mirror of https://github.com/OpenTTD/OpenTTD.git
98 lines
2.4 KiB
C++
98 lines
2.4 KiB
C++
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/* $Id$ */
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/*
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* This file is part of OpenTTD.
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* OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
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* OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** @file tilearea.cpp Handling of tile areas. */
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#include "stdafx.h"
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#include "tile_map.h"
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#include "core/math_func.hpp"
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#include "tilearea_type.h"
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/**
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* Construct this tile area based on two points.
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* @param start the start of the area
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* @param end the end of the area
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*/
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TileArea::TileArea(TileIndex start, TileIndex end)
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{
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uint sx = TileX(start);
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uint sy = TileY(start);
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uint ex = TileX(end);
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uint ey = TileY(end);
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if (sx > ex) Swap(sx, ex);
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if (sy > ey) Swap(sy, ey);
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this->tile = TileXY(sx, sy);
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this->w = ex - sx + 1;
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this->h = ey - sy + 1;
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}
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/**
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* Add a single tile to a tile area; enlarge if needed.
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* @param to_add The tile to add
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*/
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void TileArea::Add(TileIndex to_add)
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{
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if (this->tile == INVALID_TILE) {
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this->tile = to_add;
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this->w = 1;
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this->h = 1;
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return;
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}
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uint sx = TileX(this->tile);
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uint sy = TileY(this->tile);
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uint ex = sx + this->w - 1;
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uint ey = sy + this->h - 1;
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uint ax = TileX(to_add);
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uint ay = TileY(to_add);
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sx = min(ax, sx);
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sy = min(ay, sy);
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ex = max(ax, ex);
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ey = max(ay, ey);
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this->tile = TileXY(sx, sy);
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this->w = ex - sx + 1;
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this->h = ey - sy + 1;
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}
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/**
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* Does this tile area intersect with another?
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* @param ta the other tile area to check against.
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* @return true if they intersect.
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*/
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bool TileArea::Intersects(const TileArea &ta) const
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{
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if (ta.w == 0 || this->w == 0) return false;
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assert(ta.w != 0 && ta.h != 0 && this->w != 0 && this->h != 0);
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uint left1 = TileX(this->tile);
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uint top1 = TileY(this->tile);
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uint right1 = left1 + this->w - 1;
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uint bottom1 = top1 + this->h - 1;
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uint left2 = TileX(ta.tile);
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uint top2 = TileY(ta.tile);
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uint right2 = left2 + ta.w - 1;
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uint bottom2 = top2 + ta.h - 1;
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return !(
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left2 > right1 ||
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right2 < left1 ||
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top2 > bottom1 ||
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bottom2 < top1
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);
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}
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