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Documentation does not normally appear on the feature list of any framework, and open source tools have a mediocre reputation for their documentation. Typically, developers are more interested in writing interesting software than in explaining to the uninitiated how to take advantage of it. Spring is a breath of fresh air in this respect. The documentation for Spring itself is well written and comprehensive.

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The PutinStartPosition method puts the meteor in a random horizontal position at the top of the screen, and also obtains the vertical and horizontal displacement speed of the meteor, which each call of the class s Update method refreshes. A CheckCollision method verifies if the rectangle that delimits the meteor intersects with a rectangle passed as a parameter. This will be the rectangle that delimits the position of the player s spaceship on the screen. Now let s put the meteors on the screen. Add the following code in the Start method of the Game1 class: // Add the meteors for (int i = 0; i < STARTMETEORCOUNT; i++) { Components.Add(new Meteor(this, ref meteorTexture)); } The STARTMETEORCOUNT constant defines the initial number of meteors that will appear in the game. Declare it in the Game1 class as follows: private const int STARTMETEORCOUNT = 10; Execute the program by pressing F5. Look at the beauty of the meteor rain. Note that each instance of the Meteor component behaves in an independent way, just as the Ship component does.

The Spring Javadoc API documentation is particularly well thought out, another happy surprise for developers too used to seeing the minimum of autogenerated API references. For example, the Javadoc for the Spring MVC framework discusses the purpose of the various classes, methods, fields, and parameters in depth, but it also contains invaluable discussion of the life cycle of the controller classes. Spring is a formidable product, without doubt. Because it ties together such a diverse suite of libraries and other frameworks, it inevitably has some murky corners and contains some pitfalls for unwary novices. This book aims to address those issues and help you up the steeper part of Spring s learning curve. After you have bootstrapped a basic understanding of the design and philosophy of Spring, you will have a wealth of documentation and other resources available to you. All of the documentation for the Spring framework is available from the Spring website at http://springframework.org, and you can get help from a thriving community of other Spring users in the forums at http://forum.springframework.org.

Your game components are nearly ready. Now you need to make them work together; that is, when the player s spaceship collides with a meteor, the game will restart. So, just as you have a Start method that initializes the game components, create a method called DoGameLogic that executes the game logic itself. Right now, this method only iterates the game component list, to check if a meteor collided with the player s spaceship. If there s a collision, the meteors should be taken out of the game so that they can be re-created in their initial position. This code follows: /// <summary> /// Run the game logic /// </summary> private void DoGameLogic() { // Check collisions bool hasCollision = false; Rectangle shipRectangle = player.GetBounds(); foreach (GameComponent gc in Components) { if (gc is Meteor) { hasCollision = ((Meteor)gc).CheckCollision(shipRectangle); if (hasCollision) {