.NET/Java PDF, Tiff, Barcode SDK Library

float nextActionTime; Following is the code for the AttackPlayer method: private void AttackPlayer(GameTime time) { float elapsedTimeSeconds = (float)time.TotalGameTime.TotalSeconds; if (elapsedTimeSeconds > nextActionTime) { // Set attacking animation SetAnimation(EnemyAnimations.Bite, false, true, false); // Next attack time player.ReceiveDamage(attackDamage); nextActionTime = elapsedTimeSeconds + ATTACK DELAY SECONDS; } }

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Here the view actually causes a browser redirect response to be generated and sent back to the client s browser. The browser will then reload the path specified in the view name after the redirect: prefix. Model objects and any nonstring attribute objects in the request will be converted to GET string parameters. This mechanism is usually used to provide the browser with a new view immediately following a POST form submission, so that browser reloads will not cause the POST form data to be sent multiple times.

At this point, you have created all the game engine classes, helper classes, and almost all the game logic classes. Now you need to create a class to control the main game logic, and some classes to store and create the game levels. You also need to create the main game class that extends the XNA Game class. You ll create all these classes in the following sections.

There is nothing to stop you from creating the HTML in your page views from scratch, or using HTML authoring tools, but Spring provides a set of custom tag libraries allowing you to generate some of the form and other page contents more conveniently. The major tag libraries are a generic library for page content that is usually prefixed with spring and an additional form-specific tag that is therefore usually prefixed with form. When a form has failed validation, the errors information associated with the validation failure will be placed into the request context. Accessing the appropriate error information for the field or form in question can be fiddly; the tags make this simple. Repopulating (or initializing) a form s field values with data from the request can be tedious; again, the custom tags simplify this. Finally, the radio and check box fields are awkward to use correctly in any application (because the values they represent are submitted only when they are selected); the use of tags simplifies the handling of this also. Listing 6-36 shows the appropriate taglib declaration for a JSP view implementation that will be using the Spring custom tags. This is the declaration used in the implementation of the view shown in Listing 6-27, where a custom form tag is used.

Each game level is composed of a fixed set of objects: cameras, lights, a terrain, a skydome, a player, and enemies. For the game levels, create a structure named GameLevel inside the GameLogic namespace. Following is the code for the GameLevel struct: public struct GameLevel { // Cameras, lights, terrain, and sky public CameraManager CameraManager; public LightManager LightManager; public Terrain Terrain; public SkyDome SkyDome; // Player and enemies public Player Player; public List<Enemy> EnemyList; } In the XNA TPS game, you create the game levels inside the game code, instead of loading them from a file. To do that, create a static class named LevelCreator in the GameLogic namespace. The LevelCreator class is responsible for constructing the game levels and returning a GameLevel structure with the constructed level.

<%@taglib prefix="spring" uri="http://www.springframework.org/tags"%> <%@taglib prefix="form" uri="http://www.springframework.org/tags/form"%> The custom form tags are parameterized for all of the properties that are available to the corresponding well-formed HTML form elements. (When standard attribute names cannot be used in the custom tag because of Java naming conflicts, suitable renamed versions are provided for example, cssClass in place of class.) The properties all take sensible default values, so that as Listing 6-27 shows, a form defined by using Spring s custom tags can be at least as terse as a plain HTML equivalent, and is usually more so.