stamp.cs

public class SignatureStamp {
  public static byte[] Create(
     Size size,
     string name,
     float fontSize,
     string signatureSVG,
     string documentID = "",
     Color? color = null,
     Color? highlightColor = null,
     int offsetX = 70,
     int offsetY = 20,
     int highlights = 10) {

     // default colors
     color = color ?? Color.LightGray;
     highlightColor = highlightColor ?? Color.Blue;

     // write svg header
     string sSvgImage = "<?xml version=\"1.0\" encoding=\"utf-8\"?><svg version=\"1.1\" xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" x=\"0px\" y=\"0px\" viewBox=\"0 0 " + size.Width.ToString() + " " + size.Height.ToString() + "\" xml:space=\"preserve\">";

     int countOffsetX = -offsetX;
     int countOffsetY = 0;
     int countX = 0;
     int countY = 0;

     // generate 
     int[][] positions = CreateRandomPositions(size, offsetX, countOffsetY, offsetY, 10);

     // loop through all rows
     do {

        string textColor;

        // loop through all columns
        do {

           // change highlight color based on random positions
           if (Array.Exists(positions, element => (element[0] == countX) && (element[1] == countY)))
              textColor = HexConverter(highlightColor);
           else
              textColor = HexConverter(color);

           // render the text
           sSvgImage += "<g><text style=\"font-size: " + fontSize.ToString() + "px; font-family: Arial; fill: " + textColor + ";\" transform=\"matrix(1 -0.17 0.17 1 " + countOffsetX.ToString() + " " + countOffsetY.ToString() + ")\">" + name + "</text><text style=\"font-size: " + fontSize.ToString() + "px; font-family: Arial; fill: " + textColor + ";\" transform=\"matrix(1 -0.17 0.17 1 " + (countOffsetX + 30).ToString() + " " + (countOffsetY + 0.4).ToString() + ")\">" + name + "</text></g>";

           // increase offset
           countOffsetX += offsetX;
           countX++;

        } while (countOffsetX < size.Width + offsetX);

        countOffsetY += offsetY;
        countOffsetX = -offsetX;

        countY++; countX = 0;

     } while (countOffsetY < size.Height + offsetY);

     // do all required calculations in Signature object
     var signature = new Signature(signatureSVG, size);

     // center the signature in stamp
     var posX = (size.Width - (signature.Size.Width * signature.ScalingFactor)) / 2;
     var posY = (size.Height - (signature.Size.Height * signature.ScalingFactor)) / 2;

     sSvgImage += "<g transform=\"scale(" + signature.ScalingFactor + ") translate(" + posX + " " + posY + ")\">";

     // render the signature
     sSvgImage += signatureSVG;
     sSvgImage += "</g>";

     // adding document ID
     sSvgImage += "<g transform=\"translate(10 20)\"><text style=\"font-family: Arial; fill: #000;\">Document ID: " + documentID + "</text></g>";

     // close the SVG
     sSvgImage += "</svg>";

     // return the SVG as a byte array
     return Encoding.ASCII.GetBytes(sSvgImage);
  }
}