AutoCAD .Net EntityJig – Jig Line by Start and End Points

本实例展示使用 EntityJig 技术，动态交互模式创建直线。

翻译自: AutoCAD .NET: EntityJig – Jig Line by Start and End Points

using Autodesk.AutoCAD.Runtime;using Autodesk.AutoCAD.ApplicationServices;using Autodesk.AutoCAD.DatabaseServices;using Autodesk.AutoCAD.Geometry;using Autodesk.AutoCAD.EditorInput;public class JigLineSample{    [CommandMethod("JigLine")]    public static void JigLine()    {        Document doc = Application.DocumentManager.MdiActiveDocument;        if (LineJigger.Jig())        {            doc.Editor.WriteMessage("\nsuccess\n");        }        else        {            doc.Editor.WriteMessage("\nfailure\n");        }    }}public class LineJigger : EntityJig{    public Point3d endPnt = new Point3d();    public LineJigger(Line line)        : base(line)    {    }    protected override bool Update()    {        Document doc = Application.DocumentManager.MdiActiveDocument;        (Entity as Line).EndPoint = endPnt;        return true;    }    protected override SamplerStatus Sampler(JigPrompts prompts)    {        Document doc = Application.DocumentManager.MdiActiveDocument;        JigPromptPointOptions prOptions1 = new JigPromptPointOptions("\nNext point:");        prOptions1.BasePoint = (Entity as Line).StartPoint;        prOptions1.UseBasePoint = true;        prOptions1.UserInputControls = UserInputControls.Accept3dCoordinates            | UserInputControls.AnyBlankTerminatesInput             | UserInputControls.GovernedByOrthoMode             | UserInputControls.GovernedByUCSDetect             | UserInputControls.UseBasePointElevation            | UserInputControls.InitialBlankTerminatesInput             | UserInputControls.NullResponseAccepted;        PromptPointResult prResult1 = prompts.AcquirePoint(prOptions1);        if (prResult1.Status == PromptStatus.Cancel)            return SamplerStatus.Cancel;        if (prResult1.Value.Equals(endPnt))        {            return SamplerStatus.NoChange;        }        else        {            endPnt = prResult1.Value;            return SamplerStatus.OK;        }    }    #region    public static bool Jig()    {        try        {            Document doc = Application.DocumentManager.MdiActiveDocument;            Database db = doc.Database;            PromptPointResult ppr = doc.Editor.GetPoint("\nStart point:");            if (ppr.Status != PromptStatus.OK)                return false;            Point3d pt = ppr.Value;            Line line = new Line(pt, pt);            line.TransformBy(doc.Editor.CurrentUserCoordinateSystem);            LineJigger jigger = new LineJigger(line);            PromptResult pr = doc.Editor.Drag(jigger);            if (pr.Status == PromptStatus.OK)            {                using (Transaction tr = db.TransactionManager.StartTransaction())                {                    BlockTable bt = tr.GetObject(db.BlockTableId,                        OpenMode.ForRead) as BlockTable;                    BlockTableRecord modelSpace = tr.GetObject(                        bt[BlockTableRecord.ModelSpace],                        OpenMode.ForWrite) as BlockTableRecord;                    modelSpace.AppendEntity(jigger.Entity);                    tr.AddNewlyCreatedDBObject(jigger.Entity, true);                    tr.Commit();                }            }            else            {                line.Dispose();                return false;            }            return true;        }        catch        {            return false;        }    }    #endregion}