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/*
** mathlib.c
** Mathematics library to LUA
*/
char *rcs_mathlib="$Id: mathlib.c,v 1.15 1996/04/22 18:00:37 roberto Exp roberto $";
#include <stdlib.h>
#include <math.h>
#include "lualib.h"
#include "lua.h"
#ifndef PI
#define PI 3.14159265358979323846
#endif
#define TODEGREE(a) ((a)*180.0/PI)
#define TORAD(a) ((a)*PI/180.0)
static void math_abs (void)
{
double d = lua_check_number(1, "abs");
if (d < 0) d = -d;
lua_pushnumber (d);
}
static void math_sin (void)
{
double d = lua_check_number(1, "sin");
lua_pushnumber (sin(TORAD(d)));
}
static void math_cos (void)
{
double d = lua_check_number(1, "cos");
lua_pushnumber (cos(TORAD(d)));
}
static void math_tan (void)
{
double d = lua_check_number(1, "tan");
lua_pushnumber (tan(TORAD(d)));
}
static void math_asin (void)
{
double d = lua_check_number(1, "asin");
lua_pushnumber (TODEGREE(asin(d)));
}
static void math_acos (void)
{
double d = lua_check_number(1, "acos");
lua_pushnumber (TODEGREE(acos(d)));
}
static void math_atan (void)
{
double d = lua_check_number(1, "atan");
lua_pushnumber (TODEGREE(atan(d)));
}
static void math_atan2 (void)
{
double d1 = lua_check_number(1, "atan2");
double d2 = lua_check_number(2, "atan2");
lua_pushnumber (TODEGREE(atan2(d1, d2)));
}
static void math_ceil (void)
{
double d = lua_check_number(1, "ceil");
lua_pushnumber (ceil(d));
}
static void math_floor (void)
{
double d = lua_check_number(1, "floor");
lua_pushnumber (floor(d));
}
static void math_mod (void)
{
int d1 = (int)lua_check_number(1, "mod");
int d2 = (int)lua_check_number(2, "mod");
lua_pushnumber (d1%d2);
}
static void math_sqrt (void)
{
double d = lua_check_number(1, "sqrt");
lua_pushnumber (sqrt(d));
}
static int old_pow;
static void math_pow (void)
{
lua_Object o1 = lua_getparam (1);
lua_Object o2 = lua_getparam (2);
lua_Object op = lua_getparam(3);
if (!lua_isnumber(o1) || !lua_isnumber(o2) || *(lua_getstring(op)) != 'p')
{
lua_Object old = lua_getref(old_pow);
lua_pushobject(o1);
lua_pushobject(o2);
lua_pushobject(op);
if (lua_callfunction(old) != 0)
lua_error(NULL);
}
else
{
double d1 = lua_getnumber(o1);
double d2 = lua_getnumber(o2);
lua_pushnumber (pow(d1,d2));
}
}
static void math_min (void)
{
int i=1;
double dmin = lua_check_number(i, "min");
while (lua_getparam(++i) != LUA_NOOBJECT)
{
double d = lua_check_number(i, "min");
if (d < dmin) dmin = d;
}
lua_pushnumber (dmin);
}
static void math_max (void)
{
int i=1;
double dmax = lua_check_number(i, "max");
while (lua_getparam(++i) != LUA_NOOBJECT)
{
double d = lua_check_number(i, "max");
if (d > dmax) dmax = d;
}
lua_pushnumber (dmax);
}
static void math_log (void)
{
double d = lua_check_number(1, "log");
lua_pushnumber (log(d));
}
static void math_log10 (void)
{
double d = lua_check_number(1, "log10");
lua_pushnumber (log10(d));
}
static void math_exp (void)
{
double d = lua_check_number(1, "exp");
lua_pushnumber (exp(d));
}
static void math_deg (void)
{
float d = lua_check_number(1, "deg");
lua_pushnumber (d*180./PI);
}
static void math_rad (void)
{
float d = lua_check_number(1, "rad");
lua_pushnumber (d/180.*PI);
}
static void math_random (void)
{
lua_pushnumber((double)(rand()%RAND_MAX) / (double)RAND_MAX);
}
static void math_randomseed (void)
{
srand(lua_check_number(1, "randomseed"));
}
/*
** Open math library
*/
void mathlib_open (void)
{
lua_register ("abs", math_abs);
lua_register ("sin", math_sin);
lua_register ("cos", math_cos);
lua_register ("tan", math_tan);
lua_register ("asin", math_asin);
lua_register ("acos", math_acos);
lua_register ("atan", math_atan);
lua_register ("atan2", math_atan2);
lua_register ("ceil", math_ceil);
lua_register ("floor", math_floor);
lua_register ("mod", math_mod);
lua_register ("sqrt", math_sqrt);
lua_register ("min", math_min);
lua_register ("max", math_max);
lua_register ("log", math_log);
lua_register ("log10", math_log10);
lua_register ("exp", math_exp);
lua_register ("deg", math_deg);
lua_register ("rad", math_rad);
lua_register ("random", math_random);
lua_register ("randomseed", math_randomseed);
old_pow = lua_refobject(lua_setfallback("arith", math_pow), 1);
}
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