public Martini()

in baremaps-dem/src/main/java/org/apache/baremaps/dem/Martini.java [43:92]

• 46 lines of code
• 6 McCabe index (conditional complexity)

  public Martini(int gridSize) {
    this.gridSize = gridSize;

    int tileSize = gridSize - 1;
    if ((tileSize & (tileSize - 1)) != 0) {
      throw new IllegalArgumentException("Expected grid size to be 2^n+1, got " + gridSize + ".");
    }

    this.numTriangles = tileSize * tileSize * 2 - 2;
    this.numParentTriangles = this.numTriangles - tileSize * tileSize;

    this.baseCoords = new int[this.numTriangles * 4];
    for (int i = 0; i < this.numTriangles; i++) {
      int id = i + 2;
      int ax = 0;
      int ay = 0;
      int bx = 0;
      int by = 0;
      int cx = 0;
      int cy = 0;
      if ((id & 1) != 0) {
        bx = by = cx = tileSize;
      } else {
        ax = ay = cy = tileSize;
      }
      while ((id >>= 1) > 1) {
        int mx = (ax + bx) >> 1;
        int my = (ay + by) >> 1;

        if ((id & 1) != 0) {
          bx = ax;
          by = ay;
          ax = cx;
          ay = cy;
        } else {
          ax = bx;
          ay = by;
          bx = cx;
          by = cy;
        }
        cx = mx;
        cy = my;
      }
      int k = i * 4;
      this.baseCoords[k] = ax;
      this.baseCoords[k + 1] = ay;
      this.baseCoords[k + 2] = bx;
      this.baseCoords[k + 3] = by;
    }
  }