C# Body.CreateFixture方法代码示例

        public Breakable()
        {
            // Ground body
            {
                BodyDef bd = new BodyDef();
                Body ground = _world.CreateBody(bd);

                PolygonShape shape = new PolygonShape();
                shape.SetAsEdge(new Vector2(-40.0f, 0.0f), new Vector2(40.0f, 0.0f));
                ground.CreateFixture(shape, 0.0f);
            }

            // Breakable dynamic body
            {
                BodyDef bd = new BodyDef();
                bd.type = BodyType.Dynamic;
                bd.position = new Vector2(0.0f, 40.0f);
                bd.angle = 0.25f * Settings.b2_pi;
                _body1 = _world.CreateBody(bd);

                _shape1 = new PolygonShape();
                _shape1.SetAsBox(0.5f, 0.5f, new Vector2(-0.5f, 0.0f), 0.0f);
                _piece1 = _body1.CreateFixture(_shape1, 1.0f);

                _shape2 = new PolygonShape();
                _shape2.SetAsBox(0.5f, 0.5f, new Vector2(0.5f, 0.0f), 0.0f);
                _piece2 = _body1.CreateFixture(_shape2, 1.0f);
            }

            _break = false;
            _broke = false;
        }

        public ContinuousTest()
        {
            {
            BodyDef bd = new BodyDef();
            bd.position = new Vector2(0.0f, 0.0f);
            Body body = _world.CreateBody(bd);

            PolygonShape shape = new PolygonShape();

            shape.SetAsEdge(new Vector2(-10.0f, 0.0f), new Vector2(10.0f, 0.0f));
            body.CreateFixture(shape, 1.0f);

            shape.SetAsBox(0.2f, 1.0f, new Vector2(0.5f, 1.0f), 0.0f);
            body.CreateFixture(shape, 1.0f);
            }

            #if true
            {
            BodyDef bd = new BodyDef();
            bd.type = BodyType.Dynamic;
            bd.position = new Vector2(0.0f, 20.0f);
            //bd.angle = 0.1f;

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

            _body = _world.CreateBody(bd);
            _body.CreateFixture(shape, 1.0f);

            Launch();
            }
            #else
            {
            BodyDef bd = new BodyDef();
            bd.type = BodyType.Dynamic;
            bd.position = new Vector2(0.0f, 0.5f);
            Body body = _world.CreateBody(bd);

            CircleShape shape = new CircleShape();
            shape._p = new Vector2Zero();
            shape._radius = 0.5f;
            body.CreateFixture(shape, 1.0f);

            //bd.bullet = true;
            bd.position = new Vector2(0.0f, 10.0f);
            body = _world.CreateBody(bd);
            body.CreateFixture(shape, 1.0f);
            body.SetLinearVelocity(new Vector2(0.0f, -100.0f));
            }
            #endif
        }

        public ShapeEditing()
        {
            {
                BodyDef bd = new BodyDef();
                Body ground = _world.CreateBody(bd);

                PolygonShape shape = new PolygonShape();
                shape.SetAsEdge(new Vector2(-40.0f, 0.0f), new Vector2(40.0f, 0.0f));
                ground.CreateFixture(shape, 0.0f);
            }

            BodyDef bodydef = new BodyDef();
            bodydef.type = BodyType.Dynamic;
            bodydef.position = new Vector2(0.0f, 10.0f);
            _body = _world.CreateBody(bodydef);

            PolygonShape shape2 = new PolygonShape();
            shape2.SetAsBox(4.0f, 4.0f, new Vector2(0.0f, 0.0f), 0.0f);
            _fixture1 = _body.CreateFixture(shape2, 10.0f);

            _fixture2 = null;
        }

        public override void Step(Framework.Settings settings)
        {
            base.Step(settings);

            _debugDraw.DrawString(50, _textLine, "Press: (,) to launch a bullet.");

            if (_stepCount == 300)
            {
                if (_bullet != null)
                {
                    _world.DestroyBody(_bullet);
                    _bullet = null;
                }

                {
                    CircleShape shape = new CircleShape();
                    shape._radius = 0.25f;

                    FixtureDef fd = new FixtureDef();
                    fd.shape = shape;
                    fd.density = 20.0f;
                    fd.restitution = 0.05f;

                    BodyDef bd = new BodyDef();
                    bd.type = BodyType.Dynamic;
                    bd.bullet = true;
                    bd.position = new Vector2(-31.0f, 5.0f);

                    _bullet = _world.CreateBody(bd);
                    _bullet.CreateFixture(fd);

                    _bullet.SetLinearVelocity(new Vector2(400.0f, 0.0f));
                }
            }

            _textLine += 15;
        }

        public override void Keyboard(KeyboardState state, KeyboardState oldState)
        {
            if (state.IsKeyDown(Keys.OemComma) && oldState.IsKeyUp(Keys.OemComma))
            {
                if (_bullet != null)
                {
                    _world.DestroyBody(_bullet);
                    _bullet = null;
                }

                {
                    CircleShape shape = new CircleShape();
                    shape._radius = 0.25f;

                    FixtureDef fd = new FixtureDef();
                    fd.shape = shape;
                    fd.density = 20.0f;
                    fd.restitution = 0.05f;

                    BodyDef bd = new BodyDef();
                    bd.type = BodyType.Dynamic;
                    bd.bullet = true;
                    bd.position = new Vector2(-31.0f, 5.0f);

                    _bullet = _world.CreateBody(bd);
                    _bullet.CreateFixture(fd);

                    _bullet.SetLinearVelocity(new Vector2(400.0f, 0.0f));
                }
            }
        }

        TheoJansen()
        {
            _offset = new Vector2(0.0f, 8.0f);
            _motorSpeed = 2.0f;
            _motorOn = true;
            Vector2 pivot = new Vector2(0.0f, 0.8f);

            // Ground
            {
                BodyDef bd = new BodyDef();
                Body ground = _world.CreateBody(bd);

                PolygonShape shape = new PolygonShape();
                shape.SetAsEdge(new Vector2(-50.0f, 0.0f), new Vector2(50.0f, 0.0f));
                ground.CreateFixture(shape, 0.0f);

                shape.SetAsEdge(new Vector2(-50.0f, 0.0f), new Vector2(-50.0f, 10.0f));
                ground.CreateFixture(shape, 0.0f);

                shape.SetAsEdge(new Vector2(50.0f, 0.0f), new Vector2(50.0f, 10.0f));
                ground.CreateFixture(shape, 0.0f);
            }

            // Balls
            for (int i = 0; i < 40; ++i)
            {
                CircleShape shape = new CircleShape();
                shape._radius = 0.25f;

                BodyDef bd = new BodyDef();
                bd.type = BodyType.Dynamic;
                bd.position = new Vector2(-40.0f + 2.0f * i, 0.5f);

                Body body = _world.CreateBody(bd);
                body.CreateFixture(shape, 1.0f);
            }

            // Chassis
            {
                PolygonShape shape = new PolygonShape();
                shape.SetAsBox(2.5f, 1.0f);

                FixtureDef sd = new FixtureDef();
                sd.density = 1.0f;
                sd.shape = shape;
                sd.filter.groupIndex = -1;
                BodyDef bd = new BodyDef();
                bd.type = BodyType.Dynamic;
                bd.position = pivot + _offset;
                _chassis = _world.CreateBody(bd);
                _chassis.CreateFixture(sd);
            }

            {
                CircleShape shape = new CircleShape();
                shape._radius = 1.6f;

                FixtureDef sd = new FixtureDef();
                sd.density = 1.0f;
                sd.shape = shape;
                sd.filter.groupIndex = -1;
                BodyDef bd = new BodyDef();
                bd.type = BodyType.Dynamic;
                bd.position = pivot + _offset;
                _wheel = _world.CreateBody(bd);
                _wheel.CreateFixture(sd);
            }

            {
                RevoluteJointDef jd = new RevoluteJointDef();
                jd.Initialize(_wheel, _chassis, pivot + _offset);
                jd.collideConnected = false;
                jd.motorSpeed = _motorSpeed;
                jd.maxMotorTorque = 400.0f;
                jd.enableMotor = _motorOn;
                _motorJoint = (RevoluteJoint)_world.CreateJoint(jd);
            }

            Vector2 wheelAnchor;

            wheelAnchor = pivot + new Vector2(0.0f, -0.8f);

            CreateLeg(-1.0f, wheelAnchor);
            CreateLeg(1.0f, wheelAnchor);

            _wheel.SetTransform(_wheel.GetPosition(), 120.0f * (float)Settings.b2_pi / 180.0f);
            CreateLeg(-1.0f, wheelAnchor);
            CreateLeg(1.0f, wheelAnchor);

            _wheel.SetTransform(_wheel.GetPosition(), -120.0f * (float)Settings.b2_pi / 180.0f);
            CreateLeg(-1.0f, wheelAnchor);
            CreateLeg(1.0f, wheelAnchor);
        }

        public BodyTypes()
        {
            Body ground = null;
            {
                BodyDef bd = new BodyDef();
                ground = _world.CreateBody(bd);

                PolygonShape shape = new PolygonShape();
                shape.SetAsEdge(new Vector2(-20.0f, 0.0f), new Vector2(20.0f, 0.0f));

                FixtureDef fd = new FixtureDef();
                fd.shape = shape;

                ground.CreateFixture(fd);
            }

            // Define attachment
            {
                BodyDef bd = new BodyDef();
                bd.type = BodyType.Dynamic;
                bd.position = new Vector2(0.0f, 3.0f);
                _attachment = _world.CreateBody(bd);

                PolygonShape shape = new PolygonShape();
                shape.SetAsBox(0.5f, 2.0f);
                _attachment.CreateFixture(shape, 2.0f);
            }

            // Define platform
            {
                BodyDef bd = new BodyDef();
                bd.type = BodyType.Dynamic;
                bd.position = new Vector2(-4.0f, 5.0f);
                _platform = _world.CreateBody(bd);

                PolygonShape shape = new PolygonShape();
                shape.SetAsBox(0.5f, 4.0f, new Vector2(4.0f, 0.0f), 0.5f * (float)Math.PI);

                FixtureDef fd = new FixtureDef();
                fd.shape = shape;
                fd.friction = 0.6f;
                fd.density = 2.0f;
                _platform.CreateFixture(fd);

                RevoluteJointDef rjd = new RevoluteJointDef();
                rjd.Initialize(_attachment, _platform, new Vector2(0.0f, 5.0f));
                rjd.maxMotorTorque = 50.0f;
                rjd.enableMotor = true;
                _world.CreateJoint(rjd);

                PrismaticJointDef pjd = new PrismaticJointDef();
                pjd.Initialize(ground, _platform, new Vector2(0.0f, 5.0f), new Vector2(1.0f, 0.0f));

                pjd.maxMotorForce = 1000.0f;
                pjd.enableMotor = true;
                pjd.lowerTranslation = -10.0f;
                pjd.upperTranslation = 10.0f;
                pjd.enableLimit = true;

                _world.CreateJoint(pjd);

                _speed = 3.0f;
            }

            // Create a payload
            {
                BodyDef bd = new BodyDef();
                bd.type = BodyType.Dynamic;
                bd.position = new Vector2(0.0f, 8.0f);
                Body body = _world.CreateBody(bd);

                PolygonShape shape = new PolygonShape();
                shape.SetAsBox(0.75f, 0.75f);

                FixtureDef fd = new FixtureDef();
                fd.shape = shape;
                fd.friction = 0.6f;
                fd.density = 2.0f;

                body.CreateFixture(fd);
            }
        }

        public ApplyForce()
        {
            _world.Gravity = new Vector2(0.0f, 0.0f);

            const float k_restitution = 0.4f;

            Body ground;
            {
                BodyDef bd = new BodyDef();
                bd.position = new Vector2(0.0f, 20.0f);
                ground = _world.CreateBody(bd);

                PolygonShape shape = new PolygonShape();

                FixtureDef sd = new FixtureDef();
                sd.shape = shape;
                sd.density = 0.0f;
                sd.restitution = k_restitution;

                // Left vertical
                shape.SetAsEdge(new Vector2(-20.0f, -20.0f), new Vector2(-20.0f, 20.0f));
                ground.CreateFixture(sd);

                // Right vertical
                shape.SetAsEdge(new Vector2(20.0f, -20.0f), new Vector2(20.0f, 20.0f));
                ground.CreateFixture(sd);

                // Top horizontal
                shape.SetAsEdge(new Vector2(-20.0f, 20.0f), new Vector2(20.0f, 20.0f));
                ground.CreateFixture(sd);

                // Bottom horizontal
                shape.SetAsEdge(new Vector2(-20.0f, -20.0f), new Vector2(20.0f, -20.0f));
                ground.CreateFixture(sd);
            }

            {
                Transform xf1 = new Transform();
                xf1.R.Set(0.3524f * (float)Settings.b2_pi);
                xf1.Position = MathUtils.Multiply(ref xf1.R, new Vector2(1.0f, 0.0f));

                Vector2[] vertices = new Vector2[3];
                vertices[0] = MathUtils.Multiply(ref xf1, new Vector2(-1.0f, 0.0f));
                vertices[1] = MathUtils.Multiply(ref xf1, new Vector2(1.0f, 0.0f));
                vertices[2] = MathUtils.Multiply(ref xf1, new Vector2(0.0f, 0.5f));

                PolygonShape poly1 = new PolygonShape();
                poly1.Set(vertices, 3);

                FixtureDef sd1 = new FixtureDef();
                sd1.shape = poly1;
                sd1.density = 4.0f;

                Transform xf2 = new Transform();
                xf2.R.Set(-0.3524f * (float)Settings.b2_pi);
                xf2.Position = MathUtils.Multiply(ref xf2.R, new Vector2(-1.0f, 0.0f));

                vertices[0] = MathUtils.Multiply(ref xf2, new Vector2(-1.0f, 0.0f));
                vertices[1] = MathUtils.Multiply(ref xf2, new Vector2(1.0f, 0.0f));
                vertices[2] = MathUtils.Multiply(ref xf2, new Vector2(0.0f, 0.5f));

                PolygonShape poly2 = new PolygonShape();
                poly2.Set(vertices, 3);

                FixtureDef sd2 = new FixtureDef();
                sd2.shape = poly2;
                sd2.density = 2.0f;

                BodyDef bd = new BodyDef();
                bd.type = BodyType.Dynamic;
                bd.angularDamping = 5.0f;
                bd.linearDamping = 0.1f;

                bd.position = new Vector2(0.0f, 2.0f);
                bd.angle = (float)Settings.b2_pi;
                bd.allowSleep = false;
                _body = _world.CreateBody(bd);
                _body.CreateFixture(sd1);
                _body.CreateFixture(sd2);
            }

            {
                PolygonShape shape = new PolygonShape();
                shape.SetAsBox(0.5f, 0.5f);

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

                for (int i = 0; i < 10; ++i)
                {
                    BodyDef bd = new BodyDef();
                    bd.type = BodyType.Dynamic;

                    bd.position = new Vector2(0.0f, 5.0f + 1.54f * i);
                    Body body = _world.CreateBody(bd);

                    body.CreateFixture(fd);

//.........这里部分代码省略.........

        /// <summary>
        /// Call this to initialize a Behaviour with data supplied in a file.
        /// </summary>
        /// <param name="fileName">The file to load from.</param>
        public override void LoadContent(String fileName)
        {
            base.LoadContent(fileName);

            Int32[] input = { 1, 7, 2, 2, 3, /**/ 15, 16, 14, 16, 17 };
            mMapData = new List<Int32>(input);

            TileMapRenderDefinition def = GameObjectManager.pInstance.pContentManager.Load<TileMapRenderDefinition>(fileName);

            mTexture = GameObjectManager.pInstance.pContentManager.Load<Texture2D>(def.mSpriteFileName);

            mSourceWidth = 16;
            mSourceHeight = 16;

            mMapCountWidth = mTexture.Width / mSourceWidth;
            mMapCountHeight = mTexture.Height / mSourceHeight;

            var shape = new PolygonShape();
            shape.SetAsBox(PhysicsManager.pInstance.ScreenToPhysicalWorld(mSourceWidth / 2 * 5),
                           PhysicsManager.pInstance.ScreenToPhysicalWorld(mSourceHeight / 2 * 2));

            var fd = new FixtureDef();
            fd.shape = shape;
            fd.restitution = 0.0f;
            fd.friction = 0.5f;
            fd.density = 0.0f;

            BodyDef bd = new BodyDef();
            mGround = PhysicsManager.pInstance.pWorld.CreateBody(bd);
            mGround.CreateFixture(fd);

            shape.SetAsBox(PhysicsManager.pInstance.ScreenToPhysicalWorld(mSourceWidth / 2 * 5),
                           PhysicsManager.pInstance.ScreenToPhysicalWorld(mSourceHeight / 2 * 2),
                           PhysicsManager.pInstance.ScreenToPhysicalWorld(new Vector2(mSourceWidth * -5, 0.0f)),
                           0.0f);
            fd = new FixtureDef();
            fd.shape = shape;
            fd.restitution = 0.0f;
            fd.friction = 0.5f;
            fd.density = 0.0f;
            mGround.CreateFixture(fd);

        }

        public void LaunchBomb(Vector2 position, Vector2 velocity)
        {
            if (_bomb != null)
            {
                _world.DestroyBody(_bomb);
                _bomb = null;
            }

            BodyDef bd = new BodyDef();
            bd.type = BodyType.Dynamic;
            bd.position = position;

            bd.bullet = true;
            _bomb = _world.CreateBody(bd);
            _bomb.SetLinearVelocity(velocity);

            CircleShape circle = new CircleShape();
            circle._radius = 0.3f;

            FixtureDef fd = new FixtureDef();
            fd.shape = circle;
            fd.density = 20.0f;
            fd.restitution = 0.0f;

            Vector2 minV = position - new Vector2(0.3f,0.3f);
            Vector2 maxV = position + new Vector2(0.3f,0.3f);

            AABB aabb;
            aabb.lowerBound = minV;
            aabb.upperBound = maxV;

            _bomb.CreateFixture(fd);
        }