ICODEBROKER

using System;

using System.Drawing;

using System.Windows.Forms;

namespace TestProject

{

    /// <summary>

    /// 메인 폼

    /// </summary>

    public partial class MainForm : Form

    {

        //////////////////////////////////////////////////////////////////////////////////////////////////// Field

        ////////////////////////////////////////////////////////////////////////////////////////// Private

        #region Field

        /// <summary>

        /// 원 중심 X 좌표

        /// </summary>

        private int circleCenterX;

        /// <summary>

        /// 원 중심 Y 좌표

        /// </summary>

        private int circleCenterY;

        /// <summary>

        /// 원 반경

        /// </summary>

        private int circleRadius = 100;

        /// <summary>

        /// 타원 중심 X 좌표

        /// </summary>

        private int ellipseCenterX;

        /// <summary>

        /// 타원 중심 Y 좌표

        /// </summary>

        private int ellipseCenterY;

        /// <summary>

        /// 타원 반경 X

        /// </summary>

        private int ellipseRadiusX = 150;

        /// <summary>

        /// 타원 반경 Y

        /// </summary>

        private int ellipseRadiusY = 100;

        /// <summary>

        /// 타원 C 값

        /// </summary>

        private int ellipseC;

        #endregion

        //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor

        ////////////////////////////////////////////////////////////////////////////////////////// Public

        #region 생성자 - MainForm()

        /// <summary>

        /// 생성자

        /// </summary>

        public MainForm()

        {

            InitializeComponent();

            SetStyle(ControlStyles.ResizeRedraw | ControlStyles.UserPaint | ControlStyles.AllPaintingInWmPaint, true);

            UpdateStyles();

            Load += Form_Load;

        }

        #endregion

        //////////////////////////////////////////////////////////////////////////////////////////////////// Method

        ////////////////////////////////////////////////////////////////////////////////////////// Protected

        #region 배경 페인트시 처리하기 - OnPaintBackground(e)

        /// <summary>

        /// 배경 페인트시 처리하기

        /// </summary>

        /// <param name="e">이벤트 인자</param>

        protected override void OnPaintBackground(PaintEventArgs e)

        {

            e.Graphics.Clear(Color.White);

        }

        #endregion

        #region 페인트시 처리하기 - OnPaint(e)

        /// <summary>

        /// 페인트시 처리하기

        /// </summary>

        /// <param name="e">이벤트 인자</param>

        protected override void OnPaint(PaintEventArgs e)

        {

            DrawCircle(e.Graphics);

        }

        #endregion

        #region 마우스 이동시 처리하기 - OnMouseMove(e)

        /// <summary>

        /// 마우스 이동시 처리하기

        /// </summary>

        /// <param name="e">이벤트 인자</param>

        protected override void OnMouseMove(MouseEventArgs e)

        {

            base.OnMouseMove(e);

            bool circleOver = false;

            {

                int x = Math.Abs(this.circleCenterX - e.X);

                int y = Math.Abs(this.circleCenterY - e.Y);

                if(Math.Sqrt(x * x + y * y) <= this.circleRadius)

                {

                    circleOver = true;

                }

            }

            bool ellipseOver = false;

            {

                int x;

                int y;

                double f1Length;

                double f2Length;

                if(this.ellipseRadiusX > this.ellipseRadiusY)

                {

                    x = Math.Abs((this.ellipseCenterX - this.ellipseC) - e.X);

                    y = Math.Abs(this.ellipseCenterY - e.Y);

                    f1Length = Math.Sqrt(x * x + y * y);

                    x = Math.Abs((this.ellipseCenterX + this.ellipseC) - e.X);

                    f2Length = Math.Sqrt(x * x + y * y);

                    ellipseOver = (f1Length + f2Length) <= (2 * this.ellipseRadiusX);

                }

                else

                {

                    y = Math.Abs((this.ellipseCenterY - this.ellipseC) - e.Y);

                    x = Math.Abs(e.X - this.ellipseCenterX);

                    f1Length = Math.Sqrt(x * x + y * y);

                    y = Math.Abs((this.ellipseCenterY + this.ellipseC) - e.Y);

                    f2Length = Math.Sqrt(x * x + y * y);

                    ellipseOver = (f1Length + f2Length) <= (2 * this.ellipseRadiusY);

                }

            }

            Text = string.Format("타원과 원 내부 마우스 위치 여부 구하기 (원 : {0}, 타원 : {1})", circleOver, ellipseOver);

            Invalidate();

        }

        #endregion

        ////////////////////////////////////////////////////////////////////////////////////////// Private

        //////////////////////////////////////////////////////////////////////////////// Event

        #region 폼 로드시 처리하기 - Form_Load(sender, e)

        /// <summary>

        /// 폼 로드시 처리하기

        /// </summary>

        /// <param name="sender">이벤트 발생자</param>

        /// <param name="e">이벤트 인자</param>

        private void Form_Load(object sender, EventArgs e)

        {

            this.circleCenterX = 150;

            this.circleCenterY = 150;

            this.ellipseCenterX = 300;

            this.ellipseCenterY = 250;

            if(this.ellipseRadiusX > this.ellipseRadiusY)

            {

                this.ellipseC = (int)Math.Sqrt(this.ellipseRadiusX * this.ellipseRadiusX - this.ellipseRadiusY * this.ellipseRadiusY);

            }

            else

            {

                this.ellipseC = (int)Math.Sqrt(this.ellipseRadiusY * this.ellipseRadiusY - this.ellipseRadiusX * this.ellipseRadiusX);

            }

        }

        #endregion

        //////////////////////////////////////////////////////////////////////////////// Function

        #region 원 그리기 - DrawCircle(graphics)

        /// <summary>

        /// 원 그리기

        /// </summary>

        /// <param name="graphics">그래픽스</param>

        private void DrawCircle(Graphics graphics)

        {

            Point mousePoint = PointToClient(Control.MousePosition);

            Rectangle circleRectangle = new Rectangle

            (

                this.circleCenterX - this.circleRadius,

                this.circleCenterY - this.circleRadius,

                this.circleRadius * 2,

                this.circleRadius * 2

            );

            graphics.DrawEllipse(Pens.Blue, circleRectangle);

            graphics.DrawLine(Pens.Violet, mousePoint, new Point(this.circleCenterX, this.circleCenterY));

            Rectangle ellipseRectangle = new Rectangle

            (

                this.ellipseCenterX - this.ellipseRadiusX,

                this.ellipseCenterY - this.ellipseRadiusY,

                this.ellipseRadiusX * 2,

                this.ellipseRadiusY * 2

            );

            graphics.DrawEllipse(Pens.Red, ellipseRectangle);

            Point focalPoint2;

            Point focalPoint1;

            if(this.ellipseRadiusX > this.ellipseRadiusY)

            {

                focalPoint1 = new Point(this.ellipseCenterX - this.ellipseC, this.ellipseCenterY);

                focalPoint2 = new Point(this.ellipseCenterX + this.ellipseC, this.ellipseCenterY);

            }

            else

            {

                focalPoint1 = new Point(this.ellipseCenterX, this.ellipseCenterY - this.ellipseC);

                focalPoint2 = new Point(this.ellipseCenterX, this.ellipseCenterY + this.ellipseC);

            }

            graphics.DrawLine(Pens.Violet, mousePoint, focalPoint1);

            graphics.DrawLine(Pens.Violet, mousePoint, focalPoint2);

        }

        #endregion

    }

}