lmathlib.c
上传用户:dzyhzl
上传日期:2019-04-29
资源大小:56270k
文件大小:5k
- /*
- ** $Id: lmathlib.c,v 1.32 2000/10/31 13:10:24 roberto Exp $
- ** 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);
- n= lua_gettop(L);
- 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
- */
- LUALIB_API void lua_mathlibopen (lua_State *L) {
- luaL_openl(L, mathlib);
- lua_pushcfunction(L, math_pow);
- lua_settagmethod(L, LUA_TNUMBER, "pow");
- lua_pushnumber(L, PI);
- lua_setglobal(L, "PI");
- }