/* DE1: $Id: m_bams.h 1713 2004-05-31 15:04:44Z skyjake $
 * Copyright (C) 2003, 2004 Jaakko Keränen <jaakko.keranen@iki.fi>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not: http://www.opensource.org/
 */

/*
 * m_bams.h: Binary Angle Mathematics
 */

#ifndef __MY_BAMS_MATH_H__
#define __MY_BAMS_MATH_H__

#include "dd_types.h"

#if BAMS_BITS == 32

// Some predefined angles.
#define	BANG_0		0			   // To the east.
#define BANG_45		0x20000000	   // To the northeast.
#define BANG_90		0x40000000	   // To the north.
#define BANG_135	0x60000000	   // To the northwest.
#define BANG_180	0x80000000	   // To the west.
#define BANG_225	0xa0000000	   // To the southwest.
#define BANG_270	0xc0000000	   // To the south.
#define BANG_315	0xe0000000	   // To the southeast.
#define BANG_360	0x100000000	   // Actually the same as angle 0.
#define BANG_MAX	0xffffffff	   // The largest possible angle.

#elif BAMS_BITS == 16

// Some predefined angles.
#define	BANG_0		0			   // To the east.
#define BANG_45		0x2000		   // To the northeast.
#define BANG_90		0x4000		   // To the north.
#define BANG_135	0x6000		   // To the northwest.
#define BANG_180	0x8000		   // To the west.
#define BANG_225	0xa000		   // To the southwest.
#define BANG_270	0xc000		   // To the south.
#define BANG_315	0xe000		   // To the southeast.
#define BANG_360	0x10000		   // Actually the same than angle 0.
#define BANG_MAX	0xffff		   // The largest possible angle.

#else							// Byte-sized.

// Some predefined angles.
#define	BANG_0		0			   // To the east.
#define BANG_45		0x20		   // To the northeast.
#define BANG_90		0x40		   // To the north.
#define BANG_135	0x60		   // To the northwest.
#define BANG_180	0x80		   // To the west.
#define BANG_225	0xa0		   // To the southwest.
#define BANG_270	0xc0		   // To the south.
#define BANG_315	0xe0		   // To the southeast.
#define BANG_360	0x100		   // Actually the same than angle 0.
#define BANG_MAX	0xff		   // The largest possible angle.

#endif

#define BAMS_PI				3.14159265359
#define RAD2BANG(x)			((binangle_t)((x)/BAMS_PI*BANG_180))
#define BANG2RAD(x)			((float)((x)/(float)BANG_180*BAMS_PI))
#define BANG2DEG(x)			((float)((x)/(float)BANG_180*180))

// Compass directions, for convenience.
#define BANG_EAST		BANG_0
#define BANG_NORTHEAST	BANG_45
#define BANG_NORTH		BANG_90
#define BANG_NORTHWEST	BANG_135
#define BANG_WEST		BANG_180
#define BANG_SOUTHWEST	BANG_225
#define BANG_SOUTH		BANG_270
#define BANG_SOUTHEAST	BANG_315

void            bamsInit();		   // Fill in the tables.
binangle_t      bamsAtan2(int y, int x);

#endif