Android Open Source - 4est Height Mapper

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License

The source code is released under:

MIT License

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Java Source Code

package com.wordsaretoys.rise.meshutil;
//w ww .j  av  a 2s.co m

/**
 * generates an indexed grid of vertexes
 * use for heightmaps
 */

public class HeightMapper {

  protected VertexBuffer vbuffer;
  protected IndexBuffer ibuffer;
  protected int stride;

  /**
   * override in your own subclass
   */
  public void handle(VertexBuffer vb, boolean cw, float ir, float jr) {}
  
  /**
   * constructor
   * @param vb vertex buffer
   * @param ib index buffer
   * @param stride stride length (maintained in mesh)
   */
  public HeightMapper(VertexBuffer vb, IndexBuffer ib, int stride) {
    vbuffer = vb;
    ibuffer = ib;
    this.stride = stride;
  }
  
  /**
   * execute a mapping
   * @param il, jl number of steps in each dimension
   * @param cw true if clockwise winding, false if ccw
   */
  public void run(int il, int jl, boolean cw) {
    int im = il - 1;
    int jm = jl - 1;
    int k = vbuffer.length / stride;
    int i, j;

    for (i = 0; i < il; i++) {
      for (j = 0; j < jl; j++, k++) {
        handle(vbuffer, cw, (float)i / (float)im, (float)j / (float)jm);
        if (i < im && j < jm) {
          if (cw) {
            ibuffer.set((short)(k), (short)(k + jl), (short)(k + 1));
            ibuffer.set((short)(k + jl), (short)(k + jl + 1), (short)(k + 1));
          } else {
            ibuffer.set((short)(k), (short)(k + 1), (short)(k + jl));
            ibuffer.set((short)(k + jl), (short)(k + 1), (short)(k + jl + 1));
          }
        }
      }
    }
  }
  
}

Java Source Code List