defs.c

/*
    C-Dogs SDL
    A port of the legendary (and fun) action/arcade cdogs.
    Copyright (C) 1995 Ronny Wester
    Copyright (C) 2003 Jeremy Chin 
    Copyright (C) 2003-2007 Lucas Martin-King 

    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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

-------------------------------------------------------------------------------

 defs.c - definitions
 
 Author: $Author: lmartinking $
 Rev:    $Revision: 250 $
 URL:    $HeadURL: svn://svn.icculus.org/cdogs-sdl/trunk/src/defs.c $
 ID:     $Id: defs.c 250 2007-07-06 16:38:43Z lmartinking $
 
*/

#include "defs.h"


int cmd2dir[16] = {
	0,			// Nothing
	DIRECTION_LEFT,		// CMD_LEFT
	DIRECTION_RIGHT,	// CMD_RIGHT
	0,			// CMD_LEFT + CMD_RIGHT
	DIRECTION_UP,		// CMD_UP
	DIRECTION_UPLEFT,	// CMD_UP + CMD_LEFT
	DIRECTION_UPRIGHT,	// CMD_UP + CMD_RIGHT
	0,			// CMD_UP + CMD_LEFT + CMD_RIGHT
	DIRECTION_DOWN,		// CMD_DOWN
	DIRECTION_DOWNLEFT,	// CMD_DOWN + CMD_LEFT
	DIRECTION_DOWNRIGHT,	// CMD_DOWN + CMD_RIGHT
	0,			// CMD_DOWN + CMD_LEFT + CMD_RIGHT
	0,			// CMD_UP + CMD_DOWN
	0,			// CMD_UP + CMD_DOWN + CMD_LEFT
	0,			// CMD_UP + CMD_DOWN + CMD_RIGHT
	0			// CMD_UP + CMD_DOWN + CMD_LEFT + CMD_RIGHT
};

int dir2cmd[8] = {
	CMD_UP,
	CMD_UP + CMD_RIGHT,
	CMD_RIGHT,
	CMD_DOWN + CMD_RIGHT,
	CMD_DOWN,
	CMD_DOWN + CMD_LEFT,
	CMD_LEFT,
	CMD_UP + CMD_LEFT
};

int dir2angle[8] = {
	192,
	224,
	0,
	32,
	64,
	96,
	128,
	160
};

static int cSinus[65] = {
	0, 6, 12, 18, 25, 31, 37, 43,
	49, 56, 62, 68, 74, 80, 86, 92,
	97, 103, 109, 115, 120, 126, 131, 136,
	142, 147, 152, 157, 162, 167, 171, 176,
	181, 185, 189, 193, 197, 201, 205, 209,
	212, 216, 219, 222, 225, 228, 231, 234,
	236, 238, 241, 243, 244, 246, 248, 249,
	251, 252, 253, 254, 254, 255, 255, 255,
	256
};


void GetVectorsForAngle(int angle, int *dx, int *dy)
{
	if (angle <= 64) {
		*dx = cSinus[64 - angle];
		*dy = cSinus[angle];
	} else if (angle <= 128) {
		*dx = -cSinus[angle - 64];
		*dy = cSinus[128 - angle];
	} else if (angle <= 192) {
		*dx = -cSinus[192 - angle];
		*dy = -cSinus[angle - 128];
	} else {
		*dx = cSinus[angle - 192];
		*dy = -cSinus[256 - angle];
	}
	*dy *= 3;
	*dy /= 4;
}