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The update/draw loop that XNA employs is generally very good for presenting a game to the screen and offers great opportunities for rich-looking graphic updates. But sometimes the graphics being drawn to the screen aren t actually moving at all. XNA is unaware of this, however, and continues to clear and repaint the same identical scene frame after frame, using the CPU and graphics hardware in the process and wasting the battery as a result. These is, however, a way to indicate to XNA that it doesn t need to redraw the screen and can just re-present the most recently drawn screen. This is achieved simply by calling the Game class s SuppressDraw method from within the Update function. A simple approach to managing this is to create a bool variable within Update called objectsMoved, initially set to false. As soon as your Update code causes anything to happen that needs the screen to be redrawn, it sets this variable to true. At the end of the function, the code can then check this variable and call SuppressDraw if it still contains its initial false value.

setLeftStick() is a typical method (it creates a GrabberOp object for affecting the grabber s left arm): private void setLeftStick(int dir) /* Deal with input from the gamepad's left stick The left stick maps to the left grabber */ { partVal = LEFT_GRABBER; if (dir == GamePadControllerNORTH) { // y up opVal = LEFT_Y_POS; jointVal = Y_JOINT; rotVal = POS; } else if (dir == GamePadControllerSOUTH) { // y down opVal = LEFT_Y_NEG; jointVal = Y_JOINT; rotVal = NEG; } else if (dir == GamePadControllerEAST) { // x right opVal = LEFT_X_NEG; jointVal = X_JOINT; rotVal = NEG; } else if (dir == GamePadControllerWEST) { // x left opVal = LEFT_X_POS; jointVal = X_JOINT; rotVal = POS; } } // end of setLeftStick() Each arm has four joints (x-, y-, z-, and the fingers), and each joint can be rotated in a positive or negative direction.

When describing a transaction, the entire boundary of the transaction is referred to as the transaction wrapper. The transaction wrapper contains all the instructions that you want the database server to view as a single atomic unit. In order to inform your database server that a group of statements are intended to be viewed as a single transaction, you need a method of indicating to the server when a transaction begins and ends. These indicating marks are called demarcation, which defines the boundary of the transaction wrapper. In MySQL, the demarcation of transactions is indicated through the commands START TRANSACTION and COMMIT. When a START TRANSACTION command is received, the server creates a transaction wrapper for the connection and puts incoming statements into the transaction wrapper until it receives a COMMIT statement marking the end of the transaction.2 The database server can rely on the boundary of the transaction wrapper, and it views all internal statements as a single unit to be executed entirely or not at all.

In this chapter, we have covered a lot of XNA s capabilities for 2D rendering. In the next chapter, we will build on these capabilities and start to develop a model for flexible game development. Please feel free to spend some time experimenting with what you have learned so far. You already have lots of useful and flexible graphical techniques under your belt, and the more familiar and comfortable you can get with these the better. Try out using some of these effects and see what you can produce yourself.

TRANSACTION command marks the start of a transaction. If you are using a version of MySQL before 4.0.11, you can use the older, deprecated command BEGIN or BEGIN WORK.

For instance, if the user presses the left stick upward (which is denoted by GamePadControllerNORTH), the arm s y-axis joint should be rotated in a positive direction to move it up The GrabberOp states are set to the following:.

We have covered a lot of the technology foundations so far, and you have a good understanding of the functions required for displaying 2D content to the screen. Now it is time to start organizing and structuring what you have learned. It would be very easy to launch into our first game at this point, but instead of diving straight in, we will take a rather more planned approach. In this chapter, we will begin the creation of a game framework, an object structure that we will build upon when writing games. The framework will be able to simplify the code that we write for each game, speeding up development time and allowing us to focus on the game rather than getting caught up in fiddly technical details. We can address all these details in the framework just once and then we don t have to worry about them when we are developing.