Export DGN to DWG with Aspose.CAD for Java

Introduction

In this tutorial, we’ll explore how to use Aspose.CAD for Java to export a DGN (MicroStation Design) file as part of a DWG (AutoCAD Drawing) file. Aspose.CAD is a powerful library that provides comprehensive functionality to work with CAD file formats. This step-by-step guide will help you understand the process of exporting DGN as part of DWG using Java.

Prerequisites

Before we dive into the tutorial, make sure you have the following prerequisites in place:

1. Aspose.CAD Library: Download and install the Aspose.CAD library for Java. You can find the library here.
2. Java Development Kit (JDK): Ensure that you have Java installed on your system.
3. Integrated Development Environment (IDE): Choose a Java IDE like Eclipse or IntelliJ for a smoother development experience.

Import Packages

In your Java project, import the necessary Aspose.CAD packages to enable CAD file manipulation. Here’s an example:

import com.aspose.cad;
import com.aspose.cad.imageoptions;
import com.aspose.cad.fileformats.cad.cadconsts;
import com.aspose.cad.fileformats.cad;
import com.aspose.cad.fileformats.cad.cadobjects;

Step 1: Set File Paths

Define the input and output file paths for the DWG file. Update the dataDir, fileName, and outPath variables accordingly.

String dataDir = "Your Document Directory" + "ExportingDGN/";
String fileName = dataDir + "BlockRefDgn.dwg";
String outPath = dataDir + "BlockRefDgn.dwg.pdf";

Step 2: Create PdfOptions Instance

Create an instance of the PdfOptions class, as we are exporting the DWG file to PDF format.

PdfOptions exportOptions = new PdfOptions();

Step 3: Load DWG File

Load the existing DWG file as an image and convert it to the CadImage type.

CadImage cadImage = (CadImage) Image.load(fileName);

Step 4: Iterate Through Entities

Go through each entity inside the DWG file and check if it is an image definition. If it is, retrieve the external reference to the object.

for (CadBaseEntity baseEntity : cadImage.getEntities()) {
    if (baseEntity.getTypeName() == CadEntityTypeName.DGNUNDERLAY) {
        CadDgnUnderlay dgnFile = (CadDgnUnderlay)baseEntity;
        System.out.println(dgnFile.getUnderlayPath());
    }
}

Step 5: Define Rasterization Options

Define settings for the CadRasterizationOptions object, including page width, height, layouts, and background color.

CadRasterizationOptions vectorRasterizationOptions = new CadRasterizationOptions();
vectorRasterizationOptions.setPageWidth(1600);
vectorRasterizationOptions.setPageHeight(1600);
vectorRasterizationOptions.setLayouts(new String[] { "Model" });
vectorRasterizationOptions.setAutomaticLayoutsScaling(false);
vectorRasterizationOptions.setNoScaling(true);
vectorRasterizationOptions.setBackgroundColor(Color.getBlack());
vectorRasterizationOptions.setDrawType(CadDrawTypeMode.UseObjectColor);

Step 6: Set Vector Rasterization Options

Set the vector rasterization options for the export.

exportOptions.setVectorRasterizationOptions(vectorRasterizationOptions);

Step 7: Export DWG to PDF

Finally, export the DWG to PDF by calling the save method.

cadImage.save(outPath, exportOptions);

Conclusion

Congratulations! You’ve successfully learned how to export a DGN file as part of a DWG file using Aspose.CAD for Java. This powerful library provides extensive capabilities for working with CAD files, making your CAD file manipulation tasks efficient and straightforward.

FAQ’s

Q1: Where can I find the documentation for Aspose.CAD for Java?

A1: The documentation can be found here.

Q2: How can I download the Aspose.CAD library for Java?

A2: You can download the library from this link.

Q3: Is there a free trial available for Aspose.CAD for Java?

A3: Yes, you can find the free trial here.

Q4: Where can I get a temporary license for Aspose.CAD for Java?

A4: Obtain a temporary license here.

Q5: Need help or have questions?

A5: Visit the Aspose.CAD community support forum here.