Csharp/C Sharp/Components/Clock

A Clock

/*
Code revised from chapter 4

GDI+ Custom Controls with Visual C# 2005
By Iulian Serban, Dragos Brezoi, Tiberiu Radu, Adam Ward 
Language English
Paperback 272 pages [191mm x 235mm]
Release date July 2006
ISBN 1904811604
Sample chapter
http://www.packtpub.ru/files/1604_CustomControls_SampleChapter.pdf

For More info on GDI+ Custom Control with Microsoft Visual C# book 
visit website www.packtpub.ru 

*/ 
using System;
using System.Collections.Generic;
using System.ruponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Drawing.Drawing2D;
namespace ClockTest00
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private System.ruponentModel.IContainer components = null;
        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (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.clock1 = new ClockTest00.Clock();
            this.SuspendLayout();
            // 
            // clock1
            // 
            this.clock1.BackColor = System.Drawing.SystemColors.ControlLightLight;
            this.clock1.HourColor = System.Drawing.Color.Black;
            this.clock1.Location = new System.Drawing.Point(67, 49);
            this.clock1.MinuteColor = System.Drawing.Color.Black;
            this.clock1.Name = "clock1";
            this.clock1.SecondColor = System.Drawing.Color.Black;
            this.clock1.Size = new System.Drawing.Size(150, 150);
            this.clock1.TabIndex = 0;
            // 
            // Form1
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(292, 266);
            this.Controls.Add(this.clock1);
            this.Name = "Form1";
            this.Text = "Form1";
            this.ResumeLayout(false);
        }
        #endregion
        private Clock clock1;

        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new Form1());
        }
        
    }
    public partial class Clock : UserControl
    {
        public Clock()
        {
            //Sets the rendering mode of the control to double buffer to stop flickering
            this.SetStyle(ControlStyles.OptimizedDoubleBuffer, true);
            InitializeComponent();
            //Enables the timer so the clock refreshes every second
            timer.Enabled = true;
            MakeRound();
        }
        private Color hourColor = Color.Black;
        private Color minuteColor = Color.Black;
        private Color secondColor = Color.Black;
        public Color HourColor
        {
            get
            {
                return hourColor;
            }
            set
            {
                if (hourColor != value)
                {
                    hourColor = value;
                    Invalidate();
                }
            }
        }
        public Color MinuteColor
        {
            get
            {
                return minuteColor;
            }
            set
            {
                if (minuteColor != value)
                {
                    minuteColor = value;
                    Invalidate();
                }
            }
        }
        public Color SecondColor
        {
            get
            {
                return secondColor;
            }
            set
            {
                if (secondColor != value)
                {
                    secondColor = value;
                    Invalidate();
                }
            }
        }

        protected override void OnPaint(PaintEventArgs e)
        {
            base.OnPaint(e);
            //Smooths out the appearance of the control
            e.Graphics.SmoothingMode = SmoothingMode.AntiAlias;
            //The center of the control, that is used as center for the clock
            PointF center = new PointF(this.Width / 2, this.Height / 2);
            //The distace of the text from the center
            float textRadius = (Math.Min(Width, Height) - Font.Height) / 2;
            //The distance of the margin points from the center
            float outerRadius = Math.Min(Width, Height) / 2 - Font.Height;
            //The length of the hour line
            float hourRadius = outerRadius * 6 / 9;
            //The length of the minute line
            float minuteRadius = outerRadius * 7 / 9;
            //The length of the second line
            float secondRadius = outerRadius * 8 / 9;
            for (int i = 1; i <= 60; i++)
            {
                //Gets the angle of the outer dot
                float angle = GetAngle(i / 5f, 12);
                //Gets the location of the outer dot
                PointF dotPoint = GetPoint(center, outerRadius, angle);
                //Indicates the size of the point
                int pointSize = 2;
                //Is true when a large dot needs to be rendered
                if (i % 5 == 0)
                {
                    //Sets the size of the point to make it bigger
                    pointSize = 4;
                    //The hour number
                    string text = (i / 5).ToString();
                    SizeF sz = e.Graphics.MeasureString(text, Font);
                    //The point where the text should be rendered
                    PointF textPoint = GetPoint(center, textRadius, angle);
                    //Offsets the text location so it is centered in that point.
                    textPoint.X -= sz.Width / 2;
                    textPoint.Y -= sz.Height / 2;
                    //Draws the hour number
                    e.Graphics.DrawString(text, Font, new SolidBrush(this.ForeColor), textPoint);
                }
                Pen pen = new Pen(new SolidBrush(this.ForeColor), 1);
                //Draws the outer dot of the clock
                e.Graphics.DrawEllipse(pen, dotPoint.X - pointSize / 2, dotPoint.Y - pointSize / 2, pointSize, pointSize);
                pen.Dispose();
            }
            //Gets the system time
            DateTime dt = DateTime.Now;
            //Calculates the hour offset from the large outer dot
            float min = ((float)dt.Minute) / 60;
            //Calculates the angle of the hour line
            float hourAngle = GetAngle(dt.Hour + min, 12);
            //Calculates the angle of the minute line
            float minuteAngle = GetAngle(dt.Minute, 60);
            //Calculates the angle of the second line
            float secondAngle = GetAngle(dt.Second, 60);
            //Draws the clock lines
            DrawLine(e.Graphics, this.secondColor, 1, center, secondRadius, secondAngle);
            DrawLine(e.Graphics, this.minuteColor, 2, center, minuteRadius, minuteAngle);
            DrawLine(e.Graphics, this.hourColor, 3, center, hourRadius, hourAngle);
            e.Graphics.ResetTransform();
        }
        private PointF GetPoint(PointF center, float radius, float angle)
        {
            //Calculates the X coordinate of the point
            float x = (float)Math.Cos(2 * Math.PI * angle / 360) * radius + center.X;
            //Calculates the Y coordinate of the point
            float y = -(float)Math.Sin(2 * Math.PI * angle / 360) * radius + center.Y;
            return new PointF(x, y);
        }
        private void DrawLine(Graphics g, Color color, int penWidth, PointF center, float radius, float angle)
        {
            //Calculates the end point of the line
            PointF endPoint = GetPoint(center, radius, angle);
            //Creates the pen used to render the line
            Pen pen = new Pen(new SolidBrush(color), penWidth);
            //Renders the line
            g.DrawLine(pen, center, endPoint);
            pen.Dispose();
        }
        private void MakeRound()
        {
            GraphicsPath gp = new GraphicsPath();
            float min = Math.Min(Width, Height);
            //Creates the ellipse shape
            gp.AddEllipse((Width - min) / 2, (Height - min) / 2, min, min);
            //Creates the ellipse region
            Region rgn = new Region(gp);
            //Sets the ellipse region to the control
            this.Region = rgn;
        }
        private float GetAngle(float clockValue, float divisions)
        {
            //Calculates the angle
            return 360 - (360 * (clockValue) / divisions) + 90;
        }

        private void timer_Tick(object sender, EventArgs e)
        {
            Invalidate();
        }
        private void Clock_SizeChanged(object sender, EventArgs e)
        {
            MakeRound();
            Invalidate();
        }
        private void Clock_Paint(object sender, PaintEventArgs e)
        {
        }
        private System.ruponentModel.IContainer components = null;
        /// <summary> 
        /// Clean up any resources being used.
        /// </summary>
        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }
        #region Component 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.ruponents = new System.ruponentModel.Container();
            this.timer = new System.Windows.Forms.Timer(this.ruponents);
            this.SuspendLayout();
            // 
            // timer
            // 
            this.timer.Interval = 1000;
            this.timer.Tick += new System.EventHandler(this.timer_Tick);
            // 
            // Clock
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.Name = "Clock";
            this.Paint += new System.Windows.Forms.PaintEventHandler(this.Clock_Paint);
            this.SizeChanged += new System.EventHandler(this.Clock_SizeChanged);
            this.ResumeLayout(false);
        }
        #endregion
        private System.Windows.Forms.Timer timer;
        
    }
    
}