Drone Grid Case Study: Creating the Enemies - Beginning Android 3D Game Development - page 311

Hands-on Example: Arena Objects and Tanks
Now, let's use the Arena Object class and the Tank class in a working hands-on example. We must
make some modifications to our code from Chapter 7's hands-on example. This hands-on example
should also be available from the Source Code/Download area of apress.com .

Modifying the MyGLRenderer Class
The type for the m_Cube variable has been changed to an ArenaObject class.

private ArenaObject3d m_Cube;

In the CreateCube() function, we create a new ArenaObject instead of a Cube object.

m_Cube = new ArenaObject3d(iContext, null,CubeMesh, CubeTex, Material1, Shader,XMaxBoundary,XMinBou
ndary,ZMaxBoundary,ZMinBoundary);

The onDrawFrame() function now updates m_Cube with UpdateArenaObject() instead of
UpdateObject3d() .

m_Cube.UpdateArenaObject();

Next, we have to add in some code for our new tank. I will discuss the key functions in this section.
The m_Tank variable is added in to represent our enemy tank.

private Tank m_Tank;

The CreateTankType1() function (see Listing 8-63) creates the tank object. The CreateTankType1()
function does the following:

1. Creates the tank's weapon and ammunition

2. Creates the material for the tank's main body

3. Creates the tank's main body texture

4. Creates the mesh for the main tank body with data from

Pyramid2.Pyramid2Vertices

5. Creates the material for the tank's turret

6. Creates the texture for the tank's turret

Creates the tank's turret mesh with data from Pyramid2.Pyramid2Vertices

7.

8. Creates the tank's turret offset

9. Creates the tank's shader

10. Initializes the tank properties, such as the tank's position, scale, sound

effects, color that it makes on the grid, etc.