cad二次 开发 修改块的颜色_C#之CAD二次开发(10) 用户交互之选择集

1. GetSelection() 用户在图形中选择实体
 
2. SelectAll()   选择所有实体
 
3. SelectCrossingWindow() 选择窗口及和窗口四边相交的实体
 
4. SelectCrossingPolygon 选择多边形中及和多边形相交的实体
 
5. SelectFence 栏选
 
6. SelectImplied 选择当前图形中已经选择的实体
 
7. SelectLast 选择图形中最后一盒绘制的实体
 
8. SelectPrevious 选择上一个选择集
 
9. SelectWindows 选择窗口中的实体
 
10. SelectWindowsPolygon 选择多边形中的实体
 
11. SelectCrossingWindow 通过点坐标选择图形

using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.EditorInput;
using Autodesk.AutoCAD.Geometry;
using Autodesk.AutoCAD.Runtime;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
 
namespace _05_选择集
{
    public class Class1
    {
        [CommandMethod("SeleDemo")]
        public void SeleDemo()
        {
            Database db = HostApplicationServices.WorkingDatabase;
            Editor ed = Application.DocumentManager.MdiActiveDocument.Editor;
            //PromptSelectionResult psr = ed.SelectAll(); // 选择窗口中所有图形
            // 只选择窗口中的圆形
            TypedValue[] values = new TypedValue[]
            {
                new TypedValue((int)DxfCode.Start,"Circle")
            };
            SelectionFilter filter = new SelectionFilter(values);// 过滤器
            //PromptSelectionResult psr = ed.GetSelection(filter); // 选取图形对象
            //if(psr.Status == PromptStatus.OK)
            //{
            //    SelectionSet sSet = psr.Value;
            //    this.ChangeColor(sSet);
 
            //}
 
            PromptSelectionResult psr = ed.GetSelection(filter);
            List<ObjectId> ids = new List<ObjectId>();
            if (psr.Status == PromptStatus.OK)
            {
                SelectionSet sSet = psr.Value;
                List<Point3d> points = new List<Point3d>();
                points = this.GetPoint(sSet);
                for (int i = 0; i < points.Count; i++)
                {
                    PromptSelectionResult ss1 = ed.SelectCrossingWindow(points.ElementAt(i), points.ElementAt(i));
                    ids.AddRange(ss1.Value.GetObjectIds());
                }
            }
            this.ChangeColor(ids);
        }
 
       
        private List<Point3d> GetPoint(SelectionSet sSet)
        {
            List<Point3d> points = new List<Point3d>();
            ObjectId[] ids = sSet.GetObjectIds();
            Database db = HostApplicationServices.WorkingDatabase;
            using (Transaction trans = db.TransactionManager.StartTransaction())
            {
                for (int i = 0; i < ids.Length; i++)
                {
                    Entity ent = (Entity)ids[i].GetObject(OpenMode.ForRead);
                    Point3d center = ((Circle)ent).Center;
                    double radius = ((Circle)ent).Radius;
                    points.Add(new Point3d(center.X + radius, center.Y, center.Z));
                }
                trans.Commit();
            }
            return points;
        }
                
 
        /// <summary>
        /// 改变颜色
        /// </summary>
        /// <param name="sSet">选取对象</param>
        private void ChangeColor(SelectionSet sSet)
        {
            ObjectId[] ids = sSet.GetObjectIds();
            Database db = HostApplicationServices.WorkingDatabase;
            using (Transaction trans = db.TransactionManager.StartTransaction())
            {
                for (int i = 0; i < ids.Length; i++)
                {
                    Entity ent = (Entity)ids[i].GetObject(OpenMode.ForWrite);
                    ent.ColorIndex = 1; // 红色
                }
                trans.Commit();
            }
        }
 
        private void ChangeColor(List<ObjectId> ids)
        {
            
            Database db = HostApplicationServices.WorkingDatabase;
            using (Transaction trans = db.TransactionManager.StartTransaction())
            {
                for (int i = 0; i < ids.Count; i++)
                {
                    Entity ent = (Entity)ids[i].GetObject(OpenMode.ForWrite);
                    ent.ColorIndex = 3; // 红色
                }
                trans.Commit();
            }
        }
    }
}