Android Open Source - 4est Map

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Back to project page 4est.

License

The source code is released under:

MIT License

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Java Source Code

package com.wordsaretoys.forest;
/* w w  w .j  a v  a 2  s  .c  o  m*/
import java.util.Random;

import com.wordsaretoys.rise.utility.Misc;

/**
 * represents the debris map and the attributes of its components
 */

public class Map {

  public static final int Engine = 0;
  public static final int Shard = 1;

  public interface Listener {
    public void onObject(long id, int what, float x, float y, float z, float r);
  }
  
  static final float CellSize = 0.5f;
  
  static final float[] probabilityMap = { 0.009f, 0.05f };
  static final float[] maxRadius = { 0.05f, 0.2f };
  
  Random rng = new Random();
  
  /**
   * scans the specified volume for objects
   * calls Listener.onObject for each found
   */
  public void scanVolume(float cx, float cy, float cz, float r, Listener l) {
    
    float x0 = (float)Math.floor((cx - r) / CellSize) * CellSize;
    float y0 = (float)Math.floor((cy - r) / CellSize) * CellSize;
    float z0 = (float)Math.floor((cz - r) / CellSize) * CellSize;
    float x1 = (float)Math.floor((cx + r) / CellSize) * CellSize;
    float y1 = (float)Math.floor((cy + r) / CellSize) * CellSize;
    float z1 = (float)Math.floor((cz + r) / CellSize) * CellSize;
    float hs = CellSize * 0.5f;
    
    if (y0 < -2) y0 = -3;
    if (y1 > 2) y1 = 3;
    
    for (float x = x0 + hs; x < x1; x += CellSize) {
      for (float y = y0 + hs; y < y1; y += CellSize) {
        for (float z = z0 + hs; z < z1; z += CellSize) {
          
          rng.setSeed(Misc.hash(x, y, z, 0));
          float select = rng.nextFloat();
          for (int i = 0; i < probabilityMap.length; i++) {
            if (select < probabilityMap[i]) {
              
              float mr = maxRadius[i];
              
              float ox = x + hs * Misc.scale(rng.nextFloat(), -1, 1);
              float oy = y + hs * Misc.scale(rng.nextFloat(), -1, 1);
              float oz = z + hs * Misc.scale(rng.nextFloat(), -1, 1);
              
              long id = Misc.hash(ox, oy, oz, i);
              
              l.onObject(id, i, ox, oy, oz, mr);
              
              break;
            }
          }
          
        }
      }
    }
    
  }
  
}

Java Source Code List