private void WriteHeader(string filename, StreamWriter eps)
{
eps.WriteLine("%!PS-Adobe-3.0 EPSF-3.0");
eps.WriteLine("%%Creator: Triangle.NET Mesh Explorer");
eps.WriteLine("%%Title: {0}", filename);
eps.WriteLine("%%Pages: 1");
eps.WriteLine("%%BoundingBox: {0} {1} {2} {3}", x_ps_min, y_ps_min, x_ps_max, y_ps_max);
eps.WriteLine("%%Document-Fonts: Times-Roman");
eps.WriteLine("%%LanguageLevel: 1");
eps.WriteLine("%%EndComments");
eps.WriteLine("%%BeginProlog");
eps.WriteLine("/inch {72 mul} def");
eps.WriteLine("%%EndProlog");
eps.WriteLine("%%Page: 1 1");
}