| /* |
| ** $Id: lmathlib.c,v 1.27 2000/08/28 17:57:04 roberto Exp roberto $ |
| ** Standard mathematical library |
| ** See Copyright Notice in lua.h |
| */ |
| |
| |
| #include <stdlib.h> |
| #include <math.h> |
| |
| #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 */ |
| double dmin = luaL_check_number(L, 1); |
| int i; |
| for (i=2; i<=n; i++) { |
| double 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 */ |
| double dmax = luaL_check_number(L, 1); |
| int i; |
| for (i=2; i<=n; i++) { |
| double 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 */ |
| double r = (double)(rand()%RAND_MAX) / (double)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, "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, "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"); |
| } |
| return 1; |
| } |
| |
| |
| static int math_randomseed (lua_State *L) { |
| srand(luaL_check_int(L, 1)); |
| return 0; |
| } |
| |
| |
| static const struct luaL_reg mathlib[] = { |
| {"abs", math_abs}, |
| {"sin", math_sin}, |
| {"cos", math_cos}, |
| {"tan", math_tan}, |
| {"asin", math_asin}, |
| {"acos", math_acos}, |
| {"atan", math_atan}, |
| {"atan2", math_atan2}, |
| {"ceil", math_ceil}, |
| {"floor", math_floor}, |
| {"mod", math_mod}, |
| {"frexp", math_frexp}, |
| {"ldexp", math_ldexp}, |
| {"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 |
| */ |
| void lua_mathlibopen (lua_State *L) { |
| luaL_openl(L, mathlib); |
| lua_pushnumber(L, 0); /* to get its tag */ |
| lua_pushcfunction(L, math_pow); |
| lua_settagmethod(L, lua_tag(L, -2), "pow"); |
| lua_pop(L, 1); /* remove number */ |
| lua_pushnumber(L, PI); lua_setglobal(L, "PI"); |
| } |
| |