arith.h

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/* $Id$ $Revision$ */
/* vim:set shiftwidth=4 ts=8: */

/*************************************************************************
 * Copyright (c) 2011 AT&T Intellectual Property 
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors: See CVS logs. Details at http://www.graphviz.org/
 *************************************************************************/

/* geometric functions (e.g. on points and boxes) with application to, but
 * no specific dependence on graphs */

#ifndef GV_ARITH_H
#define GV_ARITH_H

/* for sincos */
#ifndef _GNU_SOURCE
#define _GNU_SOURCE 1
#endif

#include <limits.h>
#include <math.h>

#ifdef __cplusplus
extern "C" {
#endif

#ifdef MIN
#undef MIN
#endif
#define MIN(a,b)        ((a)<(b)?(a):(b))

#ifdef MAX
#undef MAX
#endif
#define MAX(a,b)        ((a)>(b)?(a):(b))

#ifdef ABS
#undef ABS
#endif
#define ABS(a)          ((a) >= 0 ? (a) : -(a))

#define AVG(a,b)        ((a + b) / 2)
#define SGN(a)          (((a)<0)? -1 : 1)
#define CMP(a,b)        (((a)<(b)) ? -1 : (((a)>(b)) ? 1 : 0))

#ifndef INT_MAX
#define INT_MAX         ((int)(~(unsigned)0 >> 1))
#endif

#ifndef INT_MIN
#define INT_MIN         (-INT_MAX - 1)
#endif

#ifndef MAXSHORT
#define MAXSHORT        (0x7fff)
#endif

#ifndef MAXDOUBLE
#define MAXDOUBLE       1.7976931348623157e+308
#endif

#ifndef MAXFLOAT
#define MAXFLOAT        ((float)3.40282347e+38)
#endif

#ifdef BETWEEN
#undef BETWEEN
#endif
#define BETWEEN(a,b,c)  (((a) <= (b)) && ((b) <= (c)))

#ifndef M_PI
#define M_PI            3.14159265358979323846
#endif

#ifndef SQRT2
#define SQRT2           1.41421356237309504880
#endif

#define ROUND(f)        ((f>=0)?(int)(f + .5):(int)(f - .5))
#define RADIANS(deg)    ((deg)/180.0 * M_PI)
#define DEGREES(rad)    ((rad)/M_PI * 180.0)

#define SQR(a) ((a) * (a))

#ifdef HAVE_SINCOS
    extern void sincos(double x, double *s, double *c);
#else
# define sincos(x,s,c) *s = sin(x); *c = cos(x)
#endif

#ifdef __cplusplus
}
#endif

#endif