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| author | Frank Warmerdam <warmerdam@pobox.com> | 1999-03-18 16:34:52 +0000 |
|---|---|---|
| committer | Frank Warmerdam <warmerdam@pobox.com> | 1999-03-18 16:34:52 +0000 |
| commit | 565a4bd035b9d4a83955808efef20f1d8dfa24cf (patch) | |
| tree | 75785fc897708023f1ccdaf40079afcbaaf0fd3a /src/adjlon.c | |
| download | PROJ-565a4bd035b9d4a83955808efef20f1d8dfa24cf.tar.gz PROJ-565a4bd035b9d4a83955808efef20f1d8dfa24cf.zip | |
New
git-svn-id: http://svn.osgeo.org/metacrs/proj/trunk@776 4e78687f-474d-0410-85f9-8d5e500ac6b2
Diffstat (limited to 'src/adjlon.c')
| -rw-r--r-- | src/adjlon.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/src/adjlon.c b/src/adjlon.c new file mode 100644 index 00000000..3de12a16 --- /dev/null +++ b/src/adjlon.c @@ -0,0 +1,16 @@ +/* reduce argument to range +/- PI */ +#ifndef lint +static const char SCCSID[]="@(#)adjlon.c 4.3 93/06/12 GIE REL"; +#endif +#include <math.h> +/* note: PI adjusted high +** approx. true val: 3.14159265358979323844 +*/ +#define SPI 3.14159265359 +#define TWOPI 6.2831853071795864769 + double +adjlon (double lon) { + while ( fabs(lon) > SPI ) + lon += lon < 0. ? TWOPI : -TWOPI; + return( lon ); +} |