File content as of revision 2:1c1f7677ac17:

/***************************************************************************
 * STM32 VGA demo
 * Copyright (C) 2012 Artekit Italy
 * http://www.artekit.eu
 * Written by Ruben H. Meleca
 
### mth.c
 
#   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, write to the Free Software
#   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

***************************************************************************/

#include "mth.h"

static const i16 SineTable[360] = 
				{
					     0,    174,    348,    523,    697,    871,   1045,   1218,   1391, 
					  1564,   1736,   1908,   2079,   2249,   2419,   2588,   2756,   2923, 
					  3090,   3255,   3420,   3583,   3746,   3907,   4067,   4226,   4383, 
					  4539,   4694,   4848,   4999,   5150,   5299,   5446,   5591,   5735, 
					  5877,   6018,   6156,   6293,   6427,   6560,   6691,   6819,   6946, 
					  7071,   7193,   7313,   7431,   7547,   7660,   7771,   7880,   7986, 
					  8090,   8191,   8290,   8386,   8480,   8571,   8660,   8746,   8829, 
					  8910,   8987,   9063,   9135,   9205,   9271,   9335,   9396,   9455, 
					  9510,   9563,   9612,   9659,   9702,   9743,   9781,   9816,   9848, 
					  9876,   9902,   9925,   9945,   9961,   9975,   9986,   9993,   9998, 
					 10000,   9998,   9993,   9986,   9975,   9961,   9945,   9925,   9902, 
					  9876,   9848,   9816,   9781,   9743,   9702,   9659,   9612,   9563, 
					  9510,   9455,   9396,   9335,   9271,   9205,   9135,   9063,   8987, 
					  8910,   8829,   8746,   8660,   8571,   8480,   8386,   8290,   8191, 
					  8090,   7986,   7880,   7771,   7660,   7547,   7431,   7313,   7193, 
					  7071,   6946,   6819,   6691,   6560,   6427,   6293,   6156,   6018, 
					  5877,   5735,   5591,   5446,   5299,   5150,   5000,   4848,   4694, 
					  4539,   4383,   4226,   4067,   3907,   3746,   3583,   3420,   3255, 
					  3090,   2923,   2756,   2588,   2419,   2249,   2079,   1908,   1736, 
					  1564,   1391,   1218,   1045,    871,    697,    523,    348,    174, 
					     0,   -174,   -348,   -523,   -697,   -871,  -1045,  -1218,  -1391, 
					 -1564,  -1736,  -1908,  -2079,  -2249,  -2419,  -2588,  -2756,  -2923, 
					 -3090,  -3255,  -3420,  -3583,  -3746,  -3907,  -4067,  -4226,  -4383, 
					 -4539,  -4694,  -4848,  -4999,  -5150,  -5299,  -5446,  -5591,  -5735, 
					 -5877,  -6018,  -6156,  -6293,  -6427,  -6560,  -6691,  -6819,  -6946, 
					 -7071,  -7193,  -7313,  -7431,  -7547,  -7660,  -7771,  -7880,  -7986, 
					 -8090,  -8191,  -8290,  -8386,  -8480,  -8571,  -8660,  -8746,  -8829, 
					 -8910,  -8987,  -9063,  -9135,  -9205,  -9271,  -9335,  -9396,  -9455, 
					 -9510,  -9563,  -9612,  -9659,  -9702,  -9743,  -9781,  -9816,  -9848, 
					 -9876,  -9902,  -9925,  -9945,  -9961,  -9975,  -9986,  -9993,  -9998, 
					-10000,  -9998,  -9993,  -9986,  -9975,  -9961,  -9945,  -9925,  -9902, 
					 -9876,  -9848,  -9816,  -9781,  -9743,  -9702,  -9659,  -9612,  -9563, 
					 -9510,  -9455,  -9396,  -9335,  -9271,  -9205,  -9135,  -9063,  -8987, 
					 -8910,  -8829,  -8746,  -8660,  -8571,  -8480,  -8386,  -8290,  -8191, 
					 -8090,  -7986,  -7880,  -7771,  -7660,  -7547,  -7431,  -7313,  -7193, 
					 -7071,  -6946,  -6819,  -6691,  -6560,  -6427,  -6293,  -6156,  -6018, 
					 -5877,  -5735,  -5591,  -5446,  -5299,  -5150,  -5000,  -4848,  -4694, 
					 -4539,  -4383,  -4226,  -4067,  -3907,  -3746,  -3583,  -3420,  -3255, 
					 -3090,  -2923,  -2756,  -2588,  -2419,  -2249,  -2079,  -1908,  -1736, 
					 -1564,  -1391,  -1218,  -1045,   -871,   -697,   -523,   -348,   -174
				}; 

//*****************************************************************************
//	Function mthSine(u16 angle)
//
//	Return sine value from 'angle' parameter in degrees. The returned value
//	is multiplied by 10000 (-10000..0..10000). The angle must be an integer
//	value from 0 to 359.
//
//	parameters:
//		angle		Angle value in degrees
//
//	return:			Sine
//*****************************************************************************
i16	mthSin(u16 angle)
{
	u16	a = (angle % 359);

	return SineTable[a];
}

//*****************************************************************************
//	Function mthCos(u16 angle)
//
//	Return cosine value from 'angle' parameter in degrees. The returned
//	value is multiplied by 10000 (-10000..0..10000). The angle must be an
//	integer value from 0 to 359
//
//	parameters:
//		angle		Angle value in degrees
//
//	return:			Cosine
//*****************************************************************************
i16	mthCos(u16 angle)
{
	u16	a = ((angle + 90) % 359);

	return SineTable[a];
}