Android Open Source - min3d Example Rotating Planets

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License

The source code is released under:

MIT License

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Java Source Code

package com.min3d;
//from   ww  w  . j  a va  2  s.  c  o m
import android.graphics.Bitmap;

import com.min3d.lib.Shared;
import com.min3d.lib.Utils;
import com.min3d.lib.core.Object3dContainer;
import com.min3d.lib.core.RendererActivity;
import com.min3d.lib.objectPrimitives.Sphere;
import com.min3d.lib.vos.Light;

/**
 * This is the "demo" example.
 * It shows how to add children to Object3dContainers.  
 * 
 * If you're familiar with Flash, this is similar to adding DisplayObjects to the displaylist.
 * 
 * If you're familiar with Papervision3D or Away3D for Flash, this is similar to using 
 * DisplayObject3D's or Object3D's to the Scene.
 * 
 * @author Lee
 */
public class ExampleRotatingPlanets extends RendererActivity
{
  Object3dContainer _jupiter;
  Object3dContainer _earth;
  Object3dContainer _moon;
  int _count;
  
  public void initScene() 
  {
    Light light = new Light();
    
    light.ambient.setAll((short)64, (short)64, (short)64, (short)255);
    light.position.setAll(3, 3, 3);
    scene.lights().add(light);
    
    // Add Jupiter to scene
    _jupiter = new Sphere(0.8f, 15, 10, true,true,false);
    scene.addChild(_jupiter);

    // Add Earth as a child of Jupiter
    _earth = new Sphere(0.4f, 12, 9, true,true,false);
    _earth.position().x = 1.6f;
    _earth.rotation().x = 23;
    _jupiter.addChild(_earth);
 
    // Add the Moon as a child of Earth
    _moon = new Sphere(0.2f, 10, 8,  true,true,false);
    _moon.position().x = 0.6f;
    _earth.addChild(_moon);

    // Add textures to TextureManager    
    Bitmap b = Utils.makeBitmapFromResourceId(this, R.drawable.jupiter);
    Shared.textureManager().addTextureId(b, "jupiter", false);
    b.recycle();

    b = Utils.makeBitmapFromResourceId(this, R.drawable.earth);
    Shared.textureManager().addTextureId(b, "earth", false);
    b.recycle();
      
    b = Utils.makeBitmapFromResourceId(this, R.drawable.moon);
    Shared.textureManager().addTextureId(b, "moon", false);
    b.recycle();

    // Add textures to objects based on on the id's we assigned the textures in the texture manager
    _jupiter.textures().addById("jupiter");
    _earth.textures().addById("earth");
    _moon.textures().addById("moon");
    
    _count = 0;
  }
  
  @Override 
  public void updateScene() 
  {
    // Spin spheres
    _jupiter.rotation().y += 1.0f;
    _earth.rotation().y += 3.0f;
    _moon.rotation().y -= 12.0f;
    
    // Wobble Jupiter a little just for fun 
    _count++;
    float mag = (float)(Math.sin(_count*0.2*Utils.DEG)) * 15;
    _jupiter.rotation().z = (float)Math.sin(_count*.33*Utils.DEG) * mag;
    
    // Move camera around
    scene.camera().position.z = 4.5f + (float)Math.sin(_jupiter.rotation().y * Utils.DEG);
    scene.camera().target.x = (float)Math.sin((_jupiter.rotation().y + 90) * Utils.DEG) * 0.8f;
  }
}

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