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Visual C++ Example: DXF File Drawing, load, write


By Claude Gagnon

  • This article demonstrate how to write an ASCII DXF files. A DXF file is a file composed of sections and associated values. They are read by AutoCad and then converted to a drawing.

    I have developped a class CDxf to write a DXF file from an application. Then the user must use AutoCad to interpret the DXF file.

    I have included only a small portion of what can be do with DXF files. All the details are contained in the following document from the AutoDesk web site :

    // Here is the code to write a DXF file that will draw a circle in AutoCad.
    void CDxf::Circle ()
    	// 1000 diameter circle
    	// Creation of an output stream objet in text mode.
    	// ios::app : append
    	ofstream FichierDxf ("TestDxf.dxf", ios::app);
    	// Draw the circle
    	FichierDxf << 0          << endl;
    	FichierDxf << "CIRCLE"   << endl;
    	FichierDxf << 8          << endl;       // Group code for layer name
    	FichierDxf << 0          << endl;       // Layer number
    	FichierDxf << 10         << endl;       // Center point of circle
    	FichierDxf << 0.0        << endl;       // X in OCS coordinates
    	FichierDxf << 20         << endl;
    	FichierDxf << 0.0        << endl;       // Y in OCS coordinates
    	FichierDxf << 30         << endl;
    	FichierDxf << 0.0        << endl;       // Z in OCS coordinates
    	FichierDxf << 40         << endl;       // radius of circle
    	FichierDxf << 500.0      << endl;       

    By being able to write a DXF file, I can integrate into my applications a way to share information with AutoCad. Obviously there is a lot more that can be added to this class.

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