AutoCAD二次开发&模拟步骤、选择与直线最近点

最新推荐文章于 2025-06-06 22:57:31 发布

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本文介绍了一种在AutoCAD中进行二次开发的方法，通过模拟鼠标操作更新块图形位置。代码示例展示了如何将块图形更新到与鼠标最近的点，并涉及数据库图形空间的更新。该方法适用于希望在AutoCAD环境中进行定制开发的用户。

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这个是关于AutoCAD二次开发模拟步骤效果，将块图形更新到与鼠标最为接近的点。注意该代码中已经将创建线段的两个点坐标已经写死了，大家可以尝试着写入动态的点，即鼠标选择的点，然后将图形更新到数据库图形空间中。这里涉及到块的名字预先是固定了的，如果是换成其他名字，那么，对于该程序将是行不通的，当然也可以按照需要输入块的名字，然后选择图形。

实现代码如下：

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;

namespace JigBetweenTwoPoint
{
    public class Class1
    {
        [CommandMethod("TEST")]
        public static void Test() {
            Document doc = Application.DocumentManager.MdiActiveDocument;
            Database db = doc.Database;
            Editor ed = doc.Editor;

            using (Transaction trans = db.TransactionManager.StartTransaction())
            {

                BlockTable bt = (BlockTable)trans.GetObject(db.BlockTableId, OpenMode.ForRead);
                if (!bt.Has("chkj"))
                {
                    return;
                }
                using (BlockReference br = new BlockReference(Point3d.Origin, bt["chkj"]))
                {
                     br.TransformBy(ed.CurrentUserCoordinateSystem);
                     var jig = new BlockJig(br, Point3d.Origin, new Point3d(10.0, 0.0, 0.0));

                     var pr = ed.Drag(jig);
                     if (pr.Status == PromptStatus.OK)
                     {
                         var curSpace = (BlockTableRecord)trans.GetObject(db.CurrentSpaceId, OpenMode.ForWrite);
                         curSpace.AppendEntity(br);
                         trans.AddNewlyCreatedDBObject(br, true);
                     }
                }


                trans.Commit();
            }
        
        }
    }

    class BlockJig : EntityJig
    {
        BlockReference br;
        LineSegment3d line;
        Point3d dragPt;


        public BlockJig(BlockReference br, Point3d pt1, Point3d pt2)
            : base(br)
        {
            this.br = br;
            line = new LineSegment3d(pt1, pt2);
        }

        protected override SamplerStatus Sampler(JigPrompts prompts)
        {
            JigPromptPointOptions options = new JigPromptPointOptions("\nInsertion point: ");
            options.UserInputControls =
                    UserInputControls.Accept3dCoordinates |
                    UserInputControls.UseBasePointElevation;
            var result = prompts.AcquirePoint(options);

            if (result.Value.IsEqualTo(dragPt))
            {
                 return SamplerStatus.NoChange;
            }

            dragPt = result.Value;
            return SamplerStatus.OK;
        }
        protected override bool Update()
        {
            br.Position = line.GetClosestPointTo(dragPt).Point;
            return true;
        }
    }
}