介绍

开源库ACadSharp的地址：https://github.com/DomCR/ACadSharp

可以在NuGet中搜索到该库并安装。

数据示例

数据是一个绘制了以下简单图元的dwg数据：

读取图元属性

创建了.net6控制台项目，通过NuGet安装了ACadSharp库。

测试了以下几种图元的读取：

• Line
• Arc
• Circle
• Ellipse
• LwPolyline
• MText
• Text

using ACadSharp.IO;
using ACadSharp;
using ACadSharp.Entities;

namespace TestACadSharp
{
    internal class Program
    {
        static void Main(string[] args)
        {
            var dwgPath = "./test-data/demo.dwg";
            CadDocument doc = DwgReader.Read(dwgPath, onNotification);

            //遍历所有实体
            foreach (var entity in doc.Entities)
            {
                PrintInfo(entity);
                Console.WriteLine();
            }
            Console.WriteLine("Over!");
        }

        static void PrintInfo(Entity ent)
        {
            switch (ent)
            {
                case Line:
                    var e = ent as Line;
                    Console.WriteLine($"Line: X1={e.StartPoint.X},Y1={e.StartPoint.Y}," +
                        $"X2={e.EndPoint.X},Y2={e.EndPoint.Y},Handle={e.Handle}");
                    break;
                case Arc:
                    var a = ent as Arc;
                    Console.WriteLine($"Arc: r={a.Radius},X={a.Center.X},Y={a.Center.Y}," +
                        $"StartAngle={a.StartAngle},EndAngle={a.EndAngle}");
                    break;
                case Circle:
                    var c = ent as Circle;
                    Console.WriteLine($"Circle: r={c.Radius},X={c.Center.X},Y={c.Center.Y}");
                    break;
                case Ellipse:
                    var ee = ent as Ellipse;
                    Console.WriteLine($"Ellipse: X={ee.Center.X},Y={ee.Center.Y}," +
                        $"MajorAxis={ee.MajorAxis},MinorAxis={ee.MinorAxis}," +
                        $"Rotation={ee.Rotation}");
                    break;
                case Polyline:
                    var p = ent as Polyline;
                    Console.WriteLine($"Polyline: IsClosed={p.IsClosed}");
                    for (int i = 0; i < p.Vertices.Count; i++)
                    {
                        var v = p.Vertices[i];
                        Console.WriteLine($"Bulge={v.Bulge},X={v.Location.X},Y={v.Location.Y}");
                    }
                    break;
                case LwPolyline:
                    var wp = ent as LwPolyline;
                    Console.WriteLine($"LwPolyline: IsClosed={wp.IsClosed}");
                    for (int i = 0; i < wp.Vertices.Count; i++)
                    {
                        var v = wp.Vertices[i];
                        Console.WriteLine($"Bulge={v.Bulge},X={v.Location.X},Y={v.Location.Y}");
                    }
                    break;
                case MText:
                    var mt = ent as MText;
                    Console.WriteLine($"MText: X={mt.InsertPoint.X},Y={mt.InsertPoint.Y},Text={mt.Value},Height={mt.Height}");
                    break;
                case TextEntity:
                    var t = ent as TextEntity;
                    Console.WriteLine($"Text: X={t.InsertPoint.X},Y={t.InsertPoint.Y},Text={t.Value},Height={t.Height}");
                    break;
                default:
                    break;
            }
        }


        // Process a notification form the reader
        private static void onNotification(object sender, NotificationEventArgs e)
        {
            Console.WriteLine(e.Message);
        }
    }
}

在控制台打印了图元的部分属性：

Line: X1=0,Y1=0,X2=100,Y2=100,Handle=591

Circle: r=20,X=100,Y=100

LwPolyline: IsClosed=False
Bulge=0,X=100,Y=0
Bulge=0,X=200,Y=100
Bulge=0,X=200,Y=200

Arc: r=50,X=200,Y=0,StartAngle=1.5707963267948961,EndAngle=3.5853960407017067

LwPolyline: IsClosed=True
Bulge=0,X=0,Y=200
Bulge=0,X=20,Y=200
Bulge=0,X=100,Y=300
Bulge=0,X=20,Y=300

LwPolyline: IsClosed=False
Bulge=1.7160122950374628,X=144.12226845286386,Y=251.44355233800798
Bulge=0,X=203.49903695426838,Y=270.9970954309483
Bulge=0,X=168.5715230805963,Y=344.3228820294762
Bulge=0,X=91.0324529571044,Y=367.36812645092596

Ellipse: X=325.5331742656035,Y=139.27755185746537,MajorAxis=167.47948810551864,MinorAxis=61.59293601510967,Rotation=-2.3304093705041717

Text: X=334.465413122849,Y=340.1926829662716,Text=hello,Height=77.01746524013924

MText: X=427.1373896780551,Y=226.34077414221065,Text=world\P!!!!,Height=77.01746524013924