CAD中的选择集过滤----有条件选择AutoCAD实体_cad 过滤组码 sewp

 

转载自：http://www.cnblogs.com/jdmei520/articles/1326120.html

一、选择集过滤时的使用方式如下：

Object 指使用SelectionSet这个方法适用的对象

1)      object.Select Mode[, Point1][, Point2][, FilterType][, FilterData] 

2)      object.SelectOnScreen [FilterType][, FilterData] 

3)      object.SelectAtPoint Point, FilterType, FilterData 

FilterType:Variant[变体](整数数组); 仅用于输入;(可选项) 指定使用的过滤器类型的 DXF 组码。

FilterData:Variant[变体](变体数组); 仅用于输入;(可选项) 过滤器的值。

二、DXF群组码共同群组码代码一览表

三、过滤群组方式

- FilterType (DXF 群组码) = -4

四、范例：

1、过滤条件为图元为MTEXT

图元是MTEXT

2、过滤条件为图元为CIRCLE或LINE

图元是CIRCLE OR 图元是LINE

3、过滤条件为图元在DIM 图层(LAYER)中的CIRCLE或LINE

  (图元是CIRCLE OR 图元是LINE) AND 图层位于DIM层

4、过滤的条件为图元为CIRCLE或LINE但图层(LAYER)不属于DIM层

(图元是CIRCLE OR 图元是LINE) AND NOT(图层位于DIM层)

 

 

让我们看一个实例：我们想要选择层0上的所有直线和所有直径大于10的圆，该如何组合条件呢？

Let's take a concrete example: let's say we want to select all lines on on layer 0 and all the circles with radii greater than 10.'s how we would compose the conditions, in pseudo-code:

• <or
  • <and
    • Layer == "0"
    • Entity type == "LINE"
  • and>
  • <and
    • Entity type == "CIRCLE"
    • Radius >= 10.0
  • and>
• or>

转换为c#如下代码：为清楚起见，此处我把指定的属性/值以硬编码的形式实现，另如果需要应该直接由用户从数据库中进行选择。

This translates into the following C# code - for clarity I've left the specific properties/values hard-coded, but clearly it would be straightforward to ask the user or pick them out of a database, as needed.

using Autodesk.AutoCAD.ApplicationServices;
 using Autodesk.AutoCAD.Runtime;
 using Autodesk.AutoCAD.DatabaseServices;
 using Autodesk.AutoCAD.EditorInput;
 
 namespace EntitySelection
  {
     public class Commands
      {
         [CommandMethod("SEWP")]
         public static void SelectEntitiesWithProperties()
          {
             Document doc = Application.DocumentManager.MdiActiveDocument;
             Editor ed = doc.Editor;
 
             // Build a conditional filter list so that only
             // entities with the specified properties are
             // selected
             TypedValue[] tvs = new TypedValue[] 
              {
                 new TypedValue((int)DxfCode.Operator, "<or"),
                 new TypedValue((int)DxfCode.Operator, "<and"),
                 new TypedValue((int)DxfCode.LayerName, "0"),
                 new TypedValue((int)DxfCode.Start, "LINE"),
                 new TypedValue((int)DxfCode.Operator, "and>"),
                 new TypedValue((int)DxfCode.Operator, "<and"),
                 new TypedValue((int)DxfCode.Start, "CIRCLE"),
                 new TypedValue((int)DxfCode.Operator, ">="),
                 new TypedValue((int)DxfCode.Real, 10.0),// Circle Radius
                 new TypedValue((int)DxfCode.Operator, "and>"),
                 new TypedValue((int)DxfCode.Operator, "or>")
             };
 
             SelectionFilter sf = new SelectionFilter(tvs);
             PromptSelectionResult psr = ed.SelectAll(sf);
             if (psr.Status == PromptStatus.OK)
              {
                 SelectionSet SS = psr.Value;
                 ObjectId[] idArray = SS.GetObjectIds();
                 for (int i = 0; i < idArray.Length; i++)
                  {
                     Entity ent = (Entity)Tools.GetDBObject(idArray[i]);
                     ent.Highlight();
                     Tools.WriteMessage(i + ":" + ent.ObjectId.ToString() + "," + ent.GetType().Name);
                 }
             }
 
         }
 
     }//end class
 }

 

--------------编辑于2019/6/2 -----------
看到有人回复说没有Tools,其实所谓的Tools就是一个自定义类文件，然后里面定义了WriteMessage方法。出自的是 曾洪飞 卢择临 张帆著的《AutoCAD VBA&VB.NET开发基础与实例教程(第2版)(C#版)》

        /// <summary>
        /// 在命令行输出信息
        /// </summary>
        /// <param name="ed">命令行对象</param>
        /// <param name="message">要输出的信息</param>
        public static void WriteMessage(this Editor ed, object message)
        {
            ed.WriteMessage(message.ToString());
        }