public override void HandleInput(InputHelper input, GameTime gameTime)
        {
            if (input.IsNewButtonPress(Buttons.B) ||
                input.IsNewMouseButtonPress(MouseButtons.RightButton) ||
                input.IsNewKeyPress(Keys.Space))
            {
                _walker.Reverse();
            }

            base.HandleInput(input, gameTime);
        }
        public override void HandleInput(InputHelper input, GameTime gameTime)
        {
            if (input.IsNewMouseButtonPress(MouseButtons.RightButton) ||
                input.IsNewButtonPress(Buttons.B))
            {
                Vector2 cursorPos = Camera.ConvertScreenToWorld(input.Cursor);

                Vector2 min = cursorPos - new Vector2(10, 10);
                Vector2 max = cursorPos + new Vector2(10, 10);

                AABB aabb = new AABB(ref min, ref max);

                World.QueryAABB(fixture =>
                                    {
                                        Vector2 fv = fixture.Body.Position - cursorPos;
                                        fv.Normalize();
                                        fv *= 40;
                                        fixture.Body.ApplyLinearImpulse(ref fv);
                                        return true;
                                    }, ref aabb);
            }

            base.HandleInput(input, gameTime);
        }
        public override void HandleInput(InputHelper input, GameTime gameTime)
        {
            // Control debug view
            if (input.IsNewButtonPress(Buttons.Start))
            {
                EnableOrDisableFlag(DebugViewFlags.Shape);
                EnableOrDisableFlag(DebugViewFlags.DebugPanel);
                EnableOrDisableFlag(DebugViewFlags.PerformanceGraph);
                EnableOrDisableFlag(DebugViewFlags.Joint);
                EnableOrDisableFlag(DebugViewFlags.ContactPoints);
                EnableOrDisableFlag(DebugViewFlags.ContactNormals);
                EnableOrDisableFlag(DebugViewFlags.Controllers);
            }

            if (input.IsNewKeyPress(Keys.F1))
            {
                EnableOrDisableFlag(DebugViewFlags.Shape);
            }
            if (input.IsNewKeyPress(Keys.F2))
            {
                EnableOrDisableFlag(DebugViewFlags.DebugPanel);
                EnableOrDisableFlag(DebugViewFlags.PerformanceGraph);
            }
            if (input.IsNewKeyPress(Keys.F3))
            {
                EnableOrDisableFlag(DebugViewFlags.Joint);
            }
            if (input.IsNewKeyPress(Keys.F4))
            {
                EnableOrDisableFlag(DebugViewFlags.ContactPoints);
                EnableOrDisableFlag(DebugViewFlags.ContactNormals);
            }
            if (input.IsNewKeyPress(Keys.F5))
            {
                EnableOrDisableFlag(DebugViewFlags.PolygonPoints);
            }
            if (input.IsNewKeyPress(Keys.F6))
            {
                EnableOrDisableFlag(DebugViewFlags.Controllers);
            }
            if (input.IsNewKeyPress(Keys.F7))
            {
                EnableOrDisableFlag(DebugViewFlags.CenterOfMass);
            }
            if (input.IsNewKeyPress(Keys.F8))
            {
                EnableOrDisableFlag(DebugViewFlags.AABB);
            }

            if (input.IsNewButtonPress(Buttons.Back) || input.IsNewKeyPress(Keys.Escape))
            {
                ExitScreen();
            }

            if (HasCursor)
            {
                HandleCursor(input);
            }

            if (_userAgent != null)
            {
                HandleUserAgent(input);
            }

            if (EnableCameraControl)
            {
                HandleCamera(input, gameTime);
            }

            base.HandleInput(input, gameTime);
        }
        private void HandleCursor(InputHelper input)
        {
            Vector2 position = Camera.ConvertScreenToWorld(input.Cursor);

            if ((input.IsNewButtonPress(Buttons.A) ||
                 input.IsNewMouseButtonPress(MouseButtons.LeftButton)) &&
                _fixedMouseJoint == null)
            {
                Fixture savedFixture = World.TestPoint(position);
                if (savedFixture != null)
                {
                    Body body = savedFixture.Body;
                    _fixedMouseJoint = new FixedMouseJoint(body, position);
                    _fixedMouseJoint.MaxForce = 1000.0f * body.Mass;
                    World.AddJoint(_fixedMouseJoint);
                    body.Awake = true;
                }
            }

            if ((input.IsNewButtonRelease(Buttons.A) ||
                 input.IsNewMouseButtonRelease(MouseButtons.LeftButton)) &&
                _fixedMouseJoint != null)
            {
                World.RemoveJoint(_fixedMouseJoint);
                _fixedMouseJoint = null;
            }

            if (_fixedMouseJoint != null)
            {
                _fixedMouseJoint.WorldAnchorB = position;
            }
        }