DavidG

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


namespace mePaint
{
    public partial class Form1 : Form
    {


        bool paint = false;

        SolidBrush color;

        bool fillActivated = false;
        bool ellipseActivated = true;
        bool rectangleActivated = false;

        bool colorDialogHasBeenUsed = false;

        Color colorSet = Color.Black;

        public Form1()
        {
            InitializeComponent();
            this.WindowState = FormWindowState.Maximized;
            color = new SolidBrush(Color.Black);
            this.button3.Image = new Bitmap(button2.Image);
        }
        private void panel1_MouseUp(object sender, MouseEventArgs e)
        {
            paint = false;
            if (colorDialogHasBeenUsed)
            {
                color = new SolidBrush(colorSet);
            }
            else
            {
                color = new SolidBrush(Color.Black);
            }
        }

        private void panel1_MouseMove(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Right)
            {
                color = new SolidBrush(Color.White);
            }
            if (paint)
            {
                if (ellipseActivated)
                {
                    Graphics g = panel1.CreateGraphics();
                    g.FillEllipse(color, e.X, e.Y, Convert.ToInt32(numericUpDown1.Value), Convert.ToInt32(numericUpDown1.Value));
                }
                else if (rectangleActivated)
                {
                    Graphics g = panel1.CreateGraphics();
                    g.FillRectangle(color, e.X, e.Y, Convert.ToInt32(numericUpDown1.Value), Convert.ToInt32(numericUpDown1.Value));
                }
            }
        }

        private void panel1_MouseDown(object sender, MouseEventArgs e)
        {
            paint = true;
            if (fillActivated)
                {
                    Graphics g = panel1.CreateGraphics();
                    g.FillRectangle(color, 0,0,this.panel1.Width,this.panel1.Height);
                }
        }

        private void button1_Click(object sender, EventArgs e)
        {
            ColorDialog colorDlg = new ColorDialog();
            colorDlg.AllowFullOpen = true; ;
            colorDlg.AnyColor = true;
            colorDlg.SolidColorOnly = false;

            if (colorDlg.ShowDialog() == DialogResult.OK)
            {
                color = new SolidBrush(colorDlg.Color);
                colorDialogHasBeenUsed = true;
                colorSet = colorDlg.Color;
            }
        }

        private void button2_Click(object sender, EventArgs e)
        {
            if (ellipseActivated)
            {
                ellipseActivated = false;
                this.button3.Image = new Bitmap(button4.Image);
            }
            else
            {
                ellipseActivated = true;
                this.button3.Image = new Bitmap(button2.Image);
                fillActivated = false;
                rectangleActivated = false;
            }
        }

        private void newToolStripMenuItem_Click(object sender, EventArgs e)
        {
            Form1 form1 = new Form1();
            form1.Show();
        }

        private void clearToolStripMenuItem1_Click(object sender, EventArgs e)
        {
            Graphics g1 = panel1.CreateGraphics();
            g1.Clear(panel1.BackColor);
        }

        private void button5_Click(object sender, EventArgs e)
        {
            if (rectangleActivated)
            {
                rectangleActivated = false;
                this.button3.Image = new Bitmap(button4.Image);
            }
            else
            {
                rectangleActivated = true;
                this.button3.Image = new Bitmap(button5.Image);
                fillActivated = false;
                ellipseActivated = false;
            }
        }

        private void paintAreaSizeToolStripMenuItem_Click(object sender, EventArgs e)
        {
            DefinePanelSize panelForm = new DefinePanelSize();
            panelForm.ShowDialog();
        }

        private void button6_Click(object sender, EventArgs e)
        {
            if (fillActivated)
            {
                fillActivated = false;
                this.button3.Image = new Bitmap(button4.Image);
            }
            else
            {
                fillActivated = true;
                this.button3.Image = new Bitmap(button6.Image);
                rectangleActivated = false;
                ellipseActivated = false;
            }
        }

        private void closeToolStripMenuItem_Click_1(object sender, EventArgs e)
        {
            this.Close();
        }

        private void saveToolStripMenuItem_Click_1(object sender, EventArgs e)
        {
            SaveFileDialog saveFileDialog = new SaveFileDialog();

            saveFileDialog.DefaultExt = "bmp";
            saveFileDialog.Filter = "Bitmap files|*.bmp";
            if (saveFileDialog.ShowDialog() == DialogResult.OK)
            {
                int width = panel1.Width;
                int height = panel1.Height;

                Bitmap bitMap = new Bitmap(width, height);
                Rectangle rec = new Rectangle(0, 0, width, height);

                panel1.DrawToBitmap(bitMap, rec);

                bitMap.Save(saveFileDialog.FileName);
            }
        }
    }
}