How to create a simple Radar in CSharp using Visual Studio

In this project we will be creating a simple Radar screen in CSharp using Visual Studio. At the end of this project we will have an application mimic a radar screen. You are encouraged to experiment with the code and change the look and design as per your imagination.

Variables

Following variables are used in this project to create the simple radar.

Form1.cs

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

namespace SimpleRadar
{
    public partial class Form1 : Form
    {
        Timer t = new Timer();

        int WIDTH = 300, HEIGHT = 300, HAND = 150;

        int u;  //in degree
        int cx, cy;     //center of the circle
        int x, y;       //HAND coordinate

        int tx, ty, lim = 20;

        Bitmap bmp;
        Pen p;
        Graphics g;

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            //create Bitmap
            bmp = new Bitmap(WIDTH + 1, HEIGHT + 1);

            //background color
            this.BackColor = Color.Black;

            //center
            cx = WIDTH / 2;
            cy = HEIGHT / 2;

            //initial degree of HAND
            u = 0;

            //timer
            t.Interval = 5; //in millisecond
            t.Tick += new EventHandler(this.t_Tick);
            t.Start();
        }

        private void t_Tick(object sender, EventArgs e)
        {
            //pen
            p = new Pen(Color.Green, 1f);

            //graphics
            g = Graphics.FromImage(bmp);

            //calculate x, y coordinate of HAND
            int tu = (u - lim) % 360;

            if (u >= 0 && u <= 180)
            {
                //right half
                //u in degree is converted into radian.

                x = cx + (int)(HAND * Math.Sin(Math.PI * u / 180));
                y = cy - (int)(HAND * Math.Cos(Math.PI * u / 180));
            }
            else
            {
                x = cx - (int)(HAND * -Math.Sin(Math.PI * u / 180));
                y = cy - (int)(HAND * Math.Cos(Math.PI * u / 180));
            }

            if (tu >= 0 && tu <= 180)
            {
                //right half
                //tu in degree is converted into radian.

                tx = cx + (int)(HAND * Math.Sin(Math.PI * tu / 180));
                ty = cy - (int)(HAND * Math.Cos(Math.PI * tu / 180));
            }
            else
            {
                tx = cx - (int)(HAND * -Math.Sin(Math.PI * tu / 180));
                ty = cy - (int)(HAND * Math.Cos(Math.PI * tu / 180));
            }

            //draw circle
            g.DrawEllipse(p, 0, 0, WIDTH, HEIGHT);  //bigger circle
            g.DrawEllipse(p, 80, 80, WIDTH - 160, HEIGHT - 160);    //smaller circle

            //draw perpendicular line
            g.DrawLine(p, new Point(cx, 0), new Point(cx, HEIGHT)); // UP-DOWN
            g.DrawLine(p, new Point(0, cy), new Point(WIDTH, cy)); //LEFT-RIGHT

            //draw HAND
            g.DrawLine(new Pen(Color.Black, 1f), new Point(cx, cy), new Point(tx, ty));
            g.DrawLine(p, new Point(cx, cy), new Point(x, y));

            //load bitmap in picturebox1
            pictureBox1.Image = bmp;

            //dispose
            p.Dispose();
            g.Dispose();

            //update
            u++;
            if (u == 360)
            {
                u = 0;
            }
        }
    }
}

Form1.Designer.cs

namespace SimpleRadar
{
    partial class Form1
    {
        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ComponentModel.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.pictureBox1 = new System.Windows.Forms.PictureBox();
            ((System.ComponentModel.ISupportInitialize)(this.pictureBox1)).BeginInit();
            this.SuspendLayout();
            // 
            // pictureBox1
            // 
            this.pictureBox1.Dock = System.Windows.Forms.DockStyle.Fill;
            this.pictureBox1.Location = new System.Drawing.Point(0, 0);
            this.pictureBox1.Name = "pictureBox1";
            this.pictureBox1.Size = new System.Drawing.Size(386, 325);
            this.pictureBox1.SizeMode = System.Windows.Forms.PictureBoxSizeMode.Zoom;
            this.pictureBox1.TabIndex = 0;
            this.pictureBox1.TabStop = false;
            // 
            // Form1
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(386, 325);
            this.Controls.Add(this.pictureBox1);
            this.Name = "Form1";
            this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
            this.Text = "RADAR";
            this.Load += new System.EventHandler(this.Form1_Load);
            ((System.ComponentModel.ISupportInitialize)(this.pictureBox1)).EndInit();
            this.ResumeLayout(false);

        }

        #endregion

        private System.Windows.Forms.PictureBox pictureBox1;
    }
}