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This is where automated testing comes into the picture Automated tests allow the developer to systematically retest a particular component of an application This can be done by creating a test harness application and running a batch file, or using an automated testing framework Before the creation of automated testing frameworks, the only option was to create batch files for testing and create a custom test harness Today, automated testing frameworks provide a framework to assist in the creation and running of unit tests, and, in some cases, system tests Examples of automated testing frameworks include NUnit, CSUnit, JUnit, and so on..

It needs to be added to the stage so that we can see the game world. addChild(_backgroundBitmap); The custom drawGameObject method does the work of blitting from the tile sheet to the backgroundBitmap. It takes two parameters: a TileModel object and the destination BitmapData. drawGameObject(tileModelObject, destinationBitmapData); Remember that the TileModel class contains the coordinates of where on the tile sheet to find the correct tile. It also contains the coordinates of where on the game map the tile should be placed. This information and the name of the destination BitmapData are all we need to blit the tile. Here s the drawGameObject method that copies the tile from the tile sheet onto the correct place on the backgroundBitmap: private function drawGameObject ( tileModel:TileModel, screen:BitmapData ):void

If you are using anything else, check that the server fully understands the HTTP 11 protocol Otherwise, you will have problems with excessive network communications As an example recommendation, it you plan on using Mono, then use mod_mono with Apache, and not just XSP Although XSP (109) is a promising web server, it is not quite ready for prime time, at least at the time of this writing..

A new addition to the automated testing frameworks comes from Microsoft. This new tool comes with Visual Studio 2005 Team System, and much like NUnit, it provides a mechanism for performing automated tests, along with other features. The Microsoft patterns & practices team, in keeping with its best practices and guidance suggestions, created unit tests for Enterprise Library. In fact, the group created two sets of unit tests: one that utilizes NUnit and the other that utilizes Visual Studio 2005 Team System. This gives you the option to use either testing framework to perform your unit tests.

{ var sourceRectangle:Rectangle = new Rectangle ( tileModel.tileSheetColumn * MAX_TILE_SIZE, tileModel.tileSheetRow * MAX_TILE_SIZE, tileModel.width, tileModel.height ); var destinationPoint:Point = new Point ( tileModel.xPos, tileModel.yPos ); screen.copyPixels ( _tileSheetBitmapData, sourceRectangle, destinationPoint, null, null, true ); } As you can see, this is identical to the system we used to blit the particle explosions in 6. A Rectangle object defines where on the tile sheet the tile is located. It gets this information from the TileModel object that we initialized earlier. Notice how the x and y positions are found by multiplying the tile sheet column and row numbers by the maximum tile size. var sourceRectangle:Rectangle = new Rectangle ( tileModel.tileSheetColumn * MAX_TILE_SIZE, tileModel.tileSheetRow * MAX_TILE_SIZE, tileModel.width, tileModel.height ); Next, we find the destination point on the bitmap where we want to blit the tile. This will be whatever the TileModel object s xPos and yPos values are. var destinationPoint:Point = new Point ( tileModel.xPos, tileModel.yPos );

There is a fly in the soup of HTTP validation: when implementing the server side of a web application, there is an inconsistency. Any file that the HTTP server manages directly has entity tags. But for content managed by an external application such as Java Servlet, ASP.NET, or script,

Finally, we copy the tile onto the bitmap using the BitmapData s copyPixels method. screen.copyPixels ( _tileSheetBitmapData, sourceRectangle, destinationPoint, null, null, true ); This is an all-purpose blit method that will be used, unchanged, for the blitting we ll be doing for all the examples in this chapter and the next.

Note The Enterprise Library unit tests provided for NUnit will work only with version 2.2 and later.

All the code that we ve looked at so far in this chapter is from the Map.as application class. It forms the core of our tile-based game engine, so it s very important that you see all the code in its full context. package { import import import import import import