AutoCAD二次开发多个实体Jig拖拽(步骤模拟)

值中秋之际，和小伙伴出去后，借点时间看一下关于多实体实时拖拽效果（jig）,在AutoCAD中，通过鼠标的移动，动态的展示效果会给绘图者直观的感觉。在AutoCAD中关于拖拽有两个实现类，第一是EntityJig,另外一个是DrawJig类。其中前者只能针对一个实体，而另外一个是针对多个实体，可以实现拖拽效果。而对于前者者继承类中需要实现Sampler和Updata两个函数，Sampler用于数据的交互，比如提示用户输入一定的数据，Updata是用于接收数据后在图形界面实时更新。同EntityJig类，DrawJig也需要重写Samper函数，另外该类中含有WorldDraw函数需要重写，用于实时展示动态图形效果。

下面的这个测试demo是在图形界面拾取多个实体，然后再指定另外一个移动点，在Samper函数中提示用户拾取，将拾取的多个实体在WorldDraw中实时展示出来。整个工程的源代码如下所示。其中我们制作一个效果视屏。

这是jig实现类：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Autodesk.AutoCAD.EditorInput;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.Geometry;
using Autodesk.AutoCAD.GraphicsInterface;namespace MoveMultipleEntityJig
{public  class JigMoveMultipleEntity : DrawJig{private Point3d mBase;private Point3d mLocation;List<Entity> mEntities;public JigMoveMultipleEntity(Point3d basePt){mBase = basePt.TransformBy(UCS);mEntities = new List<Entity>();}public Point3d Base{get { return mLocation; }set { mLocation = value; }}public Point3d Location{get { return mLocation; }set { mLocation = value; }}public Matrix3d UCS{get{return Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.MdiActiveDocument.Editor.CurrentUserCoordinateSystem;}}public void AddEntity(Entity ent){mEntities.Add(ent);}public void TransformEntities(){Matrix3d mat = Matrix3d.Displacement(mBase.GetVectorTo(mLocation));foreach (Entity ent in mEntities){ent.TransformBy(mat);}}protected override SamplerStatus Sampler(JigPrompts prompts){JigPromptPointOptions prOptions1 = new JigPromptPointOptions("\n新的位置:");prOptions1.UseBasePoint = false;PromptPointResult prResult1 = prompts.AcquirePoint(prOptions1);if (prResult1.Status == PromptStatus.Cancel || prResult1.Status == PromptStatus.Error)return SamplerStatus.Cancel;if (!mLocation.IsEqualTo(prResult1.Value, new Tolerance(10e-10, 10e-10))){mLocation = prResult1.Value;return SamplerStatus.OK;}elsereturn SamplerStatus.NoChange;}protected override bool WorldDraw(Autodesk.AutoCAD.GraphicsInterface.WorldDraw draw){Matrix3d mat = Matrix3d.Displacement(mBase.GetVectorTo(mLocation));WorldGeometry geo = draw.Geometry;if (geo != null){geo.PushModelTransform(mat);foreach (Entity ent in mEntities){geo.Draw(ent);}geo.PopModelTransform();}return true;}}
}

这是使用的代码;

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.EditorInput;
using Autodesk.AutoCAD.Runtime;namespace MoveMultipleEntityJig
{public class Class1{public static JigMoveMultipleEntity jigger;[CommandMethod("tsjig")]public static void demo(){try{Database db = HostApplicationServices.WorkingDatabase;Editor ed = Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.MdiActiveDocument.Editor;PromptSelectionResult selRes = ed.GetSelection();if (selRes.Status != PromptStatus.OK) return;PromptPointOptions prOpt = new PromptPointOptions("\n选择基点:");PromptPointResult pr = ed.GetPoint(prOpt);if (pr.Status != PromptStatus.OK) return;jigger = new JigMoveMultipleEntity(pr.Value);using (Transaction tr = db.TransactionManager.StartTransaction()){foreach (ObjectId id in selRes.Value.GetObjectIds()){Entity ent = (Entity)tr.GetObject(id, OpenMode.ForWrite);jigger.AddEntity(ent);}PromptResult jigRes = Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.MdiActiveDocument.Editor.Drag(jigger);if (jigRes.Status == PromptStatus.OK){jigger.TransformEntities();tr.Commit();}elsetr.Abort();}}catch (System.Exception ex){Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.MdiActiveDocument.Editor.WriteMessage(ex.ToString());}}}
}

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