ASP.NET PDF Viewer using C#, VB/NET

Not all of the application s security can be enforced with filters. Sometimes we need to make decisions about what content to present to the user that can be determined only as the data is being acquired or as the page is being rendered. In this section, you ll look at how the application logic can be informed by the security information available through Acegi.

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base.Update(gameTime); } /// <summary> /// Draw the ship sprite /// </summary> public override void Draw(GameTime gameTime) { // Get the current sprite batch SpriteBatch sBatch = (SpriteBatch)Game.Services.GetService(typeof(SpriteBatch)); // Draw the ship sBatch.Draw(texture, position, spriteRectangle, Color.White); base.Draw(gameTime); } /// <summary> /// Get the bound rectangle of ship position in screen /// </summary> public Rectangle GetBounds() { return new Rectangle((int)position.X, (int)position.Y, SHIPWIDTH, SHIPHEIGHT); } } } Note that the Draw method does not create a SpriteBatch, as was created when you rendered the background texture. Ideally (following the batch concept), you should not keep creating and destroying SpriteBatch objects, because this jeopardizes the application s performance. You could create a global SpriteBatch and use it in your classes. However, this would create a coupling between your game components and a global attribute of a specific game (which is not desirable in object-oriented programming). XNA has an excellent solution to supply this global object and still allow you to reuse the component s code easily: the game service. You can think of a game service as a service that is available to anyone who has a reference to a Game. The idea behind it is that a component should be able to depend on certain types, or services, for its functionality. If that service isn t available, then the component can t operate correctly. In this case, the Draw method will look for an active SpriteBatch directly in the GameServices collection and use it to draw itself on the screen. Of course, you must add this SpriteBatch to GameServices. So, add the following code directly after creating the SpriteBatch in the LoadContent method of the Game1 class: // Add the SpriteBatch service Services.AddService(typeof(SpriteBatch), spriteBatch);

On a secure website, some pages will be accessible to only certain classes of users. Other pages will be generally visible, but with certain content hidden from view according to the user roles. For example, a link to the admin functionality should not be visible to the standard user, but the developer will not want to create two distinct implementations of the page just to manage this sort of trivial discrepancy. The Acegi library therefore provides a JSP tag library allowing certain bodies of content to be restricted according to the user s access roles. Listing 7-19 shows the page declaration to import the appropriate tag library.

All the GameComponent items in your game will use this SpriteBatch Let s talk a little about this class The Update method checks the keyboard and Xbox 360 gamepad to update the Position attribute and change the position of the ship on the screen In this method, you also check if the ship is inside the screen boundaries If not, the code puts the ship inside the visible area of the screen The GetBound method just returns the rectangle that has the ship boundaries in the screen You ll use this rectangle later to do collision tests with meteors Finally, the PutinStartPosition puts the ship in its initial position, centered horizontally in the bottom area of the screen This method is called when you need to put the ship in its starting position; for example, when a new round starts Now let s test this GameComponent.

Listing 7-19. Including the Acegi Tag Library into a JSP <%@taglib prefix="authz" uri="http://acegisecurity.org/authz" %>