Java RevoluteJoint类代码示例

import org.jbox2d.dynamics.joints.RevoluteJoint; //导入依赖的package包/类
public RevoluteJoint bind(IPhysicsBody other, Vector2f anchor, Float maxForce) {
	if( !boundBodies.containsKey(other) ) {
		final Box2dPhysicsBody otherBody = (Box2dPhysicsBody) other;
		
		RevoluteJoint joint = parent.createRevoluteJoint(body, otherBody.getBody(), new Vec2(anchor.x*BOX2D_SCALE_FACTOR, anchor.y*BOX2D_SCALE_FACTOR), maxForce);
		
		if( joint==null )
			return null;
		
		boundBodies.put(other, joint);
		otherBody.boundBodies.put(other, joint);
		
		return joint;
	}
	
	return null;
}
 

import org.jbox2d.dynamics.joints.RevoluteJoint; //导入依赖的package包/类
@Override
public void processJoint(Joint joint, Long tag) {
  if (tag == JOINT_TAG) {
    m_joint = (RevoluteJoint) joint;
    isLeft = m_joint.getMotorSpeed() > 0;
  } else {
    super.processJoint(joint, tag);
  }
}
 

import org.jbox2d.dynamics.joints.RevoluteJoint; //导入依赖的package包/类
@Override
public void initTest(boolean deserialized) {
  {
    BodyDef bd = new BodyDef();
    bd.type = BodyType.DYNAMIC;
    bd.allowSleep = false;
    bd.position.set(0.0f, 10.0f);
    Body body = m_world.createBody(bd);

    PolygonShape shape = new PolygonShape();
    shape.setAsBox(0.5f, 10.0f, new Vec2(10.0f, 0.0f), 0.0f);
    body.createFixture(shape, 5.0f);
    shape.setAsBox(0.5f, 10.0f, new Vec2(-10.0f, 0.0f), 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);
    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;
    jd.motorSpeed = 0.05f * MathUtils.PI;
    jd.maxMotorTorque = 1e8f;
    jd.enableMotor = true;
    m_joint = (RevoluteJoint) m_world.createJoint(jd);
  }
  m_count = 0;
}
 

import org.jbox2d.dynamics.joints.RevoluteJoint; //导入依赖的package包/类
@Override
public void processJoint(Joint argJoint, Long argTag) {
  if (argTag == MOTOR_TAG) {
    m_motorJoint = (RevoluteJoint) argJoint;
    m_motorOn = m_motorJoint.isMotorEnabled();
  }
}
 

import org.jbox2d.dynamics.joints.RevoluteJoint; //导入依赖的package包/类
/**
 * Advances the simulation.
 */
public synchronized void update() {
    world.step(timeStep, velocityIterations, positionIterations);

    for (RevoluteJoint joint = (RevoluteJoint) world.getJointList(); joint != null; joint = (RevoluteJoint) joint
            .getNext()) {
        if (joint.getJointAngle() <= joint.getLowerLimit()
                || joint.getJointAngle() >= joint.getUpperLimit()) {
            joint.setMotorSpeed((float) (-joint.getMotorSpeed()));
        }
    }
}
 

import org.jbox2d.dynamics.joints.RevoluteJoint; //导入依赖的package包/类
@Override
public void processJoint(Joint argJoint, Long argTag) {
  if(argTag == MOTOR_TAG){
    m_motorJoint = (RevoluteJoint) argJoint;
    m_motorOn = m_motorJoint.m_enableMotor;
  }
}
 

import org.jbox2d.dynamics.joints.RevoluteJoint; //导入依赖的package包/类
public RevoluteJoint createRevoluteJoint(Body body1, Body body2, Vec2 anchor, Float maxMotorTorque) {
	RevoluteJointDef jointDef = new RevoluteJointDef();
	jointDef.initialize(body1, body2, anchor);
	
	if( maxMotorTorque!=null ) {
		jointDef.maxMotorTorque = maxMotorTorque;
		jointDef.enableMotor = true;
		jointDef.motorSpeed = 1f;
	}
	
	return (RevoluteJoint) physicsWorld.createJoint(jointDef);
}
 

import org.jbox2d.dynamics.joints.RevoluteJoint; //导入依赖的package包/类
public void initScene() {
    

    {
      BodyDef bd = new BodyDef();
      Body groundbody = world.createBody(bd);
      
      bd.type = BodyType.DYNAMIC;
      bd.allowSleep = false;
      bd.position.set(0.0f, 0.0f);
      Body body = world.createBody(bd);

      PolygonShape shape = new PolygonShape();
      shape.setAsBox(1, 11.0f, new Vec2(10.0f, 0.0f), 0.0f);
      body.createFixture(shape, 15.0f);
      shape.setAsBox(1, 11.0f, new Vec2(-10.0f, 0.0f), 0.0f);
      body.createFixture(shape, 15.0f);
      shape.setAsBox(11.0f, 1, new Vec2(0.0f, 10.0f), 0.0f);
      body.createFixture(shape, 15.0f);
      shape.setAsBox(11.0f, 1, new Vec2(0.0f, -10.0f), 0.0f);
      body.createFixture(shape, 15.0f);

      
      CircleShape obstacle = new CircleShape(); 
      obstacle.m_radius = 1; 
      obstacle.m_p.set(-2, -6.5f);
      body.createFixture(obstacle, 115.0f);
      obstacle.m_p.set(2, +6.5f);
      body.createFixture(obstacle, 115.0f);
//      obstacle.m_p.set(-7.5f, 0);
//      body.createFixture(obstacle, 15.0f);
//      obstacle.m_p.set(+7.5f, 0);
//      body.createFixture(obstacle, 15.0f);


      world.bodies.add(body, true, color(224), true, color(0), 1f);

      RevoluteJointDef jd = new RevoluteJointDef();
      jd.bodyA = groundbody;
      jd.bodyB = body;
      jd.localAnchorA.set(0.0f, 0.0f);
      jd.localAnchorB.set(0.0f, 0.0f);
      jd.referenceAngle = 0.0f;
      jd.motorSpeed = 0.1f * MathUtils.PI;
      jd.maxMotorTorque = 1e7f;
      jd.enableMotor = true;
      m_joint = (RevoluteJoint) world.createJoint(jd);
    }
    m_count = 0;
   

    // creates shapes for all rigid bodies in the world.
    world.bodies.addAll();
  }
 

import org.jbox2d.dynamics.joints.RevoluteJoint; //导入依赖的package包/类
/**
 * @see org.jbox2d.testbed.framework.TestbedTest#initTest()
 */
@Override
public void initTest() {
	Body ground = null;
	{
		BodyDef bd = new BodyDef();
		ground = m_world.createBody(bd);

		PolygonShape shape = new PolygonShape();
		shape.setAsEdge(new Vec2(50.0f, 0.0f), new Vec2(-50.0f, 0.0f));
		ground.createFixture(shape, 0.0f);
	}

	{
		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;
		jd1.localAnchorA = ground.getLocalPoint(bd1.position);
		jd1.localAnchorB = body1.getLocalPoint(bd1.position);
		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);
		Body body3 = m_world.createBody(bd3);
		body3.createFixture(box, 5.0f);

		PrismaticJointDef jd3 = new PrismaticJointDef();
		jd3.initialize(ground, body3, bd3.position, new Vec2(0.0f, 1.0f));
		jd3.lowerTranslation = -5.0f;
		jd3.upperTranslation = 5.0f;
		jd3.enableLimit = true;

		m_joint3 = (PrismaticJoint)m_world.createJoint(jd3);

		GearJointDef jd4 = new GearJointDef();
		jd4.bodyA = body1;
		jd4.bodyB = body2;
		jd4.joint1 = m_joint1;
		jd4.joint2 = m_joint2;
		jd4.ratio = circle2.m_radius / circle1.m_radius;
		m_joint4 = (GearJoint)m_world.createJoint(jd4);

		GearJointDef jd5 = new GearJointDef();
		jd5.bodyA = body2;
		jd5.bodyB = body3;
		jd5.joint1 = m_joint2;
		jd5.joint2 = m_joint3;
		jd5.ratio = -1.0f / circle2.m_radius;
		m_joint5 = (GearJoint)m_world.createJoint(jd5);
	}
}
 

import org.jbox2d.dynamics.joints.RevoluteJoint; //导入依赖的package包/类
@Override
public void init(GameContainer container, StateBasedGame game) throws SlickException {
	float boxWidth = 0.4f;
	float boxHeight = 6.0f;
	Vec2 jointPos = new Vec2(this.position.x, this.position.y + boxHeight);
	
	//==Pivot============
	BodyDef pivotDef = new BodyDef();
	pivotDef.position.set(jointPos);
	Body pivot = this.world.createBody(pivotDef);
	
	CircleDef cd = new CircleDef();
	cd.radius = boxWidth * 0.5f;
	cd.density = 0;	

	pivot.createShape(cd);
	pivot.setMassFromShapes();
	
	//==P�ndulo==========
	BodyDef boxDef = new BodyDef();
	boxDef.position.set(this.position);
	Body box = this.world.createBody(boxDef);
	
	PolygonDef sd = new PolygonDef();
	sd.setAsBox(boxWidth, boxHeight);
	MassData data = new MassData(0.1f, 1.0f, 0.1f);
	data.setObjectMass(sd);
	sd.userData = data;

	box.createShape(sd);
	box.setMassFromShapes();
	box.setUserData(this);
	
	//==Revolute Joint===
	RevoluteJointDef rd = new RevoluteJointDef();
	rd.initialize(pivot, box, jointPos);
	rd.enableMotor = true;
	rd.motorSpeed = -MOTOR_SPEED;
	rd.maxMotorTorque = MOTOR_TORQUE;
	rd.enableLimit = true;
	rd.upperAngle = (float) (MAX_ANGLE * (Math.PI / 180));
	rd.lowerAngle = (float) (-MAX_ANGLE * (Math.PI / 180));
	this.objBody = (RevoluteJoint) this.world.createJoint(rd);
	this.objBody.m_body1.setAngularDamping(-0.3f);
	
	//Obt�m o objeto de som.
	this.sfx = SoundPlayer.playObjPendulumImpulse();
}
 

import org.jbox2d.dynamics.joints.RevoluteJoint; //导入依赖的package包/类
@Override
public void init(GameContainer container, StateBasedGame game) throws SlickException {
	this.motorSpeed = Utils.getRandomNumber(MAX_MOTOR_SPEED);
	if (this.motorSpeed < MIN_MOTOR_SPEED) this.motorSpeed = MIN_MOTOR_SPEED;		
	
	//==Pivot============
	BodyDef pivotDef = new BodyDef();
	pivotDef.position.set(this.position);
	Body pivot = this.world.createBody(pivotDef);
	
	CircleDef cd = new CircleDef();
	cd.radius = RADIUS * 0.1f;
	cd.density = 0;	

	pivot.createShape(cd);
	pivot.setMassFromShapes();
	
	//==Rotator==========
	
	BodyDef rotDef = new BodyDef();
	rotDef.position.set(this.position);
	Body rotator = this.world.createBody(rotDef);
	
	//Massa do objeto.
	MassData data = new MassData(0.1f, 1.0f, 0.1f);
	
	//C�rculo da �rea que causa morte.
	CircleDef crd = new CircleDef();
	crd.radius = RADIUS;
	data.setObjectMass(crd);
	crd.userData = data;
	rotator.createShape(crd);
	
	//Ret�ngulo da �rea que se pode parar sem morrer.
	PolygonDef sd = new PolygonDef();
	sd.setAsBox(1.0f, 0.15f, new Vec2(0, 2.37f), 0);
	sd.userData = false; //Indica que n�o causa morte.
	rotator.createShape(sd);
	
	rotator.setMassFromShapes();
	rotator.setUserData(this);
	
	//==Revolute Joint===
	RevoluteJointDef rd = new RevoluteJointDef();
	rd.initialize(pivot, rotator, this.position);
	rd.enableMotor = true;
	rd.motorSpeed = (Utils.getRandomNumber(2) == 1 ? 1 : -1) * this.motorSpeed;
	rd.maxMotorTorque = MOTOR_TORQUE;
	this.objBody = (RevoluteJoint) this.world.createJoint(rd);
	
	//Define a tonalidade do som.
	this.pitch = rd.motorSpeed / MAX_MOTOR_SPEED;

	//Obt�m o objeto de som.
	this.sfx = SoundPlayer.playObjRotatorMotor();
}
 

import org.jbox2d.dynamics.joints.RevoluteJoint; //导入依赖的package包/类
@Override
public void processJoint(Joint argJoint, Long argTag) {
  if (argTag == JOINT_TAG) {
    joint = (RevoluteJoint) argJoint;
  }
}
 

import org.jbox2d.dynamics.joints.RevoluteJoint; //导入依赖的package包/类
/**
 * @see org.jbox2d.testbed.framework.TestbedTest#initTest(boolean)
 */
@Override
public void initTest(boolean argDeserialized) {
	Body ground = null;
	{
		BodyDef bd = new BodyDef();
		ground = getWorld().createBody(bd);

		PolygonShape shape = new PolygonShape();
		shape.setAsEdge(new Vec2(50.0f, 0.0f), new Vec2(-50.0f, 0.0f));
		ground.createFixture(shape, 0.0f);
	}

	{
		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 = getWorld().createBody(bd1);
		body1.createFixture(circle1, 5.0f);

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

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

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

		BodyDef bd3 = new BodyDef();
		bd3.type = BodyType.DYNAMIC;
		bd3.position.set(2.5f, 12.0f);
		Body body3 = getWorld().createBody(bd3);
		body3.createFixture(box, 5.0f);

		PrismaticJointDef jd3 = new PrismaticJointDef();
		jd3.initialize(ground, body3, bd3.position, new Vec2(0.0f, 1.0f));
		jd3.lowerTranslation = -5.0f;
		jd3.upperTranslation = 5.0f;
		jd3.enableLimit = true;

		m_joint3 = (PrismaticJoint)getWorld().createJoint(jd3);

		GearJointDef jd4 = new GearJointDef();
		jd4.bodyA = body1;
		jd4.bodyB = body2;
		jd4.joint1 = m_joint1;
		jd4.joint2 = m_joint2;
		jd4.ratio = circle2.m_radius / circle1.m_radius;
		m_joint4 = (GearJoint)getWorld().createJoint(jd4);

		GearJointDef jd5 = new GearJointDef();
		jd5.bodyA = body2;
		jd5.bodyB = body3;
		jd5.joint1 = m_joint2;
		jd5.joint2 = m_joint3;
		jd5.ratio = -1.0f / circle2.m_radius;
		m_joint5 = (GearJoint)getWorld().createJoint(jd5);
	}
}