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42 lines
1.0 KiB
C
42 lines
1.0 KiB
C
/* $Id$ */
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#ifndef SLOPE_H
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#define SLOPE_H
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typedef enum Slope {
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SLOPE_FLAT = 0x00,
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SLOPE_W = 0x01,
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SLOPE_S = 0x02,
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SLOPE_E = 0x04,
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SLOPE_N = 0x08,
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SLOPE_STEEP = 0x10,
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SLOPE_NW = SLOPE_N | SLOPE_W,
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SLOPE_SW = SLOPE_S | SLOPE_W,
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SLOPE_SE = SLOPE_S | SLOPE_E,
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SLOPE_NE = SLOPE_N | SLOPE_E,
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SLOPE_EW = SLOPE_E | SLOPE_W,
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SLOPE_NS = SLOPE_N | SLOPE_S,
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SLOPE_ELEVATED = SLOPE_N | SLOPE_E | SLOPE_S | SLOPE_W,
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SLOPE_NWS = SLOPE_N | SLOPE_W | SLOPE_S,
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SLOPE_WSE = SLOPE_W | SLOPE_S | SLOPE_E,
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SLOPE_SEN = SLOPE_S | SLOPE_E | SLOPE_N,
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SLOPE_ENW = SLOPE_E | SLOPE_N | SLOPE_W,
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SLOPE_STEEP_W = SLOPE_STEEP | SLOPE_NWS,
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SLOPE_STEEP_S = SLOPE_STEEP | SLOPE_WSE,
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SLOPE_STEEP_E = SLOPE_STEEP | SLOPE_SEN,
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SLOPE_STEEP_N = SLOPE_STEEP | SLOPE_ENW
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} Slope;
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static inline bool IsSteepSlope(Slope s)
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{
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return (s & SLOPE_STEEP) != 0;
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}
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static inline Slope ComplementSlope(Slope s)
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{
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assert(!IsSteepSlope(s));
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return (Slope)(0xF ^ s);
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}
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#endif /* SLOPE_H */
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