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To accomplish this, an organization might define a coding standard defining how to properly store and retrieve a database connection string However, this technique will end up creating many coding rules that the development team will constantly have to remember and enforce Even with a coding rule like this in place, the application developers would still have to create the code to retrieve the connection string, and this repetitive coding would eventually become mundane and time-consuming A better way to handle these kinds of development issues is through an enterprise framework An enterprise framework builds upon the functionality available within a development environment, but it takes the most common code routines in an application and encapsulates the code into a more simplified implementation Let s reconsider the previous example, this time revising it to use a framework component: public class myLookupDataAccessClass { public ReportLookUpData GetReportLookUpData() {.

HTTP Expiration Caching Is a Bad Idea (Generally)

Also, our poor clueless bitmaps have absolutely no information to give us about the collision that happens. Because there s no mathematical information about the shapes, there s no way to find out by how much the shapes have intersected, the side of the shape where the collision happened, or the angle of the collision. These are serious problems. The performance hit alone means that bitmap collision detection should only ever be a last resort in your games. Still, it s undeniably useful for complex shapes, and it s essential in some situations. So let s see how we can make it work.

When extending Enterprise Library, especially when creating a new custom application block, it is important to try to follow the guidelines set forth by the Microsoft patterns & practices

All collision-detection systems must have a clear collision boundary. You need to know where and by how much the objects have intersected so that you can separate them and send them on their merry way. If your shapes are defined by vectors, you have detailed information that you can use to do this. s 2, 3, and 4 were proof of that. As you ve learned, bitmaps don t have any information about their content except pixel positions and colors. Without any mathematical information about the colliding shapes, how can we possibly do the kind of separation and collision reaction that we ve been doing with vectors over the past few chapters Easy we use vectors! In the chapter files, you ll find a folder called BlockMovement. Run the SWF, and you ll see something that looks very much like the previous example. But in this version, the stars don t overlap when they collide. They remain cleanly separated the entire time, no matter where you move the mouse, as shown in Figure 5-5. Here s the ENTER_FRAME loop from the BlockMovement application class that does this:

E B V N managing caching by writing code to help the Internet infrastructure do its work. The second

group These guidelines have been created by Microsoft and the industry as a whole to provide the best architectural guidance in developing software, including the application blocks themselves One of the foremost considerations in designing a new application block is extensibility, and one of the ways to ensure extensibility is by providing a public API to expose the application block s internal functionality The easiest way to expose an application block is by using interfaces or base classes to define the different possible points that an application block can be extended It is never a good idea to force an application developer to know the internals of an application (although that might be a good learning experience, it is probably more imperative for the developer to get the application coded and into production).

Figure 5-5. Use a bit of simple vector math to keep the shapes perfectly separated when they collide. private function enterFrameHandler(event:Event):void { _s1.bitmap.x = stage.mouseX - 100; _s1.bitmap.y = stage.mouseY - 100; //Distance vector between the stars var v0:VectorModel = new VectorModel ( _s1.bitmap.x, _s1.bitmap.y, _s2.bitmap.x, _s2.bitmap.y ); //Use a while loop to figure out if the stars are touching while ( _s1.bitmapData.hitTest ( new Point(_s1.bitmap.x, _s1.bitmap.y), 255, _s2.bitmap, new Point(_s2.bitmap.x, _s2.bitmap.y), 255 ) ) { //Separate _s1 by 1 unit vector until //it is no longer touching _s2 _s1.bitmap.x -= v0.dx; _s1.bitmap.y -= v0.dy; } }