Difference between revisions of "NML:List of tile slopes"

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<br />[[Image:NML tileh.png|frame|left|tile slopes]]
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Revision as of 12:09, 21 August 2011

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


tile slopes