static int FromHex (char c)
{
if (c >= '0' && c <= '9')
return c-'0';
if (c >= 'a' && c <= 'f')
return c-'a'+10;
if (c >= 'A' && c <= 'F')
return c-'A'+10;
Console.WriteLine ("Unexpected `{0}' in hex value for color", c);
return 0;
}
