.papplet.createShape(PConstants.LINE, 0, 0, 1, 0));
      shape.addChild(parent.papplet.createShape(PConstants.LINE, 0, 0, 1, 0));
    } else {
      shape = parent.papplet.createShape(PConstants.LINE, 0, 0, 1, 0);
    }
    
    
    
    // link PShapes
    parent.shape.addChild(shape);
    
    joint.setUserData(this);
  }
 

import org.jbox2d.dynamics.joints.Joint; //导入依赖的package包/类
public void updateJoints(){
    Vec2 ancA = new Vec2();
    Vec2 ancB = new Vec2();
 
    for (Joint joint = super.getJointList(); joint != null; joint = joint.getNext()) {
      
      DwJoint dwjoint = getShape(joint);
      if(dwjoint != null){
        PShape shape = dwjoint.shape;
        
        JointType type = joint.getType();
        
        joint.getAnchorA(ancA);
        joint.getAnchorB(ancB);
        
//        Body bodyA = joint.getBodyA();
//        Body bodyB = joint.getBodyB();
//        Transform xfA = bodyA.getTransform();
//        Transform xfB = bodyB.getTransform();
//        Vec2 posA = xfA.p;
//        Vec2 posB = xfB.p;
        
        if(type == JointType.PULLEY){
          PulleyJoint pulley = (PulleyJoint) joint;
          Vec2 gancA = pulley.getGroundAnchorA();
          Vec2 gancB = pulley.getGroundAnchorB();

          updateLineShape(shape.getChild(0), ancA, gancA);
          updateLineShape(shape.getChild(1), ancB, gancB);
          updateLineShape(shape.getChild(2), gancA, gancB);
        } else {
          updateLineShape(shape, ancA, ancB);
        }
      }
      
    }

  }
 

import org.jbox2d.dynamics.joints.Joint; //导入依赖的package包/类
public PShape setStyle(Joint joint
    , boolean fill_enabled
    , int     fill_color
    , boolean stroke_enabled
    , int     stroke_color
    , float   stroke_weight
){
  DwJoint dwjoint = getShape(joint);
  return setStyle(dwjoint.shape, fill_enabled, fill_color, stroke_enabled, stroke_color, stroke_weight);
}
 

import org.jbox2d.dynamics.joints.Joint; //导入依赖的package包/类
public void init(int bodyCapacity, int contactCapacity, int jointCapacity, ContactListener listener){
	m_bodyCapacity = bodyCapacity;
	m_contactCapacity = contactCapacity;
	m_jointCapacity = jointCapacity;
	m_bodyCount = 0;
	m_contactCount = 0;
	m_jointCount = 0;
	
	m_listener = listener;
	
	if(m_bodies == null || m_bodyCapacity > m_bodies.length){
		m_bodies = new Body[m_bodyCapacity];
	}
	if(m_joints == null || m_jointCapacity > m_joints.length){
		m_joints = new Joint[m_jointCapacity];			
	}
	if(m_contacts == null || m_contactCapacity > m_contacts.length){
		m_contacts = new Contact[m_contactCapacity];
	}
	
	// could do some copy stuff, but just a full creation for now
	// TODO djm do a copy
	if(m_velocities == null || m_bodyCapacity > m_velocities.length){
		m_velocities = new Velocity[m_bodyCapacity];
		for(int i=0; i<m_velocities.length; i++){
			m_velocities[i] = new Velocity();
		}
	}
	
	// could do some copy stuff, but just a full creation for now
	// TODO djm do a copy
	if(m_positions == null || m_bodyCapacity > m_positions.length){
		m_positions = new Position[m_bodyCapacity];
		for(int i=0; i<m_positions.length; i++){
			m_positions[i] = new Position();
		}
	}
}
 

import org.jbox2d.dynamics.joints.Joint; //导入依赖的package包/类
private void drawJoint(Joint joint) {
	Body bodyA = joint.getBodyA();
	Body bodyB = joint.getBodyB();
	Transform xf1 = bodyA.getTransform();
	Transform xf2 = bodyB.getTransform();
	Vec2 x1 = xf1.position;
	Vec2 x2 = xf2.position;
	Vec2 p1 = pool.popVec2();
	Vec2 p2 = pool.popVec2();
	joint.getAnchorA(p1);
	joint.getAnchorB(p2);
	
	color.set(0.5f, 0.8f, 0.8f);
	
	switch (joint.getType()) {
		// TODO djm write after writing joints
		case DISTANCE :
			m_debugDraw.drawSegment(p1, p2, color);
			break;
		
		case PULLEY : {
			PulleyJoint pulley = (PulleyJoint) joint;
			Vec2 s1 = pulley.getGroundAnchorA();
			Vec2 s2 = pulley.getGroundAnchorB();
			m_debugDraw.drawSegment(s1, p1, color);
			m_debugDraw.drawSegment(s2, p2, color);
			m_debugDraw.drawSegment(s1, s2, color);
		}
			break;
		case CONSTANT_VOLUME :
		case MOUSE :
			// don't draw this
			break;
		default :
			m_debugDraw.drawSegment(x1, p1, color);
			m_debugDraw.drawSegment(p1, p2, color);
			m_debugDraw.drawSegment(x2, p2, color);
	}
	pool.pushVec2(2);
}
 

import org.jbox2d.dynamics.joints.Joint; //导入依赖的package包/类
public void jointDestroyed(Joint joint) {
	for (int i = 0; i < 8; ++i) {
		if (m_joints[i] == joint) {
			m_joints[i] = null;
			break;
		}
	}
}
 

import org.jbox2d.dynamics.joints.Joint; //导入依赖的package包/类
private void drawJoint(Joint joint) {
  Body bodyA = joint.getBodyA();
  Body bodyB = joint.getBodyB();
  Transform xf1 = bodyA.getTransform();
  Transform xf2 = bodyB.getTransform();
  Vector2 x1 = xf1.p;
  Vector2 x2 = xf2.p;
  Vector2 p1 = pool.popVec2();
  Vector2 p2 = pool.popVec2();
  joint.getAnchorA(p1);
  joint.getAnchorB(p2);

  color.set(0.5f, 0.8f, 0.8f);

  switch (joint.getType()) {
  // TODO djm write after writing joints
    case DISTANCE:
      m_debugDraw.drawSegment(p1, p2, color);
      break;

    case PULLEY: {
      PulleyJoint pulley = (PulleyJoint) joint;
      Vector2 s1 = pulley.getGroundAnchorA();
      Vector2 s2 = pulley.getGroundAnchorB();
      m_debugDraw.drawSegment(s1, p1, color);
      m_debugDraw.drawSegment(s2, p2, color);
      m_debugDraw.drawSegment(s1, s2, color);
    }
      break;
    case CONSTANT_VOLUME:
    case MOUSE:
      // don't draw this
      break;
    default:
      m_debugDraw.drawSegment(x1, p1, color);
      m_debugDraw.drawSegment(p1, p2, color);
      m_debugDraw.drawSegment(x2, p2, color);
  }
  pool.pushVec2(2);
}
 

import org.jbox2d.dynamics.joints.Joint; //导入依赖的package包/类
public void init(int bodyCapacity, int contactCapacity, int jointCapacity, ContactListener listener){
	m_bodyCapacity = bodyCapacity;
	m_contactCapacity = contactCapacity;
	m_jointCapacity = jointCapacity;
	m_bodyCount = 0;
	m_contactCount = 0;
	m_jointCount = 0;
	
	m_listener = listener;
	
	if(m_bodies == null || m_bodyCapacity >= m_bodies.length){
		m_bodies = new Body[m_bodyCapacity];
	}
	if(m_joints == null || m_jointCapacity > m_joints.length){
		m_joints = new Joint[m_jointCapacity];			
	}
	if(m_contacts == null || m_contactCapacity > m_contacts.length){
		m_contacts = new Contact[m_contactCapacity];
	}
	
	// could do some copy stuff, but just a full creation for now
	// TODO djm do a copy
	if(m_velocities == null || m_bodyCapacity > m_velocities.length){
		m_velocities = new Velocity[m_bodyCapacity];
		for(int i=0; i<m_velocities.length; i++){
			m_velocities[i] = new Velocity();
		}
	}
	
	// could do some copy stuff, but just a full creation for now
	// TODO djm do a copy
	if(m_positions == null || m_bodyCapacity > m_positions.length){
		m_positions = new Position[m_bodyCapacity];
		for(int i=0; i<m_positions.length; i++){
			m_positions[i] = new Position();
		}
	}
}