mirror of
https://github.com/lua/lua
synced 2024-11-30 00:23:24 +03:00
241 lines
5.4 KiB
C
241 lines
5.4 KiB
C
/*
|
|
** $Id: lmathlib.c,v 1.37 2001/03/06 20:09:38 roberto Exp roberto $
|
|
** Standard mathematical library
|
|
** See Copyright Notice in lua.h
|
|
*/
|
|
|
|
|
|
#include <stdlib.h>
|
|
#include <math.h>
|
|
|
|
#define LUA_PRIVATE
|
|
#include "lua.h"
|
|
|
|
#include "lauxlib.h"
|
|
#include "lualib.h"
|
|
|
|
|
|
#undef PI
|
|
#define PI (3.14159265358979323846)
|
|
#define RADIANS_PER_DEGREE (PI/180.0)
|
|
|
|
|
|
|
|
/*
|
|
** If you want Lua to operate in radians (instead of degrees),
|
|
** define RADIANS
|
|
*/
|
|
#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
|
|
|
|
|
|
static int math_abs (lua_State *L) {
|
|
lua_pushnumber(L, fabs(luaL_check_number(L, 1)));
|
|
return 1;
|
|
}
|
|
|
|
static int math_sin (lua_State *L) {
|
|
lua_pushnumber(L, sin(TORAD(luaL_check_number(L, 1))));
|
|
return 1;
|
|
}
|
|
|
|
static int math_cos (lua_State *L) {
|
|
lua_pushnumber(L, cos(TORAD(luaL_check_number(L, 1))));
|
|
return 1;
|
|
}
|
|
|
|
static int math_tan (lua_State *L) {
|
|
lua_pushnumber(L, tan(TORAD(luaL_check_number(L, 1))));
|
|
return 1;
|
|
}
|
|
|
|
static int math_asin (lua_State *L) {
|
|
lua_pushnumber(L, FROMRAD(asin(luaL_check_number(L, 1))));
|
|
return 1;
|
|
}
|
|
|
|
static int math_acos (lua_State *L) {
|
|
lua_pushnumber(L, FROMRAD(acos(luaL_check_number(L, 1))));
|
|
return 1;
|
|
}
|
|
|
|
static int math_atan (lua_State *L) {
|
|
lua_pushnumber(L, FROMRAD(atan(luaL_check_number(L, 1))));
|
|
return 1;
|
|
}
|
|
|
|
static int math_atan2 (lua_State *L) {
|
|
lua_pushnumber(L, FROMRAD(atan2(luaL_check_number(L, 1), luaL_check_number(L, 2))));
|
|
return 1;
|
|
}
|
|
|
|
static int math_ceil (lua_State *L) {
|
|
lua_pushnumber(L, ceil(luaL_check_number(L, 1)));
|
|
return 1;
|
|
}
|
|
|
|
static int math_floor (lua_State *L) {
|
|
lua_pushnumber(L, floor(luaL_check_number(L, 1)));
|
|
return 1;
|
|
}
|
|
|
|
static int math_mod (lua_State *L) {
|
|
lua_pushnumber(L, fmod(luaL_check_number(L, 1), luaL_check_number(L, 2)));
|
|
return 1;
|
|
}
|
|
|
|
static int math_sqrt (lua_State *L) {
|
|
lua_pushnumber(L, sqrt(luaL_check_number(L, 1)));
|
|
return 1;
|
|
}
|
|
|
|
static int math_pow (lua_State *L) {
|
|
lua_pushnumber(L, pow(luaL_check_number(L, 1), luaL_check_number(L, 2)));
|
|
return 1;
|
|
}
|
|
|
|
static int math_log (lua_State *L) {
|
|
lua_pushnumber(L, log(luaL_check_number(L, 1)));
|
|
return 1;
|
|
}
|
|
|
|
static int math_log10 (lua_State *L) {
|
|
lua_pushnumber(L, log10(luaL_check_number(L, 1)));
|
|
return 1;
|
|
}
|
|
|
|
static int math_exp (lua_State *L) {
|
|
lua_pushnumber(L, exp(luaL_check_number(L, 1)));
|
|
return 1;
|
|
}
|
|
|
|
static int math_deg (lua_State *L) {
|
|
lua_pushnumber(L, luaL_check_number(L, 1)/RADIANS_PER_DEGREE);
|
|
return 1;
|
|
}
|
|
|
|
static int math_rad (lua_State *L) {
|
|
lua_pushnumber(L, luaL_check_number(L, 1)*RADIANS_PER_DEGREE);
|
|
return 1;
|
|
}
|
|
|
|
static int math_frexp (lua_State *L) {
|
|
int e;
|
|
lua_pushnumber(L, frexp(luaL_check_number(L, 1), &e));
|
|
lua_pushnumber(L, e);
|
|
return 2;
|
|
}
|
|
|
|
static int math_ldexp (lua_State *L) {
|
|
lua_pushnumber(L, ldexp(luaL_check_number(L, 1), luaL_check_int(L, 2)));
|
|
return 1;
|
|
}
|
|
|
|
|
|
|
|
static int math_min (lua_State *L) {
|
|
int n = lua_gettop(L); /* number of arguments */
|
|
lua_Number dmin = luaL_check_number(L, 1);
|
|
int i;
|
|
for (i=2; i<=n; i++) {
|
|
lua_Number d = luaL_check_number(L, i);
|
|
if (d < dmin)
|
|
dmin = d;
|
|
}
|
|
lua_pushnumber(L, dmin);
|
|
return 1;
|
|
}
|
|
|
|
|
|
static int math_max (lua_State *L) {
|
|
int n = lua_gettop(L); /* number of arguments */
|
|
lua_Number dmax = luaL_check_number(L, 1);
|
|
int i;
|
|
for (i=2; i<=n; i++) {
|
|
lua_Number d = luaL_check_number(L, i);
|
|
if (d > dmax)
|
|
dmax = d;
|
|
}
|
|
lua_pushnumber(L, dmax);
|
|
return 1;
|
|
}
|
|
|
|
|
|
static int math_random (lua_State *L) {
|
|
/* the `%' avoids the (rare) case of r==1, and is needed also because on
|
|
some systems (SunOS!) `rand()' may return a value larger than RAND_MAX */
|
|
lua_Number r = (lua_Number)(rand()%RAND_MAX) / (lua_Number)RAND_MAX;
|
|
switch (lua_gettop(L)) { /* check number of arguments */
|
|
case 0: { /* no arguments */
|
|
lua_pushnumber(L, r); /* Number between 0 and 1 */
|
|
break;
|
|
}
|
|
case 1: { /* only upper limit */
|
|
int u = luaL_check_int(L, 1);
|
|
luaL_arg_check(L, 1<=u, 1, l_s("interval is empty"));
|
|
lua_pushnumber(L, (int)(r*u)+1); /* integer between 1 and `u' */
|
|
break;
|
|
}
|
|
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, l_s("interval is empty"));
|
|
lua_pushnumber(L, (int)(r*(u-l+1))+l); /* integer between `l' and `u' */
|
|
break;
|
|
}
|
|
default: lua_error(L, l_s("wrong number of arguments"));
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
|
|
static int math_randomseed (lua_State *L) {
|
|
srand(luaL_check_int(L, 1));
|
|
return 0;
|
|
}
|
|
|
|
|
|
static const luaL_reg mathlib[] = {
|
|
{l_s("abs"), math_abs},
|
|
{l_s("sin"), math_sin},
|
|
{l_s("cos"), math_cos},
|
|
{l_s("tan"), math_tan},
|
|
{l_s("asin"), math_asin},
|
|
{l_s("acos"), math_acos},
|
|
{l_s("atan"), math_atan},
|
|
{l_s("atan2"), math_atan2},
|
|
{l_s("ceil"), math_ceil},
|
|
{l_s("floor"), math_floor},
|
|
{l_s("mod"), math_mod},
|
|
{l_s("frexp"), math_frexp},
|
|
{l_s("ldexp"), math_ldexp},
|
|
{l_s("sqrt"), math_sqrt},
|
|
{l_s("min"), math_min},
|
|
{l_s("max"), math_max},
|
|
{l_s("log"), math_log},
|
|
{l_s("log10"), math_log10},
|
|
{l_s("exp"), math_exp},
|
|
{l_s("deg"), math_deg},
|
|
{l_s("rad"), math_rad},
|
|
{l_s("random"), math_random},
|
|
{l_s("randomseed"), math_randomseed}
|
|
};
|
|
|
|
/*
|
|
** Open math library
|
|
*/
|
|
LUALIB_API int lua_mathlibopen (lua_State *L) {
|
|
luaL_openl(L, mathlib);
|
|
lua_pushcfunction(L, math_pow);
|
|
lua_settagmethod(L, LUA_TNUMBER, l_s("pow"));
|
|
lua_pushnumber(L, PI);
|
|
lua_setglobal(L, l_s("PI"));
|
|
return 0;
|
|
}
|
|
|