■ Bitmap 클래스를 사용해 비트맵 크기를 변경하는 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; #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor ////////////////////////////////////////////////////////////////////////////////////////// Public #region 생성자 - MainForm() /// <summary> /// 생성자 /// </summary> public MainForm() { InitializeComponent(); this.openMenuItem.Click += openMenuItem_Click; this.saveMenuItem.Click += saveMenuItem_Click; this.scaleTextBox.TextChanged += scaleTextBox_TextChanged; } #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 = LoadBitmapUnlocked(this.openFileDialog.FileName); ShowImage(); } } #endregion #region Save 메뉴 항목 클릭시 처리하기 - saveMenuItem_Click(sender, e) /// <summary> /// Save 메뉴 항목 클릭시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void saveMenuItem_Click(object sender, EventArgs e) { if(this.saveFileDialog.ShowDialog() == DialogResult.OK) { if(!this.saveFileDialog.FileName.ToLower().EndsWith(".png")) { DialogResult result = MessageBox.Show ( "Transparency will be lost unless you save with the PNG format. Do you want to save Anyway?", "Save Anyway?", MessageBoxButtons.YesNo ); if(result == DialogResult.No) { return; } } SaveImage(this.pictureBox.Image, this.saveFileDialog.FileName); } } #endregion #region Scale 텍스트 박스 텍스트 변경시 처리하기 - scaleTextBox_TextChanged(sender, e) /// <summary> /// Scale 텍스트 박스 텍스트 변경시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void scaleTextBox_TextChanged(object sender, EventArgs e) { ShowImage(); } #endregion //////////////////////////////////////////////////////////////////////////////// Function #region 잠금없이 비트맵 로드하기 - LoadBitmapUnlocked(filePame) /// <summary> /// 잠금없이 비트맵 로드하기 /// </summary> /// <param name="filePame">파일 경로</param> /// <returns>비트맵</returns> private Bitmap LoadBitmapUnlocked(string filePame) { using(Bitmap bitmap = new Bitmap(filePame)) { return new Bitmap(bitmap); } } #endregion #region 이미지 표시하기 - ShowImage() /// <summary> /// 이미지 표시하기 /// </summary> private void ShowImage() { this.sizeLabel.Text = "Size : "; this.pictureBox.Visible = false; if(this.originalBitmap == null) { return; } float scale; if(!float.TryParse(this.scaleTextBox.Text, out scale)) { return; } if(scale < 0.0001) { return; } int width = (int)(this.originalBitmap.Width * scale); int height = (int)(this.originalBitmap.Height * scale); this.sizeLabel.Text = string.Format("Size : {0} x {1}", width, height); Bitmap bitmap = new Bitmap(width, height); using(Graphics graphics = Graphics.FromImage(bitmap)) { graphics.InterpolationMode = InterpolationMode.HighQualityBicubic; Rectangle targetRectangle = new Rectangle(0, 0, width, height); Rectangle sourceRectangle = new Rectangle(0, 0, this.originalBitmap.Width, this.originalBitmap.Height); graphics.DrawImage(this.originalBitmap, targetRectangle, sourceRectangle, GraphicsUnit.Pixel); } this.pictureBox.Image = bitmap; this.pictureBox.Visible = true; } #endregion #region 이미지 저장하기 - SaveImage(image, filePath) /// <summary> /// 이미지 저장하기 /// </summary> /// <param name="image">이미지</param> /// <param name="filePath">파일 경로</param> public void SaveImage(Image image, string filePath) { string fileExtension = Path.GetExtension(filePath); switch(fileExtension.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 " + fileExtension); } } #endregion } } |
