Method OnSmoothTerrain

editor/TerrainDialog.cpp:1416–1504

}

void CTerrainDialog::OnSmoothTerrain() {
  uint8_t *src_data;
  int y, x;

  if (Num_terrain_selected == 0) {
    OutrageMessageBox("This operation works on selected cells.  You have no cells selected!");
    return;
  }

  if ((MessageBox("Are you sure you wish to smooth the terrain?  This operation cannot be undone.", "Question",
                  MB_YESNO)) == IDNO)
    return;

  src_data = (uint8_t *)mem_malloc(TERRAIN_WIDTH * TERRAIN_DEPTH);
  ASSERT(src_data); // Ran out of memory!

  for (int i = 0; i < TERRAIN_WIDTH * TERRAIN_DEPTH; i++)
    src_data[i] = Terrain_seg[i].ypos;

  int w = TERRAIN_WIDTH;
  int h = TERRAIN_DEPTH;

  for (y = 0; y < h; y++) {
    for (x = 0; x < w; x++) {
      if (!TerrainSelected[y * w + x])
        continue;

      int total = 0;
      int num = 0;

      total += src_data[y * w + x];
      num++;

      // Left edge
      if (x != 0) {

        total += src_data[y * w + (x - 1)];
        num++;

        if (y != 0) {
          total += src_data[(y - 1) * w + (x - 1)];
          num++;
        }

        if (y != h - 1) {
          total += src_data[(y + 1) * w + (x - 1)];
          num++;
        }
      }

      // Right edge
      if (x != (w - 1)) {
        total += src_data[(y)*w + (x + 1)];
        num++;

        if (y != 0) {
          total += src_data[(y - 1) * w + (x + 1)];
          num++;