Выполнение логических операций с областями (regions)

В приведённом ниже коде сначала создаётся две области (красная и жёлтая), затем к их копиям применяются различные логические операции. Результат размещается рядом и подсвечивается зелёным цветом. Результат работы кода показан на скрине.

Комментировать тут особо не чего, поэтому сразу код:

   1:  /* RegionBooleanOperationsSample.cs

   2:   * © Andrey Bushman, 2014 

   3:   */

   4:  using System;

   5:  using System.Collections.Generic;

   6:  using System.Linq;

   7:   

   8:  #if AUTOCAD

   9:  using cad = Autodesk.AutoCAD.ApplicationServices.Application;

  10:  using Ap = Autodesk.AutoCAD.ApplicationServices;

  11:  using Db = Autodesk.AutoCAD.DatabaseServices;

  12:  using Ed = Autodesk.AutoCAD.EditorInput;

  13:  using Rt = Autodesk.AutoCAD.Runtime;

  14:  using Gm = Autodesk.AutoCAD.Geometry;

  15:  using Wn = Autodesk.AutoCAD.Windows;

  16:  using Hs = Autodesk.AutoCAD.DatabaseServices.HostApplicationServices;

  17:  using Us = Autodesk.AutoCAD.DatabaseServices.SymbolUtilityServices;

  18:  #endif

  19:   

  20:  [assembly: Rt.CommandClass(typeof(Bushman.CAD.Experiences

  21:    .RegionBooleanOperationsSample))]

  22:   

  23:  namespace Bushman.CAD.Experiences {

  24:    public class RegionBooleanOperationsSample {

  25:      const String cmdGroup = "Bushman";

  26:      [Rt.CommandMethod(cmdGroup, "CreateRegions", Rt.CommandFlags.Modal)]

  27:      public void CreateRegions() {

  28:        Ap.Document doc = cad.DocumentManager.MdiActiveDocument;

  29:        if(doc == null || doc.IsDisposed)

  30:          return;

  31:        using(doc.LockDocument()) {

  32:          Ed.Editor ed = doc.Editor;

  33:          Db.Database db = doc.Database;

  34:   

  35:          Gm.Point2d[] points_1 = new Gm.Point2d[]{

  36:            new Gm.Point2d(0,0),

  37:            new Gm.Point2d(0,70),

  38:            new Gm.Point2d(10,70),

  39:            new Gm.Point2d(10,10),

  40:            new Gm.Point2d(40,10),

  41:            new Gm.Point2d(40,70),

  42:            new Gm.Point2d(50,70),

  43:            new Gm.Point2d(50,10),

  44:            new Gm.Point2d(80,10),

  45:            new Gm.Point2d(80,70),

  46:            new Gm.Point2d(90,70),

  47:            new Gm.Point2d(90,0)

  48:          };

  49:          Db.Region region_1 = CreateRegion(points_1, 10);

  50:   

  51:          Gm.Point2d[] points_2 = new Gm.Point2d[]{          

  52:            new Gm.Point2d(0,70),

  53:            new Gm.Point2d(90,70),

  54:            new Gm.Point2d(90,60),

  55:            new Gm.Point2d(0,60)

  56:          };

  57:          Db.Region region_2 = CreateRegion(points_2, 50);

  58:   

  59:          using(Db.Transaction tr = db.TransactionManager.StartTransaction()) {

  60:            Db.BlockTable bt = tr.GetObject(db.BlockTableId, Db.OpenMode.ForRead)

  61:              as Db.BlockTable;

  62:            Db.BlockTableRecord ms = tr.GetObject(bt[Db.BlockTableRecord

  63:              .ModelSpace], Db.OpenMode.ForWrite) as Db.BlockTableRecord;

  64:            ms.AppendEntity(region_1);

  65:            tr.AddNewlyCreatedDBObject(region_1, true);

  66:            ms.AppendEntity(region_2);

  67:            tr.AddNewlyCreatedDBObject(region_2, true);

  68:   

  69:            Db.DBText text = new Db.DBText();

  70:            text.SetDatabaseDefaults();

  71:            text.Height = 5;

  72:            text.TextString = "Base regions";

  73:            text.Position = new Gm.Point3d(0, 80, 0);

  74:            ms.AppendEntity(text);

  75:            tr.AddNewlyCreatedDBObject(text, true);

  76:   

  77:            Int32 dx = 120;

  78:            Int32 x = dx;

  79:   

  80:            foreach(String name in Enum.GetNames(typeof(Db.BooleanOperationType)

  81:              )) {

  82:              Db.Region region_1Clone = region_1.Clone() as Db.Region;

  83:              Db.Region region_2Clone = region_2.Clone() as Db.Region;

  84:              Db.DBText textClone = text.Clone() as Db.DBText;

  85:              textClone.TextString = String.Format("The {0} operation", name);

  86:   

  87:              Gm.Point3d acPt3d = new Gm.Point3d(0, 0, 0);

  88:              Gm.Vector3d acVec3d = acPt3d.GetVectorTo(new Gm.Point3d(x, 0,

  89:                0));

  90:   

  91:              region_1Clone.TransformBy(Gm.Matrix3d.Displacement(acVec3d));

  92:              region_2Clone.TransformBy(Gm.Matrix3d.Displacement(acVec3d));

  93:              textClone.TransformBy(Gm.Matrix3d.Displacement(acVec3d));

  94:   

  95:              region_2Clone.BooleanOperation((Db.BooleanOperationType)Enum

  96:                .Parse(typeof(Db.BooleanOperationType), name), region_1Clone);

  97:   

  98:              if(!region_2Clone.IsNull && region_1Clone.IsNull)

  99:                region_2Clone.ColorIndex = 80;

 100:   

 101:              ms.AppendEntity(region_1Clone);

 102:              tr.AddNewlyCreatedDBObject(region_1Clone, true);

 103:              ms.AppendEntity(region_2Clone);

 104:              tr.AddNewlyCreatedDBObject(region_2Clone, true);

 105:              ms.AppendEntity(textClone);

 106:              tr.AddNewlyCreatedDBObject(textClone, true);

 107:   

 108:              x += dx;

 109:            }

 110:            tr.Commit();

 111:          }

 112:        }

 113:        doc.SendStringToExecute("_ZOOM _E ", true, false, false);

 114:      }

 115:   

 116:      internal Db.Region CreateRegion(Gm.Point2d[] points, Int32 colorIndex) {

 117:        if(points == null)

 118:          throw new ArgumentNullException("points");

 119:        if(points.Length == 0)

 120:          throw new ArgumentException("points.Length == 0");

 121:        using(Db.Polyline pline = new Db.Polyline(12)) {

 122:          pline.SetDatabaseDefaults();

 123:          for(int i = 0; i < points.Length; i++)

 124:            pline.AddVertexAt(i, points[i], 0, 0, 0);

 125:          pline.Closed = true;

 126:          Db.Region region = Db.Region.CreateFromCurves(

 127:            new Db.DBObjectCollection { pline }).Cast<Db.Region>().First();

 128:          region.SetDatabaseDefaults();

 129:          region.ColorIndex = colorIndex;

 130:          return region;

 131:        }

 132:      }

 133:    }

 134:  }

Результат выглядит следующим образом: