Draw font cell ascent, cell descent, line space, em height : Font : Graphics C# Source Code

    
 
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

public class Form1 : Form {

    protected override void OnPaint(PaintEventArgs e) {
    Graphics g = e.Graphics;
    g.FillRectangle(Brushes.White, this.ClientRectangle);
    FontFamily ff = new FontFamily("Times New Roman");
    float emSizeInGU = 24f;
      Font f = new Font(ff, emSizeInGU);

    int emSizeInDU = ff.GetEmHeight(FontStyle.Regular);
    int ascentInDU = ff.GetCellAscent(FontStyle.Regular);
    int descentInDU = ff.GetCellDescent(FontStyle.Regular);
    int lineSpacingInDU = ff.GetLineSpacing(FontStyle.Regular);

    float ascentInGU = ascentInDU * (emSizeInGU / emSizeInDU);
    float descentInGU = descentInDU * (emSizeInGU / emSizeInDU);
    float lineSpacingInGU = lineSpacingInDU * (emSizeInGU / emSizeInDU);

    PointF textOrigin = new PointF(20, 20);
    PointF nextLineOrigin = new PointF(textOrigin.X,textOrigin.Y + f.Height);
    g.DrawString("AxgQ", f, Brushes.Black, textOrigin);
    g.DrawString("AxgQ", f, Brushes.Black, nextLineOrigin);

    int lineLen = 100;
    g.DrawLine(Pens.Blue,textOrigin,new PointF(textOrigin.X + lineLen, textOrigin.Y));
    g.DrawLine(Pens.Red,nextLineOrigin,new PointF(nextLineOrigin.X + lineLen, nextLineOrigin.Y));

    PointF p = new PointF(textOrigin.X,textOrigin.Y + lineSpacingInGU);
    g.DrawLine(Pens.Blue, p,new PointF(p.X + lineLen, p.Y));

    p = new PointF(nextLineOrigin.X,nextLineOrigin.Y + lineSpacingInGU);
    g.DrawLine(Pens.Red, p,new PointF(p.X + lineLen, p.Y));

    p = new PointF(textOrigin.X,textOrigin.Y + lineSpacingInGU - ascentInGU);
    g.DrawLine(Pens.Blue, p,new PointF(p.X + lineLen, p.Y));

    p = new PointF(nextLineOrigin.X, nextLineOrigin.Y +lineSpacingInGU - ascentInGU);
    g.DrawLine(Pens.Red, p, new PointF(p.X + lineLen, p.Y));

    p = new PointF(textOrigin.X,textOrigin.Y + lineSpacingInGU + descentInGU);
    g.DrawLine(Pens.Blue, p,new PointF(p.X + lineLen, p.Y));

    p = new PointF(nextLineOrigin.X,nextLineOrigin.Y + lineSpacingInGU + descentInGU);
    g.DrawLine(Pens.Red, p,new PointF(p.X + lineLen, p.Y));
    }
    public static void Main() {
        Application.Run(new Form1());
    }
}