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The main application class, VerletSpaceShip, makes the spaceship move. Its enterFrameHandler is almost identical to our first example. The only differences are that the ship s rotation is adjusted and that the code is using the StageBoundaries.wrap method to create the stage-wrapping effect. (Take a look at com\friendsofed\StageBoundaries.as if you re curious to see how it works.) private function enterFrameHandler(event:Event):void { //1. Update the player position _spaceShip.update(); //2. Check collisions StageBoundaries.wrap(_spaceShip, stage); //3. Move the ship _spaceShip.x = _spaceShip.xPos; _spaceShip.y = _spaceShip.yPos; _spaceShip.rotation = _spaceShip.rotationValue; //4. Display the ship's velocity in the status box _status.text = "VX: " + _spaceShip.vx + " VY: " + _spaceShip.vy; } If this is the first time you ve used Verlet integration, it s probably going take a bit of mental rewiring before you feel confident using it in your own games. Now might be a good time to take a short break from this chapter and see if you can rewrite one of your favorite player control systems using this technique. It works for any moving object and, as you ll see in the chapters ahead, it will become an essential part of a stable game physics system.

The destination is what points to the Hessian server endpoint or gateway. By specifying only remoteDestination, you are implying a relative path from the SWF application path. Therefore, a SWF application at a path of the type http://domain:port/approot/MyApp.swf, wanting to access the Hessian endpoint at http://domain:port/approot/remoteDestination, would specify the destination as remoteDestination. Fully qualified URLs can also be assigned as values to the destination property. If the domain of the Hessian endpoint and the SWF are different, the Flash security restrictions apply; don t forget to put a crossdomain.xml file at the remote server root, appropriately configured as necessary. In your Flex application code, you invoke the remote methods with the configured HessianService handle. So a call to joinString would look somewhat like this:

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When a ByValue object holds references to other objects, those have to be either serializable or MarshalByRefObjects; otherwise, an exception will be thrown, indicating that those objects are not remoteable.

One of the advantages of tile-based games is their predictable symmetry. The entire game world is composed of tiles that are the same size. You can leverage those fixed sizes to help simplify your game engine. This makes game design much easier, and the end result for players is that your game looks precise with clean mechanics. In the platform game examples in the previous chapter, the cat s dimensions didn t match the tile dimensions. It could run and jump freely between tiles however it pleased. That was the effect we wanted to achieve, but we paid for it with complex physics and collision code. If you re willing to forgo some of the fancy physics and work within the limitations imposed by the underlying math of the tile-based engine, things become much simpler and possibly even better. For an example of this theory in action, take a look at the MoveAroundMaze example in the chapter s source files. It features the heroic return of Button Fairy in an underground dungeon maze, as shown in Figure 9-1. Use the arrow keys to move her around the maze.

hessianService.joinString.send(firstStringParam, secondStringParam);

A MarshalByRefObject is a remote object that runs on the server and accepts method calls from the client. Its data is stored in the server s memory and its methods executed in the server s AppDomain. Instead of passing around a variable that points to an object of this type, in reality only a pointer-like construct called an ObjRef is passed around. Contrary to common pointers, this ObjRef does not contain the memory address, rather the server name/IP address and an object identity that identifies exactly one object of the many that are probably running on the server. I cover this in depth later in this chapter. MarshalByRefObjects can be categorized into two groups: server-activated objects (SAOs) and client-activated objects (CAOs).

A call to the Hessian service is asynchronous, where the send method maps to mx.rpc.AbstractOperation.send(), so you need to use the AsyncToken and a callback handler to get the response. The callback handler can be any class that implements the mx.rpc.IResponder interface. The IResponder interface defines two methods, result and fault. On a successful result, the result callback method is invoked, and on error, the fault callback method is invoked. Very simplistically, you could do this:

Notice how Button Fairy behaves in this example: She is neatly centered within in each tile cell. She changes direction only when she s precisely centered within a cell. She moves smoothly into new corridors without catching on the corners of the walls. These features of the control system were planned to take advantage of some convenient side effects of the tile-based engine.

var token:AsyncToken = hessianService.joinString(firstStringParam, secondStringParam); token.addResponder(IResponderImplClass);

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