c# CAD二次开发 类库 创建各种图形、直线、圆、多段线、正方形、点等

c# CAD二次开发 类库 创建各种图形、直线、圆、多段线、正方形、点等 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 _02创建图形 { public static partial class AddEntityTool { /// /// 将图形对象添加到图形文件中 /// /// 图形数据库 /// 图形对象 /// 图形的ObjectId public static ObjectId AddEnityToModelSpace(this Database db,Entity ent) { //声明ObjectId,用于返回 ObjectId entId = ObjectId.Null; //开启事务处理 using (Transaction trans = db.TransactionManager.StartTransaction()) { //打开块表 BlockTable bt = (BlockTable)trans.GetObject(db.BlockTableId, OpenMode.ForRead); //打开块表记录 BlockTableRecord btr = (BlockTableRecord)trans.GetObject(bt[BlockTableRecord.ModelSpace], OpenMode.ForWrite); //添加图形到块表记录 entId = btr.AppendEntity(ent); //更新数据信息 trans.AddNewlyCreatedDBObject(ent, true); //提交事务 trans.Commit(); } return entId; } /// /// 将图形对象添加到图形文件中 /// /// 图形数据库 /// 图形对象,可变参数 /// 图形的ObjectId,数组返回 public static ObjectId[] AddEnityToModelSpace(this Database db, params Entity[] ent) { //声明ObjectId,用于返回 ObjectId[] entId = new ObjectId[ent.Length]; //开启事务处理 using (Transaction trans = db.TransactionManager.StartTransaction()) { //打开块表 BlockTable bt = (BlockTable)trans.GetObject(db.BlockTableId, OpenMode.ForRead); //打开块表记录 BlockTableRecord btr = (BlockTableRecord)trans.GetObject(bt[BlockTableRecord.ModelSpace], OpenMode.ForWrite);

for (int i = 0; i < ent.Length; i++) { //添加图形到块表记录 entId[i] = btr.AppendEntity(ent[i]); //更新数据信息 trans.AddNewlyCreatedDBObject(ent[i], true); }

//提交事务 trans.Commit(); } return entId; } /// /// 绘制直线 /// /// 图形数据库 /// 起点坐标 /// 终点坐标 /// ObjectId public static ObjectId AddLineToModelSpace(this Database db, Point3d startPoint, Point3d endPoint) { return db.AddEnityToModelSpace(new Line(startPoint, endPoint)); } /// /// 绘制直线 /// /// 图形数据库 /// 起点坐标 /// 直线长度 /// 与X轴正方向的角度 /// ObjectId public static ObjectId AddLineToModelSpace(this Database db, Point3d startPoint, Double length, Double degree) { //计算终点坐标 double X = startPoint.X + length * Math.Cos(degree.DegreeToAngle()); double Y = startPoint.Y + length * Math.Sin(degree.DegreeToAngle()); Point3d endPoint = new Point3d(X,Y,0); return db.AddEnityToModelSpace(new Line(startPoint, endPoint)); } /// /// 绘制圆弧 /// /// 图形数据库 /// 圆弧所在圆的圆心点 /// 圆弧的半径 /// 圆弧的起始角度 /// 圆弧的终止角度 /// ObjectId public static ObjectId AddArcToModelSpace(this Database db, Point3d center, double radius, double startDegree, double endDegree) { return db.AddEnityToModelSpace(new Arc(center, radius, startDegree.DegreeToAngle(), endDegree.DegreeToAngle())); } /// /// 通过三点创建圆弧 /// /// 图形数据库 /// 起点 /// 圆弧上的点 /// 终点 /// public static ObjectId AddArcToModelSpace(this Database db, Point3d startPoint, Point3d pointOnArc, Point3d endPoint) { //先判断三点是否在同一条直线上 if (startPoint.IsOnOneLine(pointOnArc,endPoint)) { return ObjectId.Null; }

//创建几何类对象 CircularArc3d cArc = new CircularArc3d(startPoint, pointOnArc, endPoint); //通过几何类对象获取其属性 //double radius = cArc.Radius; //半径 //Point3d center = cArc.Center; //所在圆的圆心 //Vector3d cs = center.GetVectorTo(startPoint); //圆心到起点的向量 //Vector3d ce = center.GetVectorTo(endPoint); //圆心到终点的向量 //Vector3d xVector = new Vector3d(1, 0, 0); //X正方向的向量 圆弧的起始角度 //double startAngle = cs.Y > 0 ? xVector.GetAngleTo(cs) : -xVector.GetAngleTo(cs); 圆弧的终止角度 //double endAngle = ce.Y > 0 ? xVector.GetAngleTo(ce) : -xVector.GetAngleTo(ce);

}