ptarray_length_2d()

double ptarray_length_2d ( const POINTARRAY *  pts )

extern

Find the 2d length of the given POINTARRAY (even if it's 3d)

Definition at line 1975 of file ptarray.c.

{
        double dist = 0.0;
        uint32_t i;
        const POINT2D *frm;
        const POINT2D *to;
 
        if ( pts->npoints < 2 ) return 0.0;
 
        frm = getPoint2d_cp(pts, 0);
 
        for ( i=1; i < pts->npoints; i++ )
        {
                to = getPoint2d_cp(pts, i);
 
                dist += sqrt( ((frm->x - to->x)*(frm->x - to->x))  +
                              ((frm->y - to->y)*(frm->y - to->y)) );
 
                frm = to;
        }
        return dist;
}

References getPoint2d_cp(), POINTARRAY::npoints, POINT2D::x, and POINT2D::y.

Referenced by LWGEOM_line_substring(), lwline_crossing_direction(), lwline_interpolate_points(), lwline_length_2d(), lwline_measured_from_lwline(), lwmline_measured_from_lwmline(), lwpoly_perimeter_2d(), lwtriangle_perimeter_2d(), ptarray_length(), ptarray_locate_point(), and ptarray_substring().

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