lwt_edgeEnd_fromEdge()

LWT_EDGEEND * lwt_edgeEnd_fromEdge	(	const LWT_ISO_EDGE *	edge,
		int	outgoing
	)

Definition at line 68 of file lwt_edgeend.c.

{
  LWT_EDGEEND *ee = lwalloc(sizeof(LWT_EDGEEND));
  ee->edge = edge;
  ee->outgoing = outgoing;
  const POINTARRAY *pa = edge->geom->points;
 
  int ret = _lwt_DistinctVertexes2D(
    edge->geom->points,
    outgoing ? 0 : pa->npoints-1, // from,
    outgoing ? 1 : -1, // dir,
    &(ee->p0),
    &(ee->p1)
  );
  if (!ret)
  {
    lwerror("No distinct vertices found in edge %" LWTFMT_ELEMID, edge->edge_id);
    return NULL;
  }
 
  if ( ! azimuth_pt_pt(&(ee->p0), &(ee->p1), &(ee->azimuth)) ) {
    lwerror("error computing azimuth of endpoint [%.15g %.15g,%.15g %.15g]",
            ee->p0.x, ee->p0.y,
            ee->p1.x, ee->p1.y
    );
    return NULL;
  }
 
  LWDEBUGF(1, "Azimuth of segment [%.15g %.15g,%.15g %.15g] = %.15g",
            ee->p0.x, ee->p0.y,
            ee->p1.x, ee->p1.y,
            ee->azimuth
  );
 
  return ee;
}

References _lwt_DistinctVertexes2D(), LWT_EDGEEND_t::azimuth, azimuth_pt_pt(), LWT_EDGEEND_t::edge, LWT_ISO_EDGE::edge_id, LWT_ISO_EDGE::geom, lwalloc(), LWDEBUGF, lwerror(), LWTFMT_ELEMID, POINTARRAY::npoints, LWT_EDGEEND_t::outgoing, LWT_EDGEEND_t::p0, LWT_EDGEEND_t::p1, LWLINE::points, POINT2D::x, and POINT2D::y.

Referenced by lwt_edgeEndStar_addEdge().

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