Draw a line for the ascent, descent, baseline, textOrigin : Font Unit Metrics « 2D Graphics « C# / C Sharp






Draw a line for the ascent, descent, baseline, textOrigin

Draw a line for the ascent, descent, baseline, textOrigin

  using System;
  using System.Drawing;
  using System.Drawing.Drawing2D;
  using System.Collections;
  using System.ComponentModel;
  using System.Windows.Forms;
  using System.Data;
  using System.Drawing.Imaging;

  public class Form1 : System.Windows.Forms.Form
  {
    public Form1()
    {
      InitializeComponent();
    }
    private void InitializeComponent()
    {
      this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
      this.ClientSize = new System.Drawing.Size(292, 273);
      this.Text = "";
      this.Resize += new System.EventHandler(this.Form1_Resize);
      this.Paint += new System.Windows.Forms.PaintEventHandler(this.Form1_Paint);

    }
    static void Main() 
    {
      Application.Run(new Form1());
    }

    private void Form1_Paint(object sender, System.Windows.Forms.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);

      // Get the design unit metrics from the font family
      int emSizeInDU = ff.GetEmHeight(FontStyle.Regular);
      int ascentInDU = ff.GetCellAscent(FontStyle.Regular);
      int descentInDU = ff.GetCellDescent(FontStyle.Regular);
      int lineSpacingInDU = ff.GetLineSpacing(FontStyle.Regular);

      // Calculate the GraphicsUnit metrics from the font
      float ascentInGU = ascentInDU * (emSizeInGU / emSizeInDU);
      float descentInGU = descentInDU * (emSizeInGU / emSizeInDU);
      float lineSpacingInGU = lineSpacingInDU * (emSizeInGU / emSizeInDU);

      // Draw two lines of the text string
      PointF textOrigin = new PointF(20, 20);
      PointF nextLineOrigin = new PointF(textOrigin.X,
                         textOrigin.Y + f.Height);

      g.DrawString("WWW.JAVA2S.COM", f, Brushes.Black, textOrigin);
      g.DrawString("www.java2s.com", f, Brushes.Black, nextLineOrigin);

      // Draw a line at the textOrigin
      int lineLen = 300;
      g.DrawLine(Pens.Blue, textOrigin, new PointF(textOrigin.X + lineLen, textOrigin.Y));
      g.DrawLine(Pens.Red, nextLineOrigin, new PointF(nextLineOrigin.X + lineLen, nextLineOrigin.Y));

      // Draw a line at the baseline
      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));

      // Draw a line at the top of the ascent
      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));

      // Draw a line at the bottom of the descent
      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));


    }

    private void Form1_Resize(object sender, System.EventArgs e)
    {
      Invalidate();
    }
  }


           
       








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