NML:List of tile slopes
Vehicles, Stations, Canals, Bridges, Towns, Houses, Industries (Tiles), Cargos, Airports+Tiles, Objects, Railtypes, Roadtypes, Tramtypes, Terrain
Tiles in TTD can have various slopes. The slope is a bitmask that may contain the following bits:
| bit flag | meaning |
|---|---|
| CORNER_W | west corner is above the lowest corner. |
| CORNER_S | south corner is above the lowest corner. |
| CORNER_E | east corner is above the lowest corner. |
| CORNER_N | north corner is above the lowest corner. |
| IS_STEEP_SLOPE | this tile is a steep slope (the corner opposite to the lowest corner is 2 units higher). |
The resulting, possible values of this bitmask are given in the following table. The image below that illustrates them graphically. See also the builtin function num_corners_raised(slope).
Sprites for slopes are always in the same order in TTD. For example, GROUND_SPRITE_NORMAL is the sprite number of a flat grass tile. It is followed by 18 other sprites, that display a flat grass tile for each possible slope. The order of these sprites is given in the last column of the table. The builtin function slope_to_sprite_offset(slope) can be used to determine the sprite offset of a given slope.
| Named constant | Equivalent bitmask | Numerical value | Sprite offset |
|---|---|---|---|
| SLOPE_FLAT | bitmask()
|
0 | 0 |
| SLOPE_W | bitmask(CORNER_W)
|
1 | 1 |
| SLOPE_S | bitmask(CORNER_S)
|
2 | 2 |
| SLOPE_E | bitmask(CORNER_E)
|
4 | 4 |
| SLOPE_N | bitmask(CORNER_N)
|
8 | 8 |
| SLOPE_NW | bitmask(CORNER_N, CORNER_W)
|
9 | 9 |
| SLOPE_SW | bitmask(CORNER_S, CORNER_W)
|
3 | 3 |
| SLOPE_SE | bitmask(CORNER_S, CORNER_E)
|
6 | 6 |
| SLOPE_NE | bitmask(CORNER_N, CORNER_E)
|
12 | 12 |
| SLOPE_EW | bitmask(CORNER_E, CORNER_W)
|
5 | 5 |
| SLOPE_NS | bitmask(CORNER_N, CORNER_S)
|
10 | 10 |
| SLOPE_NWS | bitmask(CORNER_N, CORNER_W, CORNER_S)
|
11 | 11 |
| SLOPE_WSE | bitmask(CORNER_W, CORNER_S, CORNER_E)
|
7 | 7 |
| SLOPE_SEN | bitmask(CORNER_S, CORNER_E, CORNER_N)
|
14 | 14 |
| SLOPE_ENW | bitmask(CORNER_E, CORNER_N, CORNER_W)
|
13 | 13 |
| SLOPE_STEEP_W | bitmask(CORNER_N, CORNER_W, CORNER_S, IS_STEEP_SLOPE)
|
27 | 17 |
| SLOPE_STEEP_S | bitmask(CORNER_W, CORNER_S, CORNER_E, IS_STEEP_SLOPE)
|
23 | 16 |
| SLOPE_STEEP_E | bitmask(CORNER_S, CORNER_E, CORNER_N, IS_STEEP_SLOPE)
|
30 | 18 |
| SLOPE_STEEP_N | bitmask(CORNER_E, CORNER_N, CORNER_W, IS_STEEP_SLOPE)
|
29 | 15 |
