Android Open Source - min3d Sphere

From Project

Back to project page min3d.

License

The source code is released under:

MIT License

If you think the Android project min3d listed in this page is inappropriate, such as containing malicious code/tools or violating the copyright, please email info at java2s dot com, thanks.

Java Source Code

package com.min3d.lib.objectPrimitives;
//from   w  ww  .ja va2s .c  o  m

import com.min3d.lib.Utils;
import com.min3d.lib.core.Object3dContainer;
import com.min3d.lib.vos.Color4;
import com.min3d.lib.vos.Number3d;

/**
 * Creates a sphere.
 * Vertex colors are assigned randomly across the 'latitudes' of the sphere,
 */
public class Sphere extends Object3dContainer
{
  private float _radius;
  private int _cols;
  private int _rows;
  
  
  public Sphere(float $radius, int $columns, int $rows, Boolean $useUvs, Boolean $useNormals, Boolean $useVertexColors)
  {
    super(
      ($columns+1) * ($rows+1),
      $columns * $rows * 2,
      $useUvs,
      $useNormals,
      $useVertexColors
    );

    _cols = $columns;
    _rows = $rows;
    _radius = $radius;

    build();
  }

  public Sphere(float $radius, int $columns, int $rows)
  {
    super(
        ($columns+1) * ($rows+1),
        $columns * $rows * 2,
        true,
        true,
        true
      );

      _cols = $columns;
      _rows = $rows;
      _radius = $radius;
      
      build();
  } 
  
  public Sphere(float $radius, int $columns, int $rows, Color4 color)
  {
    super(
        ($columns+1) * ($rows+1),
        $columns * $rows * 2,
        true,
        true,
        true
    );
    defaultColor(color);
    _cols = $columns;
    _rows = $rows;
    _radius = $radius;
    
    build();
  }
  
  private void build()
  {
    int r, c;
    
    Number3d n = new Number3d();
    Number3d pos = new Number3d();
    Number3d posFull = new Number3d();

    if( defaultColor() == null ) defaultColor(new Color4());
    // Build vertices
        
    for (r = 0; r <= _rows; r++)
    {
      float v = (float)r / (float)_rows; // [0,1]
      float theta1 = v * (float)Math.PI; // [0,PI]

      n.setAll(0,1,0);
      n.rotateZ(theta1); 

      // each 'row' assigned random color. for the hell of it.
      
      for (c = 0; c <= _cols; c++)
      {
        float u = (float)c / (float)_cols; // [0,1]
        float theta2 = u * (float)(Math.PI * 2f); // [0,2PI]
        pos.setAllFrom(n);
        pos.rotateY(theta2);
        
        posFull.setAllFrom(pos);
        posFull.multiply(_radius);
        
        
        this.vertices().addVertex(posFull.x,posFull.y,posFull.z,  u,v,  pos.x,pos.y,pos.z,  defaultColor().r,defaultColor().g,defaultColor().b,defaultColor().a);
      }
    }


    // Add faces

    int colLength = _cols + 1;
    
    for (r = 0; r < _rows; r++)
    {
      int offset = r * colLength; 
      
      for (c = 0; c < _cols; c++)
      {
        int ul = offset  +  c;
        int ur = offset  +  c+1;
        int br = offset  +  (int)(c + 1 + colLength);
        int bl = offset  +  (int)(c + 0 + colLength);
        
        Utils.addQuad(this, ul, ur, br, bl);
      }
    }
  }
}

Java Source Code List