lwline_is_trajectory()

int lwline_is_trajectory

(

const LWLINE *

line

)

Definition at line 477 of file lwline.c.

References LWLINE::flags, FLAGS_GET_M, getPoint3dm_p(), LW_FALSE, LW_TRUE, lwnotice(), POINT3DM::m, POINTARRAY::npoints, and LWLINE::points.

Referenced by lwgeom_is_trajectory().

{
  POINT3DM p;
  int i, n;
  double m = -1 * FLT_MAX;

  if ( ! FLAGS_GET_M(line->flags) ) {
    lwnotice("Line does not have M dimension");
    return LW_FALSE;
  }

  n = line->points->npoints;
  if ( n < 2 ) return LW_TRUE; /* empty or single-point are "good" */

  for (i=0; i<n; ++i) {
    getPoint3dm_p(line->points, i, &p);
    if ( p.m <= m ) {
      lwnotice("Measure of vertex %d (%g) not bigger than measure of vertex %d (%g)",
        i, p.m, i-1, m);
      return LW_FALSE;
    }
    m = p.m;
  }

  return LW_TRUE;
}

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