获取圆心点和直线的两个端点

chpmould · 发表于 2010-12-13 23:15:00

请教老师：当运行程序时选择一些圆和线，分别获取圆心点和直线的两个端点，并在获取的圆心点和直线的两个端点处各绘制一个圆...
效果如下图片：

nxtnr5r0hdm.gif

cdinten · 发表于 2010-12-14 10:02:00

这……你写程序的时候有什么具体的问题？

chpmould · 发表于 2010-12-14 10:50:00

关键是不知如何窗选实体,并得到圆心点和直线的端点...

sailorcwx · 发表于 2010-12-14 12:54:00

圆心是圆的Center属性
直线的端点是直线的StartPoint属性和EndPoint属性
            Line l;
            Circle c;
            Point3d pt1=l.StartPoint;
            Point3d pt2= l.EndPoint;
            Point3d pt3= c.Center;

chpmould · 发表于 2010-12-14 13:39:00

如何创建一个选择集来获取,最好有个简单的例子,我想这样比较容易理解...

sxpd · 发表于 2010-12-14 13:51:00

ed.GetSelXXX...

sailorcwx · 发表于 2010-12-14 16:04:00

[CommandMethod("tt2")]
      public void testfunction2()
      {
         Document doc = Application.DocumentManager.MdiActiveDocument;
         Editor ed =doc.Editor;
         Database db = HostApplicationServices.WorkingDatabase;
         SelectionFilter sf = new SelectionFilter(new TypedValue[] { new TypedValue(0,"Line,Circle") });
         PromptSelectionResult psr = ed.GetSelection(sf);
         if (psr.Status != PromptStatus.OK)
            return;
         using (Transaction tr=db.TransactionManager.StartTransaction())
         {
            BlockTableRecord curSpace=tr.GetObject(db.CurrentSpaceId, OpenMode.ForWrite) as BlockTableRecord;
         foreach (ObjectId id in psr.Value.GetObjectIds())
         {
            Entity ent = tr.GetObject(id, OpenMode.ForRead) as Entity;
            if (ent.GetType() == typeof(Line))
            {
                  Line l = ent as Line;
                  Point3d pt1 = l.StartPoint;
                  Point3d pt2 = l.EndPoint;
                  Circle c1 = new Circle(pt1, Vector3d.ZAxis, 1);
                  Circle c2 = new Circle(pt2, Vector3d.ZAxis, 1);
                  curSpace.AppendEntity(c1);
                  curSpace.AppendEntity(c2);
                  tr.AddNewlyCreatedDBObject(c1, true);
                  tr.AddNewlyCreatedDBObject(c2, true);
            }
            else
            {
                  Circle c = ent as Circle;
                  Point3d pt = c.Center;
                  Circle c1 = new Circle(pt, Vector3d.ZAxis, 1);
                  curSpace.AppendEntity(c1);
                  tr.AddNewlyCreatedDBObject(c1, true);
            }

         }
         tr.Commit();
         }
      }