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ObjectARX 开发指南

使用选择筛选器定义选择集规则（.NET）

2023-1-1 14:25| 发布者: admin| 查看: 524| 评论: 0|来自: AutoCAD

选择过滤器由形式的参数对组成。a 的第一个参数标识筛选器的类型（例如，对象），第二个参数指定要筛选的值（例如，圆圈）。筛选器类型是指定要使用的筛选器的 DXF 组代码。此处列出了一些最常见的筛选器类型。TypedValuesTypedValue

常见过滤器的 DXF 代码
DXF 代码	过滤器类型
0（或 DxfCode.Start）	对象类型（字符串）如“线”、“圆”、“弧”等。
2（或 DxfCode.BlockName）	块名称（字符串）插入参照的块名。
8 或（DxfCode.LayerName）	图层名称（字符串）如“第 0 层”。
60 （DxfCode.Visibility）	对象可见性（整数）使用 0 = 可见，1 = 不可见。
62（或 DxfCode.Color）	颜色数字（整数）数字索引值的范围为 0 到 256。零表示 BYBLOCK。256 表示 BYLAYER。负值表示图层已关闭。
67	模型/图纸空间指示器（整数）使用 0 或省略 = 模型空间，1 = 图纸空间。

为选择集指定单个选择条件

以下代码提示用户选择要包括在选择集中的对象，并筛选出除圆圈之外的所有对象。

VB.NET

Imports Autodesk.AutoCAD.Runtime
Imports Autodesk.AutoCAD.ApplicationServices
Imports Autodesk.AutoCAD.DatabaseServices
Imports Autodesk.AutoCAD.EditorInput
 
<CommandMethod("FilterSelectionSet")> _
Public Sub FilterSelectionSet()
    '' Get the current document editor
    Dim acDocEd As Editor = Application.DocumentManager.MdiActiveDocument.Editor

    '' Create a TypedValue array to define the filter criteria
    Dim acTypValAr(0) As TypedValue
    acTypValAr.SetValue(New TypedValue(DxfCode.Start, "CIRCLE"), 0)

    '' Assign the filter criteria to a SelectionFilter object
    Dim acSelFtr As SelectionFilter = New SelectionFilter(acTypValAr)

    '' Request for objects to be selected in the drawing area
    Dim acSSPrompt As PromptSelectionResult
    acSSPrompt = acDocEd.GetSelection(acSelFtr)

    '' If the prompt status is OK, objects were selected
    If acSSPrompt.Status = PromptStatus.OK Then
        Dim acSSet As SelectionSet = acSSPrompt.Value

        Application.ShowAlertDialog("Number of objects selected: " & _
                                    acSSet.Count.ToString())
    Else
        Application.ShowAlertDialog("Number of objects selected: 0")
    End If
End Sub

C#

using Autodesk.AutoCAD.Runtime;
using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.EditorInput;
 
[CommandMethod("FilterSelectionSet")]
public static void FilterSelectionSet()
{
    // Get the current document editor
    Editor acDocEd = Application.DocumentManager.MdiActiveDocument.Editor;

    // Create a TypedValue array to define the filter criteria
    TypedValue[] acTypValAr = new TypedValue[1];
    acTypValAr.SetValue(new TypedValue((int)DxfCode.Start, "CIRCLE"), 0);

    // Assign the filter criteria to a SelectionFilter object
    SelectionFilter acSelFtr = new SelectionFilter(acTypValAr);

    // Request for objects to be selected in the drawing area
    PromptSelectionResult acSSPrompt;
    acSSPrompt = acDocEd.GetSelection(acSelFtr);

    // If the prompt status is OK, objects were selected
    if (acSSPrompt.Status == PromptStatus.OK)
    {
        SelectionSet acSSet = acSSPrompt.Value;

        Application.ShowAlertDialog("Number of objects selected: " +
                                    acSSet.Count.ToString());
    }
    else
    {
        Application.ShowAlertDialog("Number of objects selected: 0");
    }
}

VBA/ActiveX 代码参考

Sub FilterSelectionSet()
    ' Create a new selection set
    Dim sset As AcadSelectionSet
    Set sset = ThisDrawing.SelectionSets.Add("SS1")
 
    ' Define the filter list, only Circle objects
    ' will be selectable
    Dim FilterType(0) As Integer
    Dim FilterData(0) As Variant
    FilterType(0) = 0
    FilterData(0) = "Circle"
 
    ' Prompt the user to select objects
    ' and add them to the selection set
    sset.SelectOnScreen FilterType, FilterData
 
    MsgBox "Number of objects selected: " & sset.Count
 
    ' Remove the selection set at the end
    sset.Delete
End Sub