[分享]用C#实现命令“创建要素”的实现方法

chase_wang

平台：vs.net2008 AutoCAD Map3d 2010

 

部份实现代码:

using OSGeo.MapGuide;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.EditorInput;
using Autodesk.Gis.Map.Platform;
using Autodesk.Gis.Map.Platform.Interop;

        /// <summary>
        /// 创建要素
        /// </summary>
        public void CreateFeature()
        {
            AcMapMap currentMap = AcMapMap.GetCurrentMap();
            MgLayerCollection layers = currentMap.GetLayers();

            MgLayerBase layer = SelectLayer(layers);
            MgClassDefinition classDef = layer.GetClassDefinition();
            MgPropertyDefinitionCollection propDefs = classDef.GetProperties();

            ObjectIdCollection objIds = CGcEditor.SelectEntities();
             int count = 0;
             Database db =
                     Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.MdiActiveDocument.Database;
             TransactionManager tm = db.TransactionManager;
             using (Transaction transaction = tm.StartTransaction())
             {
                 foreach (ObjectId objId in objIds)
                 {
                     Entity entity = (Entity)tm.GetObject(objId, OpenMode.ForWrite, false);
                     bool addSuccess = AddFeature(layer, entity);
                     if (addSuccess)
                     {
                         count++;
                         entity.Erase();
                     }
                 }

                 string msg = "Convert the entity to feature successfully.";
                 if (count > 1)
                 {
                     msg = string.Format("Converted {0} entities to features successfully!", count);
                 }
                 if (count > 0)
                 {
                     CGcEditor.ShowMessage(msg);
                 }
                 transaction.Commit();
             }
        }

 

 

        /// <summary>
        /// Entity -> MgGeometry
        /// </summary>
        private bool AddFeature(MgLayerBase layer, Entity entity)
        {
            if (layer == null || entity == null)
                return false;

            MgGeometry geometry = CEntityToGeometryConverter.EntityToGeometry(entity);
            if (geometry == null)
                return false;

            MgClassDefinition classDef = layer.GetClassDefinition();
            string featClassName = layer.FeatureClassName;
            MgPropertyDefinitionCollection propDefs = classDef.GetProperties();
            MgGeometricPropertyDefinition geoPropDef = propDefs.GetItem(classDef.DefaultGeometryPropertyName)
                                                                    as MgGeometricPropertyDefinition;
            
            int layerGeometryType = geoPropDef.GeometryTypes;           
            int geoType = geometry.GetGeometryType();
            if (!GeometryTypeValidate(layerGeometryType, geoType))
            {
                CGcEditor.ShowMessage("Geometry type of the entity is invalid to the targeting layer.");
                return false;
            }

            MgPropertyCollection props = new MgPropertyCollection();
            props = InputPropertyValues(propDefs, geometry);
            if (props != null)
            {
                MgInsertFeatures insertFeat = new MgInsertFeatures(featClassName, props);
                MgFeatureCommandCollection featCommands = new MgFeatureCommandCollection();
                featCommands.Add(insertFeat);
                try
                {
                    layer.UpdateFeatures(featCommands);
                }
                catch (System.Exception e)
                {
                    CGcEditor.ShowMessage("Failed to add a Feature.");
                    CGcEditor.ShowMessage(e.Message);
                    return false;
                }
                return true;
            }
            else
            {
                CGcEditor.ShowMessage("Operation cancelled");
                return false;
            }
        }

 

 

        /// <summary>
        /// Convert Entity to MgGeometry.
        /// </summary>
        public static MgGeometry EntityToGeometry(Entity entity)
        {
            if (entity == null)
                return null;
            MgGeometry geometry = null;

            string entityType = entity.GetType().Name;

            switch (entityType)
            {
                case "DBPoint":
                    geometry = PointGeometryConvert((DBPoint)entity);
                    break;

                case "Line":
                    geometry = LineGeometryConvert((Line)entity);
                    break;

                case "Polyline":
                    geometry = PolylineGeometryConvert((Polyline)entity);
                    break;

                case "MPolygon":
                    geometry = MPolygonGeometryConvert((MPolygon)entity);
                    break;

                default:
                    break;
            }
            return geometry;
        }