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authorcelestar <celestar@openttd.org>2006-04-05 08:28:03 +0000
committercelestar <celestar@openttd.org>2006-04-05 08:28:03 +0000
commit0a79bc83578bddf4325aa30f4b542eb470340137 (patch)
tree15f4d1b016b2816ba40d016adeb348bac6819b69
parent167faea09e0db0e5e79974a075d25810301af319 (diff)
downloadopenttd-0a79bc83578bddf4325aa30f4b542eb470340137.tar.xz
(svn r4281) -Cleanup: Begun cleaning up elrail code a bit, mostly comments and enum/array alignment
-rw-r--r--elrail.c26
-rw-r--r--table/elrail_data.h319
2 files changed, 217 insertions, 128 deletions
diff --git a/elrail.c b/elrail.c
index 5b4a628fc..ef0a44cbe 100644
--- a/elrail.c
+++ b/elrail.c
@@ -1,6 +1,6 @@
/* $Id$ */
/** @file elrail.c
- * This file deals with displaying wires and pylons for electric railway systems.
+ This file deals with displaying wires and pylons for electric railways.
<h2>Basics</h2>
<h3>Tile Types</h3>
@@ -22,21 +22,23 @@ Group 3: Tiles with both an odd X and Y coordnate.
<h4>Control Points</h4>
A Pylon Control Point (PCP) is a position where a wire (or rather two)
is mounted onto a pylon.
-Each NRT does contain 4 PCPs which are mapped to a byte
-variable and are represented by the DiagDirection enum:
+Each NRT does contain 4 PCPs which are bitmapped to a byte
+variable and are represented by the DiagDirection enum
-A wire that ends on the PCP has a dark ending, otherwise the end is bright.<p>
+Each track ends on two PCPs and thus requires one pylon on each end. However,
+there is one exception: Straight-and-level tracks only have one pylon every
+other tile.
-Now on each edge there are two PCPs: One from each adjacent tile. Both PCPs are merged
-using an OR matrix (i. e. if one tile needs a PCP at the postion in question, both
-tiles get it).
+Now on each edge there are two PCPs: One from each adjacent tile. Both PCPs
+are merged using an OR operation (i. e. if one tile needs a PCP at the postion
+in question, both tiles get it).
<h4>Position Points</h4>
-A Pylon Position Point (PPP) is a position where a pylon is located on the ground.
-Each PCP owns 8 in (45 degree steps) PPPs that are located around it. PPPs are numbered
-0 to 7 with 0 starting north and numbering in clockwise direction. Each track bit has PPPs
-that are impossible (because the pylon would be situated on the track), preferred (because
-the pylon would be rectangular to the track). PPPs are represented by the Direction enum.
+A Pylon Position Point (PPP) is a position where a pylon is located on the
+ground. Each PCP owns 8 in (45 degree steps) PPPs that are located around
+it. PPPs are represented using the Direction enum. Each track bit has PPPs
+that are impossible (because the pylon would be situated on the track) and
+some that are preferred (because the pylon would be rectangular to the track).
<img src="../../elrail_tile.png">
<img src="../../elrail_track.png">
diff --git a/table/elrail_data.h b/table/elrail_data.h
index 984cc9594..c9965f51d 100644
--- a/table/elrail_data.h
+++ b/table/elrail_data.h
@@ -1,10 +1,12 @@
/* $Id */
-/** @file elrail_data.h Stores all the data for overhead wire and pylon drawing. @see elrail.c */
+/** @file elrail_data.h Stores all the data for overhead wire and pylon drawing.
+ @see elrail.c */
#ifndef ELRAIL_DATA_H
#define ELRAIL_DATA_H
-/** Tile Location group. This defines whether the X and or Y coordinate of a tile is even */
+/** Tile Location group.
+ This defines whether the X and or Y coordinate of a tile is even */
typedef enum TLG {
XEVEN_YEVEN = 0,
XEVEN_YODD = 1,
@@ -13,9 +15,9 @@ typedef enum TLG {
TLG_END
} TLG;
-/** When determining the pylon configuration on the edge, two tiles are taken into account:
- * the tile being drawn itself (the home tile, the one in ti->tile), and the neighbouring tile
- */
+/** When determining the pylon configuration on the edge, two tiles are taken
+ into account: the tile being drawn itself (the home tile, the one in
+ ti->tile), and the neighbouring tile */
typedef enum {
TS_HOME = 0,
TS_NEIGHBOUR = 1,
@@ -29,56 +31,151 @@ enum {
/** Which PPPs are possible at all on a given PCP */
static byte AllowedPPPonPCP[DIAGDIR_END] = {
- 1 << DIR_N | 1 << DIR_E | 1 << DIR_SE | 1 << DIR_S | 1 << DIR_W | 1 << DIR_NW,
- 1 << DIR_N | 1 << DIR_NE | 1 << DIR_E | 1 << DIR_S | 1 << DIR_SW | 1 << DIR_W,
- 1 << DIR_N | 1 << DIR_E | 1 << DIR_SE | 1 << DIR_S | 1 << DIR_W | 1 << DIR_NW,
- 1 << DIR_N | 1 << DIR_NE | 1 << DIR_E | 1 << DIR_S | 1 << DIR_SW | 1 << DIR_W,
+ 1 << DIR_N | 1 << DIR_E | 1 << DIR_SE | 1 << DIR_S | 1 << DIR_W | 1 << DIR_NW,
+ 1 << DIR_N | 1 << DIR_NE | 1 << DIR_E | 1 << DIR_S | 1 << DIR_SW | 1 << DIR_W,
+ 1 << DIR_N | 1 << DIR_E | 1 << DIR_SE | 1 << DIR_S | 1 << DIR_W | 1 << DIR_NW,
+ 1 << DIR_N | 1 << DIR_NE | 1 << DIR_E | 1 << DIR_S | 1 << DIR_SW | 1 << DIR_W,
};
-/** Which of the PPPs are inside the tile. For the two PPPs on the tile border the following system is used:
- if you rotate the PCP so that it is in the north, the eastern PPP belongs to the tile. */
+/** Which of the PPPs are inside the tile. For the two PPPs on the tile border
+ the following system is used: if you rotate the PCP so that it is in the
+ north, the eastern PPP belongs to the tile. */
static byte OwnedPPPonPCP[DIAGDIR_END] = {
- 1 << DIR_SE | 1 << DIR_S | 1 << DIR_SW | 1 << DIR_W,
- 1 << DIR_N | 1 << DIR_SW | 1 << DIR_W | 1 << DIR_NW,
- 1 << DIR_N | 1 << DIR_NE | 1 << DIR_E | 1 << DIR_NW,
- 1 << DIR_NE | 1 << DIR_E | 1 << DIR_SE | 1 << DIR_S
+ 1 << DIR_SE | 1 << DIR_S | 1 << DIR_SW | 1 << DIR_W,
+ 1 << DIR_N | 1 << DIR_SW | 1 << DIR_W | 1 << DIR_NW,
+ 1 << DIR_N | 1 << DIR_NE | 1 << DIR_E | 1 << DIR_NW,
+ 1 << DIR_NE | 1 << DIR_E | 1 << DIR_SE | 1 << DIR_S
+};
+
+/** Maps a track bit onto two PCP positions */
+static const DiagDirection PCPpositions[TRACK_END][2] = {
+ {DIAGDIR_NE, DIAGDIR_SW}, /* X */
+ {DIAGDIR_SE, DIAGDIR_NW}, /* Y */
+ {DIAGDIR_NW, DIAGDIR_NE}, /* UPPER */
+ {DIAGDIR_SE, DIAGDIR_SW}, /* LOWER */
+ {DIAGDIR_SW, DIAGDIR_NW}, /* LEFT */
+ {DIAGDIR_NE, DIAGDIR_SE}, /* RIGHT */
};
-/** Preferred points of each trackbit. Those are the ones perpendicular to the track, plus the point in
- extension of the track (to mark end-of-track).*/
+#define PCP_NOT_ON_TRACK 0xFF
+/** Preferred points of each trackbit. Those are the ones perpendicular to the
+ track, plus the point in extension of the track (to mark end-of-track). PCPs
+ which are not on either end of the track are fully preferred.
+ @see PCPpositions */
static byte PreferredPPPofTrackBitAtPCP[TRACK_END][DIAGDIR_END] = {
- {1 << DIR_NE | 1 << DIR_SE | 1 << DIR_NW, 0xFF, 1 << DIR_SE | 1 << DIR_SW | 1 << DIR_NW, 0xFF }, /* X */
- {0xFF, 1 << DIR_NE | 1 << DIR_SE | 1 << DIR_SW, 0xFF, 1 << DIR_SW | 1 << DIR_NW | 1 << DIR_NE }, /* Y */
- {1 << DIR_E | 1 << DIR_N | 1 << DIR_S, 0xFF, 0xFF, 1 << DIR_W | 1 << DIR_N | 1 << DIR_S}, /* UPPER */
- {0xFF, 1 << DIR_E | 1 << DIR_N | 1 << DIR_S, 1 << DIR_W | 1 << DIR_N | 1 << DIR_S, 0xFF}, /* LOWER */
- {0xFF, 0xFF, 1 << DIR_S | 1 << DIR_E | 1 << DIR_W, 1 << DIR_N | 1 << DIR_E | 1 << DIR_W}, /* LEFT */
- {1 << DIR_N | 1 << DIR_E | 1 << DIR_W, 1 << DIR_S | 1 << DIR_E | 1 << DIR_W, 0xFF, 0xFF}, /* RIGHT */
+ { /* X */
+ 1 << DIR_NE | 1 << DIR_SE | 1 << DIR_NW, /* NE */
+ PCP_NOT_ON_TRACK, /* SE */
+ 1 << DIR_SE | 1 << DIR_SW | 1 << DIR_NW, /* SW */
+ PCP_NOT_ON_TRACK /* NE */
+ }, { /* Y */
+ PCP_NOT_ON_TRACK,
+ 1 << DIR_NE | 1 << DIR_SE | 1 << DIR_SW,
+ PCP_NOT_ON_TRACK,
+ 1 << DIR_SW | 1 << DIR_NW | 1 << DIR_NE
+ }, { /* UPPER */
+ 1 << DIR_E | 1 << DIR_N | 1 << DIR_S,
+ PCP_NOT_ON_TRACK,
+ PCP_NOT_ON_TRACK,
+ 1 << DIR_W | 1 << DIR_N | 1 << DIR_S
+ }, { /* LOWER */
+ PCP_NOT_ON_TRACK,
+ 1 << DIR_E | 1 << DIR_N | 1 << DIR_S,
+ 1 << DIR_W | 1 << DIR_N | 1 << DIR_S,
+ PCP_NOT_ON_TRACK
+ }, { /* LEFT */
+ PCP_NOT_ON_TRACK,
+ PCP_NOT_ON_TRACK,
+ 1 << DIR_S | 1 << DIR_E | 1 << DIR_W,
+ 1 << DIR_N | 1 << DIR_E | 1 << DIR_W
+ }, { /* RIGHT */
+ 1 << DIR_N | 1 << DIR_E | 1 << DIR_W,
+ 1 << DIR_S | 1 << DIR_E | 1 << DIR_W,
+ PCP_NOT_ON_TRACK,
+ PCP_NOT_ON_TRACK
+ }
};
+#undef PCP_NOT_ON_TRACK
#define NUM_IGNORE_GROUPS 3
-/** In case we have a staight line, we place pylon only every two tiles, so there are certain tiles
- which we ignore. A straight line is found if we have exactly two preferred points.*/
+#define NO_IGNORE 0xFF
+/** In case we have a staight line, we place pylon only every two tiles,
+ so there are certain tiles which we ignore. A straight line is found if
+ we have exactly two preferred points.*/
static byte IgnoredPCP[NUM_IGNORE_GROUPS][TLG_END][DIAGDIR_END] = {
- {
- {1 << DIR_N | 1 << DIR_S , 1 << DIR_NE | 1 << DIR_SW, 1 << DIR_NW | 1 << DIR_SE, 1 << DIR_W | 1 << DIR_E},
- {0xFF , 1 << DIR_E | 1 << DIR_W, 1 << DIR_NW | 1 << DIR_SE, 1 << DIR_NE | 1 << DIR_SW},
- {1 << DIR_NW | 1 << DIR_SE, 1 << DIR_NE | 1 << DIR_SW, 1 << DIR_N | 1 << DIR_S , 0xFF},
- {1 << DIR_NW | 1 << DIR_SE, 0xFF , 0xFF, 1 << DIR_NE | 1 << DIR_SW}
+ { /* Ignore group 1 */
+ { /* X even, Y even */
+ 1 << DIR_N | 1 << DIR_S,
+ 1 << DIR_NE | 1 << DIR_SW,
+ 1 << DIR_NW | 1 << DIR_SE,
+ 1 << DIR_W | 1 << DIR_E
+ }, { /* X even, Y odd */
+ 0xFF,
+ 1 << DIR_E | 1 << DIR_W,
+ 1 << DIR_NW | 1 << DIR_SE,
+ 1 << DIR_NE | 1 << DIR_SW
+ }, { /* X odd, Y even */
+ 1 << DIR_NW | 1 << DIR_SE,
+ 1 << DIR_NE | 1 << DIR_SW,
+ 1 << DIR_N | 1 << DIR_S ,
+ 0xFF
+ }, { /* X odd, Y odd */
+ 1 << DIR_NW | 1 << DIR_SE,
+ 0xFF,
+ 0xFF,
+ 1 << DIR_NE | 1 << DIR_SW
+ }
},
- {
- {1 << DIR_E | 1 << DIR_W, 1 << DIR_N | 1 << DIR_S, 0xFF, 1 << DIR_E | 1 << DIR_W},
- {0xFF, 0xFF, 1 << DIR_N | 1 << DIR_S, 1 << DIR_N | 1 << DIR_S},
- {0xFF, 1 << DIR_E | 1 << DIR_W, 1 << DIR_E | 1 << DIR_W, 1 << DIR_N | 1 << DIR_S},
- {1 << DIR_N | 1 << DIR_S, 1 << DIR_N | 1 << DIR_S, 0xFF, 1 << DIR_E | 1 << DIR_W}
+ { /* Ignore group 2 */
+ {
+ 1 << DIR_E | 1 << DIR_W,
+ 1 << DIR_N | 1 << DIR_S,
+ 0xFF,
+ 1 << DIR_E | 1 << DIR_W
+ }, {
+ 0xFF,
+ 0xFF,
+ 1 << DIR_N | 1 << DIR_S,
+ 1 << DIR_N | 1 << DIR_S
+ }, {
+ 0xFF,
+ 1 << DIR_E | 1 << DIR_W,
+ 1 << DIR_E | 1 << DIR_W,
+ 1 << DIR_N | 1 << DIR_S
+ }, {
+ 1 << DIR_N | 1 << DIR_S,
+ 1 << DIR_N | 1 << DIR_S,
+ 0xFF,
+ 1 << DIR_E | 1 << DIR_W
+ }
},
- {
- {0xFF, 0xFF, 0xFF, 0xFF},
- {0xFF, 0xFF, 1 << DIR_E | 1 << DIR_W, 0xFF},
- {0xFF, 0xFF, 0xFF, 0xFF},
- {1 << DIR_E | 1 << DIR_W, 0xFF, 0xFF, 0xFF}
+ { /* Ignore group 3 */
+ {
+ 0xFF,
+ 0xFF,
+ 0xFF,
+ 0xFF
+ }, {
+ 0xFF,
+ 0xFF,
+ 1 << DIR_E | 1 << DIR_W,
+ 0xFF
+ }, {
+ 0xFF,
+ 0xFF,
+ 0xFF,
+ 0xFF
+ }, {
+ 1 << DIR_E | 1 << DIR_W,
+ 0xFF,
+ 0xFF,
+ 0xFF
+ }
}
};
+#undef NO_IGNORE
+
/** Which pylons can definately NOT be built */
static byte DisallowedPPPofTrackBitAtPCP[TRACK_END][DIAGDIR_END] = {
{1 << DIR_SW | 1 << DIR_NE, 0, 1 << DIR_SW | 1 << DIR_NE, 0 }, /* X */
@@ -89,6 +186,72 @@ static byte DisallowedPPPofTrackBitAtPCP[TRACK_END][DIAGDIR_END] = {
{1 << DIR_S | 1 << DIR_N, 1 << DIR_S | 1 << DIR_N, 0, 0, }, /* RIGHT */
};
+/* This array stores which track bits can meet at a tile edge */
+static const Track PPPtracks[DIAGDIR_END][TRACKS_AT_PCP] = {
+ {TRACK_X, TRACK_X, TRACK_UPPER, TRACK_LOWER, TRACK_LEFT, TRACK_RIGHT},
+ {TRACK_Y, TRACK_Y, TRACK_UPPER, TRACK_LOWER, TRACK_LEFT, TRACK_RIGHT},
+ {TRACK_X, TRACK_X, TRACK_UPPER, TRACK_LOWER, TRACK_LEFT, TRACK_RIGHT},
+ {TRACK_Y, TRACK_Y, TRACK_UPPER, TRACK_LOWER, TRACK_LEFT, TRACK_RIGHT},
+};
+
+/* takes each of the 8 track bits from the array above and
+ assigns it to the home tile or neighbour tile */
+static const TileSource trackorigin[DIAGDIR_END][TRACKS_AT_PCP] = {
+ {TS_HOME, TS_NEIGHBOUR, TS_HOME , TS_NEIGHBOUR, TS_NEIGHBOUR, TS_HOME },
+ {TS_HOME, TS_NEIGHBOUR, TS_NEIGHBOUR, TS_HOME , TS_NEIGHBOUR, TS_HOME },
+ {TS_HOME, TS_NEIGHBOUR, TS_NEIGHBOUR, TS_HOME , TS_HOME , TS_NEIGHBOUR},
+ {TS_HOME, TS_NEIGHBOUR, TS_HOME , TS_NEIGHBOUR, TS_HOME , TS_NEIGHBOUR},
+};
+
+/* Several PPPs maybe exist, here they are sorted in order of preference. */
+static const Direction PPPorder[DIAGDIR_END][TLG_END][DIR_END] = { /* X - Y */
+ { /* PCP 0 */
+ {DIR_NE, DIR_NW, DIR_SE, DIR_SW, DIR_N, DIR_E, DIR_S, DIR_W}, /* evn - evn */
+ {DIR_NE, DIR_SE, DIR_SW, DIR_NW, DIR_S, DIR_W, DIR_N, DIR_E}, /* evn - odd */
+ {DIR_SW, DIR_NW, DIR_NE, DIR_SE, DIR_S, DIR_W, DIR_N, DIR_E}, /* odd - evn */
+ {DIR_SW, DIR_SE, DIR_NE, DIR_NW, DIR_N, DIR_E, DIR_S, DIR_W}, /* odd - odd */
+ }, {/* PCP 1 */
+ {DIR_NE, DIR_NW, DIR_SE, DIR_SW, DIR_S, DIR_E, DIR_N, DIR_W}, /* evn - evn */
+ {DIR_NE, DIR_SE, DIR_SW, DIR_NW, DIR_N, DIR_W, DIR_S, DIR_E}, /* evn - odd */
+ {DIR_SW, DIR_NW, DIR_NE, DIR_SE, DIR_N, DIR_W, DIR_S, DIR_E}, /* odd - evn */
+ {DIR_SW, DIR_SE, DIR_NE, DIR_NW, DIR_S, DIR_E, DIR_N, DIR_W}, /* odd - odd */
+ }, {/* PCP 2 */
+ {DIR_NE, DIR_NW, DIR_SE, DIR_SW, DIR_S, DIR_W, DIR_N, DIR_E}, /* evn - evn */
+ {DIR_NE, DIR_SE, DIR_SW, DIR_NW, DIR_N, DIR_E, DIR_S, DIR_W}, /* evn - odd */
+ {DIR_SW, DIR_NW, DIR_NE, DIR_SE, DIR_N, DIR_E, DIR_S, DIR_W}, /* odd - evn */
+ {DIR_SW, DIR_SE, DIR_NE, DIR_NW, DIR_S, DIR_W, DIR_N, DIR_E}, /* odd - odd */
+ }, {/* PCP 3 */
+ {DIR_NE, DIR_NW, DIR_SE, DIR_SW, DIR_N, DIR_W, DIR_S, DIR_E}, /* evn - evn */
+ {DIR_NE, DIR_SE, DIR_SW, DIR_NW, DIR_S, DIR_E, DIR_N, DIR_W}, /* evn - odd */
+ {DIR_SW, DIR_NW, DIR_NE, DIR_SE, DIR_S, DIR_E, DIR_N, DIR_W}, /* odd - evn */
+ {DIR_SW, DIR_SE, DIR_NE, DIR_NW, DIR_N, DIR_W, DIR_S, DIR_E}, /* odd - odd */
+ }
+};
+/* Geometric placement of the PCP relative to the tile origin */
+static const int8 x_pcp_offsets[DIAGDIR_END] = {0, 8, 15, 8};
+static const int8 y_pcp_offsets[DIAGDIR_END] = {8, 15, 8, 0};
+/* Geometric placement of the PPP relative to the PCP*/
+static const int8 x_ppp_offsets[DIR_END] = {-3, -4, -3, 0, +3, +4, +3, 0};
+static const int8 y_ppp_offsets[DIR_END] = {-3, 0, +3, +4, +3, 0, -3, -4};
+/* The type of pylon to draw at each PPP */
+static const SpriteID pylons_normal[] = {
+ SPR_PYLON_EW_N,
+ SPR_PYLON_Y_NE,
+ SPR_PYLON_NS_E,
+ SPR_PYLON_X_SE,
+ SPR_PYLON_EW_S,
+ SPR_PYLON_Y_SW,
+ SPR_PYLON_NS_W,
+ SPR_PYLON_X_NW
+};
+
+static const SpriteID pylons_bridge[] = {
+ SPR_PYLON_X_NW,
+ SPR_PYLON_X_SE,
+ SPR_PYLON_Y_NE,
+ SPR_PYLON_Y_SW
+};
+
typedef struct {
SpriteID image;
int8 x_offset;
@@ -237,82 +400,6 @@ typedef enum {
INVALID_CATENARY = 0xFF
} CatenarySprite;
-/* This array stores which track bits can meet at a tile edge */
-static const Track PPPtracks[DIAGDIR_END][TRACKS_AT_PCP] = {
- {TRACK_X, TRACK_X, TRACK_UPPER, TRACK_LOWER, TRACK_LEFT, TRACK_RIGHT},
- {TRACK_Y, TRACK_Y, TRACK_UPPER, TRACK_LOWER, TRACK_LEFT, TRACK_RIGHT},
- {TRACK_X, TRACK_X, TRACK_UPPER, TRACK_LOWER, TRACK_LEFT, TRACK_RIGHT},
- {TRACK_Y, TRACK_Y, TRACK_UPPER, TRACK_LOWER, TRACK_LEFT, TRACK_RIGHT},
-};
-
-/* takes each of the 8 track bits from the array above and
- assigns it to the home tile or neighbour tile */
-static const TileSource trackorigin[DIAGDIR_END][TRACKS_AT_PCP] = {
- {TS_HOME, TS_NEIGHBOUR, TS_HOME , TS_NEIGHBOUR, TS_NEIGHBOUR, TS_HOME },
- {TS_HOME, TS_NEIGHBOUR, TS_NEIGHBOUR, TS_HOME , TS_NEIGHBOUR, TS_HOME },
- {TS_HOME, TS_NEIGHBOUR, TS_NEIGHBOUR, TS_HOME , TS_HOME , TS_NEIGHBOUR},
- {TS_HOME, TS_NEIGHBOUR, TS_HOME , TS_NEIGHBOUR, TS_HOME , TS_NEIGHBOUR},
-};
-
-/* Several PPPs maybe exist, here they are sorted in order of preference. */
-static const Direction PPPorder[DIAGDIR_END][TLG_END][DIR_END] = { /* X - Y */
- { /* PCP 0 */
- {DIR_NE, DIR_NW, DIR_SE, DIR_SW, DIR_N, DIR_E, DIR_S, DIR_W}, /* evn - evn */
- {DIR_NE, DIR_SE, DIR_SW, DIR_NW, DIR_S, DIR_W, DIR_N, DIR_E}, /* evn - odd */
- {DIR_SW, DIR_NW, DIR_NE, DIR_SE, DIR_S, DIR_W, DIR_N, DIR_E}, /* odd - evn */
- {DIR_SW, DIR_SE, DIR_NE, DIR_NW, DIR_N, DIR_E, DIR_S, DIR_W}, /* odd - odd */
- }, {/* PCP 1 */
- {DIR_NE, DIR_NW, DIR_SE, DIR_SW, DIR_S, DIR_E, DIR_N, DIR_W}, /* evn - evn */
- {DIR_NE, DIR_SE, DIR_SW, DIR_NW, DIR_N, DIR_W, DIR_S, DIR_E}, /* evn - odd */
- {DIR_SW, DIR_NW, DIR_NE, DIR_SE, DIR_N, DIR_W, DIR_S, DIR_E}, /* odd - evn */
- {DIR_SW, DIR_SE, DIR_NE, DIR_NW, DIR_S, DIR_E, DIR_N, DIR_W}, /* odd - odd */
- }, {/* PCP 2 */
- {DIR_NE, DIR_NW, DIR_SE, DIR_SW, DIR_S, DIR_W, DIR_N, DIR_E}, /* evn - evn */
- {DIR_NE, DIR_SE, DIR_SW, DIR_NW, DIR_N, DIR_E, DIR_S, DIR_W}, /* evn - odd */
- {DIR_SW, DIR_NW, DIR_NE, DIR_SE, DIR_N, DIR_E, DIR_S, DIR_W}, /* odd - evn */
- {DIR_SW, DIR_SE, DIR_NE, DIR_NW, DIR_S, DIR_W, DIR_N, DIR_E}, /* odd - odd */
- }, {/* PCP 3 */
- {DIR_NE, DIR_NW, DIR_SE, DIR_SW, DIR_N, DIR_W, DIR_S, DIR_E}, /* evn - evn */
- {DIR_NE, DIR_SE, DIR_SW, DIR_NW, DIR_S, DIR_E, DIR_N, DIR_W}, /* evn - odd */
- {DIR_SW, DIR_NW, DIR_NE, DIR_SE, DIR_S, DIR_E, DIR_N, DIR_W}, /* odd - evn */
- {DIR_SW, DIR_SE, DIR_NE, DIR_NW, DIR_N, DIR_W, DIR_S, DIR_E}, /* odd - odd */
- }
-};
-/* Geometric placement of the PCP relative to the tile origin */
-static const int8 x_pcp_offsets[DIAGDIR_END] = {0, 8, 15, 8};
-static const int8 y_pcp_offsets[DIAGDIR_END] = {8, 15, 8, 0};
-/* Geometric placement of the PPP relative to the PCP*/
-static const int8 x_ppp_offsets[DIR_END] = {-3, -4, -3, 0, +3, +4, +3, 0};
-static const int8 y_ppp_offsets[DIR_END] = {-3, 0, +3, +4, +3, 0, -3, -4};
-/* The type of pylon to draw at each PPP */
-static const SpriteID pylons_normal[] = {
- SPR_PYLON_EW_N,
- SPR_PYLON_Y_NE,
- SPR_PYLON_NS_E,
- SPR_PYLON_X_SE,
- SPR_PYLON_EW_S,
- SPR_PYLON_Y_SW,
- SPR_PYLON_NS_W,
- SPR_PYLON_X_NW
-};
-
-static const SpriteID pylons_bridge[] = {
- SPR_PYLON_X_NW,
- SPR_PYLON_X_SE,
- SPR_PYLON_Y_NE,
- SPR_PYLON_Y_SW
-};
-
-/* Maps a track bit onto two PCP positions */
-static const byte PCPpositions[TRACK_END][2] = {
- {0, 2}, /* X */
- {1, 3}, /* Y */
- {3, 0}, /* UPPER */
- {1, 2}, /* LOWER */
- {2, 3}, /* LEFT */
- {0, 1}, /* RIGHT */
-};
-
/* Selects a Wire (with white and grey ends) depending on whether:
a) none (should never happen)
b) the first