ptarray_longitude_shift()

void ptarray_longitude_shift

(

POINTARRAY *

pa

)

Longitude shift for a pointarray.

Y remains the same X is converted: from -180..180 to 0..360 from 0..360 to -180..180 X < 0 becomes X + 360 X > 180 becomes X - 360

Definition at line 1417 of file ptarray.c.

References getPoint_internal(), POINTARRAY::npoints, and pixval::x.

Referenced by lwgeom_longitude_shift().

{
        int i;
        double x;

        for (i=0; i<pa->npoints; i++)
        {
                memcpy(&x, getPoint_internal(pa, i), sizeof(double));
                if ( x < 0 ) x+= 360;
                else if ( x > 180 ) x -= 360;
                memcpy(getPoint_internal(pa, i), &x, sizeof(double));
        }
}

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