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>

        /// 소스 비트맵

        /// </summary>

        private Bitmap sourceBitmap;

        /// <summary>

        /// 선택 여부

        /// </summary>

        private bool isSelecting = false;

        /// <summary>

        /// 시작 X 좌표

        /// </summary>

        private int xStart;

        /// <summary>

        /// 시작 Y 좌표

        /// </summary>

        private int yStart;

        /// <summary>

        /// 종료 X 좌표

        /// </summary>

        private int xEnd;

        /// <summary>

        /// 종료 Y 좌표

        /// </summary>

        private int yEnd;

        #endregion

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

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

        #region 생성자 - MainForm()

        /// <summary>

        /// 생성자

        /// </summary>

        public MainForm()

        {

            InitializeComponent();

        }

        #endregion

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

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

        #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)

        {

            Bitmap bitmap = Bitmap.FromFile("cows.jpg") as Bitmap;

            this.sourceBitmap = new Bitmap(bitmap);

            this.sourcePictureBox.Image = this.sourceBitmap;

        }

        #endregion

        #region 소스 픽처 박스 마우스 DOWN 처리하기 - sourcePictureBox_MouseDown(sender, e)

        /// <summary>

        /// 소스 픽처 박스 마우스 DOWN 처리하기

        /// </summary>

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

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

        private void sourcePictureBox_MouseDown(object sender, MouseEventArgs e)

        {

            this.isSelecting = true;

            this.xStart = e.X;

            this.yStart = e.Y;

        }

        #endregion

        #region 소스 픽처 박스 마우스 이동시 처리하기 - sourcePictureBox_MouseMove(sender, e)

        /// <summary>

        /// 소스 픽처 박스 마우스 이동시 처리하기

        /// </summary>

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

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

        private void sourcePictureBox_MouseMove(object sender, MouseEventArgs e)

        {

            if(!this.isSelecting)

            {

                return;

            }

            this.xEnd = e.X;

            this.yEnd = e.Y;

            Bitmap bitmap = new Bitmap(this.sourceBitmap);

            using(Graphics graphics = Graphics.FromImage(bitmap))

            {

                graphics.DrawRectangle

                (

                    Pens.Red,

                    Math.Min(this.xStart, this.xEnd),

                    Math.Min(this.yStart, this.yEnd),

                    Math.Abs(this.xStart - this.xEnd),

                    Math.Abs(this.yStart - this.yEnd)

                );

            }

            this.sourcePictureBox.Image = bitmap;

        }

        #endregion

        #region 소스 픽처 박스 마우스 UP 처리하기 - sourcePictureBox_MouseUp(sender, e)

        /// <summary>

        /// 소스 픽처 박스 마우스 UP 처리하기

        /// </summary>

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

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

        private void sourcePictureBox_MouseUp(object sender, MouseEventArgs e)

        {

            if(!this.isSelecting)

            {

                return;

            }

            this.isSelecting = false;

            this.sourcePictureBox.Image = this.sourceBitmap;

            int width  = Math.Abs(this.xStart - this.xEnd);

            int height = Math.Abs(this.yStart - this.yEnd);

            if((width < 1) || (height < 1))

            {

                return;

            }

            Bitmap resultBitmap = new Bitmap(width, height);

            using(Graphics graphics = Graphics.FromImage(resultBitmap))

            {

                Rectangle sourceRectangle = new Rectangle

                (

                    Math.Min(this.xStart, this.xEnd),

                    Math.Min(this.yStart, this.yEnd),

                    width,

                    height

                );

                Rectangle resultRectangle = new Rectangle(0, 0, width, height);

                graphics.DrawImage(this.sourceBitmap, resultRectangle, sourceRectangle, GraphicsUnit.Pixel);

            }

            this.resultPictureBox.Image = resultBitmap;

        }

        #endregion

    }

}