DWG 绘图

导出 DWG 绘图到 PDF

Aspose.CAD for .NET API 可以加载 AutoCAD 绘图，格式为 DWG，并将其转换为 PDF。本主题讲解了如何通过以下简单步骤使用 Aspose.CAD API 实现 DWG 转 PDF 的转换。

该 API 支持以下 AutoCAD DWG 版本：

• DWG 2004 版本 16.0 发布 18
• DWG 2005 版本 16.1
• DWG 2010 版本 18.0
• DWG 2013 版本 19.0

DWG 文件格式

DWG 是一种包含矢量图像数据和元数据的二进制文件。矢量图像数据提供了有关如何显示 DWG 的 CAD 应用程序的指令；元数据可能包含有关文件的各种信息，包括特定位置的数据以及客户数据。有关 DWG 文件格式的开放规范可以在 此 PDF 中找到。

将 DWG 文件转换为 PDF

将 DWG 转换为 PDF 需遵循以下简单步骤。

1. 将 DWG 文件加载到 Image 的实例中。
2. 创建一个 CadRasterizationOptions 类的对象，并设置 PageHeight 和 PageWidth 属性。
3. 创建一个 PdfOptions 类的对象，并设置其 VectorRasterizationOptions 属性。
4. 调用 Image.Save 方法，并将 PdfOptions 的对象作为第二个参数传递。

下面的代码示例展示了如何将 DWG 绘图导出为 PDF。

// The path to the documents directory.
string MyDir = RunExamples.GetDataDir_DWGDrawings();
string sourceFilePath = MyDir + "Bottom_plate.dwg";
using (Aspose.CAD.Image image = Aspose.CAD.Image.Load(sourceFilePath))
{
    // Create an instance of CadRasterizationOptions and set its various properties
    Aspose.CAD.ImageOptions.CadRasterizationOptions rasterizationOptions = new Aspose.CAD.ImageOptions.CadRasterizationOptions();
    rasterizationOptions.BackgroundColor = Aspose.CAD.Color.White;
    rasterizationOptions.PageWidth = 1600;
    rasterizationOptions.PageHeight = 1600;

    // Create an instance of PdfOptions
    Aspose.CAD.ImageOptions.PdfOptions pdfOptions = new Aspose.CAD.ImageOptions.PdfOptions();
    // Set the VectorRasterizationOptions property
    pdfOptions.VectorRasterizationOptions = rasterizationOptions;

    MyDir = MyDir + "Bottom_plate_out.pdf";
    //Export the DWG to PDF
    image.Save(MyDir, pdfOptions);                
}

使用不同布局尺寸创建单个 PDF

Aspose.CAD for .NET 允许您将 DWG 文件转换为具有不同布局尺寸的单个 PDF。此方法的工作流程如下：

1. 使用 Aspose.CAD.Image.Load 工厂方法加载 DWG 文件。
2. 创建 CadRasterizationOptions 类的实例，并设置结果页面的高度和宽度。
3. 为 CadRasterizationOptions 对象添加所需的 LayoutPageSizes。
4. 创建 PdfOptions 类的实例，并设置其 VectorRasterizationOptions 属性。
5. 使用 Image.Save() 方法将图像导出为 PDF。

下面的代码示例展示了如何创建一个具有不同布局的单个 PDF。

            // The path to the documents directory.
            string MyDir = RunExamples.GetDataDir_DWGDrawings();


            using (CadImage cadImage = (CadImage)Image.Load(MyDir + "City skyway map.dwg"))
            {
                CadRasterizationOptions rasterizationOptions = new CadRasterizationOptions();
                rasterizationOptions.PageWidth = 1000;
                rasterizationOptions.PageHeight = 1000;

                //custom sizes for several layouts
                rasterizationOptions.LayoutPageSizes.Add("ANSI C Plot", new SizeF(500, 1000));
                rasterizationOptions.LayoutPageSizes.Add("8.5 x 11 Plot", new SizeF(1000, 100));

                PdfOptions pdfOptions = new PdfOptions() { VectorRasterizationOptions = rasterizationOptions };

                cadImage.Save(MyDir + "singlePDF_out.pdf", pdfOptions);

            }

支持的 AutoCAD 基元

支持以下 AutoCAD 基元。

• TEXT
• MTEXT
• ATTDEF
• ATTRIB
• ARC
• ELLIPSE
• HATCH
• LEADER
• POINT
• VERTEX 2D
• VERTEX 3D
• POLYLINE 2D
• LWPOLYLINE
• RAY
• CIRCLE
• DIMENSION ORDINATE
• DIMENSION LINEAR
• DIMENSION ALIGNED
• DIMENSION ANG 3Pt
• DIMENSION ANG 2Ln
• DIMENSION RADIUS
• DIMENSION DIAMETER
• SHAPE
• SOLID
• SPLINE
• MLINE
• LINE
• XLINE
• STYLE
• DIMSTYLE
• LTYPE
• MLINESTYLE
• LAYER
• VIEWPORT
• LAYOUT

将特定 DWG 布局导出为 PDF

此方法的工作流程如下：

1. 使用 Aspose.CAD.Image.Load 工厂方法加载 DWG 文件。
2. 创建 CadRasterizationOptions 类的实例，并设置结果页面的高度和宽度。
3. 为 CadRasterizationOptions 对象设置 Layouts 属性。
4. 创建 PdfOptions 类的实例，并设置其 VectorRasterizationOptions 属性。
5. 使用 Image.Save() 方法将图像导出为 PDF。

下面的代码示例展示了如何将 DWG 的特定布局转换为 PDF。

// The path to the documents directory.
string MyDir = RunExamples.GetDataDir_DWGDrawings();
string sourceFilePath = MyDir + "visualization_-_conference_room.dwg";
using (Aspose.CAD.Image image = Aspose.CAD.Image.Load(sourceFilePath))
{
    // Create an instance of CadRasterizationOptions and set its various properties
    Aspose.CAD.ImageOptions.CadRasterizationOptions rasterizationOptions = new Aspose.CAD.ImageOptions.CadRasterizationOptions();
    rasterizationOptions.PageWidth = 1600;
    rasterizationOptions.PageHeight = 1600;
    // Specify desired layout name
    rasterizationOptions.Layouts = new string[] { "Layout1" };

    // Create an instance of PdfOptions
    Aspose.CAD.ImageOptions.PdfOptions pdfOptions = new Aspose.CAD.ImageOptions.PdfOptions();
    // Set the VectorRasterizationOptions property
    pdfOptions.VectorRasterizationOptions = rasterizationOptions;

    MyDir = MyDir + "ExportSpecificLayoutToPDF_out.pdf";
    //Export the DWG to PDF
    image.Save(MyDir, pdfOptions);                
}

通过指定坐标渲染 DWG 文档

Aspose.CAD for .NET API 现在提供了一种功能，通过指定文档的宽度和高度坐标来渲染 DWG 文档。

下面的代码示例展示了如何渲染 DWG 文档。

// The path to the documents directory.
string MyDir = RunExamples.GetDataDir_DWGDrawings();
string sourceFilePath = MyDir + "Bottom_plate.dwg";
using (CadImage cadImage = (CadImage)Image.Load(sourceFilePath))
{
    CadRasterizationOptions rasterizationOptions = new CadRasterizationOptions();
    rasterizationOptions.Layouts = new string[] { "Model" };
    rasterizationOptions.NoScaling = true;

    // note: preserving some empty borders around part of image is the responsibility of customer
    // top left point of region to draw
    Point topLeft = new Point(6156, 7053);
    double width = 3108;
    double height = 2489;

    CadVportTableObject newView = new CadVportTableObject();

    // note: exactly such table name is required for active view
    newView.Name.Value = "*Active";
    newView.CenterPoint.X = topLeft.X + width / 2f;
    newView.CenterPoint.Y = topLeft.Y - height / 2f;
    newView.ViewHeight.Value = height;
    newView.ViewAspectRatio.Value = width / height;

    // search for active viewport and replace it
    for (int i = 0; i < cadImage.ViewPorts.Count; i++)
    {
        CadVportTableObject currentView = (CadVportTableObject)(cadImage.ViewPorts[i]);
        if ((currentView.Name.Value == null && cadImage.ViewPorts.Count == 1) ||
        string.Equals(currentView.Name.Value.ToLowerInvariant(), "*active"))
        {
            cadImage.ViewPorts[i] = newView;
            break;
        }
    }
    PdfOptions pdfOptions = new PdfOptions();
    rasterizationOptions.Layouts = new string[] { "Model" };
    pdfOptions.VectorRasterizationOptions = rasterizationOptions;

    cadImage.Save(MyDir, pdfOptions);                
}

使用固定尺寸导出 DWG 到光栅或 PDF

Aspose.CAD for .NET API 可以加载 DWG 格式的 AutoCAD 绘图，并使用固定尺寸将其转换为 PDF 或光栅。

下面的代码示例展示了如何实现此功能。

// The path to the documents directory.
string MyDir = RunExamples.GetDataDir_DWGDrawings();
string sourceFilePath = MyDir + "Bottom_plate.dwg";
string outPath = MyDir + "Bottom_plate.pdf";

using (CadImage cadImage = (CadImage)Image.Load(sourceFilePath))
{

    // export to pdf
    CadRasterizationOptions rasterizationOptions = new CadRasterizationOptions();
    rasterizationOptions.Layouts = new string[] { "Model" };

    bool currentUnitIsMetric = false;
    double currentUnitCoefficient = 1.0;
    DefineUnitSystem(cadImage.UnitType, out currentUnitIsMetric, out currentUnitCoefficient);

    if (currentUnitIsMetric)
    {
        double metersCoeff = 1 / 1000.0;

        double scaleFactor = metersCoeff / currentUnitCoefficient;

        rasterizationOptions.PageWidth = (float)(210 * scaleFactor);
        rasterizationOptions.PageHeight = (float)(297 * scaleFactor);
        rasterizationOptions.UnitType = UnitType.Millimeter;
    }
    else
    {
        rasterizationOptions.PageWidth = (float)(8.27f / currentUnitCoefficient);
        rasterizationOptions.PageHeight = (float)(11.69f / currentUnitCoefficient);
        rasterizationOptions.UnitType = UnitType.Inch;
    }

    rasterizationOptions.AutomaticLayoutsScaling = true;

    PdfOptions pdfOptions = new PdfOptions
    {
        VectorRasterizationOptions = rasterizationOptions
    };

    cadImage.Save(outPath, pdfOptions);

    // export to raster
    //A4 size at 300 DPI - 2480 x 3508   
    rasterizationOptions.PageHeight = 3508;
    rasterizationOptions.PageWidth = 2480;

    PngOptions pngOptions = new PngOptions
    {
        VectorRasterizationOptions = rasterizationOptions
    };
    cadImage.Save(outPath.Replace("pdf", "png"), pngOptions);

}
        }
private static void DefineUnitSystem(UnitType unitType, out bool isMetric, out double coefficient)
        {
isMetric = false;
coefficient = 1.0;

switch (unitType)
{
    case UnitType.Parsec:
        coefficient = 3.0857 * 10000000000000000.0;
        isMetric = true;
        break;
    case UnitType.LightYear:
        coefficient = 9.4607 * 1000000000000000.0;
        isMetric = true;
        break;
    case UnitType.AstronomicalUnit:
        coefficient = 1.4960 * 100000000000.0;
        isMetric = true;
        break;
    case UnitType.Gigameter:
        coefficient = 1000000000.0;
        isMetric = true;
        break;
    case UnitType.Kilometer:
        coefficient = 1000.0;
        isMetric = true;
        break;
    case UnitType.Decameter:
        isMetric = true;
        coefficient = 10.0;
        break;
    case UnitType.Hectometer:
        isMetric = true;
        coefficient = 100.0;
        break;
    case UnitType.Meter:
        isMetric = true;
        coefficient = 1.0;
        break;
    case UnitType.Centimenter:
        isMetric = true;
        coefficient = 0.01;
        break;
    case UnitType.Decimeter:
        isMetric = true;
        coefficient = 0.1;
        break;
    case UnitType.Millimeter:
        isMetric = true;
        coefficient = 0.001;
        break;
    case UnitType.Micrometer:
        isMetric = true;
        coefficient = 0.000001;
        break;
    case UnitType.Nanometer:
        isMetric = true;
        coefficient = 0.000000001;
        break;
    case UnitType.Angstrom:
        isMetric = true;
        coefficient = 0.0000000001;
        break;
    case UnitType.Inch:
        coefficient = 1.0;
        break;
    case UnitType.MicroInch:
        coefficient = 0.000001;
        break;
    case UnitType.Mil:
        coefficient = 0.001;
        break;
    case UnitType.Foot:
        coefficient = 12.0;
        break;
    case UnitType.Yard:
        coefficient = 36.0;
        break;
    case UnitType.Mile:
        coefficient = 63360.0;
        break;
}
        }

导出 DWG 到 PDF/A 和 PDF/E

此方法的工作流程如下：

1. 使用 Aspose.CAD.Image.Load 工厂方法加载 DWG 文件。
2. 创建 CadRasterizationOptions 类的实例。
3. 创建 PdfOptions 类的实例，并设置其 VectorRasterizationOptions 属性。
4. 设置 PDF 合规性属性并保存。
5. 使用 Image.Save() 方法将图像导出为 PDF。

下面的代码示例展示了如何将 DWG 文件转换为 PDF/A 和 PDF/E。

// The path to the documents directory.
string MyDir = RunExamples.GetDataDir_DWGDrawings();
string sourceFilePath = MyDir + "Bottom_plate.dwg";

Aspose.CAD.Image cadImage = Aspose.CAD.Image.Load(sourceFilePath);
 // Create an instance of CadRasterizationOptions and set its various properties
Aspose.CAD.ImageOptions.CadRasterizationOptions rasterizationOptions = new Aspose.CAD.ImageOptions.CadRasterizationOptions();
rasterizationOptions.BackgroundColor = Aspose.CAD.Color.White;
rasterizationOptions.PageWidth = 1600;
rasterizationOptions.PageHeight = 1600;


// Create an instance of PdfOptions
PdfOptions pdfOptions = new Aspose.CAD.ImageOptions.PdfOptions
{
VectorRasterizationOptions = rasterizationOptions
};

 pdfOptions.CorePdfOptions = new PdfDocumentOptions();

 pdfOptions.CorePdfOptions.Compliance = PdfCompliance.PdfA1a;
 cadImage.Save(MyDir + "PDFA1_A.pdf", pdfOptions);

 pdfOptions.CorePdfOptions.Compliance = PdfCompliance.PdfA1b;
 cadImage.Save(MyDir + "PDFA1_B.pdf", pdfOptions);

导出 DWG/DXF 到 BMP 和 PDF 时支持圆角隐藏线

此方法的工作流程如下：

1. 使用 Aspose.CAD.Image.Load 工厂方法加载 DWG 文件。
2. 创建 CadRasterizationOptions 类的实例，并设置结果页面的高度和宽度。
3. 创建 PdfOptions 类的实例，并设置其 VectorRasterizationOptions 属性。
4. 使用 Image.Save() 方法将图像导出为 PDF。

下面的代码示例展示了如何实现此功能。

// The path to the documents directory.
string MyDir = RunExamples.GetDataDir_DWGDrawings();
string sourceFilePath = MyDir + "Bottom_plate.dwg";
string outPath = MyDir + "Bottom_plate.pdf";
using (CadImage cadImage = (CadImage)Image.Load(sourceFilePath))
        {
CadRasterizationOptions rasterizationOptions = new CadRasterizationOptions();
rasterizationOptions.PageHeight = cadImage.Height;
rasterizationOptions.PageWidth = cadImage.Width;
rasterizationOptions.Layers = new string[] { "Print", "L1_RegMark", "L2_RegMark" };
           


PdfOptions pdfOptions = new PdfOptions();
rasterizationOptions.Layouts = new string[] { "Model" };
pdfOptions.VectorRasterizationOptions = rasterizationOptions;

cadImage.Save(outPath, pdfOptions);
}

Console.WriteLine("\nThe DWG file exported successfully to PDF.\nFile saved at " + MyDir);
        }

支持在导出的 PDF 中设置 DWG 图像的打印区域

Aspose.CAD for .NET API 可以加载 DWG 格式的 AutoCAD 绘图，并转换为 PDF。本主题讲解了如何使用 Aspose.CAD API 来实现对导出 PDF 中 DWG 图像的打印区域的设置支持。

下面的代码示例展示了如何实现此功能。

// The path to the documents directory.
string MyDir = RunExamples.GetDataDir_DWGDrawings();
string sourceFilePath = MyDir + "visualization_-_conference_room.dwg";
using (Aspose.CAD.Image image = Aspose.CAD.Image.Load(sourceFilePath))
{
    // Create an instance of CadRasterizationOptions and set its various properties
    Aspose.CAD.ImageOptions.CadRasterizationOptions rasterizationOptions = new Aspose.CAD.ImageOptions.CadRasterizationOptions();
    rasterizationOptions.PageWidth = 1600;
    rasterizationOptions.PageHeight = 1600;
    // Specify desired layout name
    rasterizationOptions.Layouts = new string[] { "Layout1" };

    // Create an instance of PdfOptions
    Aspose.CAD.ImageOptions.PdfOptions pdfOptions = new Aspose.CAD.ImageOptions.PdfOptions();
    // Set the VectorRasterizationOptions property
    pdfOptions.VectorRasterizationOptions = rasterizationOptions;

    MyDir = MyDir + "ExportSpecificLayoutToPDF_out.pdf";
    //Export the DWG to PDF
    image.Save(MyDir, pdfOptions);                
}

支持读取 DWG 文件的 XREF 元数据

1. 使用 Aspose.CAD.Image.Load 工厂方法加载 DWG 文件。
2. 遍历每个图像实体。
3. 如果实体为 CadUnderlay，则与元数据的 XREF 实体。

下面的代码示例展示了如何实现此功能。

// The path to the documents directory.
string MyDir = RunExamples.GetDataDir_DWGDrawings();
string sourceFilePath = MyDir + "Bottom_plate.dwg";
using (CadImage image = (CadImage)Image.Load(sourceFilePath))
{
    foreach (CadBaseEntity entity in image.Entities)
    {
        if (entity is CadUnderlay)
        {
            //XREF entity with metadata
            Cad3DPoint insertionPoint = ((CadUnderlay)entity).InsertionPoint;
            string path = ((CadUnderlay)entity).UnderlayPath;
        }
    }
}

属性 CadRasterizationOptions.Layouts 是字符串数组类型，因此您可以同时指定多个布局以进行可能的 PDF 格式转换。在为 CadRasterizationOptions.Layouts 属性指定多个布局时，生成的 PDF 将包含多个页面，每个页面代表一个单独的 AutoCAD 布局。

列出所有布局

您可以使用以下代码片段列出 AutoCAD 绘图中存在的所有布局。

// The path to the documents directory.
string MyDir = RunExamples.GetDataDir_ConvertingCAD();
string sourceFilePath = MyDir + "conic_pyramid.dxf";
using (Aspose.CAD.Image image = Aspose.CAD.Image.Load(sourceFilePath))
{
    Aspose.CAD.FileFormats.Cad.CadImage cadImage = (Aspose.CAD.FileFormats.Cad.CadImage)image;

    Aspose.CAD.FileFormats.Cad.CadLayoutDictionary layouts = cadImage.Layouts;
    foreach (Aspose.CAD.FileFormats.Cad.CadObjects.CadLayout layout in layouts.Values)
    {
        Console.WriteLine("Layout " + layout.LayoutName);
    }
}

访问 DWG 格式的覆盖旗标

Aspose.CAD for .NET 已实现 DWG 格式的覆盖旗标，并允许开发人员访问它们。以下是简单的代码演示。

            // Input file name and path
            string fileName = "BlockRefDgn.dwg";

            // Load an existing DWG file and convert it into CadImage 
            using (Aspose.CAD.FileFormats.Cad.CadImage image = (Aspose.CAD.FileFormats.Cad.CadImage)Image.Load(fileName))
            {
                // Go through each entity inside the DWG file
                foreach (Aspose.CAD.FileFormats.Cad.CadObjects.CadBaseEntity entity in image.Entities)
                {
                    // Check if entity is of CadDgnUnderlay type
                    if (entity is Aspose.CAD.FileFormats.Cad.CadObjects.CadDgnUnderlay)
                    {
                        // Access different underlay flags 
                        Aspose.CAD.FileFormats.Cad.CadObjects.CadUnderlay underlay = entity as Aspose.CAD.FileFormats.Cad.CadObjects.CadUnderlay;
                        Console.WriteLine(underlay.UnderlayPath);
                        Console.WriteLine(underlay.UnderlayName);
                        Console.WriteLine(underlay.InsertionPoint.X);
                        Console.WriteLine(underlay.InsertionPoint.Y);
                        Console.WriteLine(underlay.RotationAngle);
                        Console.WriteLine(underlay.ScaleX);
                        Console.WriteLine(underlay.ScaleY);
                        Console.WriteLine(underlay.ScaleZ);
                        Console.WriteLine((underlay.Flags & Aspose.CAD.FileFormats.Cad.CadObjects.UnderlayFlags.UnderlayIsOn) == Aspose.CAD.FileFormats.Cad.CadObjects.UnderlayFlags.UnderlayIsOn);
                        Console.WriteLine((underlay.Flags & Aspose.CAD.FileFormats.Cad.CadObjects.UnderlayFlags.ClippingIsOn) == Aspose.CAD.FileFormats.Cad.CadObjects.UnderlayFlags.ClippingIsOn);
                        Console.WriteLine((underlay.Flags & Aspose.CAD.FileFormats.Cad.CadObjects.UnderlayFlags.Monochrome) != Aspose.CAD.FileFormats.Cad.CadObjects.UnderlayFlags.Monochrome);
                        break;
                    }
                }
            }

支持 DWG 实体

Aspose.CAD for .NET API 可以加载 DWG 格式的 AutoCAD 绘图，并支持不同的实体进行操作。

支持 MLeader 实体

DWG 是一种包含矢量图像数据和元数据的二进制文件。DWG 文件中存在不同的实体。以下部分描述了如何在 DWG 文件中处理 MLeader 实体的示例。

// The path to the documents directory.
string MyDir = RunExamples.GetDataDir_DWGDrawings();
string file = MyDir + "sample.dwg";
using (Image image = Image.Load(file))
{
    // Test
    FileFormats.Cad.CadImage cadImage = (FileFormats.Cad.CadImage)image;

    Assert.AreNotEqual(cadImage.Entities.Length, 0);
    CadMLeader cadMLeader = (CadMLeader)cadImage.Entities[0];

    Assert.AreEqual(cadMLeader.StyleDescription, "Standard");
    Assert.AreEqual(cadMLeader.LeaderStyleId, "12E");
    Assert.AreEqual(cadMLeader.ArrowHeadId1, "639");
    Assert.AreEqual(cadMLeader.LeaderLineTypeID, "14");

    CadMLeaderContextData context = cadMLeader.ContextData;

    Assert.AreEqual(context.ArrowHeadSize, 30.0, 0.1);
    Assert.AreEqual(context.BasePoint.X, 481, 1);
    Assert.AreEqual(context.ContentScale, 1.0, 0.01);
    Assert.AreEqual(context.DefaultText.Value, "This is multileader with huge text\\P{\\H1.5x;6666666666666666666666666666\\P}bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb");
    Assert.AreEqual(context.HasMText, true);

    CadMLeaderNode mleaderNode = context.LeaderNode;

    Assert.AreEqual(mleaderNode.LastLeaderLinePoint.X, 473, 1);
    CadMLeaderLine leaderLine = mleaderNode.LeaderLine;

    Assert.AreEqual(leaderLine.BreakEndPoint, null);
    Assert.AreEqual(leaderLine.BreakPointIndex.Value, 0);
    Assert.AreEqual(leaderLine.BreakStartPoint, null);
    Assert.AreEqual(leaderLine.LeaderLineIndex.Value, 0);
    Assert.AreEqual(leaderLine.LeaderPoints.Count, 4);

    Assert.AreEqual(mleaderNode.BranchIndex, 0);
    Assert.AreEqual(mleaderNode.DogLegLength, 8.0, 0.1);

    Assert.AreEqual(context.HasMText, true);
    Assert.AreEqual(context.TextAttachmentType.Value, 1);
    Assert.AreEqual(context.TextBackgroundColor.Value, 18);
    Assert.AreEqual(context.TextHeight, 20.0, 0.1);
    Assert.AreEqual(context.TextStyleID.Value, "11");
    Assert.AreEqual(context.TextRotation.Value, 0.0, 0.01);

    Assert.AreEqual(cadMLeader.ArrowHeadId1, "639");
    Assert.AreEqual(cadMLeader.LeaderType, 1);
    Assert.AreEqual(cadMLeader.BlockContentColor, 0);
    Assert.AreEqual(cadMLeader.LeaderLineColor, 0);
    Assert.AreEqual(cadMLeader.TextHeight, 1.0, 0.01);
}

支持将 DWG 实体导出为图像

DWG 是一种包含矢量图像数据和元数据的二进制文件。DWG 文件中存在不同的实体。以下部分描述了将特定 DWG 实体导出为图像的示例。

string MyDir = RunExamples.GetDataDir_DWGDrawings();
string sourceFilePath = MyDir + "visualization_-_conference_room.dwg";
var cadImage = (CadImage)Aspose.CAD.Image.Load(sourceFilePath);

CadBaseEntity[] entities = cadImage.Entities;
List<CadBaseEntity> filteredEntities = new List<CadBaseEntity>();

foreach (CadBaseEntity baseEntity in entities)
{
    // selection or filtration of entities
    if (baseEntity.TypeName == CadEntityTypeName.TEXT)
    {
        filteredEntities.Add(baseEntity);
    }
    }

cadImage.Entities = filteredEntities.ToArray();

// Create an instance of CadRasterizationOptions and set its various properties
Aspose.CAD.ImageOptions.CadRasterizationOptions rasterizationOptions =
new Aspose.CAD.ImageOptions.CadRasterizationOptions();
rasterizationOptions.PageWidth = 1600;
rasterizationOptions.PageHeight = 1600;

// Set Auto Layout Scaling
rasterizationOptions.AutomaticLayoutsScaling = true;

// Create an instance of PdfOptions
Aspose.CAD.ImageOptions.PdfOptions pdfOptions = new Aspose.CAD.ImageOptions.PdfOptions();

// Set the VectorRasterizationOptions property
pdfOptions.VectorRasterizationOptions = rasterizationOptions;

string outFile = MyDir + "result_out_generated.pdf";

// Export the CAD to PDF
cadImage.Save(outFile, pdfOptions);

支持在 DWG 中添加文本

Aspose.CAD for .NET API 可以加载 DWG 格式的 AutoCAD 绘图，并支持不同的实体进行操作。DWG 是一种包含矢量图像数据和元数据的二进制文件。DWG 文件中存在不同的实体。以下部分描述了如何在 DWG 文件中添加文本。

string MyDir = RunExamples.GetDataDir_DWGDrawings();
string dwgPathToFile = MyDir + "SimpleEntites.dwg";
using (Image image = Image.Load(dwgPathToFile))
{
    CadText cadText = new CadText();
    cadText.StyleType = "Standard";
    cadText.DefaultValue = "Some custom text";
    cadText.ColorId = 256;
    cadText.LayerName = "0";
    cadText.FirstAlignment.X = 47.90;
    cadText.FirstAlignment.Y = 5.56;
    cadText.TextHeight = 0.8;
    cadText.ScaleX = 0.0;
    CadImage cadImage = (CadImage)image;
    cadImage.BlockEntities["*Model_Space"].AddEntity(cadText);

    PdfOptions pdfOptions = new PdfOptions();
    CadRasterizationOptions cadRasterizationOptions = new CadRasterizationOptions();
    pdfOptions.VectorRasterizationOptions = cadRasterizationOptions;
    cadRasterizationOptions.DrawType = CadDrawTypeMode.UseObjectColor;
    
    cadRasterizationOptions.PageHeight = 1600;
    cadRasterizationOptions.PageWidth = 1600;
    cadRasterizationOptions.Layouts = new string[] { "Model" };
    image.Save(MyDir+"SimpleEntites_generated.pdf", pdfOptions);
}
        

支持将图像导入到 DWG 文件中

Aspose.CAD for .NET API 可以加载 DWG 格式的 AutoCAD 绘图，并支持不同的实体进行操作。DWG 是一种包含矢量图像数据和元数据的二进制文件。DWG 文件中存在不同的实体。以下部分描述了如何将图像导入 DWG 文件中。

// For complete examples and data files, please go to https://github.com/aspose-cad/Aspose.CAD-for-.NET
string dwgPathToFile = MyDir + "Drawing11.dwg";

CadImage cadImage1 = (CadImage)Image.Load(dwgPathToFile);

CadRasterImageDef cadRasterImageDef = new CadRasterImageDef("road-sign-custom.png", 640, 562);
cadRasterImageDef.ObjectHandle = "A3B4";

Cad3DPoint insertionPoint = new Cad3DPoint(26.77, 22.35);
Cad3DPoint uVector = new Cad3DPoint(0.0061565450840500831, 0);
Cad3DPoint vVector = new Cad3DPoint(0, 0.0061565450840500822);

CadRasterImage cadRasterImage = new CadRasterImage(cadRasterImageDef, insertionPoint, uVector, vVector);
cadRasterImage.ImageDefReference = "A3B4";
cadRasterImage.DisplayFlags = 7;
cadRasterImage.ClippingState = 0;
cadRasterImage.ClipBoundaryVertexList.Add(new Cad2DPoint(-0.5, 0.5));
cadRasterImage.ClipBoundaryVertexList.Add(new Cad2DPoint(639.5, 561.5));

CadImage cadImage = (CadImage)cadImage1;
cadImage.BlockEntities["*Model_Space"].AddEntity(cadRasterImage);

List<CadBaseObject> list = new List<CadBaseObject>(cadImage.Objects);
list.Add(cadRasterImageDef);
cadImage.Objects = list.ToArray();


PdfOptions pdfOptions = new PdfOptions();
CadRasterizationOptions cadRasterizationOptions = new CadRasterizationOptions();
pdfOptions.VectorRasterizationOptions = cadRasterizationOptions;
cadRasterizationOptions.DrawType = CadDrawTypeMode.UseObjectColor;

cadRasterizationOptions.PageHeight = 1600;
cadRasterizationOptions.PageWidth = 1600;
cadRasterizationOptions.Layouts = new string[] { "Model" };
cadImage1.Save(MyDir + "export2.pdf", pdfOptions);

支持在 DWG 中的网格

Aspose.CAD for .NET API 现在可以访问支持网格的实体，其中包括 CadPolyFaceMesh 和 CadPolygonMesh 类型。以下示例描述了如何访问网格类型。

// The path to the documents directory.
string MyDir = RunExamples.GetDataDir_DWGDrawings();
string sourceFilePath = MyDir + "meshes.dwg";

// Load an existing DWG file as CadImage.
using (CadImage cadImage = (CadImage)Image.Load(sourceFilePath))
{
    foreach (var entity in cadImage.Entities)
    {
        if (entity is CadPolyFaceMesh)
        {
            CadPolyFaceMesh asFaceMesh = (CadPolyFaceMesh)entity;

            if (asFaceMesh != null)
            {
                Console.WriteLine("Vetexes count: " + asFaceMesh.MeshMVertexCount);
            }
        }

        else if (entity is CadPolygonMesh)
        {
            CadPolygonMesh asPolygonMesh = (CadPolygonMesh)entity;

            if (asPolygonMesh != null)
            {
                Console.WriteLine("Vetexes count: " + asPolygonMesh.MeshMVertexCount);
            }
        }
    }
}

将 DWG 绘图转换为 DXF

Aspose.CAD 提供了加载 AutoCAD DWG 文件并将其导出为 DXF 格式的功能。DWG 转 DXF 转换方法的工作流程如下：

1. 使用 Image.Load 工厂方法加载 DWG 绘图文件。
2. 使用 Image.Save() 方法将 DWG 绘图导出为 DXF。

下面的代码示例展示了如何将 DWG 文件转换为 DXF 格式。

string MyDir = RunExamples.GetDataDir_DWGDrawings();
string inputFile = MyDir + "Line.dwg";
string outFile = MyDir + "Line_19.2.dxf"; 
using (var cadImage = (CadImage)Image.Load(inputFile))
{
    cadImage.Save(outFile);
}

将 DWG 绘图转换为 SVG

Aspose.CAD for .NET API 可以加载 DWG 格式的 AutoCAD 绘图，并将其转换为 SVG。本主题讲解了如何通过以下简单步骤使用 Aspose.CAD API 实现 DWG 转 SVG 的转换。

1. 将 DWG 文件加载到 Image 的实例中。
2. 创建一个 SvgOptions 类的对象，并设置所需的属性。
3. 使用 Image.Save() 方法将 DWG 绘图导出为 SVG。

下面的代码示例展示了如何将 DWG 文件转换为 SVG 格式。

// The path to the documents directory.
string MyDir = RunExamples.GetDataDir_DWGDrawings();

using (Image image = Image.Load(MyDir + "sample.dwg"))
{
    var options = new SvgOptions();
    options.ColorType = Aspose.CAD.ImageOptions.SvgOptionsParameters.SvgColorMode.Grayscale;
    options.TextAsShapes = true;
    image.Save(MyDir + "sample.svg");
}

加载大型 DWG 文件

Aspose.CAD for .NET 提供了使用 Image 类打开大型 DWG 文件的功能。现在，您可以通过下面提供的示例代码轻松打开大型文件。

// The path to the documents directory.
string MyDir = RunExamples.GetDataDir_DWGDrawings();

string filePathDWG = MyDir + "TestBigFile.dwg";
string filePathFinish = MyDir+ "TestBigFile.dwg.pdf";
Stopwatch stopWatch = new Stopwatch();


try
{
    stopWatch.Start();
    using (CadImage cadImage = (CadImage)Image.Load(filePathDWG))
    {
        stopWatch.Stop();


        // Get the elapsed time as a TimeSpan value. 
        TimeSpan ts = stopWatch.Elapsed;

        // Format and display the TimeSpan value. 
        string elapsedTime = String.Format("{0:00}:{1:00}:{2:00}.{3:00}",
            ts.Hours, ts.Minutes, ts.Seconds,
            ts.Milliseconds / 10);
        Console.WriteLine("RunTime for loading " + elapsedTime);

        CadRasterizationOptions rasterizationOptions = new CadRasterizationOptions();
        rasterizationOptions.PageWidth = 1600;
        rasterizationOptions.PageHeight = 1600;
        PdfOptions pdfOptions = new PdfOptions();
        pdfOptions.VectorRasterizationOptions = rasterizationOptions;

        stopWatch = new Stopwatch();
        stopWatch.Start();
        cadImage.Save(filePathFinish, pdfOptions);
        stopWatch.Stop();

        // Get the elapsed time as a TimeSpan value. 
        ts = stopWatch.Elapsed;

        // Format and display the TimeSpan value. 
        elapsedTime = String.Format("{0:00}:{1:00}:{2:00}.{3:00}",
           ts.Hours, ts.Minutes, ts.Seconds,
           ts.Milliseconds / 10);
        Console.WriteLine("RunTime for converting " + elapsedTime);
    }
}
catch (Exception ex)
{
    Console.WriteLine(ex.Message);
    
}