ptarray_swap_ordinates()

void ptarray_swap_ordinates	(	POINTARRAY *	pa,
		LWORD	o1,
		LWORD	o2
	)

Swap ordinate values o1 and o2 on a given POINTARRAY.

Ordinates semantic is: 0=x 1=y 2=z 3=m

Definition at line 387 of file ptarray.c.

{
        uint32_t i;
        double d, *dp1, *dp2;
        POINT4D p;
 
  dp1 = ((double*)&p)+(unsigned)o1;
  dp2 = ((double*)&p)+(unsigned)o2;
        for (i=0 ; i < pa->npoints ; i++)
        {
                getPoint4d_p(pa, i, &p);
                d = *dp2;
                *dp2 = *dp1;
                *dp1 = d;
                ptarray_set_point4d(pa, i, &p);
        }
}

References getPoint4d_p(), POINTARRAY::npoints, and ptarray_set_point4d().

Referenced by lwgeom_swap_ordinates().

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