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the servlet will be loaded. You will therefore need to give the context loader servlet a loadon-startup value of 1, as shown in Listing 6-3. Any other servlets using Spring technologies must be given a higher load-on-startup value. The context loader servlet uses the same default configuration file as the listener, and can use the same context-param entry to override this default.

else if (keyboardMap != null) { Keys key = keyboardMap[button]; pressed = (keyboardState.IsKeyDown(key) && lastKeyboardState.IsKeyUp(key)); } return pressed; }

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Other daughter contexts may well be managed by other components. For example, when using a Spring MVC dispatcher servlet, it will create its own private application context. The application context managed by the context loader listener or servlet is the only context that is visible to all other contexts. Other contexts are not necessarily visible to each other, and beans created in these contexts are not necessarily visible to beans created in the main application context.

You can use the IsKeyPressed and IsKeyJustPressed methods that you created for the InputHelper class to check whether a digital key is pressed or not. But if you try to use these methods to retrieve the state of the thumbsticks and triggers of the Xbox 360 gamepad, you ll just get a Boolean result, indicating whether the buttons are pressed or not. For thumbsticks, you need a more granular result in order to take full advantage of them and create the illusion of smooth motion. In the XNA GamePadState class, the position of each thumbstick of the Xbox 360 controller is retrieved as a Vector2 object, and the triggers state as a float value. In your InputHelper class, you ll create some methods to retrieve the state of the gamepad s thumbsticks in the same way it s done in the GamePadState class. Notice that you also need to properly handle the keyboard keys that are mapped to the thumbsticks. Following is the code for the GetLeftThumbStick method of the InputHelper class, used to retrieve the position of the gamepad s left thumbstick: public Vector2 GetLeftThumbStick() { Vector2 thumbPosition = Vector2.Zero; if (gamePadState.IsConnected) thumbPosition = gamePadState.ThumbSticks.Left; else if (keyboardMap != null) { if (keyboardState.IsKeyDown( keyboardMap[Buttons.LeftThumbstickUp])) thumbPosition.Y = 1; else if (keyboardState.IsKeyDown( keyboardMap[Buttons.LeftThumbstickDown])) thumbPosition.Y = -1; if (keyboardState.IsKeyDown( keyboardMap[Buttons.LeftThumbstickRight])) thumbPosition.X = 1; else if (keyboardState.IsKeyDown( keyboardMap[Buttons.LeftThumbstickLeft])) thumbPosition.X = -1; } return thumbPosition; }

The Spring MVC framework is a powerful environment within which to create clean, decoupled web applications. There is excellent support for simple tasks such as handling form submission and rendering content in multiple output formats. The key components of the framework are controller classes to make decisions and invoke business logic, command beans to represent form and request parameters, and view resolvers to render the contents of the command beans and reference data supplied by the controllers.

In the GetLeftThumbStick method, you take the same approach you did in the IsKeyPressed method: you first check if the gamepad is connected, and if so, you just return the desired value. Otherwise, you check the state of the keyboard keys that are mapped to the left thumbstick (up, down, left, and right) and return a Vector2 containing the resulting thumbstick position. In addition to the GetLeftThumbStick method, you also need to create the GetRightThumbStick method to retrieve the position of the gamepad s right thumbstick. Following is the code for the GetRightThumbStick method: public Vector2 GetRightThumbStick() { Vector2 thumbPosition = Vector2.Zero; if (gamePadState.IsConnected) thumbPosition = gamePadState.ThumbSticks.Right; else if (keyboardMap != null) { if (keyboardState.IsKeyDown( keyboardMap[Buttons.RightThumbstickUp])) thumbPosition.Y = 1; else if (keyboardState.IsKeyDown( keyboardMap[Buttons.RightThumbstickDown])) thumbPosition.Y = -1; if (keyboardState.IsKeyDown( keyboardMap[Buttons.RightThumbstickRight])) thumbPosition.X = 1; else if (keyboardState.IsKeyDown( keyboardMap[Buttons.RightThumbstickLeft])) thumbPosition.X = -1; } return thumbPosition; }

Because Spring MVC runs as a standard Java EE web application, the entry point to the framework is a Java EE servlet. This servlet dispatches incoming web requests to a URL mapping bean, which in turn determines which Spring controller will handle the request. Listing 6-4 shows the configuration of a suitable dispatcher servlet.

Another very interesting parameter of the Begin method is transformMatrix, which receives a transformation matrix that will apply transformations (scale, rotation, or translation) to the entire batch of sprites being drawn. You will learn more about matrices in 8. Running the program now results in a window with the sprite sitting in the upper-left corner the (0, 0) position of the program window as shown in Figure 2-5.