ترسیم DGN

ترسیم فرمت DGN به عنوان بخشی از DWG

Aspose.CAD برای .NET به توسعه‌دهندگان اجازه می‌دهد تا یک فایل DWG را با DGN داخلی صادر کنند. در زیر کدی ارائه شده است که نشان می‌دهد چگونه می‌توان به DGN درون یک فایل DWG دسترسی پیدا کرد در حین صدور فایل DWG.

کد نمونه

// The path to the documents directory.
string MyDir = RunExamples.GetDataDir_ConvertingCAD();
string[] sourceFilePaths = new[] 
{
    MyDir + "conic_pyramid.dxf",
    MyDir + "Bottom_plate.dwg"
};

foreach (var sourceFilePath in sourceFilePaths)
{
    string extension = Path.GetExtension(sourceFilePath);
    using (CadImage cadImage = (CadImage)Aspose.CAD.Image.Load(sourceFilePath))
    {
        List<string> layouts = GetNotEmptyLayouts(cadImage, extension);
        const double Epsilon = 0.00001;
        foreach (string layout in layouts)
        {
            System.Console.WriteLine("Layout= " + layout);
            using (FileStream fs = new FileStream(MyDir + "layout_" + extension + "_" + layout + ".jpg", FileMode.Create))
            {
                JpegOptions jpegOptions = new JpegOptions();
                CadRasterizationOptions options = new CadRasterizationOptions();
                options.Layouts = new string[] { layout };

                CadLayout l = cadImage.Layouts[layout];

                if ((Math.Abs(l.MaxExtents.Y) < Epsilon && Math.Abs(l.MaxExtents.X) < Epsilon)
                    || (Math.Abs(l.MaxExtents.Y + 1E+20) < Epsilon
                    || Math.Abs(l.MaxExtents.X + 1E+20) < Epsilon)
                    || (Math.Abs(l.MinExtents.Y - 1E+20) < Epsilon
                    || Math.Abs(l.MinExtents.X - 1E+20) < Epsilon))
                {
                    // do nothing, we can automatically detect size
                    // we can not rely on PlotPaperUnits here too because it is PlotInInches by default
                }
                else
                {
                    double sizeExtX = l.MaxExtents.X - l.MinExtents.X;
                    double sizeExtY = l.MaxExtents.Y - l.MinExtents.Y;

                    if (l.PlotPaperUnits == CadPlotPaperUnits.PlotInInches)
                    {
                        options.PageHeight = CommonHelper.INtoPixels(sizeExtY, CommonHelper.DPI);
                        options.PageWidth = CommonHelper.INtoPixels(sizeExtX, CommonHelper.DPI);
                    }
                    else
                    {
                        if (l.PlotPaperUnits == CadPlotPaperUnits.PlotInMillimeters)
                        {
                            options.PageHeight = CommonHelper.MMtoPixels(sizeExtY, CommonHelper.DPI);
                            options.PageWidth = CommonHelper.MMtoPixels(sizeExtX, CommonHelper.DPI);
                        }
                        else
                        {
                            options.PageHeight = (float)sizeExtY;
                            options.PageWidth = (float)sizeExtX;
                        }
                    }
                }

                
                jpegOptions.VectorRasterizationOptions = options;

                cadImage.Save(fs, jpegOptions);
            }
        }
    }
}
        }

private static List<string> GetNotEmptyLayouts(Image cadImage, string extension)
        {
List<string> nonEmptyLayouts = new List<string>();
if (cadImage == null)
    return nonEmptyLayouts;

switch (extension)
{
    case ".dwg":
        nonEmptyLayouts = GetNotEmptyLayoutsForDwg((CadImage)cadImage);
        break;
    case ".dxf":
        nonEmptyLayouts = GetNotEmptyLayoutsForDxf((CadImage)cadImage);
        break;
}

return nonEmptyLayouts;
        }

private static List<string> GetNotEmptyLayoutsForDwg(CadImage cadImage)
        {
List<string> notEmptyLayouts = new List<string>();

foreach (CadLayout layout in cadImage.Layouts.Values)
{
    foreach (CadBlockTableObject tableObject in cadImage.BlocksTables)
    {
        if (string.Equals(tableObject.HardPointerToLayout.Value, layout.ObjectHandle, StringComparison.InvariantCultureIgnoreCase))
        {
            if (cadImage.BlockEntities.ContainsKey(tableObject.BlockName))
            {
                CadBlockEntity cadBlockEntity = cadImage.BlockEntities[tableObject.BlockName];
                if (cadBlockEntity.Entities.Length > 0)
                    notEmptyLayouts.Add(layout.LayoutName);
            }
            break;
        }
    }
}

return notEmptyLayouts;
        }

private static List<string> GetNotEmptyLayoutsForDxf(CadImage cadImage)
        {
List<string> notEmptyLayouts = new List<string>();

Dictionary<string, string> layoutBlockHandles = new Dictionary<string, string>();
foreach (CadLayout layout in cadImage.Layouts.Values)
{
    if (layout.BlockTableRecordHandle != null)
        layoutBlockHandles.Add(layout.BlockTableRecordHandle, layout.LayoutName);
}

foreach (CadBaseEntity entity in cadImage.Entities)
{
    if (layoutBlockHandles.ContainsKey(entity.SoftOwner.Value))
    {
        string layoutName = layoutBlockHandles[entity.SoftOwner.Value];
        if (!notEmptyLayouts.Contains(layoutName))
            notEmptyLayouts.Add(layoutName);
    }
}

return notEmptyLayouts;
        }