Draw font cell ascent, cell descent, line space, em height
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());
}
}
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