Draw Signature On Mobile Computer Screen (Portable Terminal Device) C#
Fig 1 : Design Screen of Smart Device Application
Write the following code in the application
Name Spaces
  1. using System;
  2. using System.Linq;
  3. using System.Collections.Generic;
  4. using System.ComponentModel;
  5. using System.Data;
  6. using System.Drawing;
  7. using System.Text;
  8. using System.Windows.Forms;
  9. using System.IO;
  10. using System.Reflection;
  11. using System.Drawing.Imaging;
  12. using System.Collections;
  13. using System.Runtime.InteropServices;
In Partial Class
  1. public partial class Form2 : Form
  2. {
  3. string Img;
  6. private string AppPath = Path.GetDirectoryName(Assembly.GetExecutingAssembly().GetName().CodeBase);
  7. private Signature cSignature;
  8. private Point? _Previous = null;
  9. private Pen _Pen = new Pen(Color.Black);
Create Events of PictureBox
  1. private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
  2. {
  3. _Previous = new Point(e.X, e.Y);
  4. pictureBox1_MouseMove(sender, e);
  5. }
  7. private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
  8. {
  9. if (_Previous != null)
  10. {
  11. if (pictureBox1.Image == null)
  12. {
  13. Bitmap bmp = new Bitmap(pictureBox1.Width, pictureBox1.Height);
  14. using (Graphics g = Graphics.FromImage(bmp))
  15. {
  16. g.Clear(Color.White);
  17. }
  18. pictureBox1.Image = bmp;
  19. }
  20. using (Graphics g = Graphics.FromImage(pictureBox1.Image))
  21. {
  22. g.DrawLine(_Pen, _Previous.Value.X, _Previous.Value.Y, e.X, e.Y);
  23. }
  24. pictureBox1.Invalidate();
  25. _Previous = new Point(e.X, e.Y);
  26. }
  27. }
  29. private void pictureBox1_MouseUp(object sender, MouseEventArgs e)
  30. {
  31. _Previous = null;
  32. }
Clear Button Click Event :
  1. private void btnClear_Click_1(object sender, EventArgs e)
  2. {
  3. pictureBox1.Image = null;
  4. }
Lets see the output below :
Its Done

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