public static void DrawRtfText(this Graphics graphics, string text, string emphasis, Font f, Font bf, Rectangle layoutArea)
{
RichTextBoxDrawer rtfDrawer = new RichTextBoxDrawer();
rtfDrawer.Multiline = true;
if (Regex.IsMatch(text, emphasis, RegexOptions.IgnoreCase & RegexOptions.CultureInvariant))
{
text = Regex.Replace(text, emphasis, "%", RegexOptions.IgnoreCase & RegexOptions.CultureInvariant);
var parts = text.Split('%');
rtfDrawer.AppendText(parts[0], f);
rtfDrawer.AppendText(emphasis, bf);
rtfDrawer.AppendText(parts[1], f);
}
else
{
rtfDrawer.AppendText(text, f);
}
rtfDrawer.Draw(graphics, layoutArea);
}
private static void AppendText(this RichTextBoxDrawer box, string text, Font font)
{
int ss = box.TextLength;
box.AppendText(text);
box.SelectionStart = ss;
box.SelectionLength = text.Length;
box.SelectionFont = font;
if (!font.Bold)
{
box.SelectionColor = Color.DimGray;
}
else
{
box.SelectionColor = Color.Black;
}
}