1.下载安装netDxf库
2.读取dxf文件，数据存储到DataTable
using netDxf;
using netDxf.Entities;
/// <summary>/// 读取CAD的Dxf文件数据/// </summary>public class DxfHelperHtility{/// <summary>/// 读取CAD文件数据/// </summary>/// <param name="fileName"></param>/// <returns></returns>public static DataTable ReadDxf(string fileName){DataTable dt = CreatDataTable();try{// 加载DXF文件DxfDocument dxf = DxfDocument.Load(fileName);netDxf.Tables.UCS ucs =dxf.DrawingVariables.CurrentUCS;netDxf.Collections.ImageDefinitions dd =dxf.ImageDefinitions;bool bRow = false;// 遍历所有实体foreach (EntityObject entity in dxf.Entities.All){bRow = false;//添加数据行DataRow drRow = dt.NewRow();switch (entity){case Line line://直线drRow["DrawingType"] = 0;drRow["StartPointX"] = ToConver(line.StartPoint.X, ucs.Origin.X);drRow["StartPointY"] = ToConver(line.StartPoint.Y, ucs.Origin.Y);drRow["EndPointX"] = ToConver(line.EndPoint.X, ucs.Origin.X);drRow["EndPointY"] = ToConver(line.EndPoint.Y, ucs.Origin.Y);drRow["Thickness"] = line.Thickness;bRow = true;break;case Circle circle://圆形drRow["DrawingType"] = 1;drRow["StartPointX"] = ToConver(circle.Center.X, ucs.Origin.X);drRow["StartPointY"] = ToConver(circle.Center.Y, ucs.Origin.Y);drRow["Radius"] = circle.Radius;drRow["Thickness"] = circle.Thickness;bRow = true;break;case Arc arc://弧形drRow["DrawingType"] = 2;drRow["StartPointX"] = ToConver(arc.Center.X, ucs.Origin.X);drRow["StartPointY"] = ToConver(arc.Center.Y, ucs.Origin.Y);drRow["Radius"] = arc.Radius;drRow["StartAngle"] = arc.StartAngle;drRow["EndAngle"] = arc.EndAngle;drRow["Thickness"] = arc.Thickness;bRow = true;break;case Text text://文本break;case Ellipse ellipse://椭圆drRow["DrawingType"] = 4;drRow["StartPointX"] = ToConver(ellipse.Center.X, ucs.Origin.X);drRow["StartPointY"] = ToConver(ellipse.Center.Y, ucs.Origin.Y);drRow["MajorAxis"] = ellipse.MajorAxis;drRow["MinorAxis"] = ellipse.MinorAxis;drRow["StartAngle"] = ellipse.StartAngle;drRow["EndAngle"] = ellipse.EndAngle;drRow["Thickness"] = ellipse.Thickness;bRow = true;break;case Polyline2D polyline2D:drRow["DrawingType"] = 5;drRow["Thickness"] = polyline2D.Thickness;string data = "";Polyline2DVertex startVertex = polyline2D.Vertexes[0];Polyline2DVertex nextVertex;double radius = 0;for (int i = 0; i < polyline2D.Vertexes.Count; i++){radius = 0;Polyline2DVertex curVertex = polyline2D.Vertexes[i];if (curVertex.Bulge != 0){//有凸度，计算半径if (i == polyline2D.Vertexes.Count){nextVertex = startVertex;}else{nextVertex = polyline2D.Vertexes[i + 1];}radius = CalBulgeRadius(curVertex.Position.X, curVertex.Position.Y, nextVertex.Position.X, nextVertex.Position.Y, curVertex.Bulge);}data += string.Format("X:{0},Y:{1},Bulge:{2},StartWidth:{3},EndWidth:{4},Radius:{5}|", ToConver(curVertex.Position.X, ucs.Origin.X), ToConver(curVertex.Position.Y, ucs.Origin.Y), curVertex.Bulge, curVertex.StartWidth, curVertex.EndWidth, radius);}drRow["Data"] = data;bRow = true;break;default:break;}if (bRow){dt.Rows.Add(drRow);}}}catch (Exception ex){}return dt;}/// <summary>/// 坐标转换/// </summary>/// <param name="value">坐标值</param>/// <param name="ucs">用户原点坐标</param>/// <returns></returns>private static int ToConver(double value,double ucs){int result = 0;result = (int)Math.Round(value- ucs);return result;}/// <summary>/// 动态创建表格列/// </summary>/// <returns></returns>private static DataTable CreatDataTable(){DataTable dt = new DataTable();try{//添加列dt.Columns.Add("DrawingType", typeof(int));//类型dt.Columns.Add("StartPointX", typeof(double));//起点X坐标dt.Columns.Add("StartPointY", typeof(double));//起点Y坐标dt.Columns.Add("EndPointX", typeof(double));//终点X坐标dt.Columns.Add("EndPointY", typeof(double));//起点Y坐标dt.Columns.Add("Radius", typeof(double));//圆半径dt.Columns.Add("StartAngle", typeof(double));//起点角度dt.Columns.Add("EndAngle", typeof(double));//终点角度dt.Columns.Add("MajorAxis", typeof(double));//椭圆长轴dt.Columns.Add("MinorAxis", typeof(double));//椭圆短轴dt.Columns.Add("Thickness", typeof(double));//线宽dt.Columns.Add("Data", typeof(string));//线宽}catch (Exception ex){}return dt;}/// <summary>/// 根据两点和凸度，计算半径/// </summary>/// <param name="x1"></param>/// <param name="y1"></param>/// <param name="x2"></param>/// <param name="y2"></param>/// <param name="bulge"></param>/// <returns></returns>public static double CalBulgeRadius(double x1, double y1, double x2, double y2, double bulge){double radius = 0;try{if (bulge == 0)return radius;//计算顶点角度double cicleAngle = Math.Atan(bulge) * 4;//两点之间的距离double pointLen = Math.Sqrt((x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2));//根据正玄值反推radius = (pointLen / 2) / Math.Sin(cicleAngle / 2);return Math.Abs(radius);}catch (Exception ex){}return radius;}}
特别注意：如果用户画的图不是默认原点，而是自定义原点，需要获取用户坐标原点，其他线段点需要减去用户坐标原点才能得到正确的坐标
//获取用户坐标系（UCS）的原点坐标netDxf.Tables.UCS ucs =dxf.DrawingVariables.CurrentUCS;
至此完成了dxf文件读取并将数据存储到DataTable，供后续处理。
3.DataTable数据转换成通用数据，供上层使用
/// <summary>/// 读取CAD文件数据/// </summary>/// <param name="path"></param>/// <returns></returns>public static List<DxfModel> ReadDxf(string path){List<DxfModel> list = new List<DxfModel>();DataTable dt = DxfHelperHtility.ReadDxf(path);if (dt == null || dt.Rows.Count <= 0){return list;}for (int i = 0; i < dt.Rows.Count; i++){DxfModel dxfModel = new DxfModel();int drawingType = Convert.ToInt16(dt.Rows[i]["DrawingType"].ToString().Trim());switch (drawingType){case 0://直线dxfModel.DrawingType = drawingType;dxfModel.StartPointX= Convert.ToInt16(dt.Rows[i]["StartPointX"].ToString().Trim());dxfModel.StartPointY = Convert.ToInt16(dt.Rows[i]["StartPointY"].ToString().Trim());dxfModel.EndPointX = Convert.ToInt16(dt.Rows[i]["EndPointX"].ToString().Trim());dxfModel.EndPointY = Convert.ToInt16(dt.Rows[i]["EndPointY"].ToString().Trim());dxfModel.Thickness = Convert.ToDouble(dt.Rows[i]["Thickness"].ToString().Trim());list.Add(dxfModel);break;case 1://圆形dxfModel.DrawingType = drawingType;dxfModel.StartPointX = Convert.ToInt16(dt.Rows[i]["StartPointX"].ToString().Trim());dxfModel.StartPointY = Convert.ToInt16(dt.Rows[i]["StartPointY"].ToString().Trim());dxfModel.Radius = Convert.ToDouble(dt.Rows[i]["Radius"].ToString().Trim());dxfModel.Thickness = Convert.ToDouble(dt.Rows[i]["Thickness"].ToString().Trim());list.Add(dxfModel);break;case 2://圆弧dxfModel.DrawingType = drawingType;dxfModel.StartPointX = Convert.ToInt16(dt.Rows[i]["StartPointX"].ToString().Trim());dxfModel.StartPointY = Convert.ToInt16(dt.Rows[i]["StartPointY"].ToString().Trim());dxfModel.Radius = Convert.ToDouble(dt.Rows[i]["Radius"].ToString().Trim());dxfModel.StartAngle = Convert.ToDouble(dt.Rows[i]["StartAngle"].ToString().Trim());dxfModel.EndAngle = Convert.ToDouble(dt.Rows[i]["EndAngle"].ToString().Trim());dxfModel.Thickness = Convert.ToDouble(dt.Rows[i]["Thickness"].ToString().Trim());list.Add(dxfModel);break;case 3://文本break;case 4://椭圆dxfModel.DrawingType = drawingType;dxfModel.StartPointX = Convert.ToInt16(dt.Rows[i]["StartPointX"].ToString().Trim());dxfModel.StartPointY = Convert.ToInt16(dt.Rows[i]["StartPointY"].ToString().Trim());dxfModel.MajorAxis = Convert.ToDouble(dt.Rows[i]["MajorAxis"].ToString().Trim());dxfModel.MinorAxis = Convert.ToDouble(dt.Rows[i]["MinorAxis"].ToString().Trim());dxfModel.StartAngle = Convert.ToDouble(dt.Rows[i]["StartAngle"].ToString().Trim());dxfModel.EndAngle = Convert.ToDouble(dt.Rows[i]["EndAngle"].ToString().Trim());dxfModel.Thickness = Convert.ToDouble(dt.Rows[i]["Thickness"].ToString().Trim());list.Add(dxfModel);break;case 5://Polyline2DdxfModel.DrawingType = drawingType;dxfModel.Thickness = Convert.ToDouble(dt.Rows[i]["Thickness"].ToString().Trim());//解析图形坐标string[] datas = dt.Rows[i]["Data"].ToString().Trim().Split('|');for (int k = 0; k < datas.Count() - 1; k++){Polyline polyline = new Polyline();string[] messageData = datas[k].Split(',');polyline.X = Convert.ToDouble(messageData[0].Split(':')[1]);polyline.Y = Convert.ToDouble(messageData[1].Split(':')[1]);polyline.Bulge = Convert.ToDouble(messageData[2].Split(':')[1]);polyline.StartWidth = Convert.ToDouble(messageData[3].Split(':')[1]);polyline.EndWidth = Convert.ToDouble(messageData[4].Split(':')[1]);polyline.Radius = Convert.ToDouble(messageData[5].Split(':')[1]);dxfModel.Polylines.Add(polyline);}list.Add(dxfModel);break;default:break;}}return list;}
4.基于Canvas画图
/// <summary>/// 画图/// </summary>private void Draw(){try{if (string.IsNullOrWhiteSpace(DxfName)){return;}Path path = new Path();PathGeometry pathGeometry = new PathGeometry();PathFigure pathFigure = new PathFigure();Point startPoint = new Point();Point endPoint = new Point();Point prePoint = startPoint;List<DxfModel> list =FileManageBll.ReadDxf(DxfName);foreach (var item in list){switch (item.DrawingType){case 0://直线// 创建Path对象path = new Path();path.Stroke = System.Windows.Media.Brushes.White;path.StrokeThickness = 1;// 创建PathGeometry对象pathGeometry = new PathGeometry();// 创建PathFigure对象pathFigure = new PathFigure();pathFigure.StartPoint = new System.Windows.Point(item.StartPointX, -item.StartPointY);// 创建LineSegment对象并添加到PathFigurepathFigure.Segments.Add(new LineSegment(new System.Windows.Point(item.EndPointX, -item.EndPointY), true));// 将PathFigure添加到PathGeometrypathGeometry.Figures.Add(pathFigure);// 设置Path的Data属性为PathGeometry对象path.Data = pathGeometry;// 将path添加到myCanvas1中this.mainWindow.myCanvas.Children.Add(path);break;case 1://圆System.Windows.Shapes.Ellipse ellipse = new System.Windows.Shapes.Ellipse{Width = item.Radius,Height = item.Radius,StrokeThickness = 1,Stroke = System.Windows.Media.Brushes.White};Canvas.SetLeft(ellipse, item.StartPointX);Canvas.SetTop(ellipse, -item.StartPointY);this.mainWindow.myCanvas.Children.Add(ellipse);break;case 2: //圆弧// 将角度转换为弧度double startRadians = item.StartAngle * Math.PI / 180;double endRadians = item.EndAngle * Math.PI / 180;// 计算起点和终点的坐标（注意Y轴方向）startPoint = new Point(item.StartPointX + item.Radius * Math.Cos(startRadians),-item.StartPointY - item.Radius * Math.Sin(startRadians));endPoint = new Point(item.StartPointX + item.Radius * Math.Cos(endRadians),-item.StartPointY - item.Radius * Math.Sin(endRadians));bool IsLargeArc = false;if ((item.EndAngle - item.StartAngle + 360) % 360 >= 180){//大弧IsLargeArc = true;}SweepDirection direction = SweepDirection.Counterclockwise;//if (item.StartAngle > item.EndAngle)//{// //逆时针// direction = SweepDirection.Clockwise;//}path = new Path();pathGeometry = new PathGeometry();ArcSegment arc = new ArcSegment(endPoint, new Size(item.Radius, item.Radius), 0, IsLargeArc, direction, true);PathFigure figure = new PathFigure();figure.StartPoint = startPoint;figure.Segments.Add(arc);pathGeometry.Figures.Add(figure);path.Data = pathGeometry;path.Stroke = Brushes.White;path.StrokeThickness = 1;this.mainWindow.myCanvas.Children.Add(path);break;case 3:break;case 4:break;case 5://Polyline2DstartPoint = new Point(Convert.ToInt32(item.Polylines[0].X), -Convert.ToInt32(item.Polylines[0].Y));double Bulge = item.Polylines[0].Bulge;pathGeometry = new PathGeometry();pathFigure = new PathFigure();pathFigure.StartPoint = startPoint;endPoint = new Point();prePoint = startPoint;double radius = item.Polylines[0].Radius;PathSegment segment;//循环各点连接成图形for (int i = 1; i < item.Polylines.Count; i++){endPoint = new Point(Convert.ToInt32(item.Polylines[i].X), -Convert.ToInt32(item.Polylines[i].Y));segment = GetSegment(endPoint, Bulge, radius);pathFigure.Segments.Add(segment);radius = item.Polylines[i].Radius;Bulge = item.Polylines[i].Bulge;prePoint = endPoint;}//最后坐标连接首个坐标，完成闭合segment = GetSegment(startPoint, Bulge, radius);pathFigure.Segments.Add(segment);pathGeometry.Figures.Add(pathFigure);path = new Path{Stroke = Brushes.White,StrokeThickness = 1,Data = pathGeometry};this.mainWindow.myCanvas.Children.Add(path);break;default:break;}}}catch (Exception ex){}}/// <summary>/// 获取Segment/// </summary>/// <param name="messageData"></param>/// <param name="StartPoint"></param>/// <param name="Bulge"></param>/// <returns></returns>private PathSegment GetSegment(Point point, double Bulge,double radius){PathSegment pathSegment = null;try{if (Bulge == 0){pathSegment = new LineSegment(point, true);}else{bool IsLargeArc = false;SweepDirection sweepDirection = SweepDirection.Counterclockwise;sweepDirection = SweepDirection.Counterclockwise;//大于1优弧IsLargeArc = Math.Abs(Bulge) > 1;if (Bulge < 0){//小于0顺时针sweepDirection = SweepDirection.Clockwise;}pathSegment = new ArcSegment(point, new Size(radius, radius), 0, IsLargeArc, sweepDirection, true);}}catch (Exception ex){}return pathSegment;}
效果如图所示：
