Game Development Reference
In-Depth Information
Listing 12-12. WorldRenderer.java, the World Renderer
package
com.badlogic.androidgames.androidinvaders;
import
java.util.List;
import
javax.microedition.khronos.opengles.GL10;
import
com.badlogic.androidgames.framework.gl.AmbientLight;
import
com.badlogic.androidgames.framework.gl.Animation;
import
com.badlogic.androidgames.framework.gl.DirectionalLight;
import
com.badlogic.androidgames.framework.gl.LookAtCamera;
import
com.badlogic.androidgames.framework.gl.SpriteBatcher;
import
com.badlogic.androidgames.framework.gl.TextureRegion;
import
com.badlogic.androidgames.framework.impl.GLGraphics;
import
com.badlogic.androidgames.framework.math.Vector3;
public class
WorldRenderer {
GLGraphics glGraphics;
LookAtCamera camera;
AmbientLight ambientLight;
DirectionalLight directionalLight;
SpriteBatcher batcher;
float
invaderAngle = 0;
The
WorldRenderer
keeps track of the
GLGraphics
instance from which we'll fetch the
GL10
instance. We also have a
LookAtCamera
, an
AmbientLight
, a
DirectionLight
, and a
SpriteBatcher
. Finally, we use a member to keep track of the current rotation angle for all
invaders.
public
WorldRenderer(GLGraphics glGraphics) {
this
.glGraphics = glGraphics;
camera =
new
LookAtCamera(67, glGraphics.getWidth()
/ (
float
) glGraphics.getHeight(), 0.1f, 100);
camera.getPosition().set(0, 6, 2);
camera.getLookAt().set(0, 0, -4);
ambientLight =
new
AmbientLight();
ambientLight.setColor(0.2f, 0.2f, 0.2f, 1.0f);
directionalLight =
new
DirectionalLight();
directionalLight.setDirection(−1, -0.5f, 0);
batcher =
new
SpriteBatcher(glGraphics, 10);
}
In the constructor, we set up all members, as usual. The camera has a field of view of
67 degrees, a near clipping plane distance of 0.1 units, and a far clipping plane distance
of 100 units. The view frustum will thus easily contain the entire game world. We position
it above and behind the ship and let it look at (0,0,-4). The ambient light is just a faint gray,
and the directional light is white and comes from the top-right side. Finally, we instantiate the
SpriteBatcher
so that we can render the explosion rectangles.
