Introduction to Aspose.CAD, Part 5

In this part I will again continue to describe Aspose.CAD features specific to DWG\DXF files, as these file formats are the most common use for Aspose.CAD.

Here are the previous articles:

Part 1

Part 2

Part 3

Part 4

Export of 3D objects

To export 3D objects from DWG\DXF file, just set TypeOfEntities property of CadRasterizationOptions instance to TypeOfEntities.Entities3D and perform export:

using (Aspose.CAD.Image cadImage = Aspose.CAD.Image.Load("source.dxf"))
{
    Aspose.CAD.ImageOptions.CadRasterizationOptions rasterizationOptions 
        = new Aspose.CAD.ImageOptions.CadRasterizationOptions();
    rasterizationOptions.PageWidth = 500;
    rasterizationOptions.PageHeight = 500;
    rasterizationOptions.TypeOfEntities = TypeOfEntities.Entities3D;
    
    
    PdfOptions pdfOptions = new PdfOptions();
    pdfOptions.VectorRasterizationOptions = rasterizationOptions;
   
    cadImage.Save("export3d.pdf", pdfOptions);
}

Searching the text in a CAD file

This is a bit more complex task, as there are several kinds of entities that might contain text, including nested entities. Here is a code snippet that will show how to handle all of them:

private static void IterateCADNodes(CadBaseEntity obj) 
{ 
  switch (obj.TypeName) { 
      case CadEntityTypeName.TEXT: 
          CadText childObjectText = (CadText) obj; 

          Console.WriteLine(childObjectText.DefaultValue); 

          break; 

      case CadEntityTypeName.MTEXT: 
          CadMText childObjectMText = (CadMText) obj; 

          Console.WriteLine(childObjectMText.Text); 

          break; 

      case CadEntityTypeName.INSERT: 
          CadInsertObject childInsertObject = (CadInsertObject) obj; 

          //Iterate over subnodes
          foreach (var tempobj in childInsertObject.ChildObjects) { 
              IterateCADNodes(tempobj); 
          } 
          break; 

      case CadEntityTypeName.ATTDEF: 
          CadAttDef attDef = (CadAttDef) obj; 

          Console.WriteLine(attDef.DefaultString); 
          break; 

      case CadEntityTypeName.ATTRIB: 
          CadAttrib attAttrib = (CadAttrib) obj; 

          Console.WriteLine(attAttrib.DefaultText); 
          break; 
  } 
}

And to iterate over both block and non-block entities, use this code:

public static void SearchTextInDWGAutoCADFile(CadImage cadImage) 
{ 
  
   // Search for text in the entities section 
   foreach (var entity in cadImage.Entities) { 
       IterateCADNodes(entity); 
   } 

   // Search for text in the block section 
   foreach (CadBlockEntity blockEntity in cadImage.BlockEntities.Values) { 
       foreach (var entity in blockEntity.Entities) { 
           IterateCADNodes(entity); 
       } 
   } 
} 

For now, that’s all, stay tuned!

For more examples please visit the Aspose.CAD GitHub page. There’s also Twitter and Facebook pages for news on Aspose.CAD.

Written on April 29, 2018