![]() if "cancel" button is clicked then // nothing will be done. OpenFileDialog1.Filter = " DXF files (*.dxf)|*.dxf|All files (*.*)|*.*" // filters the // visible files. OpenFileDialog1.InitialDirectory = " c:\\ " // sets the initial directory of the // openfile dialog Private void menuItem2_Click( object sender, System.EventArgs e) // Opens openfile // dialog to select a DXF file When you click File/Open, the following method will be called: Separating these methods from the drawing methods would be much better but for now this is all I can present. In the near future, I'm planning to add B-Spline too.ĭXF Interpretation methods are included in the canvas class. ![]() Currently Line, Polyline, Circle and Arc shapes of the AutoCAD can be recognized. There is a Canvas class for drawing and a Shape class for defining objects. You can open multiple DXF files for viewing. The data is extracted from the DXF file and interpreted and then necessary methods of the viewer are called and the result is shown on the screen.Īlthough the intended structure is as above, the code itself is not separated this much. Well, as you can see, the structure is as above. (I'll try to provide details later on.) General Structure DXF File However, the only interaction that the editor presents to the user is to highlight the shapes (to highlight keep shift button pressed while moving the cursor). And the project become partially a DXF reader and mainly a viewer program, and I also made a drawing editor. But then I found out that a reader by itself will have no value, there should also be a viewer. After various scans through the net, I came across the DXF specification of the AutoCAD and I decided to make my own reader. There are a couple of DXF writer projects here in CodeProject (one is from Omid Shahabi, the other is from Claude Gagnon), but I couldn't find a DXF reader which reads DXF files. In fact, at the beginning my sole purpose was to extract data from a DXF file but later on interpretation and drawing of the data on the screen started to take much more time and shaded the priority of the data extraction. Now you can make the parser code more robust to variations in the whitespace ( and also more concise ).This project mainly deals with reading a DXF file, but in order to demonstrate the reader is working I also included a viewer, which interprets the data and draw it on the screen. */ void CDxf::ReadUntilCode( FILE * fp, int TargetCode, char* lpValue ) * * Read DXF file until get a particular group fp the open DXF TargetCode The group code we are looking lpValue a 255 character array to hold the value string ( may contain spaces ) Size_t p = sCode.find_first_not_of( " ") remove leading whitespace from the group code string sCode( lpCode ) */ void CDxf::ReadTwoLines( FILE * fp, int& iCode, char* lpCode, char* lpValue ) * * Read next two lines from a DXF file - a group code and a fp the open DXF iCode the group code, as an lpCode a 255 character array to hold the group code lpValue a 255 character array to hold the value string ( may contain spaces ) In order to load sample.dxf file, use the following code: Use LoadFile member function of CDxf class to hold the file. You may improve them for your own purposes. These classes are in very basic structure. CLine, CPolyline, CArc, CCircle and CSpline classes are used to hold the entities. The source code is organized by C++ classes to provide you easy integration into your own code. Highlight and selection of each entity, indication of points, sliding, zoom in, zoom out and pan zoom functionalities are available. Afterwards, they are drawn on the screen. All the entities in the file are loaded into proper classes when the file is opened. ![]() Line, lwpolyline, arc, circle and spline entities are supported. I used C++ classes to provide you easy integration of reader to your project. So, I decided to implement a basic DXF reader supporting spline entity. In the comments of these articles, I have seen that other developers need it. Both are C# code and have no spline solution. NET: Read and View AutoCAD Format Files by Chuzhakin. One is A DXF Reader Solution and Simple DXF Viewer by Evren Daglioglu, another is DXF Import. I searched a DXF reader source code in the CodeProject archive and found two articles. The aim of this tip is to deal with DXF files with the most common AutoCAD entities.
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