C#如何遍历块获取块，内部图元坐标点集的最大包围框

jun353835273

C#如何遍历块获取块，内部图元坐标点集的最大包围框

https://forums.autodesk.com/t5/net/bounding-boxes-around-blocks/td-p/3822317

2. [CommandMethod("BBO")]
   
3. public void testBlockBound()
   
4. {
   
5. Document doc = Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.MdiActiveDocument;
   
6. 
   
7. Database db = doc.Database;
   
8. 
   
9. Editor ed = doc.Editor;
   
10. 
    
11. //Matrix3d ucs = ed.CurrentUserCoordinateSystem;
    
12. BlockReference clon = null;
    
13. 
    
14. doc.TransactionManager.EnableGraphicsFlush(true);
    
15. try
    
16. {
    
17. PromptEntityOptions peo = new PromptEntityOptions("\nSelect block: ");
    
18. 
    
19. peo.SetRejectMessage("Only a block instance !");
    
20. 
    
21. peo.AddAllowedClass(typeof(BlockReference), false);
    
22. 
    
23. PromptEntityResult per = ed.GetEntity(peo);
    
24. 
    
25. if (per.Status != PromptStatus.OK) return;
    
26. 
    
27. ObjectId id = per.ObjectId;
    
28. 
    
29. using (Transaction tr = db.TransactionManager.StartTransaction())
    
30. {
    
31. Entity ent = (Entity)tr.GetObject(id, OpenMode.ForRead);
    
32. 
    
33. if (ent == null) return;
    
34. 
    
35. BlockReference bref = ent as BlockReference;
    
36. 
    
37. if (bref == null) return;
    
38. 
    
39. clon = bref.Clone() as BlockReference;
    
40. 
    
41. clon.Rotation = 0;
    
42. 
    
43. clon.TransformBy(ed.CurrentUserCoordinateSystem);
    
44. 
    
45. tr.TransactionManager.QueueForGraphicsFlush();
    
46. 
    
47. Extents3d ext = clon.GeometryExtentsBestFit(ed.CurrentUserCoordinateSystem);
    
48. 
    
49. ext.TransformBy(ed.CurrentUserCoordinateSystem);
    
50. 
    
51. Polyline pl = new Polyline(4);
    
52. 
    
53. Point3d p1 = ext.MinPoint.TransformBy(ed.CurrentUserCoordinateSystem);
    
54. 
    
55. Point3d p3 = ext.MaxPoint.TransformBy(ed.CurrentUserCoordinateSystem);
    
56. 
    
57. Point3d p2 = new Point3d(p3.X, p1.Y, p1.Z).TransformBy(ed.CurrentUserCoordinateSystem);
    
58. 
    
59. Point3d p4 = new Point3d(p1.X, p3.Y, p1.Z).TransformBy(ed.CurrentUserCoordinateSystem);
    
60. 
    
61. pl.AddVertexAt(0, new Point2d(p1.X, p1.Y), 0.0, 0.0, 0.0);
    
62. 
    
63. pl.AddVertexAt(1, new Point2d(p2.X, p2.Y), 0.0, 0.0, 0.0);
    
64. 
    
65. pl.AddVertexAt(2, new Point2d(p3.X, p3.Y), 0.0, 0.0, 0.0);
    
66. 
    
67. pl.AddVertexAt(3, new Point2d(p4.X, p4.Y), 0.0, 0.0, 0.0);
    
68. 
    
69. pl.Closed = true;
    
70. 
    
71. pl.ColorIndex = 121;
    
72. 
    
73. pl.TransformBy(ed.CurrentUserCoordinateSystem);
    
74. 
    
75. Matrix3d rot = Matrix3d.Rotation(bref.Rotation, bref.Normal.GetNormal(), bref.Position);
    
76. 
    
77. pl.TransformBy(rot);
    
78. 
    
79. BlockTableRecord btr = (BlockTableRecord)tr.GetObject(db.CurrentSpaceId, OpenMode.ForWrite);
    
80. 
    
81. btr.AppendEntity(pl);
    
82. 
    
83. tr.AddNewlyCreatedDBObject(pl, true);
    
84. 
    
85. tr.TransactionManager.QueueForGraphicsFlush();
    
86. 
    
87. doc.TransactionManager.FlushGraphics();
    
88. 
    
89. tr.Commit();
    
90. 
    
91. }
    
92. }
    
93. catch (System.Exception e)
    
94. {
    
95. ed.WriteMessage("\nError: {0}\n{1}", e.Message, e.StackTrace);
    
96. }
    
97. finally
    
98. {
    
99. if (!clon.IsDisposed) clon.Dispose();//optional
    
100. }
     
101. }

[CommandMethod("BBO")]<br /> public void testBlockBound()<br /> {<br /> Document doc = Autodesk.<a href="http://bbs.mjtd.com/forum-41-1.html" target="_blank" class="relatedlink">AutoCAD</a>.ApplicationServices.Application.DocumentManager.MdiActiveDocument;<br /> <br /> Database db = doc.Database;<br /> <br /> Editor ed = doc.Editor;<br /> <br /> //Matrix3d ucs = ed.CurrentUserCoordinateSystem;<br /> BlockReference clon = null;<br /> <br /> doc.TransactionManager.EnableGraphicsFlush(true);<br /> try<br /> {<br /> PromptEntityOptions peo = new PromptEntityOptions("\nSelect block: ");<br /> <br /> peo.SetRejectMessage("Only a block instance !");<br /> <br /> peo.AddAllowedClass(typeof(BlockReference), false);<br /> <br /> PromptEntityResult per = ed.GetEntity(peo);<br /> <br /> if (per.Status != PromptStatus.OK) return;<br /> <br /> ObjectId id = per.ObjectId;<br /> <br /> using (Transaction tr = db.TransactionManager.StartTransaction())<br /> {<br /> Entity ent = (Entity)tr.GetObject(id, OpenMode.ForRead);<br /> <br /> if (ent == null) return;<br /> <br /> BlockReference bref = ent as BlockReference;<br /> <br /> if (bref == null) return;<br /> <br /> clon = bref.Clone() as BlockReference;<br /> <br /> clon.Rotation = 0;<br /> <br /> clon.TransformBy(ed.CurrentUserCoordinateSystem);<br /> <br /> tr.TransactionManager.QueueForGraphicsFlush();<br /> <br /> Extents3d ext = clon.GeometryExtentsBestFit(ed.CurrentUserCoordinateSystem);<br /> <br /> ext.TransformBy(ed.CurrentUserCoordinateSystem);<br /> <br /> Polyline pl = new Polyline(4);<br /> <br /> Point3d p1 = ext.MinPoint.TransformBy(ed.CurrentUserCoordinateSystem);<br /> <br /> Point3d p3 = ext.MaxPoint.TransformBy(ed.CurrentUserCoordinateSystem);<br /> <br /> Point3d p2 = new Point3d(p3.X, p1.Y, p1.Z).TransformBy(ed.CurrentUserCoordinateSystem);<br /> <br /> Point3d p4 = new Point3d(p1.X, p3.Y, p1.Z).TransformBy(ed.CurrentUserCoordinateSystem);<br /> <br /> pl.AddVertexAt(0, new Point2d(p1.X, p1.Y), 0.0, 0.0, 0.0);<br /> <br /> pl.AddVertexAt(1, new Point2d(p2.X, p2.Y), 0.0, 0.0, 0.0);<br /> <br /> pl.AddVertexAt(2, new Point2d(p3.X, p3.Y), 0.0, 0.0, 0.0);<br /> <br /> pl.AddVertexAt(3, new Point2d(p4.X, p4.Y), 0.0, 0.0, 0.0);<br /> <br /> pl.Closed = true;<br /> <br /> pl.ColorIndex = 121;<br /> <br /> pl.TransformBy(ed.CurrentUserCoordinateSystem);<br /> <br /> Matrix3d rot = Matrix3d.Rotation(bref.Rotation, bref.Normal.GetNormal(), bref.Position);<br /> <br /> pl.TransformBy(rot);<br /> <br /> BlockTableRecord btr = (BlockTableRecord)tr.GetObject(db.CurrentSpaceId, OpenMode.ForWrite);<br /> <br /> btr.AppendEntity(pl);<br /> <br /> tr.AddNewlyCreatedDBObject(pl, true);<br /> <br /> tr.TransactionManager.QueueForGraphicsFlush();<br /> <br /> doc.TransactionManager.FlushGraphics();<br /> <br /> tr.Commit();<br /> <br /> }<br /> }<br /> catch (System.Exception e)<br /> {<br /> ed.WriteMessage("\nError: {0}\n{1}", e.Message, e.StackTrace);<br /> }<br /> finally<br /> {<br /> if (!clon.IsDisposed) clon.Dispose();//optional<br /> }<br /> }

zzyong00

帮顶！。。。。。。

jun353835273

自己顶一下，看了下书自己解决了
http://bbs.mjtd.com/thread-180919-1-1.html