internal static com.epl.geometry.Geometry CalculateConvexHull_(com.epl.geometry.Geometry geom, com.epl.geometry.ProgressTracker progress_tracker)
{
if (geom.IsEmpty())
{
return(geom.CreateInstance());
}
com.epl.geometry.Geometry.Type type = geom.GetType();
if (com.epl.geometry.Geometry.IsSegment(type.Value()))
{
// Segments are always returned either as a Point or Polyline
com.epl.geometry.Segment segment = (com.epl.geometry.Segment)geom;
if (segment.GetStartXY().Equals(segment.GetEndXY()))
{
com.epl.geometry.Point point = new com.epl.geometry.Point();
segment.QueryStart(point);
return(point);
}
else
{
com.epl.geometry.Point pt = new com.epl.geometry.Point();
com.epl.geometry.Polyline polyline = new com.epl.geometry.Polyline(geom.GetDescription());
segment.QueryStart(pt);
polyline.StartPath(pt);
segment.QueryEnd(pt);
polyline.LineTo(pt);
return(polyline);
}
}
else
{
if (type == com.epl.geometry.Geometry.Type.Envelope)
{
com.epl.geometry.Envelope envelope = (com.epl.geometry.Envelope)geom;
com.epl.geometry.Envelope2D env = new com.epl.geometry.Envelope2D();
envelope.QueryEnvelope2D(env);
if (env.xmin == env.xmax && env.ymin == env.ymax)
{
com.epl.geometry.Point point = new com.epl.geometry.Point();
envelope.QueryCornerByVal(0, point);
return(point);
}
else
{
if (env.xmin == env.xmax || env.ymin == env.ymax)
{
com.epl.geometry.Point pt = new com.epl.geometry.Point();
com.epl.geometry.Polyline polyline = new com.epl.geometry.Polyline(geom.GetDescription());
envelope.QueryCornerByVal(0, pt);
polyline.StartPath(pt);
envelope.QueryCornerByVal(1, pt);
polyline.LineTo(pt);
return(polyline);
}
else
{
com.epl.geometry.Polygon polygon = new com.epl.geometry.Polygon(geom.GetDescription());
polygon.AddEnvelope(envelope, false);
return(polygon);
}
}
}
}
if (IsConvex_(geom, progress_tracker))
{
if (type == com.epl.geometry.Geometry.Type.MultiPoint)
{
// Downgrade to a Point for simplistic output
com.epl.geometry.MultiPoint multi_point = (com.epl.geometry.MultiPoint)geom;
com.epl.geometry.Point point = new com.epl.geometry.Point();
multi_point.GetPointByVal(0, point);
return(point);
}
return(geom);
}
System.Diagnostics.Debug.Assert((com.epl.geometry.Geometry.IsMultiVertex(type.Value())));
com.epl.geometry.Geometry convex_hull = com.epl.geometry.ConvexHull.Construct((com.epl.geometry.MultiVertexGeometry)geom);
return(convex_hull);
}
