■ 개선된 투명 배경 이미지를 구하는 방법을 보여준다.
▶ MainForm.cs
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using System; using System.Collections.Generic; using System.Drawing; using System.Drawing.Drawing2D; using System.Drawing.Imaging; using System.Windows.Forms; namespace TestProject { /// <summary> /// 메인 폼 /// </summary> public partial class MainForm : Form { //////////////////////////////////////////////////////////////////////////////////////////////////// Field ////////////////////////////////////////////////////////////////////////////////////////// Private #region Field /// <summary> /// 오프셋 /// </summary> private const int OFFSET = 10; /// <summary> /// 소스 비트맵 /// </summary> private Bitmap sourceBitmap = null; /// <summary> /// 일반 투명 비트맵 /// </summary> private Bitmap normalTransparentBitmap = null; /// <summary> /// 자연스러운 투명 비트맵 /// </summary> private Bitmap naturalTransparentBitmap = null; #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor ////////////////////////////////////////////////////////////////////////////////////////// Public #region 생성자 - MainForm() /// <summary> /// 생성자 /// </summary> public MainForm() { InitializeComponent(); this.openMenuItem.Click += openMenuItem_Click; this.saveMenuItem.Click += saveMenuItem_Click; this.resetMenuItem.Click += resetMenuItem_Click; this.expandButton.Click += expandButton_Click; this.sourcePictureBox.MouseClick += sourcePictureBox_MouseClick; } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Private //////////////////////////////////////////////////////////////////////////////// Function #region 열기 메뉴 항목 클릭시 처리하기 - openMenuItem_Click(sender, e) /// <summary> /// 열기 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.sourceBitmap = LoadBitmapUnlocked(this.openFileDialog.FileName); this.normalTransparentBitmap = new Bitmap(this.sourceBitmap); this.naturalTransparentBitmap = new Bitmap(this.sourceBitmap); ShowSampleBitmap(); this.expandButton.Enabled = true; } } #endregion #region 저장 메뉴 항목 클릭시 처리하기 - saveMenuItem_Click(sender, e) /// <summary> /// 저장 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) { this.naturalTransparentBitmap.Save(this.saveFileDialog.FileName, ImageFormat.Png); } } #endregion #region 재설정 메뉴 항목 클릭시 처리하기 - resetMenuItem_Click(sender, e) /// <summary> /// 재설정 메뉴 항목 클릭시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void resetMenuItem_Click(object sender, EventArgs e) { if(MessageBox.Show("Discard changes?", "Discard changes?", MessageBoxButtons.YesNo) == DialogResult.Yes) { this.normalTransparentBitmap = new Bitmap(this.sourceBitmap); this.naturalTransparentBitmap = new Bitmap(this.sourceBitmap); ShowSampleBitmap(); } } #endregion #region 투명성 확장하기 버튼 클릭시 처리하기 - applyButton_Click(sender, e) /// <summary> /// 투명성 확장하기 버튼 클릭시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void expandButton_Click(object sender, EventArgs e) { Cursor = Cursors.WaitCursor; float maximumDistance = float.Parse(this.maximumDistanceTextBox.Text); this.naturalTransparentBitmap = ExpandTransparency(this.naturalTransparentBitmap, maximumDistance); ShowSampleBitmap(); Cursor = Cursors.Default; } #endregion #region 소스 픽처 박스 마우스 클릭시 처리하기 - sourcePictureBox_MouseClick(sender, e) /// <summary> /// 소스 픽처 박스 마우스 클릭시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void sourcePictureBox_MouseClick(object sender, MouseEventArgs e) { int x = e.X - OFFSET; int y = e.Y - OFFSET; Color color = this.sourceBitmap.GetPixel(x, y); this.normalTransparentBitmap.MakeTransparent(color); int deltaRed = int.Parse(this.deltaRedTextBox.Text ); int deltaGreen = int.Parse(this.deltaGreenTextBox.Text); int deltaBlue = int.Parse(this.deltaBlueTextBox.Text ); this.naturalTransparentBitmap = Transparentify(this.naturalTransparentBitmap, x, y, deltaRed, deltaGreen, deltaBlue); ShowSampleBitmap(); } #endregion //////////////////////////////////////////////////////////////////////////////// Function #region 잠금없이 비트맵 로드하기 - LoadBitmapUnlocked(filePath) /// <summary> /// 잠금없이 비트맵 로드하기 /// </summary> /// <param name="filePath">파일 경로</param> /// <returns>비트맵</returns> private Bitmap LoadBitmapUnlocked(string filePath) { using(Bitmap bitmap = new Bitmap(filePath)) { return new Bitmap(bitmap); } } #endregion #region 배경 설정하기 - SetBackground() /// <summary> /// 배경 설정하기 /// </summary> /// <returns>비트맵</returns> private Bitmap SetBackground() { int width = this.sourceBitmap.Width + 2 * OFFSET; int height = this.sourceBitmap.Height + 2 * OFFSET; Bitmap bitmap = new Bitmap(width, height); using(Graphics graphics = Graphics.FromImage(bitmap)) { using ( LinearGradientBrush brush = new LinearGradientBrush ( new Point(0, 0), new Point(64, 64), Color.Blue, Color.Yellow ) ) { graphics.FillRectangle(brush, 0, 0, width, height); } } return bitmap; } #endregion #region 샘플 비트맵 표시하기 - ShowSampleBitmap() /// <summary> /// 샘플 비트맵 표시하기 /// </summary> private void ShowSampleBitmap() { Bitmap bitmap; bitmap = SetBackground(); using(Graphics graphics = Graphics.FromImage(bitmap)) { graphics.DrawImage(this.sourceBitmap, OFFSET, OFFSET); } this.sourcePictureBox.Image = bitmap; bitmap = SetBackground(); using(Graphics graphics = Graphics.FromImage(bitmap)) { graphics.DrawImage(this.normalTransparentBitmap, OFFSET, OFFSET); } this.normalPictureBox.Image = bitmap; bitmap = SetBackground(); using(Graphics graphics = Graphics.FromImage(bitmap)) { graphics.DrawImage(this.naturalTransparentBitmap, OFFSET, OFFSET); } this.naturalPictureBox.Image = bitmap; this.sourcePictureBox.Visible = true; this.normalPictureBox.Visible = true; this.naturalPictureBox.Visible = true; } #endregion #region 투명하게 만들기 - Transparentify(sourceBitmap, x, y, deltaRed, deltaGreen, deltaBlue) /// <summary> /// 투명하게 만들기 /// </summary> /// <param name="sourceBitmap">소스 비트맵</param> /// <param name="x">X</param> /// <param name="y">Y</param> /// <param name="deltaRed">적색 증분</param> /// <param name="deltaGreen">녹색 증분</param> /// <param name="deltaBlue">파란색 증분</param> /// <returns>비트맵</returns> private Bitmap Transparentify(Bitmap sourceBitmap, int x, int y, int deltaRed, int deltaGreen, int deltaBlue) { Color targetColor = sourceBitmap.GetPixel(x, y); byte red = targetColor.R; byte green = targetColor.G; byte blue = targetColor.B; Bitmap bitmap = new Bitmap(sourceBitmap); Stack<Point> pointStack = new Stack<Point>(); int width = sourceBitmap.Width; int height = sourceBitmap.Height; bool[,] addedStackArray = new bool[width, height]; pointStack.Push(new Point(x, y)); addedStackArray[x, y] = true; bitmap.SetPixel(x, y, Color.Transparent); while(pointStack.Count > 0) { Point point = pointStack.Pop(); for(int i = point.X - 1; i <= point.X + 1; i++) { for(int j = point.Y - 1; j <= point.Y + 1; j++) { if((i < 0) || (i >= width) || (j < 0) || (j >= height)) { continue; } if(addedStackArray[i, j]) { continue; } Color color = sourceBitmap.GetPixel(i, j); if(Math.Abs(red - color.R) > deltaRed) { continue; } if(Math.Abs(green - color.G) > deltaGreen) { continue; } if(Math.Abs(blue - color.B) > deltaBlue) { continue; } pointStack.Push(new Point(i, j)); addedStackArray[i, j] = true; bitmap.SetPixel(i, j, Color.Transparent); } } } return bitmap; } #endregion #region 거리 배열 구하기 - GetDistanceArray(sourceBitmap, maximumDistance) /// <summary> /// 거리 배열 구하기 /// </summary> /// <param name="sourceBitmap">소스 비트맵</param> /// <param name="maximumDistance">최대 거리</param> /// <returns>거리 배열</returns> private float[,] GetDistanceArray(Bitmap sourceBitmap, float maximumDistance) { int width = sourceBitmap.Width; int height = sourceBitmap.Height; float[,] distanceArray = new float[width, height]; for(int x = 0; x < width; x++) { for(int y = 0; y < height; y++) { distanceArray[x, y] = float.PositiveInfinity; } } int maximumDistanceInteger = (int)maximumDistance; if(maximumDistanceInteger < maximumDistance) { maximumDistanceInteger++; } for(int x = 0; x < width; x++) { for(int y = 0; y < height; y++) { if(sourceBitmap.GetPixel(x, y).A == 0) { for(int deltaX = -maximumDistanceInteger; deltaX <= maximumDistanceInteger; deltaX++) { int indexX = x + deltaX; if((indexX < 0) || (indexX >= width)) { continue; } for(int deltaY = -maximumDistanceInteger; deltaY <= maximumDistanceInteger; deltaY++) { int indexY = y + deltaY; if((indexY < 0) || (indexY >= height)) { continue; } float distance = (float)Math.Sqrt(deltaX * deltaX + deltaY * deltaY); if(distanceArray[indexX, indexY] > distance) { distanceArray[indexX, indexY] = distance; } } } } } } return distanceArray; } #endregion #region 투명성 확장하기 - ExpandTransparency(sourceBitmap, maximumDistance) /// <summary> /// 투명성 확장하기 /// </summary> /// <param name="sourceBitmap">소스 비트맵</param> /// <param name="maximumDistance">최대 거리</param> /// <returns>비트맵</returns> private Bitmap ExpandTransparency(Bitmap sourceBitmap, float maximumDistance) { Bitmap targetBitmap = new Bitmap(sourceBitmap); float[,] distanceArray = GetDistanceArray(sourceBitmap, maximumDistance); int width = sourceBitmap.Width; int height = sourceBitmap.Height; for(int x = 0; x < width; x++) { for(int y = 0; y < height; y++) { if(sourceBitmap.GetPixel(x, y).A == 0) { continue; } float distance = distanceArray[x, y]; if(distance > maximumDistance) { continue; } float scale = distance / maximumDistance; Color color = sourceBitmap.GetPixel(x, y); int red = color.R; int green = color.G; int blue = color.B; int alpha = (int)(255 * scale); color = Color.FromArgb(alpha, red, green, blue); targetBitmap.SetPixel(x, y, color); } } return targetBitmap; } #endregion } } |
