PDFsharp & MigraDoc Foundation

/// <summary>
/// Draws a string withing a given width, splitting the string up into lines if needed
/// </summary>
/// <param name="zGFX">The XGraphics object being drawn to</param>
/// <param name="zX">The X cordinate of the bounding box</param>
/// <param name="zY">The Y cordinate of the bounding box</param>
/// <param name="zWidth">The width of the bounding box (the Height is undefined)</param>
/// <param name="zText">The text to be drawn</param>
/// <param name="zFont">The font to be used</param>
/// <param name="zBrush">The brush to be used</param>
/// <param name="zFormat">The XStringFormat object to be used</param>
/// <returns>An XRect structure that defines the bounding box that was used</returns>
private XRect DrawString(XGraphics zGFX, double zX, double zY, double zWidth, string zText, XFont zFont, XBrush zBrush, XStringFormat zFormat)
{
    if (zWidth <= 0d || zText.Trim() == "") return new XRect(0d, 0d, 0d, 0d);

    // Split the string up into words
    List<string> words = new List<string>(zText.Split(' ').AsEnumerable());

    // Get the width of each of the words
    List<double> words_width = new List<double>();
    for (int i = 0; i < words.Count; i++)
    {
        // If the word is too big truncate it
        if (zGFX.MeasureString(words[i], zFont, zFormat).Width > zWidth)
            while (zGFX.MeasureString(words[i], zFont, zFormat).Width > zWidth)
                words[i].Substring(0, words[i].Length - 1);

        // Add the width
        words_width.Add(zGFX.MeasureString(words[i], zFont, zFormat).Width);
    }

    // List of the lines
    List<string> lines = new List<string>();

    // Holds information on the current line in the for loop below
    double curLineWidth = 0;
    string curLine = "";

    // Holds the width of the largest line
    double returnWidth = 0d;

    // Organize the words into lines that fit into the specified width
    for (int i = 0; i < words.Count; i++)
    {
        // If we've reached the end of the line
        if (words_width[i] + curLineWidth > zWidth)
        {
            // Add the current line to the line list
            lines.Add(curLine.Trim());

            // Check to see if this is the biggest line, if so, store the width
            if (curLineWidth > returnWidth) returnWidth = curLineWidth;

            // Reset the current variables
            curLineWidth = 0;
            curLine = "";
        }

        // Add the word to the current line
        curLine += " " + words[i];

        // Add to the line width
        curLineWidth += words_width[i];
    }

    // Add the last line to the line list
    lines.Add(curLine.Trim());

    // Check to see if this is the biggest line, if so, store the width
    if (curLineWidth > returnWidth) returnWidth = curLineWidth;

    // Get the height of each line
    double lineHeight = zGFX.MeasureString(lines[0], zFont,zFormat).Height;

    // Draw the lines
    for (int i = 0; i < lines.Count; i++)
        zGFX.DrawString(lines[i], zFont, zBrush, new XRect(zX, zY + lineHeight * i, zWidth, lineHeight), zFormat);

    return new XRect(zX, zY, returnWidth, lineHeight * lines.Count);
}