Пример #1
0
        //--------------- Internals Below -------------------

        /** @private */
        public b2GearJoint(b2GearJointDef def) : base(def)
        {
            int type1 = def.joint1.m_type;
            int type2 = def.joint2.m_type;

            //b2Settings.b2Assert(type1 == b2Joint.e_revoluteJoint || type1 == b2Joint.e_prismaticJoint);
            //b2Settings.b2Assert(type2 == b2Joint.e_revoluteJoint || type2 == b2Joint.e_prismaticJoint);
            //b2Settings.b2Assert(def.joint1.GetBodyA().GetType() == b2Body.b2_staticBody);
            //b2Settings.b2Assert(def.joint2.GetBodyA().GetType() == b2Body.b2_staticBody);

            m_revolute1  = null;
            m_prismatic1 = null;
            m_revolute2  = null;
            m_prismatic2 = null;

            float coordinate1;
            float coordinate2;

            m_ground1 = def.joint1.GetBodyA();
            m_bodyA   = def.joint1.GetBodyB();
            if (type1 == b2Joint.e_revoluteJoint)
            {
                m_revolute1 = def.joint1 as b2RevoluteJoint;
                m_groundAnchor1.SetV(m_revolute1.m_localAnchor1);
                m_localAnchor1.SetV(m_revolute1.m_localAnchor2);
                coordinate1 = m_revolute1.GetJointAngle();
            }
            else
            {
                m_prismatic1 = def.joint1 as b2PrismaticJoint;
                m_groundAnchor1.SetV(m_prismatic1.m_localAnchor1);
                m_localAnchor1.SetV(m_prismatic1.m_localAnchor2);
                coordinate1 = m_prismatic1.GetJointTranslation();
            }

            m_ground2 = def.joint2.GetBodyA();
            m_bodyB   = def.joint2.GetBodyB();
            if (type2 == b2Joint.e_revoluteJoint)
            {
                m_revolute2 = def.joint2 as b2RevoluteJoint;
                m_groundAnchor2.SetV(m_revolute2.m_localAnchor1);
                m_localAnchor2.SetV(m_revolute2.m_localAnchor2);
                coordinate2 = m_revolute2.GetJointAngle();
            }
            else
            {
                m_prismatic2 = def.joint2 as b2PrismaticJoint;
                m_groundAnchor2.SetV(m_prismatic2.m_localAnchor1);
                m_localAnchor2.SetV(m_prismatic2.m_localAnchor2);
                coordinate2 = m_prismatic2.GetJointTranslation();
            }

            m_ratio = def.ratio;

            m_constant = coordinate1 + m_ratio * coordinate2;

            m_impulse = 0.0f;
        }
Пример #2
0
        public b2GearJoint(b2GearJointDef def)
            : base(def)
        {
            m_joint1 = def.joint1;
            m_joint2 = def.joint2;

            m_typeA = m_joint1.GetJointType();
            m_typeB = m_joint2.GetJointType();

            Debug.Assert(m_typeA == b2JointType.e_revoluteJoint || m_typeA == b2JointType.e_prismaticJoint);
            Debug.Assert(m_typeB == b2JointType.e_revoluteJoint || m_typeB == b2JointType.e_prismaticJoint);

            float coordinateA, coordinateB;

            // TODO_ERIN there might be some problem with the joint edges in b2Joint.

            m_bodyC = m_joint1.GetBodyA();
            m_bodyA = m_joint1.GetBodyB();

            // Get geometry of joint1
            b2Transform xfA = m_bodyA.XF;
            float       aA  = m_bodyA.Sweep.a;
            b2Transform xfC = m_bodyC.XF;
            float       aC  = m_bodyC.Sweep.a;

            if (m_typeA == b2JointType.e_revoluteJoint)
            {
                b2RevoluteJoint revolute = (b2RevoluteJoint)def.joint1;
                m_localAnchorC    = revolute.GetLocalAnchorA();
                m_localAnchorA    = revolute.GetLocalAnchorB();
                m_referenceAngleA = revolute.GetReferenceAngle();
                m_localAxisC.SetZero();

                coordinateA = aA - aC - m_referenceAngleA;
            }
            else
            {
                b2PrismaticJoint prismatic = (b2PrismaticJoint)def.joint1;
                m_localAnchorC    = prismatic.GetLocalAnchorA();
                m_localAnchorA    = prismatic.GetLocalAnchorB();
                m_referenceAngleA = prismatic.GetReferenceAngle();
                m_localAxisC      = prismatic.GetLocalXAxisA();

                b2Vec2 pC = m_localAnchorC;
                b2Vec2 pA = b2Math.b2MulT(xfC.q, b2Math.b2Mul(xfA.q, m_localAnchorA) + (xfA.p - xfC.p));
                coordinateA = b2Math.b2Dot(pA - pC, m_localAxisC);
            }

            m_bodyD = m_joint2.GetBodyA();
            m_bodyB = m_joint2.GetBodyB();

            // Get geometry of joint2
            b2Transform xfB = m_bodyB.XF;
            float       aB  = m_bodyB.Sweep.a;
            b2Transform xfD = m_bodyD.XF;
            float       aD  = m_bodyD.Sweep.a;

            if (m_typeB == b2JointType.e_revoluteJoint)
            {
                b2RevoluteJoint revolute = (b2RevoluteJoint)def.joint2;
                m_localAnchorD    = revolute.GetLocalAnchorA();
                m_localAnchorB    = revolute.GetLocalAnchorB();
                m_referenceAngleB = revolute.GetReferenceAngle();
                m_localAxisD.SetZero();

                coordinateB = aB - aD - m_referenceAngleB;
            }
            else
            {
                b2PrismaticJoint prismatic = (b2PrismaticJoint)def.joint2;
                m_localAnchorD    = prismatic.GetLocalAnchorA();
                m_localAnchorB    = prismatic.GetLocalAnchorB();
                m_referenceAngleB = prismatic.GetReferenceAngle();
                m_localAxisD      = prismatic.GetLocalXAxisA();

                b2Vec2 pD = m_localAnchorD;
                b2Vec2 pB = b2Math.b2MulT(xfD.q, b2Math.b2Mul(xfB.q, m_localAnchorB) + (xfB.p - xfD.p));
                coordinateB = b2Math.b2Dot(pB - pD, m_localAxisD);
            }

            m_ratio = def.ratio;

            m_constant = coordinateA + m_ratio * coordinateB;

            m_impulse = 0.0f;
        }
Пример #3
0
        public b2GearJoint(b2GearJointDef def)
            : base(def)
        {
            m_joint1 = def.joint1;
            m_joint2 = def.joint2;

            m_typeA = m_joint1.GetJointType();
            m_typeB = m_joint2.GetJointType();

            Debug.Assert(m_typeA == b2JointType.e_revoluteJoint || m_typeA == b2JointType.e_prismaticJoint);
            Debug.Assert(m_typeB == b2JointType.e_revoluteJoint || m_typeB == b2JointType.e_prismaticJoint);

            float coordinateA, coordinateB;

            // TODO_ERIN there might be some problem with the joint edges in b2Joint.

            m_bodyC = m_joint1.GetBodyA();
            m_bodyA = m_joint1.GetBodyB();

            // Get geometry of joint1
            b2Transform xfA = m_bodyA.XF;
            float aA = m_bodyA.Sweep.a;
            b2Transform xfC = m_bodyC.XF;
            float aC = m_bodyC.Sweep.a;

            if (m_typeA == b2JointType.e_revoluteJoint)
            {
                b2RevoluteJoint revolute = (b2RevoluteJoint)def.joint1;
                m_localAnchorC = revolute.GetLocalAnchorA();
                m_localAnchorA = revolute.GetLocalAnchorB();
                m_referenceAngleA = revolute.GetReferenceAngle();
                m_localAxisC.SetZero();

                coordinateA = aA - aC - m_referenceAngleA;
            }
            else
            {
                b2PrismaticJoint prismatic = (b2PrismaticJoint)def.joint1;
                m_localAnchorC = prismatic.GetLocalAnchorA();
                m_localAnchorA = prismatic.GetLocalAnchorB();
                m_referenceAngleA = prismatic.GetReferenceAngle();
                m_localAxisC = prismatic.GetLocalXAxisA();

                b2Vec2 pC = m_localAnchorC;
                b2Vec2 pA = b2Math.b2MulT(xfC.q, b2Math.b2Mul(xfA.q, m_localAnchorA) + (xfA.p - xfC.p));
                coordinateA = b2Math.b2Dot(pA - pC, m_localAxisC);
            }

            m_bodyD = m_joint2.GetBodyA();
            m_bodyB = m_joint2.GetBodyB();

            // Get geometry of joint2
            b2Transform xfB = m_bodyB.XF;
            float aB = m_bodyB.Sweep.a;
            b2Transform xfD = m_bodyD.XF;
            float aD = m_bodyD.Sweep.a;

            if (m_typeB == b2JointType.e_revoluteJoint)
            {
                b2RevoluteJoint revolute = (b2RevoluteJoint)def.joint2;
                m_localAnchorD = revolute.GetLocalAnchorA();
                m_localAnchorB = revolute.GetLocalAnchorB();
                m_referenceAngleB = revolute.GetReferenceAngle();
                m_localAxisD.SetZero();

                coordinateB = aB - aD - m_referenceAngleB;
            }
            else
            {
                b2PrismaticJoint prismatic = (b2PrismaticJoint)def.joint2;
                m_localAnchorD = prismatic.GetLocalAnchorA();
                m_localAnchorB = prismatic.GetLocalAnchorB();
                m_referenceAngleB = prismatic.GetReferenceAngle();
                m_localAxisD = prismatic.GetLocalXAxisA();

                b2Vec2 pD = m_localAnchorD;
                b2Vec2 pB = b2Math.b2MulT(xfD.q, b2Math.b2Mul(xfB.q, m_localAnchorB) + (xfB.p - xfD.p));
                coordinateB = b2Math.b2Dot(pB - pD, m_localAxisD);
            }

            m_ratio = def.ratio;

            m_constant = coordinateA + m_ratio * coordinateB;

            m_impulse = 0.0f;
        }
Пример #4
0
        public Gears()
        {
            b2Body ground = null;
            {
                b2BodyDef bd  = new b2BodyDef();
                ground = m_world.CreateBody(bd);

                b2EdgeShape shape = new b2EdgeShape();
                shape.Set(new b2Vec2(50.0f, 0.0f), new b2Vec2(-50.0f, 0.0f));
                ground.CreateFixture(shape, 0.0f);
            }

            // Gears co
            {
                b2CircleShape circle1 = new b2CircleShape();
                circle1.Radius = 1.0f;

                b2PolygonShape box = new b2PolygonShape();
                box.SetAsBox(0.5f, 5.0f);

                b2CircleShape circle2 = new b2CircleShape();
                circle2.Radius = 2.0f;

                b2BodyDef bd1  = new b2BodyDef();
                bd1.type = b2BodyType.b2_staticBody;
                bd1.position.Set(10.0f, 9.0f);
                b2Body body1 = m_world.CreateBody(bd1);
                body1.CreateFixture(circle1, 0.0f);

                b2BodyDef bd2  = new b2BodyDef();
                bd2.type = b2BodyType.b2_dynamicBody;
                bd2.position.Set(10.0f, 8.0f);
                b2Body body2 = m_world.CreateBody(bd2);
                body2.CreateFixture(box, 5.0f);

                b2BodyDef bd3  = new b2BodyDef();
                bd3.type = b2BodyType.b2_dynamicBody;
                bd3.position.Set(10.0f, 6.0f);
                b2Body body3 = m_world.CreateBody(bd3);
                body3.CreateFixture(circle2, 5.0f);

                b2RevoluteJointDef jd1 = new b2RevoluteJointDef();
                jd1.Initialize(body2, body1, bd1.position);
                b2Joint joint1 = m_world.CreateJoint(jd1);

                b2RevoluteJointDef jd2 = new b2RevoluteJointDef();
                jd2.Initialize(body2, body3, bd3.position);
                b2Joint joint2 = m_world.CreateJoint(jd2);

                b2GearJointDef jd4 = new b2GearJointDef();
                jd4.BodyA = body1;
                jd4.BodyB = body3;
                jd4.joint1 = joint1;
                jd4.joint2 = joint2;
                jd4.ratio = circle2.Radius / circle1.Radius;
                m_world.CreateJoint(jd4);
            }

            {
                b2CircleShape circle1 = new b2CircleShape();
                circle1.Radius = 1.0f;

                b2CircleShape circle2 = new b2CircleShape();
                circle2.Radius = 2.0f;

                b2PolygonShape box = new b2PolygonShape();
                box.SetAsBox(0.5f, 5.0f);

                b2BodyDef bd1  = new b2BodyDef();
                bd1.type = b2BodyType.b2_dynamicBody;
                bd1.position.Set(-3.0f, 12.0f);
                b2Body body1 = m_world.CreateBody(bd1);
                body1.CreateFixture(circle1, 5.0f);

                b2RevoluteJointDef jd1 = new b2RevoluteJointDef();
                jd1.BodyA = ground;
                jd1.BodyB = body1;
                jd1.localAnchorA = ground.GetLocalPoint(bd1.position);
                jd1.localAnchorB = body1.GetLocalPoint(bd1.position);
                jd1.referenceAngle = body1.Angle - ground.Angle;
                m_joint1 = (b2RevoluteJoint) m_world.CreateJoint(jd1);

                b2BodyDef bd2  = new b2BodyDef();
                bd2.type = b2BodyType.b2_dynamicBody;
                bd2.position.Set(0.0f, 12.0f);
                b2Body body2 = m_world.CreateBody(bd2);
                body2.CreateFixture(circle2, 5.0f);

                b2RevoluteJointDef jd2 = new b2RevoluteJointDef();
                jd2.Initialize(ground, body2, bd2.position);
                m_joint2 = (b2RevoluteJoint) m_world.CreateJoint(jd2);

                b2BodyDef bd3  = new b2BodyDef();
                bd3.type = b2BodyType.b2_dynamicBody;
                bd3.position.Set(2.5f, 12.0f);
                b2Body body3 = m_world.CreateBody(bd3);
                body3.CreateFixture(box, 5.0f);

                b2PrismaticJointDef jd3 = new b2PrismaticJointDef();
                jd3.Initialize(ground, body3, bd3.position, new b2Vec2(0.0f, 1.0f));
                jd3.lowerTranslation = -5.0f;
                jd3.upperTranslation = 5.0f;
                jd3.enableLimit = true;

                m_joint3 = (b2PrismaticJoint) m_world.CreateJoint(jd3);

                b2GearJointDef jd4 = new b2GearJointDef();
                jd4.BodyA = body1;
                jd4.BodyB = body2;
                jd4.joint1 = m_joint1;
                jd4.joint2 = m_joint2;
                jd4.ratio = circle2.Radius / circle1.Radius;
                m_joint4 = (b2GearJoint) m_world.CreateJoint(jd4);

                b2GearJointDef jd5 = new b2GearJointDef();
                jd5.BodyA = body2;
                jd5.BodyB = body3;
                jd5.joint1 = m_joint2;
                jd5.joint2 = m_joint3;
                jd5.ratio = -1.0f / circle2.Radius;
                m_joint5 = (b2GearJoint) m_world.CreateJoint(jd5);
            }
        }
Пример #5
0
        // SIN REVISAR
        b2Joint j2b2Joint(b2World world, JObject jointValue)
        {
            b2Joint joint = null;

            int bodyIndexA = (int)jointValue["bodyA"];
            int bodyIndexB = (int)jointValue["bodyB"];
            if (bodyIndexA >= m_bodies.Count || bodyIndexB >= m_bodies.Count)
                return null;

            // set features common to all joints
            //var bodyA = m_bodies[bodyIndexA];
            //var bodyB = m_bodies[bodyIndexB];
            //var collideConnected = jointValue["collideConnected"] == null ? false : (bool)jointValue["collideConnected"];

            // keep these in scope after the if/else below
            b2RevoluteJointDef revoluteDef;
            b2PrismaticJointDef prismaticDef;
            b2DistanceJointDef distanceDef;
            b2PulleyJointDef pulleyDef;
            b2MouseJointDef mouseDef;
            b2GearJointDef gearDef;
            //b2WheelJoint wheelDef;
            b2WeldJointDef weldDef;
            b2FrictionJointDef frictionDef;
            b2RopeJointDef ropeDef;
            //MotorJoint motorDef;

            b2JointDef jointDef = null;

            b2Vec2 mouseJointTarget = new b2Vec2(0, 0);

            string type = jointValue["type"].ToString() == null ? "" : jointValue["type"].ToString();

            if (type == "revolute")
            {

                jointDef = revoluteDef = new b2RevoluteJointDef(); // JointFactory.CreateRevoluteJoint(world, bodyA, bodyB, jsonToVec("anchorB", jointValue));
                revoluteDef.localAnchorA = jsonToVec("anchorA", jointValue);
                revoluteDef.localAnchorB = jsonToVec("anchorB", jointValue);
                revoluteDef.referenceAngle = jsonToFloat("refAngle", jointValue);
                revoluteDef.enableLimit = jointValue["enableLimit"] == null ? false : (bool)jointValue["enableLimit"];
                revoluteDef.lowerAngle = jsonToFloat("lowerLimit", jointValue);
                revoluteDef.upperAngle = jsonToFloat("upperLimit", jointValue);
                revoluteDef.enableMotor = jointValue["enableMotor"] == null ? false : (bool)jointValue["enableMotor"];
                revoluteDef.motorSpeed = jsonToFloat("motorSpeed", jointValue);
                revoluteDef.maxMotorTorque = jsonToFloat("maxMotorTorque", jointValue);
            }
            else if (type == "prismatic")
            {
                jointDef = prismaticDef = new b2PrismaticJointDef(); //JointFactory.CreatePrismaticJoint(world, bodyA, bodyB, localAnchorB, localAxis);

                prismaticDef.localAnchorA = jsonToVec("anchorA", jointValue);
                prismaticDef.localAnchorB = jsonToVec("anchorB", jointValue);

                if (jointValue["localAxisA"] != null)
                    prismaticDef.localAxisA = jsonToVec("localAxisA", jointValue);
                else
                    prismaticDef.localAxisA = jsonToVec("localAxis1", jointValue);

                prismaticDef.referenceAngle = jsonToFloat("refAngle", jointValue);

                prismaticDef.enableLimit = jointValue["enableLimit"] == null ? false : (bool)jointValue["enableLimit"];

                prismaticDef.lowerTranslation = jsonToFloat("lowerLimit", jointValue);
                prismaticDef.upperTranslation = jsonToFloat("upperLimit", jointValue);

                prismaticDef.enableMotor = jointValue["enableMotor"] == null ? false : (bool)jointValue["enableMotor"];

                prismaticDef.motorSpeed = jsonToFloat("motorSpeed", jointValue);
                prismaticDef.maxMotorForce = jsonToFloat("maxMotorForce", jointValue);

            }
            else if (type == "distance")
            {

                jointDef = distanceDef = new b2DistanceJointDef();
                distanceDef.localAnchorA = jsonToVec("anchorA", jointValue);
                distanceDef.localAnchorB = jsonToVec("anchorB", jointValue);
                distanceDef.length = jsonToFloat("length", jointValue);
                distanceDef.frequencyHz = jsonToFloat("frequency", jointValue);
                distanceDef.dampingRatio = jsonToFloat("dampingRatio", jointValue);

            }
            else if (type == "pulley")
            {

                jointDef = pulleyDef = new b2PulleyJointDef();
                pulleyDef.groundAnchorA = jsonToVec("groundAnchorA", jointValue);
                pulleyDef.groundAnchorB = jsonToVec("groundAnchorB", jointValue);
                pulleyDef.localAnchorA = jsonToVec("anchorA", jointValue);
                pulleyDef.localAnchorB = jsonToVec("anchorB", jointValue);
                pulleyDef.lengthA = jsonToFloat("lengthA", jointValue);
                pulleyDef.lengthB = jsonToFloat("lengthB", jointValue);
                pulleyDef.ratio = jsonToFloat("ratio", jointValue);

            }
            else if (type == "mouse")
            {
                jointDef = mouseDef = new b2MouseJointDef();
                mouseJointTarget = jsonToVec("target", jointValue);
                mouseDef.target = jsonToVec("anchorB", jointValue);// alter after creating joint
                mouseDef.maxForce = jsonToFloat("maxForce", jointValue);
                mouseDef.frequencyHz = jsonToFloat("frequency", jointValue);
                mouseDef.dampingRatio = jsonToFloat("dampingRatio", jointValue);
            }
            // Gear joints are apparently not implemented in JBox2D yet, but
            // when they are, commenting out the following section should work.

            else if (type == "gear")
            {

                jointDef = gearDef = new b2GearJointDef();  //JointFactory.CreateGearJoint(world, joint1, joint2, ratio);
                int jointIndex1 = (int)jointValue["joint1"];
                int jointIndex2 = (int)jointValue["joint2"];
                var joint1 = m_joints[jointIndex1];
                var joint2 = m_joints[jointIndex2];
                var ratio = jsonToFloat("ratio", jointValue);

                //joint = gearDef = JointFactory.CreateGearJoint(world, joint1, joint2, ratio);

            }

            // Wheel joints are apparently not implemented in JBox2D yet, but
            // when they are, commenting out the following section should work.

            else if (type == "wheel")
            {

                jointDef = revoluteDef = new b2RevoluteJointDef();
                revoluteDef.localAnchorA = jsonToVec("anchorA", jointValue);
                revoluteDef.localAnchorB = jsonToVec("anchorB", jointValue);

                revoluteDef.enableMotor = jointValue["enableMotor"] == null ? false : (bool)jointValue["enableMotor"];

                revoluteDef.motorSpeed = jsonToFloat("motorSpeed", jointValue);
                revoluteDef.maxMotorTorque = jsonToFloat("maxMotorTorque", jointValue);

                //jointDef = wheelDef = new b2WheelJointDef(); //JointFactory.CreateWheelJoint(world, bodyA, bodyB, localAnchorB, localAxisA);

                //var localAnchorA = jsonToVec("anchorA", jointValue);
                //var localAnchorB = (jsonToVec("anchorB", jointValue));
                //var localAxisA = (jsonToVec("localAxisA", jointValue));
                //var enableMotor = jointValue["enableMotor"] == null ? false : (bool)jointValue["enableMotor"];
                //var motorSpeed = jsonToFloat("motorSpeed", jointValue);
                //var maxMotorTorque = jsonToFloat("maxMotorTorque", jointValue);
                //var frequencyHz = jsonToFloat("springFrequency", jointValue);
                //var dampingRatio = jsonToFloat("springDampingRatio", jointValue);

                //wheelDef.LocalAnchorA = localAnchorA;
                //wheelDef.LocalAnchorB = localAnchorB;
                //wheelDef.MotorEnabled = enableMotor;
                //wheelDef.MotorSpeed = motorSpeed;
                //wheelDef.SpringFrequencyHz = frequencyHz;
                //wheelDef.MaxMotorTorque = maxMotorTorque;
                //wheelDef.SpringDampingRatio = dampingRatio;
            }
            else if (type == "weld")
            {
                jointDef = weldDef = new b2WeldJointDef();
                weldDef.localAnchorA = jsonToVec("anchorA", jointValue);
                weldDef.localAnchorB = jsonToVec("anchorB", jointValue);
                weldDef.referenceAngle = 0;

            }
            else if (type == "friction")
            {
                jointDef = frictionDef = new b2FrictionJointDef();
                frictionDef.localAnchorA = jsonToVec("anchorA", jointValue);
                frictionDef.localAnchorB = jsonToVec("anchorB", jointValue);
                frictionDef.maxForce = jsonToFloat("maxForce", jointValue);
                frictionDef.maxTorque = jsonToFloat("maxTorque", jointValue);
            }
            else if (type == "rope")
            {
                jointDef = ropeDef = new b2RopeJointDef();
                ropeDef.localAnchorA = jsonToVec("anchorA", jointValue);
                ropeDef.localAnchorB = jsonToVec("anchorB", jointValue);
                ropeDef.maxLength = jsonToFloat("maxLength", jointValue);
            }

            //else if (type == "motor")
            //{
            //    var maxForce = jsonToFloat("maxForce", jointValue);
            //    var maxMotorTorque = jsonToFloat("maxTorque", jointValue);
            //    var angularOffset = jsonToFloat("refAngle", jointValue);

            //    joint = motorDef = new MotorJoint(bodyA, bodyB);
            //    world.AddJoint(joint);
            //    motorDef.LinearOffset = jsonToVec("anchorA", jointValue);
            //    motorDef.MaxForce = maxForce;
            //    motorDef.MaxTorque = maxMotorTorque;
            //    motorDef.AngularOffset = angularOffset;
            //}

            if (null != jointDef)
            {
                // set features common to all joints
                jointDef.BodyA = m_bodies[bodyIndexA];
                jointDef.BodyB = m_bodies[bodyIndexB];

                jointDef.CollideConnected = jointValue["collideConnected"] == null ? false : (bool)jointValue["collideConnected"];

                joint = world.CreateJoint(jointDef);

                if (type.Equals("mouse"))
                    ((b2MouseJoint)joint).SetTarget(mouseJointTarget);

                String jointName = jointValue["name"] == null ? "" : (string)jointValue["name"];

                if (!jointName.Equals(""))
                {
                    SetJointName(joint, jointName);
                }
            }

            return joint;
        }