CADSoftTools

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public enum CADAxis
{
    OX,
    OY,
    OZ,
}

public static float Mod(double AValue, double ABase)
{
    return (float)(AValue - (Int64)(Math.Truncate(AValue / ABase)) * ABase);
}

public static void MirrorEntityInAxis(CADImage cadImage, CADEntity entity, CADAxis axis)
{
    CADMatrix m = new CADMatrix();
    m.IdentityMat();
    DPoint vector = DPoint.One;
    double angle = 0;

    switch (axis)
    {
        case CADAxis.OX:
            vector = new DPoint(1, -1, 1);
            angle = 180;
            break;
        case CADAxis.OY:
            vector = new DPoint(-1, 1, 1);
            break;
    }
    m = m.Scale(vector);

    switch (entity.EntType)
    {
        case EntityType.Line:
            CADLine line = entity as CADLine;
            line.Point = DPoint.XMat(line.Point, m);
            line.Point1 = DPoint.XMat(line.Point1, m);
            cadImage.Converter.Loads(line);
            break;
        case EntityType.LWPolyline:
            CADLWPolyLine lwPolyline = entity as CADLWPolyLine;
            lwPolyline.Vertexes.ForEach(vertex => (vertex as CADVertex).Point = (vertex as CADVertex).Point.XMat(m));               
            cadImage.Converter.Loads(lwPolyline);
            break;
        case EntityType.Circle:
            CADCircle circle = entity as CADCircle;
            circle.Point = DPoint.XMat(circle.Point, m);
            cadImage.Converter.Loads(circle);
            break;
        case EntityType.Arc:
            CADArc arc = entity as CADArc;
            arc.Point = DPoint.XMat(arc.Point, m);
            cadImage.Converter.Loads(arc);
            arc.Extrusion = new DPoint(arc.Extrusion.X, arc.Extrusion.Y, -arc.Extrusion.Z);
            arc.StartAngle = arc.StartAngle + angle;
            arc.EndAngle = arc.EndAngle + angle;
            cadImage.Converter.Loads(arc);
            break;
        case EntityType.Spline:
            CADSpline spline = entity as CADSpline;
            if (spline.FitCount > 0)
            {
                for (int i = 0; i < spline.FitCount; i++)
                    spline.Fit[i] = DPoint.XMat(spline.Fit[i], m);
            }
            else
            {
                for (int i = 0; i < spline.ControlCount; i++)
                    spline.Controls[i] = DPoint.XMat(spline.Controls[i], m);
            }
            cadImage.Converter.Loads(spline);
            break;
        case EntityType.Insert:
            CADInsert insert = entity as CADInsert;
            insert.Point = DPoint.XMat(insert.Point, m);
            insert.Angle = Mod(-insert.Angle - 180, 360);
            if (axis == CADAxis.OX)
                insert.Scale = new DPoint(-insert.Scale.X, insert.Scale.Y, insert.Scale.Z);
            if (axis == CADAxis.OY)
                insert.Scale = new DPoint(insert.Scale.X, -insert.Scale.Y, insert.Scale.Z);
            cadImage.Converter.Loads(insert);
            break;
    }
}

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cadImage2.CurrentLayout.Entities.ForEach(entity => MirrorEntityInAxis(cadImage2, entity, CADAxis.OX));

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public void Draw(Graphics gr, RectangleF Rect);
public void Draw(Graphics gr, RectangleF Rect, System.Windows.Forms.Control control);

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var arq = @"1101.dxf";          
var arq2 = @"1101_virou.dxf";
var cadImage2 = CADImage.CreateImageByExtension(arq);
cadImage2.LoadFromFile(arq);

Bitmap bitmap = new Bitmap((int)cadImage2.PureExtents.Width, (int)cadImage2.PureExtents.Height);
cadImage2.Draw(Graphics.FromImage(bitmap), new RectangleF(0, 0, (int)cadImage2.PureExtents.Width, (int)cadImage2.PureExtents.Height));

cadImage2.CurrentLayout.Entities.ForEach(entity => MirrorEntityInAxis(cadImage2, entity, CADAxis.OX));