Java 类com.badlogic.gdx.physics.box2d.joints.RopeJoint 实例源码

private void createRope(Body bodyA, Vector2 anchorA, Body bodyB, Vector2 anchorB, float sag, AtlasRegion ropeRegion)
{
    RopeJointDef jd = new RopeJointDef();
    jd.bodyA = bodyA;
    jd.bodyB = bodyB;
    jd.localAnchorA.set(anchorA.x, anchorA.y);
    jd.localAnchorB.set(anchorB.x, anchorB.y);      
    // Max length of joint = current distance between bodies * sag
    float ropeLength =  bodyA.getWorldPoint(anchorA).sub(bodyB.getWorldPoint(anchorB)).len() * sag;
    jd.maxLength = ropeLength;

    // Create joint
    RopeJoint joint = (RopeJoint)world.createJoint(jd);
    GdxRopeJoint ropeJoint = new GdxRopeJoint(joint, jd.localAnchorA, jd.localAnchorB);

    VRope newRope = new VRope(ropeJoint, this, ropeRegion);

    ropes.add(newRope);
}

@Override
public RopeJoint getJoint(){return (RopeJoint) joint;}

private long createProperJoint(JointDef paramJointDef)
{
  if (paramJointDef.type == JointDef.JointType.DistanceJoint)
  {
    DistanceJointDef localDistanceJointDef = (DistanceJointDef)paramJointDef;
    return jniCreateDistanceJoint(this.addr, localDistanceJointDef.bodyA.addr, localDistanceJointDef.bodyB.addr, localDistanceJointDef.collideConnected, localDistanceJointDef.localAnchorA.x, localDistanceJointDef.localAnchorA.y, localDistanceJointDef.localAnchorB.x, localDistanceJointDef.localAnchorB.y, localDistanceJointDef.length, localDistanceJointDef.frequencyHz, localDistanceJointDef.dampingRatio);
  }
  if (paramJointDef.type == JointDef.JointType.FrictionJoint)
  {
    FrictionJointDef localFrictionJointDef = (FrictionJointDef)paramJointDef;
    return jniCreateFrictionJoint(this.addr, localFrictionJointDef.bodyA.addr, localFrictionJointDef.bodyB.addr, localFrictionJointDef.collideConnected, localFrictionJointDef.localAnchorA.x, localFrictionJointDef.localAnchorA.y, localFrictionJointDef.localAnchorB.x, localFrictionJointDef.localAnchorB.y, localFrictionJointDef.maxForce, localFrictionJointDef.maxTorque);
  }
  if (paramJointDef.type == JointDef.JointType.GearJoint)
  {
    GearJointDef localGearJointDef = (GearJointDef)paramJointDef;
    return jniCreateGearJoint(this.addr, localGearJointDef.bodyA.addr, localGearJointDef.bodyB.addr, localGearJointDef.collideConnected, localGearJointDef.joint1.addr, localGearJointDef.joint2.addr, localGearJointDef.ratio);
  }
  if (paramJointDef.type == JointDef.JointType.MouseJoint)
  {
    MouseJointDef localMouseJointDef = (MouseJointDef)paramJointDef;
    return jniCreateMouseJoint(this.addr, localMouseJointDef.bodyA.addr, localMouseJointDef.bodyB.addr, localMouseJointDef.collideConnected, localMouseJointDef.target.x, localMouseJointDef.target.y, localMouseJointDef.maxForce, localMouseJointDef.frequencyHz, localMouseJointDef.dampingRatio);
  }
  if (paramJointDef.type == JointDef.JointType.PrismaticJoint)
  {
    PrismaticJointDef localPrismaticJointDef = (PrismaticJointDef)paramJointDef;
    return jniCreatePrismaticJoint(this.addr, localPrismaticJointDef.bodyA.addr, localPrismaticJointDef.bodyB.addr, localPrismaticJointDef.collideConnected, localPrismaticJointDef.localAnchorA.x, localPrismaticJointDef.localAnchorA.y, localPrismaticJointDef.localAnchorB.x, localPrismaticJointDef.localAnchorB.y, localPrismaticJointDef.localAxisA.x, localPrismaticJointDef.localAxisA.y, localPrismaticJointDef.referenceAngle, localPrismaticJointDef.enableLimit, localPrismaticJointDef.lowerTranslation, localPrismaticJointDef.upperTranslation, localPrismaticJointDef.enableMotor, localPrismaticJointDef.maxMotorForce, localPrismaticJointDef.motorSpeed);
  }
  if (paramJointDef.type == JointDef.JointType.PulleyJoint)
  {
    PulleyJointDef localPulleyJointDef = (PulleyJointDef)paramJointDef;
    return jniCreatePulleyJoint(this.addr, localPulleyJointDef.bodyA.addr, localPulleyJointDef.bodyB.addr, localPulleyJointDef.collideConnected, localPulleyJointDef.groundAnchorA.x, localPulleyJointDef.groundAnchorA.y, localPulleyJointDef.groundAnchorB.x, localPulleyJointDef.groundAnchorB.y, localPulleyJointDef.localAnchorA.x, localPulleyJointDef.localAnchorA.y, localPulleyJointDef.localAnchorB.x, localPulleyJointDef.localAnchorB.y, localPulleyJointDef.lengthA, localPulleyJointDef.lengthB, localPulleyJointDef.ratio);
  }
  if (paramJointDef.type == JointDef.JointType.RevoluteJoint)
  {
    RevoluteJointDef localRevoluteJointDef = (RevoluteJointDef)paramJointDef;
    return jniCreateRevoluteJoint(this.addr, localRevoluteJointDef.bodyA.addr, localRevoluteJointDef.bodyB.addr, localRevoluteJointDef.collideConnected, localRevoluteJointDef.localAnchorA.x, localRevoluteJointDef.localAnchorA.y, localRevoluteJointDef.localAnchorB.x, localRevoluteJointDef.localAnchorB.y, localRevoluteJointDef.referenceAngle, localRevoluteJointDef.enableLimit, localRevoluteJointDef.lowerAngle, localRevoluteJointDef.upperAngle, localRevoluteJointDef.enableMotor, localRevoluteJointDef.motorSpeed, localRevoluteJointDef.maxMotorTorque);
  }
  if (paramJointDef.type == JointDef.JointType.WeldJoint)
  {
    WeldJointDef localWeldJointDef = (WeldJointDef)paramJointDef;
    return jniCreateWeldJoint(this.addr, localWeldJointDef.bodyA.addr, localWeldJointDef.bodyB.addr, localWeldJointDef.collideConnected, localWeldJointDef.localAnchorA.x, localWeldJointDef.localAnchorA.y, localWeldJointDef.localAnchorB.x, localWeldJointDef.localAnchorB.y, localWeldJointDef.referenceAngle);
  }
  if (paramJointDef.type == JointDef.JointType.RopeJoint)
  {
    RopeJointDef localRopeJointDef = (RopeJointDef)paramJointDef;
    return jniCreateRopeJoint(this.addr, localRopeJointDef.bodyA.addr, localRopeJointDef.bodyB.addr, localRopeJointDef.collideConnected, localRopeJointDef.localAnchorA.x, localRopeJointDef.localAnchorA.y, localRopeJointDef.localAnchorB.x, localRopeJointDef.localAnchorB.y, localRopeJointDef.maxLength);
  }
  if (paramJointDef.type == JointDef.JointType.WheelJoint)
  {
    WheelJointDef localWheelJointDef = (WheelJointDef)paramJointDef;
    return jniCreateWheelJoint(this.addr, localWheelJointDef.bodyA.addr, localWheelJointDef.bodyB.addr, localWheelJointDef.collideConnected, localWheelJointDef.localAnchorA.x, localWheelJointDef.localAnchorA.y, localWheelJointDef.localAnchorB.x, localWheelJointDef.localAnchorB.y, localWheelJointDef.localAxisA.x, localWheelJointDef.localAxisA.y, localWheelJointDef.enableMotor, localWheelJointDef.maxMotorTorque, localWheelJointDef.motorSpeed, localWheelJointDef.frequencyHz, localWheelJointDef.dampingRatio);
  }
  return 0L;
}

public GdxRopeJoint(RopeJoint joint, Vector2 localAnchorA , Vector2 localAnchorB) {

    this.joint = joint;
    this.localAnchorA = localAnchorA;
    this.localAnchorB = localAnchorB;

}