C# Dynamics.b2BodyDef类代码示例

		void CreateNinja() {
			
			
			spriteImageName = String.Format("{0}_standing", baseImageName); 

			onGround = false;
			
			// Define the dynamic body.
			var bodyDef = new b2BodyDef();
			bodyDef.type = b2BodyType.b2_staticBody; //or you could use b2DynamicBody to start the ninja as dynamic
			
			bodyDef.position.Set(initialLocation.X/Constants.PTM_RATIO, initialLocation.Y/Constants.PTM_RATIO);
			
			var shape = new b2CircleShape();
			var radiusInMeters = (40 / Constants.PTM_RATIO) * 0.5f; //increase or decrease 40 for a different circle size definition
			
			shape.Radius = radiusInMeters;
			
			
			// Define the dynamic body fixture.
			var fixtureDef = new b2FixtureDef();
			fixtureDef.shape = shape;	
			fixtureDef.density = 1.0f;
			fixtureDef.friction = 1.0f;
			fixtureDef.restitution =  0.1f;
			
			CreateBodyWithSpriteAndFixture(theWorld, bodyDef, fixtureDef, spriteImageName);
			
		}

        public SphereStack()
        {
            {
                b2BodyDef bd  = new b2BodyDef();
                b2Body ground = m_world.CreateBody(bd);

                b2EdgeShape shape = new b2EdgeShape();
                shape.Set(new b2Vec2(-40.0f, 0.0f), new b2Vec2(40.0f, 0.0f));
                ground.CreateFixture(shape, 0.0f);
            }

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

                for (int i = 0; i < e_count; ++i)
                {
                    b2BodyDef bd  = new b2BodyDef();
                    bd.type = b2BodyType.b2_dynamicBody;
                    bd.position.Set(0.0f, 4.0f + 3.0f * i);

                    m_bodies[i] = m_world.CreateBody(bd);

                    m_bodies[i].CreateFixture(shape, 1.0f);

                    m_bodies[i].LinearVelocity = new b2Vec2(0.0f, -50.0f);
                }
            }
        }

        public JumpPad(b2Vec2 JumpImpuls, CCPoint Position, b2World gameWorld)
        {
            this.Texture = new CCTexture2D ("jumppad");
            this.Scale = SpriteScale;
            this.Position = Position;
            this.IsAntialiased = false;

            jumpImpuls = JumpImpuls;
            totalJumps = 0;

            //box2d
            b2BodyDef jumpPadDef = new b2BodyDef ();
            jumpPadDef.type = b2BodyType.b2_kinematicBody;
            jumpPadDef.position = new b2Vec2 ((Position.X + this.ScaledContentSize.Width/2)/PhysicsHandler.pixelPerMeter, (Position.Y + this.ScaledContentSize.Height/4) / PhysicsHandler.pixelPerMeter);
            JumpPadBody = gameWorld.CreateBody (jumpPadDef);

            b2PolygonShape jumpPadShape = new b2PolygonShape ();
            jumpPadShape.SetAsBox ((float)this.ScaledContentSize.Width / PhysicsHandler.pixelPerMeter / 2, (float)this.ScaledContentSize.Height / PhysicsHandler.pixelPerMeter / 4);// /4 weil die hitbox nur die hälfte der textur ist

            b2FixtureDef jumpPadFixture = new b2FixtureDef ();
            jumpPadFixture.shape = jumpPadShape;
            jumpPadFixture.density = 0.0f; //Dichte
            jumpPadFixture.restitution = 0f; //Rückprall
            jumpPadFixture.friction = 0f;
            jumpPadFixture.userData = WorldFixtureData.jumppad;
            JumpPadBody.CreateFixture (jumpPadFixture);
            //
        }

        public VaryingRestitution()
        {
            {
                b2BodyDef bd  = new b2BodyDef();
                b2Body ground = m_world.CreateBody(bd);

                b2EdgeShape shape = new b2EdgeShape();
                shape.Set(new b2Vec2(-40.0f, 0.0f), new b2Vec2(40.0f, 0.0f));
                ground.CreateFixture(shape, 0.0f);
            }

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

                b2FixtureDef fd = new b2FixtureDef();
                fd.shape = shape;
                fd.density = 1.0f;

                float[] restitution = {0.0f, 0.1f, 0.3f, 0.5f, 0.75f, 0.9f, 1.0f};

                for (int i = 0; i < 7; ++i)
                {
                    b2BodyDef bd  = new b2BodyDef();
                    bd.type = b2BodyType.b2_dynamicBody;
                    bd.position.Set(-10.0f + 3.0f * i, 20.0f);

                    b2Body body = m_world.CreateBody(bd);

                    fd.restitution = restitution[i];
                    body.CreateFixture(fd);
                }
            }
        }

        public void Break()
        {
            // Create two bodies from one.
            b2Body body1 = m_piece1.Body;
            b2Vec2 center = body1.WorldCenter;

            body1.DestroyFixture(m_piece2);
            m_piece2 = null;

            b2BodyDef bd  = new b2BodyDef();
            bd.type = b2BodyType.b2_dynamicBody;
            bd.position = body1.Position;
            bd.angle = body1.Angle;

            b2Body body2 = m_world.CreateBody(bd);
            m_piece2 = body2.CreateFixture(m_shape2, 1.0f);

            // Compute consistent velocities for new bodies based on
            // cached velocity.
            b2Vec2 center1 = body1.WorldCenter;
            b2Vec2 center2 = body2.WorldCenter;

            var diff1 = center1 - center;
            var diff2 = center2 - center;

            b2Vec2 velocity1 = m_velocity + b2Math.b2Cross(m_angularVelocity, ref diff1);
            b2Vec2 velocity2 = m_velocity + b2Math.b2Cross(m_angularVelocity, ref diff2);

            body1.AngularVelocity = m_angularVelocity;
            body1.LinearVelocity = velocity1;

            body2.AngularVelocity = m_angularVelocity;
            body2.LinearVelocity = velocity2;
        }

        public Breakable()
        {
            // Ground body
            {
                b2BodyDef bd  = new b2BodyDef();
                b2Body ground = m_world.CreateBody(bd);

                b2EdgeShape shape = new b2EdgeShape();
                shape.Set(new b2Vec2(-40.0f, 0.0f), new b2Vec2(40.0f, 0.0f));
                ground.CreateFixture(shape, 0.0f);
            }

            // Breakable dynamic body
            {
                b2BodyDef bd  = new b2BodyDef();
                bd.type = b2BodyType.b2_dynamicBody;
                bd.position = new b2Vec2(0.0f, 40.0f);
                bd.angle = 0.25f * b2Settings.b2_pi;
                m_body1 = m_world.CreateBody(bd);

                m_shape1.SetAsBox(0.5f, 0.5f, new b2Vec2(-0.5f, 0.0f), 0.0f);
                m_piece1 = m_body1.CreateFixture(m_shape1, 1.0f);

                m_shape2.SetAsBox(0.5f, 0.5f, new b2Vec2(0.5f, 0.0f), 0.0f);
                m_piece2 = m_body1.CreateFixture(m_shape2, 1.0f);
            }

            m_break = false;
            m_broke = false;
        }

        void InitPhysics()
        {
            var gravity = new b2Vec2(0.0f, -10.0f);
            world = new b2World(gravity);

            world.SetAllowSleeping(true);
            world.SetContinuousPhysics(true);

            var def = new b2BodyDef();
            def.allowSleep = true;
            def.position = b2Vec2.Zero;
            def.type = b2BodyType.b2_staticBody;

            b2Body groundBody = world.CreateBody(def);
            groundBody.SetActive(true);

            b2EdgeShape groundBox = new b2EdgeShape();
            groundBox.Set(b2Vec2.Zero, new b2Vec2(900, 100));

            b2FixtureDef fd = new b2FixtureDef();
            fd.friction = 0.3f;
            fd.restitution = 0.1f;
            fd.shape = groundBox;

            groundBody.CreateFixture(fd);
        }

 public MouseTouch(b2World world, RubeBasicLayer layer)
 {
     parent = layer;
     m_world = world;
     b2BodyDef bodyDef = new b2BodyDef();
     m_groundBody = m_world.CreateBody(bodyDef);
 }

        public ContinuousTest()
        {
            {
                b2BodyDef bd  = new b2BodyDef();
                bd.position.Set(0.0f, 0.0f);
                b2Body body = m_world.CreateBody(bd);

                b2EdgeShape edge = new b2EdgeShape();

                edge.Set(new b2Vec2(-10.0f, 0.0f), new b2Vec2(10.0f, 0.0f));
                body.CreateFixture(edge, 0.0f);

                b2PolygonShape shape = new b2PolygonShape();
                shape.SetAsBox(0.2f, 1.0f, new b2Vec2(0.5f, 1.0f), 0.0f);
                body.CreateFixture(shape, 0.0f);
            }

#if true
            {
                b2BodyDef bd  = new b2BodyDef();
                bd.type = b2BodyType.b2_dynamicBody;
                bd.position.Set(0.0f, 20.0f);
                //bd.angle = 0.1f;

                b2PolygonShape shape = new b2PolygonShape();
                shape.SetAsBox(2.0f, 0.1f);

                m_body = m_world.CreateBody(bd);
                m_body.CreateFixture(shape, 1.0f);

                m_angularVelocity = Rand.RandomFloat(-50.0f, 50.0f);
                //m_angularVelocity = 46.661274f;
                m_body.LinearVelocity = new b2Vec2(0.0f, -100.0f);
                m_body.AngularVelocity = m_angularVelocity;
            }
#else
        {
            b2BodyDef bd  = new b2BodyDef();
            bd.type = b2BodyType.b2_dynamicBody;
            bd.position.Set(0.0f, 2.0f);
            b2Body body = m_world.CreateBody(bd);

            b2CircleShape shape = new b2CircleShape();
            shape.Position = b2Vec2.Zero;
            shape.Radius = 0.5f;
            body.CreateFixture(shape, 1.0f);

            bd.bullet = true;
            bd.position.Set(0.0f, 10.0f);
            body = m_world.CreateBody(bd);
            body.CreateFixture(shape, 1.0f);
            body.LinearVelocity = new b2Vec2(0.0f, -100.0f);
        }
#endif
        }

        public Pulleys()
        {
            float y = 16.0f;
            float L = 12.0f;
            float a = 1.0f;
            float b = 2.0f;

            b2Body ground = null;
            {
                b2BodyDef bd  = new b2BodyDef();
                ground = m_world.CreateBody(bd);

                b2EdgeShape edge = new b2EdgeShape();
                edge.Set(new b2Vec2(-40.0f, 0.0f), new b2Vec2(40.0f, 0.0f));
                //ground->CreateFixture(&shape, 0.0f);

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

                circle.Position = new b2Vec2(-10.0f, y + b + L);
                ground.CreateFixture(circle, 0.0f);

                circle.Position = new b2Vec2(10.0f, y + b + L);
                ground.CreateFixture(circle, 0.0f);
            }

            {

                b2PolygonShape shape = new b2PolygonShape();
                shape.SetAsBox(a, b);

                b2BodyDef bd  = new b2BodyDef();
                bd.type = b2BodyType.b2_dynamicBody;

                //bd.fixedRotation = true;
                bd.position.Set(-10.0f, y);
                b2Body body1 = m_world.CreateBody(bd);
                body1.CreateFixture(shape, 5.0f);

                bd.position.Set(10.0f, y);
                b2Body body2 = m_world.CreateBody(bd);
                body2.CreateFixture(shape, 5.0f);

                b2PulleyJointDef pulleyDef = new b2PulleyJointDef();
                b2Vec2 anchor1 = new b2Vec2(-10.0f, y + b);
                b2Vec2 anchor2 = new b2Vec2(10.0f, y + b);
                b2Vec2 groundAnchor1 = new b2Vec2(-10.0f, y + b + L);
                b2Vec2 groundAnchor2 = new b2Vec2(10.0f, y + b + L);
                pulleyDef.Initialize(body1, body2, groundAnchor1, groundAnchor2, anchor1, anchor2, 1.5f);

                m_joint1 = (b2PulleyJoint) m_world.CreateJoint(pulleyDef);
            }
        }

        public SensorTest()
        {
            {
                b2BodyDef bd  = new b2BodyDef();
                b2Body ground = m_world.CreateBody(bd);

                {
                    b2EdgeShape shape = new b2EdgeShape();
                    shape.Set(new b2Vec2(-40.0f, 0.0f), new b2Vec2(40.0f, 0.0f));
                    ground.CreateFixture(shape, 0.0f);
                }

#if false
            {
                b2FixtureDef sd = new b2FixtureDef();
                sd.SetAsBox(10.0f, 2.0f, new b2Vec2(0.0f, 20.0f), 0.0f);
                sd.isSensor = true;
                m_sensor = ground.CreateFixture(sd);
            }
#else
                {
                    b2CircleShape shape = new b2CircleShape();
                    shape.Radius = 5.0f;
                    shape.Position = new b2Vec2(0.0f, 10.0f);

                    b2FixtureDef fd = new b2FixtureDef();
                    fd.shape = shape;
                    fd.isSensor = true;
                    m_sensor = ground.CreateFixture(fd);
                }
#endif
            }

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

                for (int i = 0; i < e_count; ++i)
                {
                    b2BodyDef bd  = new b2BodyDef();
                    bd.type = b2BodyType.b2_dynamicBody;
                    bd.position.Set(-10.0f + 3.0f * i, 20.0f);
                    bd.userData = i; //  m_touching[i];

                    m_touching[i] = false;
                    m_bodies[i] = m_world.CreateBody(bd);

                    m_bodies[i].CreateFixture(shape, 1.0f);
                }
            }
        }

        //public const int e_columnCount = 1;
        //public const int e_rowCount = 1;

        public VerticalStack()
        {
            {
                b2BodyDef bd  = new b2BodyDef();
                b2Body ground = m_world.CreateBody(bd);

                b2EdgeShape shape = new b2EdgeShape();
                shape.Set(new b2Vec2(-40.0f, 0.0f), new b2Vec2(40.0f, 0.0f));
                ground.CreateFixture(shape, 0.0f);

                shape.Set(new b2Vec2(20.0f, 0.0f), new b2Vec2(20.0f, 20.0f));
                ground.CreateFixture(shape, 0.0f);
            }

            float[] xs = {0.0f, -10.0f, -5.0f, 5.0f, 10.0f};

            for (int j = 0; j < e_columnCount; ++j)
            {
                b2PolygonShape shape = new b2PolygonShape();
                shape.SetAsBox(0.5f, 0.5f);

                b2FixtureDef fd = new b2FixtureDef();
                fd.shape = shape;
                fd.density = 1.0f;
                fd.friction = 0.3f;

                for (int i = 0; i < e_rowCount; ++i)
                {
                    b2BodyDef bd  = new b2BodyDef();
                    bd.type = b2BodyType.b2_dynamicBody;

                    int n = j * e_rowCount + i;
                    Debug.Assert(n < e_rowCount * e_columnCount);
                    m_indices[n] = n;
                    bd.userData = m_indices[n];

                    float x = 0.0f;
                    //float32 x = RandomFloat(-0.02f, 0.02f);
                    //float32 x = i % 2 == 0 ? -0.025f : 0.025f;
                    bd.position.Set(xs[j] + x, 0.752f + 1.54f * i);
                    b2Body body = m_world.CreateBody(bd);

                    m_bodies[n] = body;

                    body.CreateFixture(fd);
                }
            }

            m_bullet = null;
        }

        public Confined()
        {
            {
                b2BodyDef bd  = new b2BodyDef();
                b2Body ground = m_world.CreateBody(bd);

                b2EdgeShape shape = new b2EdgeShape();

                // Floor
                shape.Set(new b2Vec2(-10.0f, 0.0f), new b2Vec2(10.0f, 0.0f));
                ground.CreateFixture(shape, 0.0f);

                // Left wall
                shape.Set(new b2Vec2(-10.0f, 0.0f), new b2Vec2(-10.0f, 20.0f));
                ground.CreateFixture(shape, 0.0f);

                // Right wall
                shape.Set(new b2Vec2(10.0f, 0.0f), new b2Vec2(10.0f, 20.0f));
                ground.CreateFixture(shape, 0.0f);

                // Roof
                shape.Set(new b2Vec2(-10.0f, 20.0f), new b2Vec2(10.0f, 20.0f));
                ground.CreateFixture(shape, 0.0f);
            }

            float radius = 0.5f;
            b2CircleShape shape1 = new b2CircleShape();
            shape1.Position = b2Vec2.Zero;
            shape1.Radius = radius;

            b2FixtureDef fd = new b2FixtureDef();
            fd.shape = shape1;
            fd.density = 1.0f;
            fd.friction = 0.1f;

            for (int j = 0; j < e_columnCount; ++j)
            {
                for (int i = 0; i < e_rowCount; ++i)
                {
                    b2BodyDef bd  = new b2BodyDef();
                    bd.type = b2BodyType.b2_dynamicBody;
                    bd.position.Set(-10.0f + (2.1f * j + 1.0f + 0.01f * i) * radius, (2.0f * i + 1.0f) * radius);
                    b2Body body = m_world.CreateBody(bd);

                    body.CreateFixture(fd);
                }
            }

            m_world.Gravity = new b2Vec2(0.0f, 0.0f);
        }

		void CreatePlatform() {
			
			// Define the dynamic body.
			var bodyDef = new b2BodyDef();
			bodyDef.type = b2BodyType.b2_staticBody; //or you could use b2_staticBody
			
			bodyDef.position.Set(initialLocation.X/Constants.PTM_RATIO, initialLocation.Y/Constants.PTM_RATIO);

			var shape = new b2PolygonShape();
			
			var num = 4;
			b2Vec2[] vertices = {
				new b2Vec2(-102.0f / Constants.PTM_RATIO, -49.5f / Constants.PTM_RATIO),
				new b2Vec2(-113.0f / Constants.PTM_RATIO, -81.5f / Constants.PTM_RATIO),
				new b2Vec2(113.0f / Constants.PTM_RATIO, -84.5f / Constants.PTM_RATIO),
				new b2Vec2(106.0f / Constants.PTM_RATIO, -47.5f / Constants.PTM_RATIO)
			};
			
			shape.Set(vertices, num);
			
			
			// Define the dynamic body fixture.
			var fixtureDef = new b2FixtureDef();
			fixtureDef.shape = shape;	
			fixtureDef.density = 1.0f;
			fixtureDef.friction = 0.3f;
			fixtureDef.restitution =  0.1f;
			
			CreateBodyWithSpriteAndFixture(theWorld, bodyDef, fixtureDef, spriteImageName);
			
			//CONTINUING TO ADD BODY SHAPE....
			
			// THIS IS THE Sling base....
			
			//row 1, col 1
			var num2 = 4;
			b2Vec2[] vertices2 = {
				new b2Vec2(41.0f / Constants.PTM_RATIO, -6.5f / Constants.PTM_RATIO),
				new b2Vec2(35.0f / Constants.PTM_RATIO, -57.5f / Constants.PTM_RATIO),
				new b2Vec2(57.0f / Constants.PTM_RATIO, -65.5f / Constants.PTM_RATIO),
				new b2Vec2(49.0f / Constants.PTM_RATIO, -7.5f / Constants.PTM_RATIO)
			};
			
			shape.Set(vertices2, num2);
			fixtureDef.shape = shape;
			body.CreateFixture(fixtureDef);
			
		}

        protected void CreateBodyWithSpriteAndFixture(b2World world, b2BodyDef bodyDef,
                                                       b2FixtureDef fixtureDef, string spriteName)
        {
            // this is the meat of our class, it creates (OR recreates) the body in the world with the body definition, fixture definition and sprite name

            RemoveBody(); //if remove the body if it already exists
            RemoveSprite(); //if remove the sprite if it already exists

            sprite = new CCSprite(spriteName);
            AddChild(sprite);

            body = world.CreateBody(bodyDef);
            body.UserData = this;

            if (fixtureDef != null)
                body.CreateFixture(fixtureDef);
        }