cad c# 利用drawjig 动态移动，旋转

可以使用C#中的DrawJig类来实现动态移动和旋转。DrawJig类是用于绘制交互图形的基类，它提供了许多方法来实现交互式绘图。

以下是使用DrawJig类实现动态移动和旋转的示例代码：

using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.EditorInput;
using Autodesk.AutoCAD.Geometry;
using Autodesk.AutoCAD.Runtime;
using Autodesk.AutoCAD.GraphicsInterface;

namespace DynamicMoveRotate
{
    public class MyDrawJig : DrawJig
    {
        private Point3d _basePoint;
        private Vector3d _normal;
        private double _angle;
        private bool _move;

        public MyDrawJig(Point3d basePoint, Vector3d normal)
        {
            _basePoint = basePoint;
            _normal = normal;
            _angle = 0.0;
            _move = true;
        }

        protected override SamplerStatus Sampler(JigPrompts prompts)
        {
            if (_move)
            {
                JigPromptPointOptions jppo = new JigPromptPointOptions("\n指定移动点: ");
                PromptPointResult ppr = prompts.AcquirePoint(jppo);

                if (ppr.Status == PromptStatus.Cancel)
                    return SamplerStatus.Cancel;

                if (_basePoint.DistanceTo(ppr.Value) > Tolerance.Global.EqualPoint)
                {
                    _move = false;
                    _angle = _normal.GetAngleTo(ppr.Value - _basePoint);
                }
            }
            else
            {
                JigPromptAngleOptions jpa = new JigPromptAngleOptions("\n指定旋转角度: ");
                jpa.BasePoint = _basePoint;
                jpa.UseBasePoint = true;

                PromptDoubleResult pdr = prompts.AcquireAngle(jpa);

                if (pdr.Status == PromptStatus.Cancel)
                    return SamplerStatus.Cancel;

                _angle = pdr.Value;
            }

            return SamplerStatus.OK;
        }

        protected override bool WorldDraw(WorldDraw draw)
        {
            Vector3d axis = _normal.GetPerpendicularVector();
            Matrix3d mat = Matrix3d.Rotation(_angle, axis, _basePoint);
            draw.Geometry.Draw(new Line(_basePoint, _basePoint.TransformBy(mat)));

            return true;
        }

        public ResultBuffer Run()
        {
            Document doc = Application.DocumentManager.MdiActiveDocument;
            Editor ed = doc.Editor;

            PromptEntityOptions peo = new PromptEntityOptions("\n选择实体: ");
            peo.SetRejectMessage("\n只能选择直线或圆弧!");
            peo.AddAllowedClass(typeof(Line), true);
            peo.AddAllowedClass(typeof(Circle), true);

            PromptEntityResult per = ed.GetEntity(peo);

            if (per.Status != PromptStatus.OK)
                return null;

            using (Transaction tr = doc.TransactionManager.StartTransaction())
            {
                Entity ent = tr.GetObject(per.ObjectId, OpenMode.ForWrite) as Entity;
                if (ent == null)
                    return null;

                _basePoint = ent.GeometricExtents.MinPoint;
                _normal = ent.GetPlane().Normal;

                MyDrawJig jig = new MyDrawJig(_basePoint, _normal);
                PromptResult pr = ed.Drag(jig);

                if (pr.Status != PromptStatus.OK)
                    return null;

                Matrix3d mat = Matrix3d.Rotation(jig.Angle, _normal, _basePoint);
                ent.TransformBy(mat);

                tr.Commit();
            }

            return new ResultBuffer(new TypedValue[] { new TypedValue((int)DxfCode.Start, per.ObjectId) });
        }
    }

    public class Commands
    {
        [CommandMethod("DYNMOVE")]
        public void DynamicMove()
        {
            MyDrawJig jig = new MyDrawJig(Point3d.Origin, Vector3d.ZAxis);
            jig.Run();
        }
    }
}

在这个示例中，我们创建了一个名为MyDrawJig的派生类来实现DrawJig。在Sampler方法中，我们首先采集移动点，然后在旋转点上采集旋转角度。在WorldDraw方法中，我们绘制了一个直线来表示移动和旋转的效果。最后，在Run方法中，我们选择实体，然后调用Drag方法来启动交互式绘图操作。

要使用此命令，请打开AutoCAD并输入"DYNMOVE"命令。然后，选择要移动和旋转的实体，按照提示来指定移动点和旋转角度即可。