C#根据dxf再控件上面绘制

在C#中，可以使用AutoCAD的COM组件或者开源的DXF解析库来读取和处理DXF文件，并使用.NET GDI+图形库在控件上面绘制。 以下是一个使用DXFSharp库读取和显示DXF文件的示例代码： ``` using System.Drawing; using System.Windows.Forms; using DXFSharp; class DXFViewer : Control { private DXFDocument dxf; public DXFViewer() { // 读取DXF文件 dxf = DXFDocument.Load("example.dxf"); } protected override void OnPaint(PaintEventArgs e) { base.OnPaint(e); Graphics g = e.Graphics; // 设置绘图参数 g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias; g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic; // 绘制实体 foreach (DXFEntity entity in dxf.Entities) { if (entity is DXFPolyline) { DXFPolyline polyline = (DXFPolyline) entity; PointF[] points = polyline.Vertices.Select(v => new PointF((float) v.X, (float) v.Y)).ToArray(); g.DrawLines(Pens.Black, points); } else if (entity is DXFCircle) { DXFCircle circle = (DXFCircle) entity; float x = (float) circle.Center.X - (float) circle.Radius; float y = (float) circle.Center.Y - (float) circle.Radius; float diameter = (float) circle.Radius * 2; g.DrawEllipse(Pens.Black, x, y, diameter, diameter); } else if (entity is DXFArc) { DXFArc arc = (DXFArc) entity; float x = (float) arc.Center.X - (float) arc.Radius; float y = (float) arc.Center.Y - (float) arc.Radius; float diameter = (float) arc.Radius * 2; float startAngle = (float) (arc.StartAngle / Math.PI * 180); float sweepAngle = (float) (arc.SweepAngle / Math.PI * 180); g.DrawArc(Pens.Black, x, y, diameter, diameter, startAngle, sweepAngle); } } } } ``` 以上代码演示了如何读取DXF文件并使用.NET GDI+图形库在控件上面绘制DXF文件中的实体。您可以根据需要进行修改和扩展。