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3 Reading DXF Files
Figure 1: dxflib parses DXF files and calls functions in your class. In those functions you can for example add the entities to a vector or list of entities.
Implementing the Creation Interface
Your C++ class that handles DXF entities has to be derived from DL_CreationInterface or DL_CreationAdapter. In most cases DL_CreationAdapter is more convenient because it doesn't force you to implement all functions.
class MyDxfFilter : public DL_CreationAdapter {
virtual void addLine(const DL_LineData& d);
...
}
The implementation of the functions in your class will typically add the entities to a container of entities or use the information in another way.
void MyDxfFilter::addLine(const DL_LineData& d) {
std::cout << "Line: " << d.x1 << "/" << d.y1
<< " " << d.x2 << "/" << d.y2 << std::endl;
}
When reading a DXF file you simply pass on a reference to an object of your class to the parser.
MyDxfFilter f;
DL_Dxf* dxf = new DL_Dxf();
if (!dxf->in("drawing.dxf", &f)) {
std::cerr << "drawing.dxf could not be opened.\n";
}
delete dxf;
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