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Chances are, whatever it is that interests you about Robosapien will be covered in this book. We ll examine everything from the basics to more advanced topics. My hope is to give you not only an advanced user guide to Robosapien, but also some background information about the theories behind the machine, and to explore the ways to go beyond what comes in the box using Robosapien as a platform for hacks or modifications. Finally, we ll sneak a peek at the new line of Robosapiens due out in 2005 including Robopet, Roboraptor, and the bipedal Robosapien V2. That s a tall order, but I hope at the very least I can provide you with enough information to aid further, more detailed investigation on your own to whet your curiosity, as they say. Or even better, to spark your creativity to come up with your own ways to use Robosapien. Curiosity and creativity. These are two words that define my relationship with this funny little robot. In this chapter, I take a look at Robosapien. What exactly is it What can it do To close out 1, I ll discuss in more detail what I hope to accomplish with this book, and what you, the reader, will need to get the most out of The Robosapien Companion.

Obviously, it must be possible for Fishpod to change states as well, but the conditions for doing so also depend on the current state; so pressing the left arrow should change Fishpod into the walking state from the standing state, but not from the falling state. Figure 2 9 shows these five states and the relationships between them, with each arrow representing a different potential path for changing states.

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Strictly speaking, Robosapien is a battery-operated, remote-controlled robotic toy. Standing 14 inches at the shoulder, and weighing in at 4.8 pounds (including batteries), Robosapien takes up about the same amount of space as a small house cat. Robosapien uses four D cell batteries, which go into compartments accessed at the bottom of its feet, and the 21-key remote control uses three AAA batteries. There is a lot more to Robosapien than first meets the eye, particularly from a technical and design standpoint, and we ll examine some of these topics in more detail throughout the rest of the book. But first, we need to figure out exactly what Robosapien is. Is Robosapien a robot, or is it a toy

Figure 2 9 A (finite) state machine diagram for the Fishpod character Collision refers to a collision between Fishpod and a platform, unless otherwise specified Supported/not supported refers to whether Fishpod has a platform directly below him or not Note that the two blue arrows are the only state transitions directly controlled by the player by pressing keys If you read our previous book, then you ll know that it s possible to represent different states like this by creating separate objects for each state and using the Change Instance action to switch between them when required Change Instance turns an instance of one type of object into another while keeping the same position, direction, and speed or any other individual properties of the instance.

We ll see how this works in practice a bit later, but first we need to consider the additional complication created by the different directions the character can be facing Although we have shown five states in our state machine, there will actually be ten states in this game, as each of the five states can either be facing left or right We could easily go ahead and create different left and right objects for each state, but this would seem to over-complicate the situation, and the whole point of a state machine is to make things easier Instead, we will use a variable to keep track of which direction the character is facing, using a value of 1 for facing left and a value of 2 for facing right.

Figure 1-1. Essential phases in application development If you think carefully about the tasks to carry out for each of these phases, you may notice that performance is inherent to each of them. In spite of this, real development teams quite often forget about performance, at least until performance problems arise. At this point, it may be too late. Therefore, in the following sections, I ll cover what you should not forget, from a performance point of view, the next time you are developing an application.

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