#include <math.h>

#include "2dmath.h"

double norm2(XY v)
{
 return(hypot(v.x,v.y));
}

XY add2(XY a, XY b)
{
 return((XY){.x=a.x+b.x,.y=a.y+b.y});
}

XY sub2(XY a, XY b)
{
 return((XY){.x=a.x-b.x,.y=a.y-b.y});
}

XY scale2(XY v, double f)
{
 return((XY){.x=v.x*f,.y=v.y*f});
}

XY rot90(XY v)
{
 return((XY){.x=-v.y,.y=v.x});
}