Draw Square : Rectangle : Graphics C# Source Code

    

/*
User Interfaces in C#: Windows Forms and Custom Controls
by Matthew MacDonald

Publisher: Apress
ISBN: 1590590457
*/

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;

namespace GDI_Basics
{
    /// <summary>
    /// Summary description for DrawSquare.
    /// </summary>
    public class DrawSquare : System.Windows.Forms.Form
    {
        internal System.Windows.Forms.StatusBar StatusBar1;
        internal System.Windows.Forms.StatusBarPanel pnlSquares;
        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ComponentModel.Container components = null;

        public DrawSquare()
        {
            //
            // Required for Windows Form Designer support
            //
            InitializeComponent();

            //
            // TODO: Add any constructor code after InitializeComponent call
            //
        }

        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        protected override void Dispose( bool disposing )
        {
            if( disposing )
            {
                if(components != null)
                {
                    components.Dispose();
                }
            }
            base.Dispose( disposing );
        }

        #region Windows Form Designer generated code
        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            this.StatusBar1 = new System.Windows.Forms.StatusBar();
            this.pnlSquares = new System.Windows.Forms.StatusBarPanel();
            ((System.ComponentModel.ISupportInitialize)(this.pnlSquares)).BeginInit();
            this.SuspendLayout();
            // 
            // StatusBar1
            // 
            this.StatusBar1.Location = new System.Drawing.Point(0, 244);
            this.StatusBar1.Name = "StatusBar1";
            this.StatusBar1.Panels.AddRange(new System.Windows.Forms.StatusBarPanel[] {
                                                                                          this.pnlSquares});
            this.StatusBar1.ShowPanels = true;
            this.StatusBar1.Size = new System.Drawing.Size(292, 22);
            this.StatusBar1.SizingGrip = false;
            this.StatusBar1.TabIndex = 1;
            this.StatusBar1.Text = "statusBar1";
            // 
            // pnlSquares
            // 
            this.pnlSquares.AutoSize = System.Windows.Forms.StatusBarPanelAutoSize.Spring;
            this.pnlSquares.Width = 292;
            // 
            // DrawSquare
            // 
            this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
            this.ClientSize = new System.Drawing.Size(292, 266);
            this.Controls.AddRange(new System.Windows.Forms.Control[] {
                                                                          this.StatusBar1});
            this.Name = "DrawSquare";
            this.Text = "DrawSquare";
            this.MouseDown += new System.Windows.Forms.MouseEventHandler(this.DrawSquare_MouseDown);
            this.Paint += new System.Windows.Forms.PaintEventHandler(this.DrawSquare_Paint);
            ((System.ComponentModel.ISupportInitialize)(this.pnlSquares)).EndInit();
            this.ResumeLayout(false);

        }
        #endregion


        // Store the squares that are painted on the form.
        ArrayList squares = new ArrayList();

        private void DrawSquare_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                // Add a square and update the screen.
                Rectangle square = new Rectangle(e.X, e.Y, 20, 20);
                squares.Add(square);
                this.Invalidate(square);
            }
            else if (e.Button == MouseButtons.Right)
            {
                // Search  for the clicked square.
                int squareNumber = 0;
                foreach (Rectangle square in squares)
                {
                    squareNumber++;
                    if (square.Contains(e.X, e.Y))
                    {
                        MessageBox.Show("Point inside square #" +
                            squareNumber.ToString());
                    }
                }
            }

        }

        private void DrawSquare_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
        {
            Pen drawingPen = new Pen(Color.Red, 10);
            foreach (Rectangle square in squares)
            {
                e.Graphics.DrawRectangle(drawingPen, square);
            }

            pnlSquares.Text = " " + squares.Count.ToString() + " squares";

        }


        [STAThread]
        static void Main() 
        {
            Application.Run(new DrawSquare());
        }
    }
}