C# CAD二次开发通过代码模拟 人工 画齿轮的算法思路

 [CommandMethod("FirstLine")]
        public void FirstLine()
        {
            Editor ed = Application.DocumentManager.MdiActiveDocument.Editor;
            //Thread th = new Thread(SayHello);
            //th.IsBackground = true;
            //th.Start();
 
            ed.WriteMessage("\n开始执行FirstLine\n");
 
            //获取当前活动图形数据库
            Database db = HostApplicationServices.WorkingDatabase;
 
            Point3d startPoint = new Point3d(0, 1000, 0);
            Point3d endPoint = new Point3d(0, 500, 0);
            Line line = new Line(startPoint, endPoint);
 
 
            Circle circle1 = new Circle(Point3d.Origin, Vector3d.ZAxis, 480);
 
            Point3dCollection pc1 = new Point3dCollection();
            circle1.IntersectWith(new Line(new Point3d(400,140,0), new Point3d(540, 60, 0)),
            Intersect.OnBothOperands, pc1, IntPtr.Zero, IntPtr.Zero);
 
            Point3dCollection pc2 = new Point3dCollection();
            circle1.IntersectWith(new Line(new Point3d(400, -140, 0), new Point3d(540, -60, 0)),
            Intersect.OnBothOperands, pc2, IntPtr.Zero, IntPtr.Zero);
 
            //以下画多段线
            Point2dCollection point2Ds = new Point2dCollection();
            point2Ds.Add(new Point2d(pc1[0].X,pc1[0].Y));
            //point2Ds.Add(new Point2d(400, 140));
            point2Ds.Add(new Point2d(540, 60));
            point2Ds.Add(new Point2d(540, -60));
            //point2Ds.Add(new Point2d(400, -140));
            point2Ds.Add(new Point2d(pc2[0].X, pc2[0].Y));
            Polyline polyline = new Polyline();
 
 
            int tmp = 0;
            foreach (var point2D in point2Ds)
            {
                polyline.AddVertexAt(tmp++,point2D,0,1,1);
            }
            
            Circle circle = new Circle(Point3d.Origin,Vector3d.ZAxis,400);
           
            using (Transaction trans = db.TransactionManager.StartTransaction())
            {             
                BlockTable bt = (BlockTable)trans.GetObject(db.BlockTableId, OpenMode.ForRead);                
                BlockTableRecord btr = (BlockTableRecord)trans.GetObject(bt[BlockTableRecord.ModelSpace], OpenMode.ForWrite);
               // btr.AppendEntity(line);
                btr.AppendEntity(polyline);
               // trans.AddNewlyCreatedDBObject(line, true);
                trans.AddNewlyCreatedDBObject(polyline, true);
                trans.Commit();
            }
 
            //line.ObjectId.ArrayPolarEntity(12, 360, new Point3d(0, 0, 0));
            List ents= polyline.ObjectId.ArrayPolarEntity(12, 360, new Point3d(0, 0, 0));
 
            using (Transaction trans = db.TransactionManager.StartTransaction())
            {
                
                BlockTable bt = (BlockTable)trans.GetObject(db.BlockTableId, OpenMode.ForRead);                
                BlockTableRecord btr = (BlockTableRecord)trans.GetObject(bt[BlockTableRecord.ModelSpace], OpenMode.ForWrite);
                
                Point2d pStart, pEnd;
                Point3d pt1, pt2;
                CircularArc3d geArc = new CircularArc3d(circle1.Center, Vector3d.ZAxis, circle1.Radius);
                for (int i = 0; i < ents.Count; i++)
                {
                    Polyline pl = (Polyline)ents[i];
                    Polyline pl1 = (Polyline)ents[(i+1)%ents.Count];
                    
                    pStart = pl.GetPoint2dAt(0);
                    pEnd = pl1.GetPoint2dAt(pl.NumberOfVertices - 1);
 
 
                    pt1 = new Point3d(pStart.X, pStart.Y, 0);
                    pt2 = new Point3d(pEnd.X,pEnd.Y,0);
                    Arc arc =new Arc();
                    arc.Center = geArc.Center;
                    arc.Radius = geArc.Radius;
                    arc.StartAngle = pt1.AngleFromXAxis(geArc.Center);
                    arc.EndAngle = pt2.AngleFromXAxis(geArc.Center);
                    
 
                    btr.AppendEntity(arc);
                    trans.AddNewlyCreatedDBObject(arc, true);
                } 
                
                btr.AppendEntity(circle);
                trans.AddNewlyCreatedDBObject(circle, true);
 
                trans.Commit();//提交事务
            }
 
 
            System.Diagnostics.Debug.WriteLine("FirstLine 已经执行");
        }

using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.Geometry;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
 
namespace 块
{
    static class Class2
    {
        public static double AngleFromXAxis(this Point3d pt1, Point3d pt2)
        { 
            Vector2d vector=new Vector2d(pt1.X-pt2.X, pt1.Y-pt2.Y);
            return vector.Angle;
        }
        public static double DegreeToAngle(this Double degree)
        {
            return degree * Math.PI / 180;
        }
        /// 
        /// 弧度转换角度
        /// 
        /// 弧度制
        /// 
        public static double AngleToDegree(this Double angle)
        {
            return angle * 180 / Math.PI;
        }
 
 
        /// 
        /// 环形阵列
        /// 
        /// 图形对象的ObjectId
        /// 图形数量
        /// 中心点到各个图形的夹角
        /// 中心点
        /// List  已经加入图形数据库
        public static List ArrayPolarEntity(this ObjectId entId, int num, double degree, Point3d center)
        {
            // 声明一个List集合 用于返回
            List entList = new List();
            // 打开事务处理
            using (Transaction trans = entId.Database.TransactionManager.StartTransaction())
            {
                // 打开块表
                BlockTable bt = (BlockTable)trans.GetObject(entId.Database.BlockTableId, OpenMode.ForRead);
                // 打开块表记录
                BlockTableRecord btr = (BlockTableRecord)trans.GetObject(bt[BlockTableRecord.ModelSpace], OpenMode.ForWrite);
                Entity ent = (Entity)entId.GetObject(OpenMode.ForWrite);
                // 限定阵列角度大小
                degree = degree > 360 ? 360 : degree;
                degree = degree < -360 ? 360 : degree;
                int divAngnum = num - 1;
                if (degree == 360 || degree == -360)
                {
                    divAngnum = num;
                }
                // 计算变换矩阵
                for (int i = 0; i < num; i++)
                {
                    Matrix3d mt = Matrix3d.Rotation((i * degree / divAngnum).DegreeToAngle(), Vector3d.ZAxis, center);
                    Entity entA = ent.GetTransformedCopy(mt);
                    btr.AppendEntity(entA);
                    trans.AddNewlyCreatedDBObject(entA, true);
                    entList.Add(entA);
                }
                ent.Erase();
                trans.Commit();
            }
            return entList;
        }
    }
}