Method OnDropTerrain

editor/TerrainDialog.cpp:1544–1612

#include "EditLineDialog.h"

void CTerrainDialog::OnDropTerrain() {
  int desired_height, lowest_height, highest_height, delta_height;
  int x, y;

  // Find lowest & highest terrain values
  for (x = 0, lowest_height = INT_MAX, highest_height = 0; x < TERRAIN_WIDTH; x++)
    for (y = 0; y < TERRAIN_DEPTH; y++) {
      if (Terrain_seg[x * TERRAIN_WIDTH + y].ypos < lowest_height)
        lowest_height = Terrain_seg[x * TERRAIN_WIDTH + y].ypos;
      if (Terrain_seg[x * TERRAIN_WIDTH + y].ypos > highest_height)
        highest_height = Terrain_seg[x * TERRAIN_WIDTH + y].ypos;
    }

  // Get desired terrain level
get_height:;
  if (!InputNumber(&desired_height, "Raise/Lower Terrain", "Enter the desired height for the lowest terrain point:"))
    return;

  // Check valid values
  if ((desired_height < 0) || (desired_height > 255)) {
    OutrageMessageBox("Invalid value: the height must be between 0 and 255, inclusive.");
    goto get_height;
  }
  if (((highest_height - lowest_height) + desired_height) > 255) {
    OutrageMessageBox("The delta height of the terrain is %d, so you cannot set the lowest point above %d.",
                      highest_height - lowest_height, 255 - (highest_height - lowest_height));
    goto get_height;
  }

  // Compute delta
  delta_height = desired_height - lowest_height;

  // Now lower the terrain
  for (x = 0; x < TERRAIN_WIDTH; x++)
    for (y = 0; y < TERRAIN_DEPTH; y++)
      Terrain_seg[x * TERRAIN_WIDTH + y].ypos += delta_height;

  // Update stuff
  BuildMinMaxTerrain();

  // How much we move by
  float delta_y = delta_height * TERRAIN_HEIGHT_INCREMENT;

  int r, v, o, p, n;
  room *rp;

  // Drop all the rooms
  for (r = 0, rp = Rooms; r <= Highest_room_index; r++, rp++)
    if (rp->used)
      for (v = 0; v < rp->num_verts; v++)
        rp->verts[v].y += delta_y;

  // Drop all the objects
  for (o = 0; o <= Highest_object_index; o++)
    if (Objects[o].type != OBJ_NONE) {
      vector new_pos = Objects[o].pos;
      new_pos.y += delta_y;
      ObjSetPos(&Objects[o], &new_pos, Objects[o].roomnum, NULL, false);