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So here we are, about to embark on another journey into the world of game development. You may have joined us last time in The Game Maker s Apprentice: Game Development for Beginners (Apress, 2006), or perhaps you taught yourself the basics of Game Maker under your own steam. Either way, we invite you to dust off your trusty keyboard and loosen up your mouse-arm as you join us in The Game Maker s Companion. The path ahead is an exciting one and we have a host of new challenges in store to enhance your skills as a game developer. Nonetheless, it would be foolish to undertake such a journey without making suitable preparations first. Each of you will bring your own unique skills to the journey ahead, but you won t get very far without some level of background knowledge. This chapter will equip you with that knowledge, so please make sure you are familiar with it before continuing. The majority of this information was covered in our first book, so this chapter simply summarizes the important facts as a reminder. It won t take long to cover the essentials, so let s make a start. This chapter will also serve as a handy reference if you need to check back on something later on in the book.

Figure 1-1. Robosapien comes complete with remote controller, instruction manual, and a cup that it can pick up.

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oo often, tuning begins when an application s development is already finished. This is unfortunate because it implies that performance is not as important as other crucial requirements of the application. Performance is not merely optional, though; it is a key property of an application. Not only does poor performance jeopardize the acceptance of an application, it usually leads to a lower return on investment because of lower productivity. In fact, as shown in several IBM studies from the early 1980s, there is a close relationship between performance and user productivity. The studies showed a one-to-one decrease in user think time and error rates as system transaction rates increased. This was attributed to a user s loss of attention because of longer wait times. In addition, poorly performing applications lead to higher costs for software, hardware, and maintenance. For these reasons, this chapter discusses why it is important to plan performance and how to know when an application is experiencing performance problems. Then the chapter covers how to approach performance problems on a running system.

Video games are made up of different kinds of digital resources such as animations, sounds, music, and backgrounds. Game Maker lists all of its resources down the left-hand side of the main window (see Figure 1 1). These are grouped together into folders according to the different kinds of resources that Game Maker supports. You don t need to know every detail of every kind of resource, but you should be generally aware of what each type of resource is for. Sprites: Sprite resources are the digital images that you use to represent foreground objects in your games. Game Maker supports loading sprite images from .bmp, .jpg, and .gif file formats and now in Game Maker 8, .png and .gmspr as well. You can load animated images using the .gif and .gmspr formats, or by treating .png files as sequential strips of images by using _stripXX at the end of the file name (where XX = the number of frames in the image). Sounds: Sound resources include both sound effects and music for your games. Game Maker supports .wav, .mid (MIDI), and .mp3 formats, but .mp3 music can take up a lot of space and often contributes to the large size of finished games. Backgrounds: Background resources are digital images that you use to represent the background scene of your game. Backgrounds can only contain single images and Game Maker can load these images from .bmp, .jpg, .gif, and .png formats.

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