目录
Editor拖动类EntityJig选择集Editor
在C#进行CAD二次开发时，Editor类是一个特别有用的类。它提供了大量常用的接口函数，比如:
// 拖动相关接口public PromptPointResult Drag(SelectionSet selection, string message, DragCallback callback);public PromptResult Drag(Jig jig);public PromptPointResult Drag(PromptDragOptions options);// 获取点public PromptPointResult GetPoint(PromptPointOptions options);public PromptPointResult GetPoint(string message);// 获取选择集public PromptSelectionResult GetSelection(PromptSelectionOptions options, SelectionFilter filter);public PromptSelectionResult GetSelection(PromptSelectionOptions options);public PromptSelectionResult GetSelection(SelectionFilter filter);public PromptSelectionResult GetSelection();// 调用选择集相关接口public PromptSelectionResult SelectAll();public PromptSelectionResult SelectAll(SelectionFilter filter);public PromptSelectionResult SelectCrossingPolygon(Point3dCollection polygon);public PromptSelectionResult SelectCrossingPolygon(Point3dCollection polygon, SelectionFilter filter);public PromptSelectionResult SelectCrossingWindow(Point3d pt1, Point3d pt2, SelectionFilter filter, bool forceSubEntitySelection);public PromptSelectionResult SelectCrossingWindow(Point3d pt1, Point3d pt2);public PromptSelectionResult SelectCrossingWindow(Point3d pt1, Point3d pt2, SelectionFilter filter);public PromptSelectionResult SelectFence(Point3dCollection fence);public PromptSelectionResult SelectFence(Point3dCollection fence, SelectionFilter filter);public PromptSelectionResult SelectImplied();public PromptSelectionResult SelectLast();public PromptSelectionResult SelectPrevious();public PromptSelectionResult SelectWindow(Point3d pt1, Point3d pt2);public PromptSelectionResult SelectWindow(Point3d pt1, Point3d pt2, SelectionFilter filter);public PromptSelectionResult SelectWindowPolygon(Point3dCollection polygon);public PromptSelectionResult SelectWindowPolygon(Point3dCollection polygon, SelectionFilter filter);
Editor相当于CAD的编辑器，因此提供了大量的接口供我们使用，这里列举了其中一部分。关于Editor接口函数，需要不断的积累掌握。
拖动类EntityJig
实现代码，以模仿CAD绘制直线的命令为例
using Autodesk.AutoCAD.DatabaseServices;using Autodesk.AutoCAD.EditorInput;using Autodesk.AutoCAD.Geometry;using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace JigDemo{// 定义拖动类，继承EntityJigpublic class LineJig : EntityJig{private Point3d m_ptStart;private Point3d m_ptEnd;private string m_sMessage;private string[] m_sKeywords;/// <summary>/// 构造函数/// </summary>/// <param name="ptStart">直线起点</param>/// <param name="sMessage">命令行信息</param>/// <param name="sKeywords">关键字</param>public LineJig(Point3d ptStart, string sMessage, params string[] sKeywords):base(new Line()){m_ptStart = ptStart;m_sMessage = sMessage;m_sKeywords = sKeywords;((Line)Entity).StartPoint = ptStart;}/// <summary>/// 取样函数/// </summary>/// <param name="prompts">拖拽信息提示类，可获取结果</param>/// <returns></returns>protected override SamplerStatus Sampler(JigPrompts prompts){// 声明提示信息类JigPromptPointOptions jppo = new JigPromptPointOptions(m_sMessage);// 添加关键字for (int i = 0; i < m_sKeywords.Length; i++){jppo.Keywords.Add(m_sKeywords[i]);}char space = ' ';jppo.Keywords.Add(space.ToString());// 设置获取的信息类型jppo.UserInputControls = UserInputControls.Accept3dCoordinates; // 3d坐标点// 取消系统自动添加的关键字jppo.AppendKeywordsToMessage = false;PromptPointResult ppr = prompts.AcquirePoint(jppo);m_ptEnd = ppr.Value;return SamplerStatus.NoChange;}// 更新实体protected override bool Update(){((Line)Entity).EndPoint = m_ptEnd;return true;}// 获取实体public Entity GetEntity(){return Entity;}}}// 调用相关代码Editor editor = Application.DocumentManager.MdiActiveDocument.Editor;LineJig linejig = new LineJig(ptPre, "\n 指定下一点或[闭合(C)/放弃(U)]", new string[] {"C", "U" });PromptResult pr = editor.Drag(linejig);
选择集
可以直接调用Editor的相关接口，过滤器SelectionFilter
示例：
{Editor ed = Application.DocumentManager.MdiActiveDocument.Editor;TypedValue value = new TypedValue((int)DxfCode.Start, "CIRCLE"); // 实体类型名称 圆TypedValue[] values = new TypedValue[]{value}// 过滤器SelectionFilter filter = new SelectionFilter(values); PromptSelectionResult psr = ed.GetSelection(filter);if (psr.Status == PromptStatus.OK){// 选择集SelectionSet ss = psr.Value;ObjectId[] selIds = ss.GetObjectIds();}}
Editor提供了丰富的接口可供我们调用
比如public PromptSelectionResule SelectionImplied();函数，可以获取图面上已经选中的实体到结果选择集里面，此时要注意在写命令时，添加如下参数
[CommandMethod("PickFirst" , CommandFlags.UserPickSet)]
CommandMethod() 函数具有多种重载；CommandFlags 来表示命令函数具备的一些属性
