Может любой вести, как генерировать изображение из входного текста. Изображение могло бы иметь любое расширение, не имеет значения.
Вот версия Panayiotis ответа Kazar с дополнительными параметрами и документации, подходящей для добавления к классу библиотеки.
/// <summary>
/// Creates an image containing the given text.
/// NOTE: the image should be disposed after use.
/// </summary>
/// <param name="text">Text to draw</param>
/// <param name="fontOptional">Font to use, defaults to Control.DefaultFont</param>
/// <param name="textColorOptional">Text color, defaults to Black</param>
/// <param name="backColorOptional">Background color, defaults to white</param>
/// <param name="minSizeOptional">Minimum image size, defaults the size required to display the text</param>
/// <returns>The image containing the text, which should be disposed after use</returns>
public static Image DrawText(string text, Font fontOptional=null, Color? textColorOptional=null, Color? backColorOptional=null, Size? minSizeOptional=null)
{
Font font = Control.DefaultFont;
if (fontOptional != null)
font = fontOptional;
Color textColor = Color.Black;
if (textColorOptional != null)
textColor = (Color)textColorOptional;
Color backColor = Color.White;
if (backColorOptional != null)
backColor = (Color)backColorOptional;
Size minSize = Size.Empty;
if (minSizeOptional != null)
minSize = (Size)minSizeOptional;
//first, create a dummy bitmap just to get a graphics object
SizeF textSize;
using (Image img = new Bitmap(1, 1))
{
using (Graphics drawing = Graphics.FromImage(img))
{
//measure the string to see how big the image needs to be
textSize = drawing.MeasureString(text, font);
if (!minSize.IsEmpty)
{
textSize.Width = textSize.Width > minSize.Width ? textSize.Width : minSize.Width;
textSize.Height = textSize.Height > minSize.Height ? textSize.Height : minSize.Height;
}
}
}
//create a new image of the right size
Image retImg = new Bitmap((int)textSize.Width, (int)textSize.Height);
using (var drawing = Graphics.FromImage(retImg))
{
//paint the background
drawing.Clear(backColor);
//create a brush for the text
using (Brush textBrush = new SolidBrush(textColor))
{
drawing.DrawString(text, font, textBrush, 0, 0);
drawing.Save();
}
}
return retImg;
}