DGN Drawing

Drawing DGN Format As Part of DWG

Aspose.CAD for Java allows developers to export a DWG file with embedded DGN underlay inside. Following is the code demonstrating how to access the DGN underlay inside a DWG file while exporting the DWG file.

        
// Input and Output file paths
    String dataDir = Utils.getDataDir(ExportDGNAsPartofDWG.class) + "ExportingDGN/";
// Input and Output file paths
String fileName = dataDir + "BlockRefDgn.dwg";
String outPath = dataDir +"BlockRefDgn.dwg.pdf";

// Create an instance of PdfOptions class as we are exporting the DWG file to PDF format
com.aspose.cad.imageoptions.PdfOptions exportOptions = new com.aspose.cad.imageoptions.PdfOptions();

// Load any existing DWG file as image and convert it to CadImage type
com.aspose.cad.fileformats.cad.CadImage cadImage = (com.aspose.cad.fileformats.cad.CadImage) com.aspose.cad.Image.load(fileName);

// Go through each entity inside the DWG file
for (com.aspose.cad.fileformats.cad.cadobjects.CadBaseEntity baseEntity : cadImage.getEntities())
{
    // Check if entity is an image definition
    if (baseEntity.getTypeName() == com.aspose.cad.fileformats.cad.cadconsts.CadEntityTypeName.DGNUNDERLAY)
    {
        com.aspose.cad.fileformats.cad.cadobjects.CadDgnUnderlay dgnFile = (com.aspose.cad.fileformats.cad.cadobjects.CadDgnUnderlay)baseEntity;

        // Get external reference to object
        System.out.println(dgnFile.getUnderlayPath());
    }
}

// Define settings for CadRasterizationOptions object
com.aspose.cad.imageoptions.CadRasterizationOptions vectorRasterizationOptions = new com.aspose.cad.imageoptions.CadRasterizationOptions();
vectorRasterizationOptions.setPageWidth(1600);
vectorRasterizationOptions.setPageHeight(1600);
vectorRasterizationOptions.setLayouts(new String[] { "Model" });
vectorRasterizationOptions.setAutomaticLayoutsScaling(false);
vectorRasterizationOptions.setNoScaling(true);
      
vectorRasterizationOptions.setBackgroundColor(com.aspose.cad.Color.getBlack());
vectorRasterizationOptions.setDrawType(com.aspose.cad.fileformats.cad.CadDrawTypeMode.UseObjectColor);

// Set Vector Rasterization Options
exportOptions.setVectorRasterizationOptions(vectorRasterizationOptions);

// Export the DWG to PDF by calling Save method
cadImage.save(outPath, exportOptions);

3D entities support for DGN v7

Aspose.CAD for Java API has introduced the functionality to load a DGN AutoCAD file and support 3D entities for DGN v7. The CadImage class serves the purpose. Each DGN image supports 9 predefined views. It’s enumerated from 1 to 9. If view not defined on export, for multi-paged output formats (like PDF) all views will be exported, each on a separate page. 3D entities supported on DGN file format, as well as 2D. VectorRasterizationOptions.TypeOfEntities is not used anymore for DGN format (both 2d and 3d are supported simultaneously).

Sample code to look at supported DGN elements.

String fileName = dataDir + "Nikon_D90_Camera.dgn";
String outFile  = dataDir + "Nikon_D90_Camera.dgn";
            
DgnImage objImage = (DgnImage)com.aspose.cad.Image.load(fileName);
            
    PdfOptions options = new PdfOptions();
    CadRasterizationOptions vectorOptions = new CadRasterizationOptions();
    vectorOptions.setPageWidth(1500);
    vectorOptions.setPageHeight(1500);
    vectorOptions.setAutomaticLayoutsScaling(true);
    vectorOptions.setBackgroundColor(Color.getBlack());
    vectorOptions.setLayouts(new String[] { "1", "2", "3", "9" });//only export 4 (1,2,3 and 9) views
    options.setVectorRasterizationOptions(vectorOptions);

    objImage.save(outFile, options);
            

// Input and Output file paths
String fileName = "BlockRefDgn.dwg";
String outPath = "BlockRefDgn.dwg.pdf";
       
DgnImage dgnImage = (DgnImage)Image.load(dataDir);
{
    for (DgnDrawingElementBase element : dgnImage.getElements())
    {
        switch (element.getMetadata().getType())
        {
            case DgnElementType.Line:
            case DgnElementType.Ellipse:
            case DgnElementType.Curve:
            case DgnElementType.BSplineCurveHeader:
            case DgnElementType.Arc:
            case DgnElementType.Shape:
            case DgnElementType.PolyLine:
            case DgnElementType.TextNode:
            case DgnElementType.Text:
            case DgnElementType.ComplexShapeHeader:
            case DgnElementType.ComplexChainHeader:
            {
                //previously supported entities, now supported also for 3D
                break;
            }

            case DgnElementType.SolidHeader3D:
            case DgnElementType.Cone:
            case DgnElementType.CellHeader:
            {
                //supported 3D entities
                break;
            }
        }