_lwt_InitEdgeEndByLine()

static int _lwt_InitEdgeEndByLine ( edgeend *  fee, edgeend *  lee, LWLINE *  edge, POINT2D *  fp, POINT2D *  lp  )

static

Definition at line 1434 of file lwgeom_topo.c.

{
  POINTARRAY *pa = edge->points;
  POINT2D pt;
 
  fee->nextCW = fee->nextCCW =
  lee->nextCW = lee->nextCCW = 0;
  fee->cwFace = fee->ccwFace =
  lee->cwFace = lee->ccwFace = -1;
 
  /* Compute azimuth of first edge end */
  LWDEBUG(1, "computing azimuth of first edge end");
  if ( ! _lwt_FirstDistinctVertex2D(pa, fp, 0, 1, &pt) )
  {
    lwerror("Invalid edge (no two distinct vertices exist)");
    return -1;
  }
  if ( ! azimuth_pt_pt(fp, &pt, &(fee->myaz)) ) {
    lwerror("error computing azimuth of first edgeend [%.15g %.15g,%.15g %.15g]",
            fp->x, fp->y, pt.x, pt.y);
    return -2;
  }
  LWDEBUGF(1, "azimuth of first edge end [%.15g %.15g,%.15g %.15g] is %g",
            fp->x, fp->y, pt.x, pt.y, fee->myaz);
 
  /* Compute azimuth of second edge end */
  LWDEBUG(1, "computing azimuth of second edge end");
  if ( ! _lwt_FirstDistinctVertex2D(pa, lp, pa->npoints-1, -1, &pt) )
  {
    lwerror("Invalid edge (no two distinct vertices exist)");
    return -1;
  }
  if ( ! azimuth_pt_pt(lp, &pt, &(lee->myaz)) ) {
    lwerror("error computing azimuth of last edgeend [%.15g %.15g,%.15g %.15g]",
            lp->x, lp->y, pt.x, pt.y);
    return -2;
  }
  LWDEBUGF(1, "azimuth of last edge end [%.15g %.15g,%.15g %.15g] is %g",
            lp->x, lp->y, pt.x, pt.y, lee->myaz);
 
  return 0;
}

References _lwt_FirstDistinctVertex2D(), azimuth_pt_pt(), edgeend_t::ccwFace, edgeend_t::cwFace, LWDEBUG, LWDEBUGF, lwerror(), edgeend_t::myaz, edgeend_t::nextCCW, edgeend_t::nextCW, POINTARRAY::npoints, LWLINE::points, POINT2D::x, and POINT2D::y.

Referenced by lwt_ChangeEdgeGeom().

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