Mini Paint Application using c#

In this Article, I am going to show you How to create Mini Paint Application using C# Windows Form Application . I am going to show some basic features of Paint Application. Before starting, I Hope you have the Basic Knowledge of GDI+ Graphics Functionality. I have added comments in the Code so that you can easily understand the code.

Let's understand the Mini Paint Application:

using System; using System.Drawing; using System.Windows.Forms; namespace MiniPaint {     public partial class Form1 : Form     {         public Form1()         {             InitializeComponent();             g = pnl_Draw.CreateGraphics();         }         bool startPaint = false;         Graphics g;         //nullable int for storing Null value         int? initX = null;         int? initY = null;         bool drawSquare = false;         bool drawRectangle = false;         bool drawCircle = false;         //Event fired when the mouse pointer is moved over the Panel(pnl_Draw).         private void pnl_Draw_MouseMove(object sender, MouseEventArgs e)         {             if(startPaint)             {                 //Setting the Pen BackColor and line Width                 Pen p = new Pen(btn_PenColor.BackColor,float.Parse(cmb_PenSize.Text));                 //Drawing the line.                 g.DrawLine(p, new Point(initX ?? e.X, initY ?? e.Y), new Point(e.X, e.Y));                 initX = e.X;                 initY = e.Y;             }         }         //Event Fired when the mouse pointer is over Panel and a mouse button is pressed         private void pnl_Draw_MouseDown(object sender, MouseEventArgs e)         {             startPaint = true;             if (drawSquare)             {                 //Use Solid Brush for filling the graphic shapes                 SolidBrush sb = new SolidBrush(btn_PenColor.BackColor);                 //setting the width and height same for creating square.                 //Getting the width and Heigt value from Textbox(txt_ShapeSize)                 g.FillRectangle(sb, e.X, e.Y, int.Parse(txt_ShapeSize.Text), int.Parse(txt_ShapeSize.Text));                 //setting startPaint and drawSquare value to false for creating one graphic on one click.                 startPaint = false;                 drawSquare = false;             }             if(drawRectangle)             {                 SolidBrush sb = new SolidBrush(btn_PenColor.BackColor);                 //setting the width twice of the height                 g.FillRectangle(sb, e.X, e.Y, 2*int.Parse(txt_ShapeSize.Text), int.Parse(txt_ShapeSize.Text));                 startPaint = false;                 drawRectangle = false;             }             if(drawCircle)             {                 SolidBrush sb = new SolidBrush(btn_PenColor.BackColor);                 g.FillEllipse(sb, e.X, e.Y, int.Parse(txt_ShapeSize.Text), int.Parse(txt_ShapeSize.Text));                 startPaint = false;                 drawCircle = false;             }         }         //Fired when the mouse pointer is over the pnl_Draw and a mouse button is released.         private void pnl_Draw_MouseUp(object sender, MouseEventArgs e)         {             startPaint = false;             initX = null;             initY = null;         }         //Button for Setting pen Color         private void button1_Click(object sender, EventArgs e)         {             //Open Color Dialog and Set BackColor of btn_PenColor if user click on OK             ColorDialog c = new ColorDialog();             if(c.ShowDialog()==DialogResult.OK)             {                 btn_PenColor.BackColor = c.Color;             }         }         //New         private void newToolStripMenuItem_Click(object sender, EventArgs e)         {             //Clearing the graphics from the Panel(pnl_Draw)             g.Clear(pnl_Draw.BackColor);             //Setting the BackColor of pnl_draw and btn_CanvasColor to White on Clicking New under File Menu             pnl_Draw.BackColor = Color.White;             btn_CanvasColor.BackColor = Color.White;         }        //Setting the Canvas Color         private void btn_CanvasColor_Click_1(object sender, EventArgs e)         {             ColorDialog c = new ColorDialog();             if(c.ShowDialog()==DialogResult.OK)             {                 pnl_Draw.BackColor = c.Color;                 btn_CanvasColor.BackColor = c.Color;             }         }         private void btn_Square_Click(object sender, EventArgs e)         {             drawSquare = true;         }         private void btn_Rectangle_Click(object sender, EventArgs e)         {             drawRectangle = true;         }         private void btn_Circle_Click(object sender, EventArgs e)         {             drawCircle = true;         }         //Exit under File Menu         private void exitToolStripMenuItem_Click(object sender, EventArgs e)         {             if(MessageBox.Show("Do you want to Exit?","Exit",MessageBoxButtons.YesNo,MessageBoxIcon.Information)==DialogResult.Yes)             {                 Application.Exit();             }         }         //About under Help Menu         private void aboutMiniPaintToolStripMenuItem_Click(object sender, EventArgs e)         {             About a = new About();             a.ShowDialog();         }     } }

Final Preview:

Hope you Like it. Thanks.

[Download Source Code via Google Drive]