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/*
* utils.c
*
* Utility stuff
*
* (c) 2007 Thomas White <taw27@cam.ac.uk>
* dtr - Diffraction Tomography Reconstruction
*
*/
#include <math.h>
/* Return the MOST POSITIVE of two numbers */
unsigned int biggest(signed int a, signed int b) {
if ( a>b ) {
return a;
}
return b;
}
/* Return the LEAST POSITIVE of two numbers */
unsigned int smallest(signed int a, signed int b) {
if ( a<b ) {
return a;
}
return b;
}
double distance(double x1, double y1, double x2, double y2) {
return sqrt((x2-x1)*(x2-x1) + (y2-y1)*(y2-y1));
}
double modulus(double x, double y, double z) {
return sqrt(x*x + y*y + z*z);
}
/* Angle between two vectors. Answer in degrees */
double angle_between(double x1, double y1, double z1, double x2, double y2, double z2) {
double mod1 = modulus(x1, y1, z1);
double mod2 = modulus(x2, y2, z2);
return ((acos((x1*x2 + y1*y2 + z1*z2) / (mod1*mod2)))/M_PI) * 180;
}
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