Android Open Source - opengl Solar System Renderer

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License

The source code is released under:

Apache License

Java Source Code

package book.SolarSystem;
// ww  w  .  j a  v  a 2 s .  c o  m
import javax.microedition.khronos.egl.EGLConfig;
import javax.microedition.khronos.opengles.GL10;

import android.opengl.GLSurfaceView;
import java.lang.Math;

class SolarSystemRenderer implements GLSurfaceView.Renderer 
{
    public SolarSystemRenderer() 
    {
      mPlanet=new Planet(10,10,1.0f, 1.0f);
    }
    
    public void onDrawFrame(GL10 gl) 
    {
         gl.glClear(GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT);
         gl.glClearColor(0.0f,0.0f,0.0f,1.0f);
         gl.glMatrixMode(GL10.GL_MODELVIEW);
         gl.glLoadIdentity();
      
         gl.glTranslatef(0.0f,(float)Math.sin(mTransY), -4.0f);
      
         gl.glRotatef(mAngle, 1, 0, 0);
         gl.glRotatef(mAngle, 0, 1, 0);
        
         mPlanet.draw(gl);
           
         mTransY+=.075f; 
         mAngle+=.4;
    }

  
  public void onSurfaceChanged(GL10 gl, int width, int height) {
       gl.glViewport(0, 0, width, height);
  
       /*
        * Set our projection matrix. This doesn't have to be done
        * each time we draw, but usually a new projection needs to
        * be set when the viewport is resized.
        */
       
     float aspectRatio;
    float zNear =.1f;
    float zFar =1000f;
    float fieldOfView = 30.0f/57.3f;
    float  size;
    
    gl.glEnable(GL10.GL_NORMALIZE);
    
    aspectRatio=(float)width/(float)height;        //h/w clamps the fov to the height, flipping it would make it relative to the width
    
    //Set the OpenGL projection matrix
    
    gl.glMatrixMode(GL10.GL_PROJECTION);
    
    size = zNear * (float)(Math.tan((double)(fieldOfView/2.0f)));
    gl.glFrustumf(-size, size, -size/aspectRatio, size /aspectRatio, zNear, zFar);
    
    //Make the OpenGL modelview matrix the default
    
    gl.glMatrixMode(GL10.GL_MODELVIEW);
  }
  
  public void onSurfaceCreated(GL10 gl, EGLConfig config) {
      /*
       * By default, OpenGL enables features that improve quality
       * but reduce performance. One might want to tweak that
       * especially on software renderer.
       */
      gl.glDisable(GL10.GL_DITHER);
  
      /*
       * Some one-time OpenGL initialization can be made here
       * probably based on features of this particular context
       */
       gl.glHint(GL10.GL_PERSPECTIVE_CORRECTION_HINT,
               GL10.GL_FASTEST);
  
       gl.glEnable(GL10.GL_CULL_FACE);
       gl.glCullFace(GL10.GL_BACK);
       gl.glShadeModel(GL10.GL_SMOOTH);
       gl.glEnable(GL10.GL_DEPTH_TEST);
  }

  private Planet mPlanet;
  private float mTransY;
  private float mAngle;
}

Java Source Code List

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