slope.h
author rubidium
Tue, 22 Aug 2006 14:38:37 +0000
changeset 4344 7e123fec5b0b
parent 3636 a36cc46e754d
child 4666 172a0cdf28a6
permissions -rw-r--r--
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/* $Id$ */
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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