3D Programming Tricks - Beginning Android Games - page 563

Listing 11-11. LookAtCamera.java, a Simple Look-At Camera Without Bells and Whistles
package com.badlogic.androidgames.framework.gl;
import javax.microedition.khronos.opengles.GL10;
import android.opengl.GLU;
import com.badlogic.androidgames.framework.math.Vector3;
public class LookAtCamera {
final Vector3 position;
final Vector3 up;
final Vector3 lookAt;
float fieldOfView;
float aspectRatio;
float near;
float far;
public LookAtCamera( float fieldOfView, float aspectRatio, float near, float far) {
this .fieldOfView = fieldOfView;
this .aspectRatio = aspectRatio;
this .near = near;
this .far = far;
position = new Vector3();
up = new Vector3(0, 1, 0);
lookAt = new Vector3(0,0,-1);
}
public Vector3 getPosition() {
return position;
}
public Vector3 getUp() {
return up;
}
public Vector3 getLookAt() {
return lookAt;
}
public void setMatrices(GL10 gl) {
gl.glMatrixMode(GL10. GL_PROJECTION );
gl.glLoadIdentity();
GLU. gluPerspective (gl, fieldOfView, aspectRatio, near, far);
gl.glMatrixMode(GL10. GL_MODELVIEW );
gl.glLoadIdentity();
GLU. gluLookAt (gl, position.x, position.y, position.z, lookAt.x, lookAt.y, lookAt.z,
up.x, up.y, up.z);
}
}