Editing a Geometry Object

This example demonstrates how to modify each part of a multipart geometry. This example uses the IGeometryCreator (CreateGeometryFromWKT), ICreator80 (CreatePolygon, IPosition80 (Distance, Pitch), INavigate80 (JumpTo), and IPolygon(StartEdit, EndEdit) properties and methods.

private void btnEdit()

        {

            try

            {

                var SGWorld = new SGWorld80();

                var geometry = SGWorld.Creator.GeometryCreator.CreateGeometryFromWKT(@"POLYGON(

                                (-82.900091 26.739261,-82.906338 26.840896,-82.591731 26.951601,-82.809248 26.717179,-82.900091 26.739261),

                                (-82.873569 26.819371,-82.81616 26.772908,-82.811242 26.846308,-82.873569 26.819371)

                                )");

                var polygon = SGWorld.Creator.CreatePolygon(geometry, Color.AliceBlue.ToArgb(), Color.Bisque.ToArgb(), AltitudeTypeCode.ATC_TERRAIN_RELATIVE, string.Empty, "Polygon");

                polygon.Position.Distance = 80000;

                polygon.Position.Pitch = -45;

                SGWorld.Navigate.JumpTo(polygon);

                MessageBox.Show("Polygon created. Click Ok to move all its points 0.001 to the right on x axis and add z value");

                // convert polygon geometry to its type

                var polygonGeometry = polygon.Geometry as IPolygon;

                // call start edit on the polygon

                polygonGeometry.StartEdit();

                // iterate over all of its rings. First one is exterior ring. All after it, are interior rings

                foreach (ILinearRing ring in polygonGeometry.Rings)

                {

                    foreach (IPoint point in ring.Points)

                    {

                        point.X += 0.001;

                        point.Z += point.X + point.Y;

                    }

                }

                // call EndEdit at the end. EndEdit returns new IGeometry. It does so, because IPolygon could have turned to IMultiPolygon

                var editedGeometry = polygonGeometry.EndEdit();

                // set the new geometry to the object

                polygon.Geometry = editedGeometry;

            }

            catch (Exception ex)

            {

                MessageBox.Show("Unexpected error: " + ex.Message);

            }

        }