ptarray_length()

double ptarray_length

(

const POINTARRAY *

pts

)

Find the 3d/2d length of the given POINTARRAY (depending on its dimensionality)

Definition at line 1991 of file ptarray.c.

{
        double dist = 0.0;
        uint32_t i;
        POINT3DZ frm;
        POINT3DZ to;
 
        if ( pts->npoints < 2 ) return 0.0;
 
        /* compute 2d length if 3d is not available */
        if ( ! FLAGS_GET_Z(pts->flags) ) return ptarray_length_2d(pts);
 
        getPoint3dz_p(pts, 0, &frm);
        for ( i=1; i < pts->npoints; i++ )
        {
                getPoint3dz_p(pts, i, &to);
                dist += sqrt( ((frm.x - to.x)*(frm.x - to.x)) +
                              ((frm.y - to.y)*(frm.y - to.y)) +
                              ((frm.z - to.z)*(frm.z - to.z)) );
                frm = to;
        }
        return dist;
}

References POINTARRAY::flags, FLAGS_GET_Z, getPoint3dz_p(), POINTARRAY::npoints, ptarray_length_2d(), POINT3DZ::x, POINT3DZ::y, and POINT3DZ::z.

Referenced by lwline_interpolate_point_3d(), lwline_length(), lwpoly_perimeter(), and lwtriangle_perimeter().

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