lua/lmathlib.c

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/*
** $Id: lmathlib.c,v 1.32 2000/10/31 13:10:24 roberto Exp roberto $
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** Standard mathematical library
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** See Copyright Notice in lua.h
*/
#include <stdlib.h>
#include <math.h>
#include "lua.h"
#include "lauxlib.h"
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#include "lualib.h"
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#undef PI
#define PI (3.14159265358979323846)
#define RADIANS_PER_DEGREE (PI/180.0)
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/*
** If you want Lua to operate in radians (instead of degrees),
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** define RADIANS
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*/
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#ifdef RADIANS
#define FROMRAD(a) (a)
#define TORAD(a) (a)
#else
#define FROMRAD(a) ((a)/RADIANS_PER_DEGREE)
#define TORAD(a) ((a)*RADIANS_PER_DEGREE)
#endif
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static int math_abs (lua_State *L) {
lua_pushnumber(L, fabs(luaL_check_number(L, 1)));
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return 1;
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}
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static int math_sin (lua_State *L) {
lua_pushnumber(L, sin(TORAD(luaL_check_number(L, 1))));
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return 1;
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}
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static int math_cos (lua_State *L) {
lua_pushnumber(L, cos(TORAD(luaL_check_number(L, 1))));
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return 1;
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}
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static int math_tan (lua_State *L) {
lua_pushnumber(L, tan(TORAD(luaL_check_number(L, 1))));
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return 1;
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}
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static int math_asin (lua_State *L) {
lua_pushnumber(L, FROMRAD(asin(luaL_check_number(L, 1))));
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return 1;
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}
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static int math_acos (lua_State *L) {
lua_pushnumber(L, FROMRAD(acos(luaL_check_number(L, 1))));
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return 1;
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}
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static int math_atan (lua_State *L) {
lua_pushnumber(L, FROMRAD(atan(luaL_check_number(L, 1))));
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return 1;
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}
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static int math_atan2 (lua_State *L) {
lua_pushnumber(L, FROMRAD(atan2(luaL_check_number(L, 1), luaL_check_number(L, 2))));
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return 1;
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}
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static int math_ceil (lua_State *L) {
lua_pushnumber(L, ceil(luaL_check_number(L, 1)));
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return 1;
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}
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static int math_floor (lua_State *L) {
lua_pushnumber(L, floor(luaL_check_number(L, 1)));
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return 1;
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}
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static int math_mod (lua_State *L) {
lua_pushnumber(L, fmod(luaL_check_number(L, 1), luaL_check_number(L, 2)));
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return 1;
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}
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static int math_sqrt (lua_State *L) {
lua_pushnumber(L, sqrt(luaL_check_number(L, 1)));
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return 1;
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}
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static int math_pow (lua_State *L) {
lua_pushnumber(L, pow(luaL_check_number(L, 1), luaL_check_number(L, 2)));
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return 1;
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}
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static int math_log (lua_State *L) {
lua_pushnumber(L, log(luaL_check_number(L, 1)));
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return 1;
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}
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static int math_log10 (lua_State *L) {
lua_pushnumber(L, log10(luaL_check_number(L, 1)));
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return 1;
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}
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static int math_exp (lua_State *L) {
lua_pushnumber(L, exp(luaL_check_number(L, 1)));
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return 1;
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}
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static int math_deg (lua_State *L) {
lua_pushnumber(L, luaL_check_number(L, 1)/RADIANS_PER_DEGREE);
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return 1;
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}
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static int math_rad (lua_State *L) {
lua_pushnumber(L, luaL_check_number(L, 1)*RADIANS_PER_DEGREE);
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return 1;
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}
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static int math_frexp (lua_State *L) {
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int e;
lua_pushnumber(L, frexp(luaL_check_number(L, 1), &e));
lua_pushnumber(L, e);
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return 2;
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}
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static int math_ldexp (lua_State *L) {
lua_pushnumber(L, ldexp(luaL_check_number(L, 1), luaL_check_int(L, 2)));
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return 1;
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}
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static int math_min (lua_State *L) {
int n = lua_gettop(L); /* number of arguments */
lua_Number dmin = luaL_check_number(L, 1);
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int i;
for (i=2; i<=n; i++) {
lua_Number d = luaL_check_number(L, i);
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if (d < dmin)
dmin = d;
}
lua_pushnumber(L, dmin);
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return 1;
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}
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static int math_max (lua_State *L) {
int n = lua_gettop(L); /* number of arguments */
lua_Number dmax = luaL_check_number(L, 1);
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int i;
for (i=2; i<=n; i++) {
lua_Number d = luaL_check_number(L, i);
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if (d > dmax)
dmax = d;
}
lua_pushnumber(L, dmax);
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return 1;
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}
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static int math_random (lua_State *L) {
/* the '%' avoids the (rare) case of r==1, and is needed also because on
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some systems (SunOS!) "rand()" may return a value larger than RAND_MAX */
lua_Number r = (lua_Number)(rand()%RAND_MAX) / (lua_Number)RAND_MAX;
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switch (lua_gettop(L)) { /* check number of arguments */
case 0: { /* no arguments */
lua_pushnumber(L, r); /* Number between 0 and 1 */
break;
}
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case 1: { /* only upper limit */
int u = luaL_check_int(L, 1);
luaL_arg_check(L, 1<=u, 1, "interval is empty");
lua_pushnumber(L, (int)(r*u)+1); /* integer between 1 and `u' */
break;
}
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case 2: { /* lower and upper limits */
int l = luaL_check_int(L, 1);
int u = luaL_check_int(L, 2);
luaL_arg_check(L, l<=u, 2, "interval is empty");
lua_pushnumber(L, (int)(r*(u-l+1))+l); /* integer between `l' and `u' */
break;
}
default: lua_error(L, "wrong number of arguments");
}
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return 1;
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}
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static int math_randomseed (lua_State *L) {
srand(luaL_check_int(L, 1));
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return 0;
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}
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static const struct luaL_reg mathlib[] = {
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{"abs", math_abs},
{"sin", math_sin},
{"cos", math_cos},
{"tan", math_tan},
{"asin", math_asin},
{"acos", math_acos},
{"atan", math_atan},
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{"atan2", math_atan2},
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{"ceil", math_ceil},
{"floor", math_floor},
{"mod", math_mod},
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{"frexp", math_frexp},
{"ldexp", math_ldexp},
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{"sqrt", math_sqrt},
{"min", math_min},
{"max", math_max},
{"log", math_log},
{"log10", math_log10},
{"exp", math_exp},
{"deg", math_deg},
{"rad", math_rad},
{"random", math_random},
{"randomseed", math_randomseed}
};
/*
** Open math library
*/
LUALIB_API void lua_mathlibopen (lua_State *L) {
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luaL_openl(L, mathlib);
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lua_pushcfunction(L, math_pow);
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lua_settagmethod(L, LUA_TNUMBER, "pow");
lua_pushnumber(L, PI);
lua_setglobal(L, "PI");
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}