C# Dynamics.Fixture类代码示例

 public void AreaBody_OnSeparation(Fixture fixa, Fixture fixb)
 {
     if (fixb.Body.BodyId == 19)
         {
             isTouchingPickUp = false;
         }
 }

        public override Body CreateBody(World world)
        {
            Int32 count = 0;
            foreach (var key in _resource.TileDefinitionKeys)
            {
                var tileDefinition = (TerrainTileDefinitionResource)ResourceDictionary.GetResource(key);

                if (!String.IsNullOrEmpty(tileDefinition.CollisionHullKey))
                {
                    var vertices = new Vertices((Vector2[])this.ResourceDictionary.GetResource(tileDefinition.CollisionHullKey));

                    var body = new Body(world);
                    _bodies.Add(body);
                    body.BodyType = BodyType.Static;

                    var location = ((ILocatable)_actor).Location;
                    body.Position = new Vector2(((count % _resource.Columns) * _resource.TileWidth + location.X) / Settings.MetersToPixels, ((Int32)(count / _resource.Columns) * _resource.TileHeight + location.Y) / Settings.MetersToPixels);
                    
                    var shape = new PolygonShape(vertices, 0f);
                    var fixture = new Fixture(body, shape, 1.0f);
                    
                    fixture.UserData = new CollisionData { Actor = _actor, Data = tileDefinition.CollisionData };
                }
                
                count++;
            }
            return null;
        }

        protected override bool OnCollision(Fixture projectile, Fixture collided, Contact contact)
        {
            if (NoCollide)
                return false;

            var collidedUnit = (collided.Body.UserData is Unit) ? (Unit)(collided.Body.UserData) : null;

            if (collidedUnit != null) {
                if (collidedUnit == Owner) {
                    Owner.ModifyAttackCooldown(-1000f);
                    Expire();
                }
                else {
                    foreach (Aura aura in Auras) {
                        collidedUnit.AddAura(aura);
                    }
                    collidedUnit.Hurt(Damage);
                    Body.LinearVelocity = Vector2.Zero;
                    Body.IgnoreGravity = false;
                    Body.ApplyLinearImpulse(new Vector2((Owner.Position.X - collidedUnit.Position.X)*7, -200));
                    Body.ApplyTorque(-2000f);
                    Body.CollidesWith = Category.Cat1 | Category.Cat2;
                    Body.CollisionCategories = Category.Cat5;
                }
            }

            return false;
        }

        public Turret(Vector2 farseerLoc, World w, RagdollManager r, Fixture f)
        {
            

            DebugMaterial gray = new DebugMaterial(MaterialType.Blank)
            {
                Color = Color.DarkGray
            };

            body = new Body(w);
            pivot = FixtureFactory.AttachCircle(.9f, 1, body, gray);
            FixtureFactory.AttachRectangle(barrelLength, .5f, 1, new Vector2(barrelLength / 2, 0), body, gray);
            body.Position = farseerLoc;
            body.BodyType = BodyType.Dynamic;
            //b.CollidesWith = Category.None;

            if (f == null)
            {

                motor = JointFactory.CreateFixedRevoluteJoint(w, body, Vector2.Zero, farseerLoc);
            }
            else
            {
                motor = new RevoluteJoint(body, f.Body, Vector2.Zero, f.Body.GetLocalPoint(farseerLoc));
                w.AddJoint(motor);
            }

            motor.MotorEnabled = true;
            motor.MaxMotorTorque = 5000;

            Init(w, r);
        }

 public ProximityTrigger(Body sensorBody, Fixture sensorTemplate)
 {
     this.sensorBody = sensorBody;
     this.CreateSensors(sensorTemplate);
     this.IsEnabled = true;
     this.IsContinuous = false;
 }

        bool body_OnCollision(Fixture fixtureA, Fixture fixtureB, FarseerPhysics.Dynamics.Contacts.Contact contact)
        {
            if (body.BodyType == BodyType.Static) return true;

            Fixture surface;
            if (fixtureA.Body == body)
                surface = fixtureB;
            else
                surface = fixtureA;

            if (surface.Body.BodyType == BodyType.Static && surface.Shape.MassData.Area > 100)
            {
                // rotate to contact normal
                Vector2 normal = contact.Manifold.LocalNormal;

                if (Vector2.Dot(normal, body.LinearVelocity) > 0)
                {
                    return false;
                }

                isPendingAttach = true;
                pendingRotation = (float)Math.Atan2(normal.Y, normal.X);

                body.CollidesWith = Category.None;

                return false;
            }

            return true;
        }

        // Collision handlers
        public bool CollisionWithEnemy(Fixture f1, Fixture f2, Contact contact)
        {
            Vector2 normal;
            FixedArray2<Vector2> points;
            contact.GetWorldManifold(out normal, out points);

            foreach (IGameComponent comp in this.game.Components)
            {
                GameEnemy enemy = comp as GameEnemy;
                if (enemy != null)
                {
                    if (enemy.getFixture() == f2)
                    {

                        if ((Math.Abs(normal.Y) > Math.Abs(normal.X)) && (normal.Y < 0))    // The contact is coming from above
                        {
                            enemy.Die(); // Uncomment this line if we decide to fix the timing so we dispose after the animation
                            this.increaseScore(10);
                            this.Jump();
                            break;
                        }
                        else
                        {
                            this.Die();
                        }

                        break;
                    }
                }
            }

            return true;
        }

        public virtual bool OnCollision(Fixture fixtureA, Fixture fixtureB, Contact contact)
        {
            Vector2 normal = Vector2.Zero;

            Contact currentContact = contact;
            Vector2 nextNormal = Vector2.Zero;
            FixedArray2<Vector2> fx; // No idea what that is, but the function wants it
            // Iterate through the contacts, summing the normals
            do
            {
                Vector2 vec = Vector2.Zero;
                contact.GetWorldManifold(out vec, out fx);
                normal += vec;
                currentContact = currentContact.Next;
            } while (currentContact != null);

            if (normal.Y > Y && normal.X == 0)
            {
                Pressed = true;

                _pressing.Add(fixtureB);
            }

            return true;
        }

        public Ship(World world, SpawnData spawn, int id)
        {
            Ball = null;
            Id = id;
            IsThrusting = false;
            IsReversing = false;
            IsBoosting = false;
            IsLeftTurning = false;
            IsRightTurning = false;
            IsShooting = false;
            IsBlocked = false;
            IsBlockedFrame = false;

            Color = spawn.Color;
            var body = new Body(world);

            body.Rotation = FMath.Atan2(-spawn.Position.Y, -spawn.Position.X);
            body.Position = spawn.Position;
            var shape = new CircleShape(radius, 1f);
            body.BodyType = BodyType.Dynamic;
            body.FixedRotation = true;
            Fixture = body.CreateFixture(shape);
            Fixture.Restitution = restitution;

            var bodyGravity = new Body(world);
            bodyGravity.Position = spawn.Position;
            var shapeGravity = new CircleShape(radiusGravity, 1f);
            bodyGravity.FixedRotation = true;
            FixtureGravity = bodyGravity.CreateFixture(shapeGravity);
            FixtureGravity.IsSensor = true;
        }

        private float HandleRaycast(Fixture fixture, Vector2 point, Vector2 normal, float fraction)
        {
            if (fixture.CollisionCategories == _type.Category)
                return fraction;

            var dist = (point - Body.Position).Length();

            var linksCount = (int)(Math.Floor(dist / LinksHeight) / 2);
            if (linksCount == 0)
                return fraction;

            // TODO: adapt this to Farseer 3.5
            /*var chain = Add(K2.World.CreateChain(Body.Position, point, .005f, LinksHeight, linksCount, 1, false));

            if (!chain.Bodies.Any())
                return 0;

            chain.Bodies.ForEach(b => b.SetCollisionType(_type));

            var first = chain.Bodies.First();
            var last = chain.Bodies.Last();
            K2.World.CreateRevoluteJoint(fixture.Body, last, new Vector2(0, LinksHeight));
            K2.World.CreateRevoluteJoint(Body, chain.Bodies.First(), Vector2.Zero);
            //_joint = _factory.CreateDistanceJoint(first, last, new Vector2(0, LinksHeight), Vector2.Zero);*/
            return 0;
        }

        public PhysicsGameObject(Texture2D texture, World world, bool isStatic,
            Vector2 position, float scale, float density, float depth)
        {
            this.texture = texture;
            this.scale = scale;
            this.density = density;
            this.depth = depth;

            //loads body details
            objectBody = new Body(world);
            objectBody.Position = position;
            if (isStatic)
                objectBody.BodyType = BodyType.Static;
            else
                objectBody.IsStatic = false;
            this.scale = scale;
            this.depth = depth;

            //loads fixture details
            objectFixture = FixtureFactory.AttachRectangle(
               texture.Width / PIXELS_PER_METER,
               texture.Height / PIXELS_PER_METER,
               1, Vector2.Zero, objectBody);
            objectFixture.Restitution = RESTITUTION;
            objectFixture.Friction = FRICTION;
        }

		public void LoadContent(ContentManager content, World world, Vector2 position, Vector2 size)
		{
			body = BodyFactory.CreateRectangle(world, size.X, size.Y, 1f);

			body.FixedRotation = true;

			body.FixtureList[0].UserData = 9000;

			body.Position = ConvertUnits.ToSimUnits(position);

			body.BodyType = BodyType.Dynamic;

            CircleShape circle1 = new CircleShape(size.X / 4, 1f);
            CircleShape circle2 = new CircleShape(size.Y / 6, 1f);
            CircleShape circle3 = new CircleShape(size.Y / 6, 1f);

            circle1.Position = new Vector2(0, -size.Y / 3);
            circle2.Position = new Vector2(-1.5f * size.X / 5, -size.Y / 10);
			circle3.Position = new Vector2(-0.4f * size.X / 5, -size.Y / 10);

			head = body.CreateFixture(circle1);
			hands[0] = body.CreateFixture(circle2);
			hands[1] = body.CreateFixture(circle3);

			head.UserData = (int)10000;
			hands[0].UserData = (int)11000;
			hands[1].UserData = (int)11000;

			image.LoadContent(content, "Graphics/tezka", Color.White, position);

			image.ScaleToMeters(size);

			image.position = ConvertUnits.ToDisplayUnits(body.Position);
		}

 public DebrisComponent(Fixture fixture, int timeToLive, float restitutionIncrement)
 {
     _fixture = fixture;
     _timeToLive = timeToLive;
     _restitutionIncrement = restitutionIncrement;
     _restitutionCount = 0;
 }

			public ColEvent(EventType type, Fixture fxA, Fixture fxB, CollisionData data)
			{
				this.Type = type;
				this.FixtureA = fxA;
				this.FixtureB = fxB;
				this.Data = data;
			}

 public override void OnCollisionExit(Fixture fixtureA, Fixture fixtureB)
 {
     //Is the CameraObject for the X or Y axis?
     if (this.height > this.width) // It is for the X axis
     {
         //Check which side the player is leaving
         if (fixtureB.Body.Position.X < fixtureA.Body.Position.X && fixtureB.Body.LinearVelocity.X < 0) //Player is moving to the left
         {
             if (this.unlockDirection == UnlockWhenPlayerMovesLeft)
             {
                 this.UnlockCameraHorizontally();
             }
             else
             {
                 this.LockCameraHorizontally();
             }
         }
         else if (fixtureB.Body.Position.X > fixtureA.Body.Position.X && fixtureB.Body.LinearVelocity.X > 0) //Player is moving to the right
         {
             if (this.unlockDirection == UnlockWhenPlayerMovesRight)
             {
                 this.UnlockCameraHorizontally();
             }
             else
             {
                 this.LockCameraHorizontally();
             }
         }
     }
     else //It is for the Y axis
     {
     }
 }