cadjig.txt

cad二次开发中实现拖动效果 jig的实例 C#语言

这个周末主要的学习内容就是研究c# arx中拖动效果的显示，下面是代码和介绍：
1，实体绘制的拖动效果（多段线为例）
using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.EditorInput;
using Autodesk.AutoCAD.Runtime;
using Autodesk.AutoCAD.Geometry;
namespace MyPlineApp
{
 public class MyPlineCmds
 {
  class PlineJig : EntityJig
  {
      //维护一个顶点列表，不一定需要，因为这会存储到polyline，不会相反地影响性能 
      Point3dCollection m_pts;
      //用于存储新近的点的变量，不一定需要，但更容易使用
      Point3d m_tempPoint;
      Plane m_plane;
      public PlineJig(Matrix3d ucs)
          : base(new Polyline())
      {
          m_pts = new Point3dCollection();
          Point3d origin = new Point3d(0, 0, 0); //创建一个临时plane来帮助计算
          Vector3d normal = new Vector3d(0, 0, 1);
          normal = normal.TransformBy(ucs); //法线变换到指定的UCS下
          m_plane = new Plane(origin, normal);
          //创建polyline,设置其属性为默认值，并添加虚构的顶点
          Polyline pline = Entity as Polyline; //as把Entity转化为as后指定的实体类型
          //设置实体的颜色，层等属性为其当前驻留的数据库的默认值，若实体不在数据库//中，就设置为当前数据库的值
          pline.SetDatabaseDefaults();
          pline.Normal = normal;
          pline.AddVertexAt(0, new Point2d(0, 0), 0, 0, 0);
      }
      //采样函数：用于在Drag的时候不断地采样
      protected override SamplerStatus Sampler(JigPrompts prompts)
      {
          JigPromptPointOptions jigOpts = new JigPromptPointOptions();
          jigOpts.UserInputControls = (UserInputControls.Accept3dCoordinates |
  UserInputControls.NullResponseAccepted |
  UserInputControls.NoNegativeResponseAccepted);
          if (m_pts.Count == 0) //请求第一个顶点
  {
              jigOpts.Message = "\nStart point of polyline: ";
          } else if (m_pts.Count > 0) //对随后的点，顺次以前一点为基点，以实现Drag
  {
              jigOpts.BasePoint = m_pts[m_pts.Count - 1];
              jigOpts.UseBasePoint = true;
              jigOpts.Message = "\nPolyline vertex: ";
          } else //应该不会发生的情况
              return SamplerStatus.Cancel;
          //得到这次采样的点
          PromptPointResult res = prompts.AcquirePoint(jigOpts);
          //检查采样点是否变化，这是为了减少闪动
          if (m_tempPoint == res.Value) {
              return SamplerStatus.NoChange;
          } else if (res.Status == PromptStatus.OK) {
              m_tempPoint = res.Value;
              return SamplerStatus.OK;
          }
          return SamplerStatus.Cancel;
      }
      //更新函数：用采样得到的数据更新被拖动的实体
      protected override bool Update()
      {
          //更新顶点，先要把点映射到指定的平面，注意把原来的虚构的顶点代替掉，
          Polyline pline = Entity as Polyline;
          pline.SetPointAt(pline.NumberOfVertices - 1, m_tempPoint.Convert2d(m_plane));
          return true;
      }
      public Entity GetEntity()
      {
          return Entity;
      }
      //总是设置polyline为一个虚构的点，在完成Drag后，此点会被移除
      public void AddLatestVertex()
      {
          //添加最近被选择的点到一个内部列表中，即m_pts，这个点已经
          //被添加到polyline中了
          m_pts.Add(m_tempPoint);
          Polyline pline = Entity as Polyline;
          //创建一个虚构的点，此点的值可是任意的值
          pline.AddVertexAt(pline.NumberOfVertices, new Point2d(0, 0), 0, 0, 0);
      }
      public void RemoveLastVertex()//用于在完成Drag后，移除最后个虚构的点
      {
          Polyline pline = Entity as Polyline;
          pline.RemoveVertexAt(m_pts.Count);
      }
  }
 }
  [CommandMethod("MYPOLY")]
  public void MyPolyJig()
  {
   Document doc = Application.DocumentManager.MdiActiveDocument;
   Editor ed = doc.Editor;
   //得到当前的UCS矩阵，并传给Jig
   Matrix3d ucs = ed.CurrentUserCoordinateSystem;
   //创建Jig对象
   PlineJig jig = new PlineJig();
   bool bSuccess = true, bComplete = false;
   do  //通过循环来直接设置polyline的顶点
            {
    PromptResult res = ed.Drag(jig); //拖动
    //拖动成功后就添加得到的点
    bSuccess = (res.Status == PromptStatus.OK);
    if (bSuccess)
     jig.AddLatestVertex();
    //若没有输入了，表示拖动结束
    bComplete = (res.Status == PromptStatus.None);
    if (bComplete) //在添加polyline前，先清除最后一个点
     jig.RemoveLastVertex();
   } while (bSuccess && !bComplete);
   //若JIG成功完成，添加这个polyline
   if (bComplete) {
    Database db = doc.Database;
    Transaction tr = db.TransactionManager.StartTransaction();
    using (tr) {
     BlockTable bt = (BlockTable)tr.GetObject(db.BlockTableId,
    OpenMode.ForRead, false);
     BlockTableRecord btr = (BlockTableRecord)tr.GetObject(
            bt[BlockTableRecord.ModelSpace],
            OpenMode.ForWrite, false);
     btr.AppendEntity(jig.GetEntity());
     tr.AddNewlyCreatedDBObject(jig.GetEntity(), true);
     tr.Commit();
    }
   }
  }
 }
}
 
2.对实体集操作：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Autodesk.AutoCAD.Runtime;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.EditorInput;
using System.Collections.Specialized;
using Autodesk.AutoCAD.Geometry;
using DNA;
namespace ClassLibrary1
{
    public class LineJigrawJig
    {
        Point3d startPoint, endPoint;
        List<Line> lines = new List<Line>();
        int rows, cols;
        [CommandMethod("Test")]
        public void Test()
        {
            Editor ed = Application.DocumentManager.MdiActiveDocument.Editor;
            Database db = HostApplicationServices.WorkingDatabase;
            rows = ed.GetInteger("\n请输入网格行数:").Value;
            cols = ed.GetInteger("\n请输入网格列数:").Value;

            PromptPointResult pRes = ed.GetPoint("请选择第一点:");
            startPoint = pRes.Value;
            lines.Clear();
            for (int i = 1; i < rows; i++)
            {
                Line line = new Line(startPoint, startPoint);
                line.ColorIndex = 1;
                lines.Add(line);
            }
            for (int j = 1; j < cols; j++)
            {
                Line line = new Line(startPoint, startPoint);
                line.ColorIndex = 2;
                lines.Add(line);
            }
            if (pRes.Status == PromptStatus.OK)
            {
                PromptResult resJig = ed.Drag(this);
                if (resJig.Status == PromptStatus.OK)
                {
                    Tools.AddEntities(lines.ToArray());
                }
            }
        }
        protected override bool WorldDraw(Autodesk.AutoCAD.GraphicsInterface.WorldDraw draw)
        {
            foreach (Line line in lines)
            {
                draw.Geometry.Draw(line);
            }
            return true;
        }
        protected override SamplerStatus Sampler(JigPrompts prompts)
        {
            JigPromptPointOptions optJig = new JigPromptPointOptions("\n请指定第二点");
            PromptPointResult resJigDis = prompts.AcquirePoint(optJig);
            Point3d tempPt = resJigDis.Value;
            if (resJigDis.Status == PromptStatus.Cancel)
            {
                return SamplerStatus.Cancel;
            }
            if (endPoint != tempPt)
            {
                endPoint = tempPt;
                double xDist = (endPoint.X - startPoint.X) / cols;
                double yDist = (endPoint.Y - startPoint.Y) / rows;
                //画水平线
                for (int i = 1; i < rows; i++)
                {
                    Point3d pt1 = new Point3d(startPoint.X, startPoint.Y + yDist * i, 0);
                    Point3d pt2 = new Point3d(endPoint.X, startPoint.Y + yDist * i, 0);
                    lines[i].StartPoint = pt1;
                    lines[i].EndPoint = pt2;
                }
                //画竖直线
                for (int i = 1; i < cols; i++)
                {
                    Point3d pt1 = new Point3d(startPoint.X + xDist * i, startPoint.Y, 0);
                    Point3d pt2 = new Point3d(startPoint.X + xDist * i, endPoint.Y, 0);
                    lines[i + rows].StartPoint = pt1;
                    lines[i + rows].EndPoint = pt2;
                }
                return SamplerStatus.OK;
            }
            else
            {
                return SamplerStatus.NoChange;
            }
        }
    }
}