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/* $Id: trafficlight.h $ */
/*
* This file is part of OpenTTD.
* 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.
* 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.
* 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/>.
*/
/** @file trafficlight.h variables used for handling trafficlights. */
/**
* Used for synchronising traffic light signals.
* Number below is how far we look into the _tl_check_offsets array when
* placing trafficlights, based on _settings_game.construction.max_tlc_distance.
*/
static const uint8 _tlc_distance[5] = {
0, ///< no synchronizing.
8, ///< adjecant tiles only.
24, ///< 2 tiles away.
48, ///< 3 tiles away.
80 ///< 4 tiles away.
};
/** TileDiffs for the adjacent tiles and those a little further away. */
static const TileIndexDiffC _tl_check_offsets[80] = {
/* Tiles next to this tile (8 tiles). */
{-1, -1},
{ 0, -1},
{ 1, -1},
{ 1, 0},
{ 1, 1},
{ 0, 1},
{-1, 1},
{-1, 0},
/* Tiles two tiles away from this tile (16 tiles). */
{-2, -2},
{-1, -2},
{ 0, -2},
{ 1, -2},
{ 2, -2},
{ 2, -1},
{ 2, 0},
{ 2, 1},
{ 2, 2},
{ 1, 2},
{ 0, 2},
{-1, 2},
{-2, 2},
{-2, 1},
{-2, 0},
{-2, -1},
/* Tiles three tiles away from this tile (24 tiles). */
{-3, -3},
{-3, -2},
{-3, -1},
{-3, 0},
{-3, 1},
{-3, 2},
{-3, 3},
{-2, 3},
{-1, 3},
{ 0, 3},
{ 1, 3},
{ 2, 3},
{ 3, 3},
{ 3, 2},
{ 3, 1},
{ 3, 0},
{ 3, -1},
{ 3, -2},
{ 3, -3},
{ 2, -3},
{ 1, -3},
{ 0, -3},
{-1, -3},
{-2, -3},
/* Tiles four tiles away from this tile (32 tiles). */
{-4, -4},
{-3, -4},
{-2, -4},
{-1, -4},
{ 0, -4},
{ 1, -4},
{ 2, -4},
{ 3, -4},
{ 4, -4},
{ 4, -3},
{ 4, -2},
{ 4, -1},
{ 4, 0},
{ 4, 1},
{ 4, 2},
{ 4, 3},
{ 4, 4},
{ 3, 4},
{ 2, 4},
{ 1, 4},
{ 0, 4},
{-1, 4},
{-2, 4},
{-3, 4},
{-4, 4},
{-4, 3},
{-4, 2},
{-4, 1},
{-4, 0},
{-4, -1},
{-4, -2},
{-4, -3}
};
/**
* Drawing offsets for the traffic light posts [roadside (left, right)][direction (SW, SE, NW, NE)].
*/
static const Point _tl_offsets[2][4] = {
{{15, 1}, {14, 15}, {1, 0}, {0, 14}}, // Left side driving.
{{15, 14}, {1, 15}, {14, 0}, {0, 1}} // Right side driving.
};
/**
* Sprites needed for the various states of a TL crossing [state][direction].
*/
static const SpriteID _tls_to_sprites[7][4] = {
{SPR_TL_SW_NONE, SPR_TL_SE_NONE, SPR_TL_NW_NONE, SPR_TL_NE_NONE},
{SPR_TL_SW_GREEN, SPR_TL_SE_RED, SPR_TL_NW_RED, SPR_TL_NE_GREEN},
{SPR_TL_SW_YELLOW, SPR_TL_SE_RED, SPR_TL_NW_RED, SPR_TL_NE_YELLOW},
{SPR_TL_SW_RED, SPR_TL_SE_RED_YELLOW, SPR_TL_NW_RED_YELLOW, SPR_TL_NE_RED},
{SPR_TL_SW_RED, SPR_TL_SE_GREEN, SPR_TL_NW_GREEN, SPR_TL_NE_RED},
{SPR_TL_SW_RED, SPR_TL_SE_YELLOW, SPR_TL_NW_YELLOW, SPR_TL_NE_RED},
{SPR_TL_SW_RED_YELLOW, SPR_TL_SE_RED, SPR_TL_NW_RED, SPR_TL_NE_RED_YELLOW}
};
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