Working with Watermark

Add Watermark in a DWG

Sometimes you want to add some watermarks to drawings to indicate what purpose of the drawings or who created them. Aspose.CAD for Java allows you to add a watermark in a DWG file. This can be done through creating a Text or MText entity with a specific text height, rotation, style, adjustments and such should be adjusted as well to give a good look. For this, the API provides CadMText and CadText classes.

Sample Code

The code below shows how to achieve the same goal using Aspose.CAD for Java

String dataDir = Utils.getDataDir(AddWatermark.class) + "DWGDrawings/";
// Path to source file
String sourceFilePath = dataDir+"Drawing11.dwg";
        
CadImage cadImage = (CadImage) Image.load(sourceFilePath);
        
//add new MTEXT
CadMText watermark = new CadMText();
watermark.setText("Watermark message");
watermark.setInitialTextHeight(40);
watermark.setInsertionPoint(new Cad3DPoint(300, 40));
watermark.setLayerName("0");
cadImage.getBlockEntities().get_Item("*Model_Space").addEntity(watermark);
        
        
        
// or add more simple entity like Text
CadText text = new CadText();
text.setDefaultValue("Watermark text");
text.setTextHeight(40);
text.setFirstAlignment(new Cad3DPoint(300, 40));
text.setLayerName("0") ;
cadImage.getBlockEntities().get_Item("*Model_Space").addEntity(text);
        
        
        
// export to pdf
CadRasterizationOptions rasterizationOptions = new CadRasterizationOptions();
rasterizationOptions.setPageWidth(1600);
rasterizationOptions.setPageHeight(1600);
rasterizationOptions.setLayouts(new String[]{"Model"});
PdfOptions pdfOptions = new PdfOptions();
pdfOptions.setVectorRasterizationOptions(rasterizationOptions);
cadImage.save(dataDir + "AddWatermark_out.pdf", pdfOptions);