■ Bitmap 클래스를 사용해 투명한 구멍을 갖는 비트맵을 만드는 방법을 보여준다.
▶ MainForm.cs
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using System; using System.Drawing; using System.Drawing.Drawing2D; using System.Drawing.Imaging; using System.IO; using System.Windows.Forms; namespace TestProject { /// <summary> /// 메인 폼 /// </summary> public partial class MainForm : Form { //////////////////////////////////////////////////////////////////////////////////////////////////// Field ////////////////////////////////////////////////////////////////////////////////////////// Private #region Field /// <summary> /// 원본 비트맵 /// </summary> private Bitmap originalBitmap = null; /// <summary> /// 그리기 여부 /// </summary> private bool isDrawing = false; /// <summary> /// 시작 포인트 /// </summary> private Point startPoint; /// <summary> /// 종료 포인트 /// </summary> private Point endPoint; #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor ////////////////////////////////////////////////////////////////////////////////////////// Public #region 생성자 - MainForm() /// <summary> /// 생성자 /// </summary> public MainForm() { InitializeComponent(); this.openMenuItem.Click += openMenuItem_Click; this.saveAsMenuItem.Click += saveAsMenuItem_Click; this.exitMenuItem.Click += exitMenuItem_Click; this.pictureBox.MouseDown += pictureBox_MouseDown; this.pictureBox.MouseMove += pictureBox_MouseMove; this.pictureBox.MouseUp += pictureBox_MouseUp; } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Private //////////////////////////////////////////////////////////////////////////////// Event #region Open 메뉴 항목 클릭시 처리하기 - openMenuItem_Click(sender, e) /// <summary> /// Open 메뉴 항목 클릭시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void openMenuItem_Click(object sender, EventArgs e) { if(this.openFileDialog.ShowDialog() == DialogResult.OK) { this.originalBitmap = new Bitmap(this.openFileDialog.FileName); this.pictureBox.Image = new Bitmap(this.openFileDialog.FileName); this.saveAsMenuItem.Enabled = true; this.pictureBox.Visible = true; } } #endregion #region Save 메뉴 항목 클릭시 처리하기 - saveAsMenuItem_Click(sender, e) /// <summary> /// Save 메뉴 항목 클릭시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void saveAsMenuItem_Click(object sender, EventArgs e) { if(this.saveFileDialog.ShowDialog() == DialogResult.OK) { using(Bitmap bitmap = CutOutOval(this.startPoint, this.endPoint)) { SaveImage(bitmap, this.saveFileDialog.FileName); Bitmap sampleBitmap = new Bitmap(bitmap.Width, bitmap.Height); using(Graphics graphics = Graphics.FromImage(sampleBitmap)) { for(int y = 0; y < bitmap.Height; y += 16) { int temporaryY = y / 16; for(int x = 0; x < bitmap.Width; x += 16) { int temporaryX = x / 16; if((temporaryX + temporaryY) % 2 == 0) { graphics.FillRectangle(Brushes.Red, x, y, 16, 16); } else { graphics.FillRectangle(Brushes.Black, x, y, 16, 16); } } } Rectangle rectangle = new Rectangle(0, 0, bitmap.Width, bitmap.Height); using(TextureBrush brush = new TextureBrush(bitmap, rectangle)) { graphics.FillRectangle(brush, rectangle); } this.pictureBox.Image = sampleBitmap; } } } } #endregion #region Exit 메뉴 항목 클릭시 처리하기 - exitMenuItem_Click(sender, e) /// <summary> /// Exit 메뉴 항목 클릭시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void exitMenuItem_Click(object sender, EventArgs e) { Close(); } #endregion #region 픽처 박스 마우스 DOWN 처리하기 - pictureBox_MouseDown(sender, e) /// <summary> /// 픽처 박스 마우스 DOWN 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void pictureBox_MouseDown(object sender, MouseEventArgs e) { this.isDrawing = true; this.startPoint = e.Location; this.endPoint = e.Location; } #endregion #region 픽처 박스 마우스 이동시 처리하기 - pictureBox_MouseMove(sender, e) /// <summary> /// 픽처 박스 마우스 이동시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void pictureBox_MouseMove(object sender, MouseEventArgs e) { if(!this.isDrawing) { return; } this.endPoint = e.Location; DrawImage(); } #endregion #region 픽처 박스 마우스 UP 처리하기 - pictureBox_MouseUp(sender, e) /// <summary> /// 픽처 박스 마우스 UP 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void pictureBox_MouseUp(object sender, MouseEventArgs e) { this.isDrawing = false; } #endregion //////////////////////////////////////////////////////////////////////////////// Function #region 원 잘라내기 - CutOutOval(startPoint, endPoint) /// <summary> /// 원 잘라내기 /// </summary> /// <param name="startPoint">시작 포인트</param> /// <param name="endPoint">종료 포인트</param> /// <returns>비트맵</returns> private Bitmap CutOutOval(Point startPoint, Point endPoint) { Rectangle fullRectangle = new Rectangle ( 0, 0, this.originalBitmap.Width, this.originalBitmap.Height ); Region region = new Region(fullRectangle); Rectangle ellipseRectangle = GetRectangle(startPoint, endPoint); GraphicsPath path = new GraphicsPath(); path.AddEllipse(ellipseRectangle); region.Exclude(path); Bitmap bitmap = new Bitmap(originalBitmap); using(Graphics graphics = Graphics.FromImage(bitmap)) { graphics.Clear(Color.Transparent); graphics.SetClip(region, CombineMode.Replace); graphics.SmoothingMode = SmoothingMode.AntiAlias; using(TextureBrush brush = new TextureBrush(originalBitmap, fullRectangle)) { graphics.FillRectangle(brush, fullRectangle); } } return bitmap; } #endregion #region 이미지 저장하기 - SaveImage(image, filePath) /// <summary> /// 이미지 저장하기 /// </summary> /// <param name="image">이미지</param> /// <param name="filePath">파일 경로</param> private void SaveImage(Image image, string filePath) { string extension = Path.GetExtension(filePath); switch(extension.ToLower()) { case ".bmp" : image.Save(filePath, ImageFormat.Bmp ); break; case ".exif" : image.Save(filePath, ImageFormat.Exif); break; case ".gif" : image.Save(filePath, ImageFormat.Gif ); break; case ".jpg" : case ".jpeg" : image.Save(filePath, ImageFormat.Jpeg); break; case ".png" : image.Save(filePath, ImageFormat.Png ); break; case ".tif" : case ".tiff" : image.Save(filePath, ImageFormat.Tiff); break; default : throw new NotSupportedException("Unknown file extension " + extension); } } #endregion #region 사각형 구하기 - GetRectangle(startPoint, endPoint) /// <summary> /// 사각형 구하기 /// </summary> /// <param name="startPoint">시작 포인트</param> /// <param name="endPoint">종료 포인트</param> /// <returns>사각형</returns> private Rectangle GetRectangle(Point startPoint, Point endPoint) { int x = Math.Min(startPoint.X, endPoint.X); int y = Math.Min(startPoint.Y, endPoint.Y); int width = Math.Abs(endPoint.X - startPoint.X); int height = Math.Abs(endPoint.Y - startPoint.Y); return new Rectangle(x, y, width, height); } #endregion #region 이미지 그리기 - DrawImage() /// <summary> /// 이미지 그리기 /// </summary> private void DrawImage() { Bitmap bitmap = new Bitmap(this.originalBitmap); using(Graphics graphics = Graphics.FromImage(bitmap)) { graphics.SmoothingMode = SmoothingMode.AntiAlias; using(Pen pen = new Pen(Color.Magenta, 3)) { graphics.DrawEllipse(pen, GetRectangle(this.startPoint, this.endPoint)); } } this.pictureBox.Image = bitmap; } #endregion } } |
