Building your First Mobile Game using XNA 4.0 by Brecht Kets

By Brecht Kets

Construction a 3D video game for the home windows mobilephone 7 platform. Drawing 2nd and 3D pics on home windows telephone. utilizing the wealthy services of the home windows mobilephone platform. making a customized framework step-by-step that might act as a base for construction (future) video games. an enticing and arms on beginner's consultant to home windows mobile 7 3D video game improvement utilizing XNA 4.0.

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1. Increment the total frame time with the time that passed since the last update was called (in milliseconds). 2. If the total frame time is greater or equal to our specified interval time, we can calculate the new frame. If not, we don't do any further calculations. 3. If we have a sprite sheet that has multiple rows, the location of the frame rectangle is set to a new point. The position of the rectangle will be the width and height of one frame multiplied by an offset. This will position our rectangle on the proper frame.

This will then get passed to the update and draw methods of all our 3D objects. public Camera Camera { get; set; } The GameModel Now we can start by building our model class. This class will inherit from GameObject3D, and is very similar to the GameSprite class; except it will handle drawing models. info 3D Graphics Fields This class will have two fields, one for the path to the asset and one of type Model that will hold the model. private readonly string _assetFile; private Model _model; Constructor In the constructor, we will only store the path to the model.

This is called composition. In the context of composition, Herb Sutter has said the following: Prefer composition to inheritance The reasons why will become obvious when we implement the scene graph and when we make an animated sprite. For now, just go with it. Fields The class has three fields, a game sprite, a direction that determines if the player is going left or right, and the speed of movement. The direction is an integer and the speed is a constant integer. All fields can have the private access specifier.

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