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#include <glib.h>
#include <math.h>
#include "mod360.h"
/** Returns \a x wrapped around to between 0 and less than 360,
or 0 if \a x isn't finite.
**/
double mod360(double const x)
{
double const m = fmod(x, 360.0);
double const ret = ( isnan(m)
? 0.0
: ( m < 0
? m + 360
: m ) );
g_return_val_if_fail(0.0 <= ret && ret < 360.0,
0.0);
return ret;
}
/** Returns \a x wrapped around to between -180 and less than 180,
or 0 if \a x isn't finite.
**/
double mod360symm(double const x)
{
double m = mod360(x);
return m < 180.0 ? m : m - 360.0;
}
/*
Local Variables:
mode:c++
c-file-style:"stroustrup"
c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
indent-tabs-mode:nil
fill-column:99
End:
*/
// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
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