wmweather+/convert.h

   1 #ifndef PI
   2 # define PI 3.1415926535897932384626433832795029L
   3 #endif
   4
   5 /*
   6  * Note that all floating point calculations are rounded with .5 going up.
   7  * Since C automatically truncates, adding .5 to every calculation does
   8  * rounding for us nicely.
   9  *
  10  * To indicate unavailable data
  11  *   999 is used for temperature
  12  *   x<0 is used for rh, pressure, and windspeed
  13  */
  14
  15 /* Calculations */
  16 int rh_C(int temp_C, int dewpt_C);
  17 int rh_F(int temp_F, int dewpt_F);
  18 int heatindex_C(int temp_C, int rh);
  19 int heatindex_F(int temp_F, int rh);
  20 int windchill_C(int temp_C, int windspeed); /* knots */
  21 int windchill_F(int temp_F, int windspeed); /* knots */
  22
  23 /* Length Conversions */
  24 int in2cm(int in);
  25 float m2mi(int meters);
  26
  27 /* Windspeed Conversions */
  28 int knots2mph(int knots);
  29 int knots2kph(int knots);
  30 int knots2mps(int knots);
  31 int knots2beaufort(int knots);
  32 int kph2knots(int kph);
  33 int mps2knots(int mps);
  34
  35 /* Temperature Conversions */
  36 int temp_C2F(int temp_C);
  37 int temp_F2C(int temp_F);
  38
  39 /* Pressure Conversions */
  40 float inHg2mmHg(float inHg);
  41 float inHg2hPa(float inHg);
  42 float inHg2atm(float inHg);
  43 float hPa2inHg(float hPa);
  44
  45 /* Time Conversions */
  46 time_t mkgmtime(struct tm *tm);
  47 int utc2local(int hm, int *mon, int *day, int *year, int *wday);
  48 int local2utc(int hm, int *mon, int *day, int *year, int *wday);
  49 void fix_date(int *month, int *day, int *year, int *wday);
  50 int hm2min(int hm);
  51
  52 /* Letter Case (destructive!) */
  53 char *str_upper(char *str);
  54 char *str_lower(char *str);
  55
  56 /* Angle conversions */
  57 double rad2deg(double angle);
  58 double deg2rad(double angle);
  59
  60 /* Date conversions */
  61 int mdy2doy(int mn, int dy, int y);
  62 double mdy2jd(int year, int month, int day);
  63 double jd2jcent(double jd);
  64 double jcent2jd(double t);
  65
  66 /* Lat/Long conversions */
  67 int str2dd(char *s, double *lat, double *lon);