CAD二次开发 学习笔记-未完待续...

用EntityJig动态绘制一条直线

using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.EditorInput;
using Autodesk.AutoCAD.Geometry;
using Autodesk.AutoCAD.Runtime;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

[assembly: CommandClass(typeof(JigTest.LineJig))]
namespace JigTest
{
    /// 

    /// 命令类
    /// 
    public class LineJig
    {
        /// 

        /// 命令方法
        /// 
        [CommandMethod("linejig")]
        public void DoIt()
        {
            
            Editor ed = Application.DocumentManager.MdiActiveDocument.Editor;
            PromptPointOptions options = new PromptPointOptions("\n 指定起点");
            ed.WriteMessage("\n 准备接收用户输入的点");
            PromptPointResult result = ed.GetPoint(options);//阻塞方法
            ed.WriteMessage("\n 已获取用户输入的点");
            ed.WriteMessage($"\n 起点坐标：{result.Value.X},{result.Value.Y},{result.Value.Z}");
            Database db = Application.DocumentManager.MdiActiveDocument.Database;
            LineJigImpl jig = new LineJigImpl(result.Value);
            
            Application.DocumentManager.MdiActiveDocument.Editor.Drag(jig);
            
            using (Transaction tr = db.TransactionManager.StartTransaction())
            {
                BlockTable bt = tr.GetObject(db.BlockTableId, OpenMode.ForRead) as BlockTable;
                BlockTableRecord btr = tr.GetObject(bt[BlockTableRecord.ModelSpace], OpenMode.ForWrite) as BlockTableRecord;
                
                btr.AppendEntity(jig.GetEntity());
                tr.AddNewlyCreatedDBObject(jig.GetEntity(),true);
                tr.Commit();
            }
        }
    }
    /// 

    /// Jig实现类
    /// 
    class LineJigImpl : EntityJig
    {
        Point3d m_StartPoint, m_EndPoint;
        Editor editor = Application.DocumentManager.MdiActiveDocument.Editor;
        /// 

        /// 构造函数
        /// 
        /// 起点
        public LineJigImpl(Point3d start) : base(new Line())
        {
            editor.WriteMessage("\n 执行构造函数");
            m_StartPoint = start;
            editor.WriteMessage($"\n m_StartPoint初始值：{m_StartPoint}");
            editor.WriteMessage($"\n m_EndPoint默认值：{m_EndPoint}");
        }
        /// 

        /// 动态/即时/实时采样器
        /// 
        /// 即时提示
        /// 
        protected override SamplerStatus Sampler(JigPrompts prompts)
        {
            editor.WriteMessage("\n 执行Sampler;");
            JigPromptPointOptions options = new JigPromptPointOptions("\n 指定终点");
            options.UserInputControls =
                    UserInputControls.Accept3dCoordinates |
                    UserInputControls.NoZeroResponseAccepted |
                    UserInputControls.NoNegativeResponseAccepted;

                PromptPointResult result = prompts.AcquirePoint(options);
                Point3d tempPoint = result.Value;
                if (tempPoint != m_EndPoint) m_EndPoint = tempPoint;
                else return SamplerStatus.NoChange;
                if (result.Status == PromptStatus.Cancel) return SamplerStatus.Cancel;
                else return SamplerStatus.OK;
        }
        /// 

        /// （动态/即时/实时）更新显示/动态显示
        /// 
        /// 
        protected override bool Update()
        {
            editor.WriteMessage("\n 执行Update;");
            try
            {
                ((Line)Entity).StartPoint = m_StartPoint;
                ((Line)Entity).EndPoint = m_EndPoint;
                editor.WriteMessage($"\n m_EndPoint当前值：{m_EndPoint}");
            }
            catch (System.Exception)
            {
                return false;
            }
            return true;
        }
        /// 

        /// 获取实体，便于外部调用
        /// 
        /// 
        public Entity GetEntity()
        { return Entity; }
    }
}

运行结果

列出实体信息

[CommandMethod("listEntity")]
        public void ListEntity()
        {
            Database db = Application.DocumentManager.MdiActiveDocument.Database;
            Editor ed = Application.DocumentManager.MdiActiveDocument.Editor;
            using (Transaction tr = db.TransactionManager.StartTransaction())
            {
                BlockTable bt = tr.GetObject(db.BlockTableId, OpenMode.ForRead) as BlockTable;
                BlockTableRecord btr = tr.GetObject(bt[BlockTableRecord.ModelSpace], OpenMode.ForRead) as BlockTableRecord;
                ed.WriteMessage($"\ndb.BlockTableId:{db.BlockTableId}");
                ed.WriteMessage($"\nBlockTableRecord.ModelSpace:{BlockTableRecord.ModelSpace}");
                ed.WriteMessage($"\nbt[BlockTableRecord.ModelSpace]:{bt[BlockTableRecord.ModelSpace]}");

                ed.WriteMessage($"\n BlockBeginId:{btr.BlockBeginId}");
                ed.WriteMessage($"\n BlockEndId:{btr.BlockEndId}");
                ed.WriteMessage($"\n btr.Name:{btr.Name}");
                ed.WriteMessage($"\n btr.PathName:{btr.PathName}");
                ed.WriteMessage($"\n btr.Comments:{btr.Comments}");
                ed.WriteMessage($"\n --------------------------------");

                int count = 0;
                foreach (ObjectId entityId in btr)
                {
                    ed.WriteMessage($"\n 这是模型空间的第{count + 1}个实体，详细信息如下:");
                    ed.WriteMessage($"\nName:{entityId.ObjectClass.Name}");
                    ed.WriteMessage($"\nAppName:{entityId.ObjectClass.AppName}");
                    ed.WriteMessage($"\nDxfName:{entityId.ObjectClass.DxfName}");
                    count++;
                }
                ed.WriteMessage($"\n块表-模型空间-实体个数:{count}");
            }
        }

运行结果