(svn r4281) -Cleanup: Begun cleaning up elrail code a bit, mostly comments and enum/array alignment
This commit is contained in:
celestar
26
elrail.c
26
elrail.c
@@ -1,6 +1,6 @@
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/* $Id$ */
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/** @file elrail.c
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* This file deals with displaying wires and pylons for electric railway systems.
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This file deals with displaying wires and pylons for electric railways.
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<h2>Basics</h2>
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<h3>Tile Types</h3>
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@@ -22,21 +22,23 @@ Group 3: Tiles with both an odd X and Y coordnate.
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<h4>Control Points</h4>
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A Pylon Control Point (PCP) is a position where a wire (or rather two)
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is mounted onto a pylon.
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Each NRT does contain 4 PCPs which are mapped to a byte
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variable and are represented by the DiagDirection enum:
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Each NRT does contain 4 PCPs which are bitmapped to a byte
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variable and are represented by the DiagDirection enum
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A wire that ends on the PCP has a dark ending, otherwise the end is bright.<p>
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Each track ends on two PCPs and thus requires one pylon on each end. However,
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there is one exception: Straight-and-level tracks only have one pylon every
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other tile.
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Now on each edge there are two PCPs: One from each adjacent tile. Both PCPs are merged
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using an OR matrix (i. e. if one tile needs a PCP at the postion in question, both
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tiles get it).
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Now on each edge there are two PCPs: One from each adjacent tile. Both PCPs
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are merged using an OR operation (i. e. if one tile needs a PCP at the postion
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in question, both tiles get it).
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<h4>Position Points</h4>
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A Pylon Position Point (PPP) is a position where a pylon is located on the ground.
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Each PCP owns 8 in (45 degree steps) PPPs that are located around it. PPPs are numbered
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0 to 7 with 0 starting north and numbering in clockwise direction. Each track bit has PPPs
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that are impossible (because the pylon would be situated on the track), preferred (because
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the pylon would be rectangular to the track). PPPs are represented by the Direction enum.
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A Pylon Position Point (PPP) is a position where a pylon is located on the
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ground. Each PCP owns 8 in (45 degree steps) PPPs that are located around
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it. PPPs are represented using the Direction enum. Each track bit has PPPs
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that are impossible (because the pylon would be situated on the track) and
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some that are preferred (because the pylon would be rectangular to the track).
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<img src="../../elrail_tile.png">
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<img src="../../elrail_track.png">
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@@ -1,10 +1,12 @@
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/* $Id */
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/** @file elrail_data.h Stores all the data for overhead wire and pylon drawing. @see elrail.c */
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/** @file elrail_data.h Stores all the data for overhead wire and pylon drawing.
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@see elrail.c */
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#ifndef ELRAIL_DATA_H
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#define ELRAIL_DATA_H
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/** Tile Location group. This defines whether the X and or Y coordinate of a tile is even */
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/** Tile Location group.
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This defines whether the X and or Y coordinate of a tile is even */
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typedef enum TLG {
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XEVEN_YEVEN = 0,
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XEVEN_YODD = 1,
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@@ -13,9 +15,9 @@ typedef enum TLG {
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TLG_END
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} TLG;
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/** When determining the pylon configuration on the edge, two tiles are taken into account:
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* the tile being drawn itself (the home tile, the one in ti->tile), and the neighbouring tile
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*/
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/** When determining the pylon configuration on the edge, two tiles are taken
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into account: the tile being drawn itself (the home tile, the one in
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ti->tile), and the neighbouring tile */
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typedef enum {
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TS_HOME = 0,
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TS_NEIGHBOUR = 1,
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@@ -29,55 +31,150 @@ enum {
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/** Which PPPs are possible at all on a given PCP */
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static byte AllowedPPPonPCP[DIAGDIR_END] = {
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1 << DIR_N | 1 << DIR_E | 1 << DIR_SE | 1 << DIR_S | 1 << DIR_W | 1 << DIR_NW,
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1 << DIR_N | 1 << DIR_NE | 1 << DIR_E | 1 << DIR_S | 1 << DIR_SW | 1 << DIR_W,
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1 << DIR_N | 1 << DIR_E | 1 << DIR_SE | 1 << DIR_S | 1 << DIR_W | 1 << DIR_NW,
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1 << DIR_N | 1 << DIR_NE | 1 << DIR_E | 1 << DIR_S | 1 << DIR_SW | 1 << DIR_W,
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1 << DIR_N | 1 << DIR_E | 1 << DIR_SE | 1 << DIR_S | 1 << DIR_W | 1 << DIR_NW,
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1 << DIR_N | 1 << DIR_NE | 1 << DIR_E | 1 << DIR_S | 1 << DIR_SW | 1 << DIR_W,
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1 << DIR_N | 1 << DIR_E | 1 << DIR_SE | 1 << DIR_S | 1 << DIR_W | 1 << DIR_NW,
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1 << DIR_N | 1 << DIR_NE | 1 << DIR_E | 1 << DIR_S | 1 << DIR_SW | 1 << DIR_W,
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};
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/** Which of the PPPs are inside the tile. For the two PPPs on the tile border the following system is used:
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if you rotate the PCP so that it is in the north, the eastern PPP belongs to the tile. */
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/** Which of the PPPs are inside the tile. For the two PPPs on the tile border
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the following system is used: if you rotate the PCP so that it is in the
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north, the eastern PPP belongs to the tile. */
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static byte OwnedPPPonPCP[DIAGDIR_END] = {
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1 << DIR_SE | 1 << DIR_S | 1 << DIR_SW | 1 << DIR_W,
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1 << DIR_N | 1 << DIR_SW | 1 << DIR_W | 1 << DIR_NW,
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1 << DIR_N | 1 << DIR_NE | 1 << DIR_E | 1 << DIR_NW,
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1 << DIR_NE | 1 << DIR_E | 1 << DIR_SE | 1 << DIR_S
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1 << DIR_SE | 1 << DIR_S | 1 << DIR_SW | 1 << DIR_W,
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1 << DIR_N | 1 << DIR_SW | 1 << DIR_W | 1 << DIR_NW,
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1 << DIR_N | 1 << DIR_NE | 1 << DIR_E | 1 << DIR_NW,
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1 << DIR_NE | 1 << DIR_E | 1 << DIR_SE | 1 << DIR_S
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};
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/** Preferred points of each trackbit. Those are the ones perpendicular to the track, plus the point in
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extension of the track (to mark end-of-track).*/
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/** Maps a track bit onto two PCP positions */
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static const DiagDirection PCPpositions[TRACK_END][2] = {
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{DIAGDIR_NE, DIAGDIR_SW}, /* X */
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{DIAGDIR_SE, DIAGDIR_NW}, /* Y */
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{DIAGDIR_NW, DIAGDIR_NE}, /* UPPER */
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{DIAGDIR_SE, DIAGDIR_SW}, /* LOWER */
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{DIAGDIR_SW, DIAGDIR_NW}, /* LEFT */
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{DIAGDIR_NE, DIAGDIR_SE}, /* RIGHT */
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};
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#define PCP_NOT_ON_TRACK 0xFF
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/** Preferred points of each trackbit. Those are the ones perpendicular to the
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track, plus the point in extension of the track (to mark end-of-track). PCPs
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which are not on either end of the track are fully preferred.
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@see PCPpositions */
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static byte PreferredPPPofTrackBitAtPCP[TRACK_END][DIAGDIR_END] = {
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{1 << DIR_NE | 1 << DIR_SE | 1 << DIR_NW, 0xFF, 1 << DIR_SE | 1 << DIR_SW | 1 << DIR_NW, 0xFF }, /* X */
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{0xFF, 1 << DIR_NE | 1 << DIR_SE | 1 << DIR_SW, 0xFF, 1 << DIR_SW | 1 << DIR_NW | 1 << DIR_NE }, /* Y */
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{1 << DIR_E | 1 << DIR_N | 1 << DIR_S, 0xFF, 0xFF, 1 << DIR_W | 1 << DIR_N | 1 << DIR_S}, /* UPPER */
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{0xFF, 1 << DIR_E | 1 << DIR_N | 1 << DIR_S, 1 << DIR_W | 1 << DIR_N | 1 << DIR_S, 0xFF}, /* LOWER */
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{0xFF, 0xFF, 1 << DIR_S | 1 << DIR_E | 1 << DIR_W, 1 << DIR_N | 1 << DIR_E | 1 << DIR_W}, /* LEFT */
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{1 << DIR_N | 1 << DIR_E | 1 << DIR_W, 1 << DIR_S | 1 << DIR_E | 1 << DIR_W, 0xFF, 0xFF}, /* RIGHT */
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};
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#define NUM_IGNORE_GROUPS 3
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/** In case we have a staight line, we place pylon only every two tiles, so there are certain tiles
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which we ignore. A straight line is found if we have exactly two preferred points.*/
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static byte IgnoredPCP[NUM_IGNORE_GROUPS][TLG_END][DIAGDIR_END] = {
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{
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{1 << DIR_N | 1 << DIR_S , 1 << DIR_NE | 1 << DIR_SW, 1 << DIR_NW | 1 << DIR_SE, 1 << DIR_W | 1 << DIR_E},
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{0xFF , 1 << DIR_E | 1 << DIR_W, 1 << DIR_NW | 1 << DIR_SE, 1 << DIR_NE | 1 << DIR_SW},
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{1 << DIR_NW | 1 << DIR_SE, 1 << DIR_NE | 1 << DIR_SW, 1 << DIR_N | 1 << DIR_S , 0xFF},
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{1 << DIR_NW | 1 << DIR_SE, 0xFF , 0xFF, 1 << DIR_NE | 1 << DIR_SW}
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},
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{
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{1 << DIR_E | 1 << DIR_W, 1 << DIR_N | 1 << DIR_S, 0xFF, 1 << DIR_E | 1 << DIR_W},
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{0xFF, 0xFF, 1 << DIR_N | 1 << DIR_S, 1 << DIR_N | 1 << DIR_S},
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{0xFF, 1 << DIR_E | 1 << DIR_W, 1 << DIR_E | 1 << DIR_W, 1 << DIR_N | 1 << DIR_S},
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{1 << DIR_N | 1 << DIR_S, 1 << DIR_N | 1 << DIR_S, 0xFF, 1 << DIR_E | 1 << DIR_W}
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},
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{
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{0xFF, 0xFF, 0xFF, 0xFF},
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{0xFF, 0xFF, 1 << DIR_E | 1 << DIR_W, 0xFF},
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{0xFF, 0xFF, 0xFF, 0xFF},
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{1 << DIR_E | 1 << DIR_W, 0xFF, 0xFF, 0xFF}
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{ /* X */
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1 << DIR_NE | 1 << DIR_SE | 1 << DIR_NW, /* NE */
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PCP_NOT_ON_TRACK, /* SE */
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1 << DIR_SE | 1 << DIR_SW | 1 << DIR_NW, /* SW */
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PCP_NOT_ON_TRACK /* NE */
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}, { /* Y */
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PCP_NOT_ON_TRACK,
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1 << DIR_NE | 1 << DIR_SE | 1 << DIR_SW,
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PCP_NOT_ON_TRACK,
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1 << DIR_SW | 1 << DIR_NW | 1 << DIR_NE
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}, { /* UPPER */
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1 << DIR_E | 1 << DIR_N | 1 << DIR_S,
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PCP_NOT_ON_TRACK,
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PCP_NOT_ON_TRACK,
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1 << DIR_W | 1 << DIR_N | 1 << DIR_S
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}, { /* LOWER */
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PCP_NOT_ON_TRACK,
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1 << DIR_E | 1 << DIR_N | 1 << DIR_S,
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1 << DIR_W | 1 << DIR_N | 1 << DIR_S,
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PCP_NOT_ON_TRACK
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}, { /* LEFT */
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PCP_NOT_ON_TRACK,
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PCP_NOT_ON_TRACK,
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1 << DIR_S | 1 << DIR_E | 1 << DIR_W,
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1 << DIR_N | 1 << DIR_E | 1 << DIR_W
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}, { /* RIGHT */
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1 << DIR_N | 1 << DIR_E | 1 << DIR_W,
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1 << DIR_S | 1 << DIR_E | 1 << DIR_W,
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PCP_NOT_ON_TRACK,
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PCP_NOT_ON_TRACK
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}
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};
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#undef PCP_NOT_ON_TRACK
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#define NUM_IGNORE_GROUPS 3
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#define NO_IGNORE 0xFF
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/** In case we have a staight line, we place pylon only every two tiles,
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so there are certain tiles which we ignore. A straight line is found if
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we have exactly two preferred points.*/
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static byte IgnoredPCP[NUM_IGNORE_GROUPS][TLG_END][DIAGDIR_END] = {
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{ /* Ignore group 1 */
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{ /* X even, Y even */
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1 << DIR_N | 1 << DIR_S,
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1 << DIR_NE | 1 << DIR_SW,
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1 << DIR_NW | 1 << DIR_SE,
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1 << DIR_W | 1 << DIR_E
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}, { /* X even, Y odd */
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0xFF,
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1 << DIR_E | 1 << DIR_W,
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1 << DIR_NW | 1 << DIR_SE,
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1 << DIR_NE | 1 << DIR_SW
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}, { /* X odd, Y even */
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1 << DIR_NW | 1 << DIR_SE,
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1 << DIR_NE | 1 << DIR_SW,
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1 << DIR_N | 1 << DIR_S ,
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0xFF
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}, { /* X odd, Y odd */
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1 << DIR_NW | 1 << DIR_SE,
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0xFF,
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0xFF,
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1 << DIR_NE | 1 << DIR_SW
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}
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},
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{ /* Ignore group 2 */
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{
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1 << DIR_E | 1 << DIR_W,
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1 << DIR_N | 1 << DIR_S,
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0xFF,
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1 << DIR_E | 1 << DIR_W
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}, {
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0xFF,
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0xFF,
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1 << DIR_N | 1 << DIR_S,
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1 << DIR_N | 1 << DIR_S
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}, {
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0xFF,
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1 << DIR_E | 1 << DIR_W,
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1 << DIR_E | 1 << DIR_W,
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1 << DIR_N | 1 << DIR_S
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}, {
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1 << DIR_N | 1 << DIR_S,
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1 << DIR_N | 1 << DIR_S,
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0xFF,
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1 << DIR_E | 1 << DIR_W
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}
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},
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{ /* Ignore group 3 */
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{
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0xFF,
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0xFF,
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0xFF,
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0xFF
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}, {
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0xFF,
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0xFF,
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1 << DIR_E | 1 << DIR_W,
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0xFF
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}, {
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0xFF,
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0xFF,
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0xFF,
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0xFF
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}, {
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1 << DIR_E | 1 << DIR_W,
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0xFF,
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0xFF,
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0xFF
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}
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}
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};
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#undef NO_IGNORE
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/** Which pylons can definately NOT be built */
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static byte DisallowedPPPofTrackBitAtPCP[TRACK_END][DIAGDIR_END] = {
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@@ -89,6 +186,72 @@ static byte DisallowedPPPofTrackBitAtPCP[TRACK_END][DIAGDIR_END] = {
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{1 << DIR_S | 1 << DIR_N, 1 << DIR_S | 1 << DIR_N, 0, 0, }, /* RIGHT */
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};
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/* This array stores which track bits can meet at a tile edge */
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static const Track PPPtracks[DIAGDIR_END][TRACKS_AT_PCP] = {
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{TRACK_X, TRACK_X, TRACK_UPPER, TRACK_LOWER, TRACK_LEFT, TRACK_RIGHT},
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{TRACK_Y, TRACK_Y, TRACK_UPPER, TRACK_LOWER, TRACK_LEFT, TRACK_RIGHT},
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{TRACK_X, TRACK_X, TRACK_UPPER, TRACK_LOWER, TRACK_LEFT, TRACK_RIGHT},
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{TRACK_Y, TRACK_Y, TRACK_UPPER, TRACK_LOWER, TRACK_LEFT, TRACK_RIGHT},
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};
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/* takes each of the 8 track bits from the array above and
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assigns it to the home tile or neighbour tile */
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static const TileSource trackorigin[DIAGDIR_END][TRACKS_AT_PCP] = {
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{TS_HOME, TS_NEIGHBOUR, TS_HOME , TS_NEIGHBOUR, TS_NEIGHBOUR, TS_HOME },
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{TS_HOME, TS_NEIGHBOUR, TS_NEIGHBOUR, TS_HOME , TS_NEIGHBOUR, TS_HOME },
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{TS_HOME, TS_NEIGHBOUR, TS_NEIGHBOUR, TS_HOME , TS_HOME , TS_NEIGHBOUR},
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{TS_HOME, TS_NEIGHBOUR, TS_HOME , TS_NEIGHBOUR, TS_HOME , TS_NEIGHBOUR},
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};
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/* Several PPPs maybe exist, here they are sorted in order of preference. */
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static const Direction PPPorder[DIAGDIR_END][TLG_END][DIR_END] = { /* X - Y */
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{ /* PCP 0 */
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{DIR_NE, DIR_NW, DIR_SE, DIR_SW, DIR_N, DIR_E, DIR_S, DIR_W}, /* evn - evn */
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{DIR_NE, DIR_SE, DIR_SW, DIR_NW, DIR_S, DIR_W, DIR_N, DIR_E}, /* evn - odd */
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{DIR_SW, DIR_NW, DIR_NE, DIR_SE, DIR_S, DIR_W, DIR_N, DIR_E}, /* odd - evn */
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{DIR_SW, DIR_SE, DIR_NE, DIR_NW, DIR_N, DIR_E, DIR_S, DIR_W}, /* odd - odd */
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}, {/* PCP 1 */
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{DIR_NE, DIR_NW, DIR_SE, DIR_SW, DIR_S, DIR_E, DIR_N, DIR_W}, /* evn - evn */
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{DIR_NE, DIR_SE, DIR_SW, DIR_NW, DIR_N, DIR_W, DIR_S, DIR_E}, /* evn - odd */
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{DIR_SW, DIR_NW, DIR_NE, DIR_SE, DIR_N, DIR_W, DIR_S, DIR_E}, /* odd - evn */
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{DIR_SW, DIR_SE, DIR_NE, DIR_NW, DIR_S, DIR_E, DIR_N, DIR_W}, /* odd - odd */
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}, {/* PCP 2 */
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{DIR_NE, DIR_NW, DIR_SE, DIR_SW, DIR_S, DIR_W, DIR_N, DIR_E}, /* evn - evn */
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{DIR_NE, DIR_SE, DIR_SW, DIR_NW, DIR_N, DIR_E, DIR_S, DIR_W}, /* evn - odd */
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{DIR_SW, DIR_NW, DIR_NE, DIR_SE, DIR_N, DIR_E, DIR_S, DIR_W}, /* odd - evn */
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{DIR_SW, DIR_SE, DIR_NE, DIR_NW, DIR_S, DIR_W, DIR_N, DIR_E}, /* odd - odd */
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}, {/* PCP 3 */
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{DIR_NE, DIR_NW, DIR_SE, DIR_SW, DIR_N, DIR_W, DIR_S, DIR_E}, /* evn - evn */
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{DIR_NE, DIR_SE, DIR_SW, DIR_NW, DIR_S, DIR_E, DIR_N, DIR_W}, /* evn - odd */
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{DIR_SW, DIR_NW, DIR_NE, DIR_SE, DIR_S, DIR_E, DIR_N, DIR_W}, /* odd - evn */
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{DIR_SW, DIR_SE, DIR_NE, DIR_NW, DIR_N, DIR_W, DIR_S, DIR_E}, /* odd - odd */
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}
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};
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/* Geometric placement of the PCP relative to the tile origin */
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static const int8 x_pcp_offsets[DIAGDIR_END] = {0, 8, 15, 8};
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static const int8 y_pcp_offsets[DIAGDIR_END] = {8, 15, 8, 0};
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/* Geometric placement of the PPP relative to the PCP*/
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static const int8 x_ppp_offsets[DIR_END] = {-3, -4, -3, 0, +3, +4, +3, 0};
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static const int8 y_ppp_offsets[DIR_END] = {-3, 0, +3, +4, +3, 0, -3, -4};
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/* The type of pylon to draw at each PPP */
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static const SpriteID pylons_normal[] = {
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SPR_PYLON_EW_N,
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SPR_PYLON_Y_NE,
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SPR_PYLON_NS_E,
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SPR_PYLON_X_SE,
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SPR_PYLON_EW_S,
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SPR_PYLON_Y_SW,
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SPR_PYLON_NS_W,
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SPR_PYLON_X_NW
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};
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|
||||
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
|
||||
|
||||
Reference in New Issue
Block a user