using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Autodesk.AutoCAD.DatabaseServices; // (Database, DBPoint, Line, Spline)using Autodesk.AutoCAD.Geometry; //(Point3d, Line3d, Curve3d)using Autodesk.AutoCAD.ApplicationServices; // (Application, Document)using Autodesk.AutoCAD.Runtime; // (CommandMethodAttribute, RXObject, CommandFlag)using Autodesk.AutoCAD.EditorInput; //(Editor, PromptXOptions, PromptXResult)using AcadApp = Autodesk.AutoCAD.ApplicationServices.Application;
using Autodesk.AutoCAD.Colors;
namespace _05_多段线批量等间距法线绘制
{
public class Class1
{
// 获取当前活动文档 Document doc = Application.DocumentManager.MdiActiveDocument;
[CommandMethod("BCED")]
public void BatchCurveEquiDistance()
{
Database db = HostApplicationServices.WorkingDatabase;
Editor ed = Application.DocumentManager.MdiActiveDocument.Editor;
ed.WriteMessage("欢迎使用多段线等间距绘制法线程序n");
// 单选图元 ObjectId curveId = this.SelectEntity("n请选择一个多段线对象", typeof(Polyline));
// 判断是否选取了多段线对象 if (curveId != null)
{
using (Transaction trans = db.TransactionManager.StartTransaction())
{
Curve curEnt = trans.GetObject(curveId, OpenMode.ForRead) as Curve;
// 获取多段线终点 Point3d endPoint = curEnt.EndPoint;
// 多段线长度 double lineLength = curEnt.GetDistAtPoint(endPoint);
// 间隔距离 double dis = 10;
// 第一个点距离起点距离 double myDis = dis;
while (myDis < lineLength)
{
//获取距离起点 mydis 的多段线上的一个点 Point3d point = curEnt.GetPointAtDist(myDis);
//一阶导数 即切线向量 Vector3d curVector = curEnt.GetFirstDerivative(point);
//获取切线方向的垂线向量 (从切线得到法线) Vector3d curPervector = curVector.GetPerpendicularVector();
//向量转化成标准单位向量 curPervector = curPervector.GetNormal();
//起始点+ 单位向量*距离 就是距离起始点 距离向量长度的 一个点 Point3d newPoint = point.Add(curPervector * 10);
// 绘制直线 this.CreateLine(point, newPoint, 1);
// 间隔递增 myDis = myDis + dis;
}
trans.Commit();
}
}
}
/// /// 单选实体 /// /// /// /// public ObjectId SelectEntity(string message, Type enttype)
{
PromptEntityOptions opts = new PromptEntityOptions(message);
if (enttype != null)
{
opts.SetRejectMessage("选择图元类型错误，请重新选择" + enttype.ToString());
opts.AddAllowedClass(enttype, true);
}
PromptEntityResult res = doc.Editor.GetEntity(opts);
return res.ObjectId;
}
/// /// 创建直线 /// /// 直线起点 /// 直线终点 /// 直线颜色 /// 图层名称 public void CreateLine(Point3d strartPoint, Point3d endPoint, int Color)
{
// 获得数据库 Database db = doc.Database;
// 开启事务处理 using (Transaction trans = db.TransactionManager.StartTransaction())
{
// 以读模式打开块表 BlockTable bt = trans.GetObject(db.BlockTableId, OpenMode.ForRead) as BlockTable;
// 以写模式打开当前块表记录 model空间 BlockTableRecord btr = trans.GetObject(db.CurrentSpaceId, OpenMode.ForWrite) as BlockTableRecord;
Line line = new Line(strartPoint, endPoint);
line.ColorIndex = Color;
// 将创建的直线对象添加到Model空间 并进行事务登记 btr.AppendEntity(line);
trans.AddNewlyCreatedDBObject(line, true);
// 提交事务处理 trans.Commit();
}
}
}
}
