Writing to dxf or dwg format?

Question

I have the X and Y values for a curve in C# and I want them to be drawn in a dxf or dwg file format using the same C# project.

Is there a way to do that?

Thank you.

Answer 1

CadLib can write DXF and DWG files, definitely easier than going through the DXF specification yourself. There are a few free libraries out there for writing DXF as well. If you're requirements are basic, then these might be good enough.

Answer 2

A long time ago I wrote a DXF writer with VB.NET 2003, that I have converted to C#. It has methods for line, circle, arc, text, dimension, rectangle, polyline and points. You use it like this:

DxfMaker dxf = new DxfMaker();

float[,] points = new float[,]
{
    { 0, 10 },
    { 1, 12 },
    { 2, 17 },
    { 3, 14 },
    { 4, 9  }
};
int N = points.GetLength(0);
for (int i = 1; i < N; i++)
{
    dxf.DXF_Line(
        points[i - 1, 0], points[i - 1, 1], 0,
        points[i, 0], points[i, 1], 0);
}

dxf.DXF_Save("curve.dxf");

The project with the source code is shared here. Caveat is because it was VB originally some of the numerical types are inconsistent (between float and double) by the results are good. Original code for DXF was taken from elsewhere (see comments) and adapted to my needs.

Answer 3

If you are generating data in C# the easiest way to the results in AutoCAD is to write a dxf file. The dxf file is a text file. Autodesk (maker of AutoCAD) publishes the dxf specification here. You will need some basic AutoCAD knowledge (blocks/layers/groups etc.) to understand the spec.