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

Sometimes the output of your application will not be intended for presentation as HTML, but will instead be generated as a PDF, a Microsoft Word document, or an XML file. In these cases, we need to resort to code to generate the contents of the view. In fact, we need to define our own view type. Spring views are just classes that implement the View interface, shown in Listing 6-33.

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To do that, you create a vector from the enemy s position to its destination and use the length of this vector to check the distance between them If the distance is below a defined epsilon value (for example, 100), the enemy has reached its destination, and a new destination must be generated: // Calculate wander vector on X, Z axis Vector3 wanderVector = wanderPosition - TransformationTranslate; wanderVectorY = 00f; float wanderLength = wanderVectorLength(); // Reached the destination position if (wanderVectorLength() < DISTANCE EPSILON) { // Generate a new wander position } In the preceding code, when an enemy is created, its first destination position is equal to its start position..

public interface View { public String getContentType(); void render(Map model, HttpServletRequest request, HttpServletResponse response) throws Exception; } When a controller needs to render a page, the view resolver calls the getContentType() method to determine the content type: value to return in the HTTP request, and then calls the render method, passing in the request and response headers. The implementation class can then do anything a servlet implementation would be able to do to put information into the response object. Unless you are generating output in some particularly obscure format, you would normally override one of the standard Spring abstract view implementations provided for this purpose. There are implementations for PDF files, Microsoft Office documents, XML and XSLT output, as well as the JSP, Velocity, and FreeMarker implementations that we ve already discussed.

If the number of random movements the enemy makes is lower than the maximum number of consecutive random movements that it could make, its new destination position will be a randomly generated position. Otherwise, the next enemy destination will be its starting position. // Generate a new random position if (wanderMovesCount < WANDER MAX MOVES) { wanderPosition = Transformation.Translate + RandomHelper.GeneratePositionXZ(WANDER DISTANCE); wanderMovesCount++; } // Go back to the start position else { wanderPosition = wanderStartPosition; wanderMovesCount = 0; } // Next time wander nextActionTime = (float)time.TotalGameTime.TotalSeconds + WANDER DELAY SECONDS + WANDER DELAY SECONDS * (float)RandomHelper.RandomGenerator.NextDouble(); The enemy s random destination position is generated through the GeneratePositionXZ method of your RandomHelper class. After generating the enemy s new destination, you also generate a random time when the enemy should start moving to its new destination so that it does not appear that all the enemies are moving in unison, which would ruin the game s realism. Following is the complete code for the Wander method of the Enemy class: private void Wander(GameTime time) { // Calculate wander vector on X, Z axis Vector3 wanderVector = wanderPosition - Transformation.Translate; wanderVector.Y = 0.0f; float wanderLength = wanderVector.Length(); // Reached the destination position if (wanderLength < DISTANCE EPSILON) { SetAnimation(EnemyAnimations.Idle, false, true, false); // Generate a new random position if (wanderMovesCount < WANDER MAX MOVES) { wanderPosition = Transformation.Translate + RandomHelper.GeneratePositionXZ(WANDER DISTANCE); wanderMovesCount++; }

In general, we expect the incoming request to be passed to the controller, processed, and then passed directly to a view to be rendered either in the original form view (if an error has occurred) or in a success view of some type (if the submitted data has been processed without error). Sometimes, however, we want to pass the incoming request to some other controller to allow further processing. Spring MVC provides two special view prefixes to support this. The simplest of the two mechanisms to use is forwarding. Listing 6-34 shows the use of the forward: prefix to allow this.