2025年ad20怎么设置捕捉（ad20怎么捕捉线的中心）

科技前沿 • 2025-04-16 18:21 • 阅读 43

大家好，我是讯享网，很高兴认识大家。

下面是一个使用C#语言编写的.NET平台上的CAD应用程序的代码示例，实现了自动捕捉端点功能：

using Autodesk.<em>AutoCAD</em>.Runtime; using Autodesk.<em>AutoCAD</em>.ApplicationServices; using Autodesk.<em>AutoCAD</em>.DatabaseServices; using Autodesk.<em>AutoCAD</em>.EditorInput; using Autodesk.<em>AutoCAD</em>.Geometry; namespace My<em>CAD</em>App { public class MyCommands { [CommandMethod(&quot;MyLine&quot;)] public void MyLine() { Document doc = Application.DocumentManager.MdiActiveDocument; Database db = doc.Database; Editor ed = doc.Editor; using (Transaction tr = db.TransactionManager.StartTransaction()) { BlockTable bt = (BlockTable)tr.GetObject(db.BlockTableId, OpenMode.ForRead); BlockTableRecord btr = (BlockTableRecord)tr.GetObject(bt[BlockTableRecord.ModelSpace], OpenMode.ForWrite); PromptPointOptions ppo1 = new PromptPointOptions(&quot; Start point: &quot;); ppo1.UseBasePoint = true; ppo1.BasePoint = Point3d.Origin; ppo1.UseDashedLine = true; ppo1.AllowNone = true; ppo1.Keywords.Add(&quot;E&quot;); ppo1.Keywords.Add(&quot;X&quot;); ppo1.Keywords.Default = &quot;E&quot;; PromptPointResult ppr1 = ed.GetPoint(ppo1); if (ppr1.Status != PromptStatus.OK) return; if (ppr1.Status == PromptStatus.Keyword) { if (ppr1.StringResult == &quot;X&quot;) return; else if (ppr1.StringResult == &quot;E&quot;) { ppo1.UseBasePoint = false; ppo1.UseDashedLine = false; ppo1.Message = &quot; Endpoint: &quot;; ppo1.Keywords.Clear(); } } PromptPointOptions ppo2 = new PromptPointOptions(&quot; End point: &quot;); ppo2.UseBasePoint = true; ppo2.BasePoint = ppr1.Value; ppo2.UseDashedLine = true; ppo2.AllowNone = true; ppo2.Keywords.Add(&quot;E&quot;); ppo2.Keywords.Add(&quot;X&quot;); ppo2.Keywords.Default = &quot;E&quot;; PromptPointResult ppr2 = ed.GetPoint(ppo2); if (ppr2.Status != PromptStatus.OK) return; if (ppr2.Status == PromptStatus.Keyword) { if (ppr2.StringResult == &quot;X&quot;) return; else if (ppr2.StringResult == &quot;E&quot;) { ppo2.UseBasePoint = false; ppo2.UseDashedLine = false; ppo2.Message = &quot; Endpoint: &quot;; ppo2.Keywords.Clear(); } } Line line = new Line(ppr1.Value, ppr2.Value); btr.AppendEntity(line); tr.AddNewlyCreatedDBObject(line, true); tr.Commit(); } } } }

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在这个代码示例中，使用了AutoCAD的API中的PromptPointOptions类的UseBasePoint属性和UseDashedLine属性来实现自动捕捉端点功能。在获取起点坐标时，设置UseBasePoint属性为true，并将BasePoint属性设置为原点，同时设置UseDashedLine属性为true，这样在鼠标移动过程中，会自动捕捉到距离原点最近的端点。在获取终点坐标时，设置UseBasePoint属性为true，并将BasePoint属性设置为起点坐标，同时设置UseDashedLine属性为true，这样在鼠标移动过程中，会自动捕捉到距离起点坐标最近的端点。通过使用PromptPointOptions类的Keywords属性，可以添加关键字，实现在命令过程中的交互。

2025年ad20怎么设置捕捉（ad20怎么捕捉线的中心）

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