xBIM 基礎16 IFC的空間層次結構

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本篇介紹如何從文件中檢索空間結構。IFC中的空間結構表示層次結構的嵌套結構，表示項目，站點，建築物，樓層和空間。若是您查看IFC文檔， 您會發現建築物能夠包含樓層以及其餘建築物，樓層能夠包含空間以及其餘樓層等。此類關係也使用IfcRelAggregates建模， 但若是要查找特定空間結構中包含的元素，則將其建模爲 IfcRelContainedInSpatialStructure， 所以它取決於您要查找的內容。下面的示例演示如何使用上述兩種關係搜索和遍歷數據以得到完整的層次結構。

using System;
using System.Linq;
using Xbim.Ifc;
using Xbim.Ifc4.Interfaces;

namespace BasicExamples
{
    class SpatialStructureExample
    {
        public static void Show()
        {
            const string file = "SampleHouse.ifc";

            using (var model = IfcStore.Open(file))
            {
                var project = model.Instances.FirstOrDefault<IIfcProject>();
                PrintHierarchy(project, 0);
            }
        }

        private static void PrintHierarchy(IIfcObjectDefinition o, int level)
        {
            Console.WriteLine(string.Format("{0}{1} [{2}]", GetIndent(level), o.Name, o.GetType().Name));

            // 只有空間元素能夠包含建築元素
            var spatialElement = o as IIfcSpatialStructureElement;
            if (spatialElement != null)
            {
                // 使用 IfcRelContainedInSpatialElement 獲取包含的元素
                var containedElements = spatialElement.ContainsElements.SelectMany(rel => rel.RelatedElements);
                foreach (var element in containedElements)
                    Console.WriteLine(string.Format("{0}    ->{1} [{2}]", GetIndent(level), element.Name, element.GetType().Name));
            }

            // 使用 IfcRelAggregares 獲取空間結構元素的空間分解
            foreach (var item in o.IsDecomposedBy.SelectMany(r => r.RelatedObjects))
                PrintHierarchy(item, level +1);
        }

        private static string GetIndent(int level)
        {
            var indent = "";
            for (int i = 0; i < level; i++)
                indent += "  ";
            return indent;
        }
    }
}

輸出結果以下：

Project Number [IfcProject]
  Default [IfcSite]
     [IfcBuilding]
      Ground Floor [IfcBuildingStorey]
          ->Basic Wall:Wall-Ext_102Bwk-75Ins-100LBlk-12P:285330 [IfcWall]
          ->Basic Wall:Wall-Ext_102Bwk-75Ins-100LBlk-12P:285395 [IfcWall]
          ->Basic Wall:Wall-Ext_102Bwk-75Ins-100LBlk-12P:285459 [IfcWall]
          ->Curtain Wall:Curtain_Wall-Exterior_Glazing:285582 [IfcCurtainWall]
          ->Curtain Wall:Curtain_Wall-Exterior_Glazing:285684 [IfcCurtainWall]
          ->Basic Wall:Wall-Partn_12P-70MStd-12P:285792 [IfcWallStandardCase]
          ->Basic Wall:Wall-Partn_12P-70MStd-12P:285846 [IfcWallStandardCase]
          ->Doors_ExtDbl_Flush:1810x2110mm:285860 [IfcDoor]
          ->Doors_IntSgl:810x2110mm:285959 [IfcDoor]
          ->Doors_IntSgl:810x2110mm:285996 [IfcDoor]
          ->Windows_Sgl_Plain:1810x1210mm:286105 [IfcWindow]
          ->Windows_Sgl_Plain:1810x1210mm:286188 [IfcWindow]
          ->Windows_Sgl_Plain:1810x1210mm:286238 [IfcWindow]
          ->Compound Ceiling:Plain:286319 [IfcCovering]
          ->Compound Ceiling:Plain:286329 [IfcCovering]
          ->Compound Ceiling:Plain:286337 [IfcCovering]
          ->Floor:Floor-Grnd-Susp_65Scr-80Ins-100Blk-75PC:286349 [IfcSlab]
          ->Windows_Sgl_Plain:1810x1210mm:287567 [IfcWindow]
        1 - Living room [IfcSpace]
            ->Furniture_Table_Dining_w-Chairs_Rectangular:2000x1000x750mm_w-6_Seats:289768 [IfcFurniture]
            ->Chair - Dining:Chair - Dining:289769 [IfcFurniture]
            ->Chair - Dining:Chair - Dining:289770 [IfcFurniture]
            ->Chair - Dining:Chair - Dining:289771 [IfcFurniture]
            ->Chair - Dining:Chair - Dining:289772 [IfcFurniture]
            ->Chair - Dining:Chair - Dining:290097 [IfcFurniture]
            ->Chair - Dining:Chair - Dining:290098 [IfcFurniture]
            ->Furniture_Couch_Viper:2290x950x340mm:290852 [IfcFurniture]
            ->Furniture_Chair_Viper:1120x940x350mm:291916 [IfcFurniture]
            ->Furniture_Chair_Viper:1120x940x350mm:292127 [IfcFurniture]
            ->Furniture_Table_Coffee_1:1200x550x450mm:293046 [IfcFurniture]
            ->Furniture_Piano:1370x600x1170mm:293961 [IfcFurniture]
        2 - Bedroom [IfcSpace]
            ->Furniture_Desk:1525x762mm:287689 [IfcFurniture]
            ->Furniture_Bed_1:1525x2007x355mm-Queen:295878 [IfcFurniture]
        3 - Entrance hall [IfcSpace]
      Roof [IfcBuildingStorey]
          ->Basic Roof:Roof_Flat-4Felt-150Ins-50Scr-150Conc-12Plr:286419 [IfcRoof]
          ->Floor:Simple floor:295048 [IfcSlab]
        4 - Roof [IfcSpace]

 

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