1 
2 #ifndef RASTERUTIL_GUARD
3 #define RASTERUTIL_GUARD
4 
5 
6 #include <math.h>
7 #include "Rmath.h"
8 
9 #ifndef M_PI
10 #define M_PI (3.14159265358979323846)
11 #endif
12 
13 
mod(double x,double n)14 double mod(double x, double n) {
15 	return(x - n * floor(x/n));
16 }
17 
normalizeLonDeg(double lon)18 double normalizeLonDeg(double lon) {
19 	return( mod( (lon + 180), 360 ) - 180 );
20 }
21 
normalizeLonRad(double lon)22 double normalizeLonRad(double lon) {
23 	return( mod( (lon + M_PI), M_2PI) - M_PI);
24 }
25 
26 
27 /* Convert degrees to radians */
toRad(double deg)28 double toRad(double deg) {
29 	return( deg * 0.0174532925199433 );
30 }
31 
toDeg(double rad)32 double toDeg(double rad) {
33 	return( rad * 57.2957795130823 );
34 }
35 
36 
37 
38 
39 #endif
40 
41