DXF image entity group code explanation
问题 I'm working on a Delphi class to import/export some kind of entities from DXF file. I'd like add support for Image entity but I don't understand some group codes. I'm using official DXF guide reference (2002): http://www.autodesk.com/techpubs/autocad/dxf/dxf2002.pdf I have understand the group codes 10, 20 and 30, there are the "Insertion point" and work like any other entities. The problem are group codes: -11, 21 and 31: U-vector of a single pixel (points along the visual bottom of the