■ Bitmap 클래스를 사용해 이미지 나선 효과를 만드는 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.IO; using System.Windows.Forms; namespace TestProject { /// <summary> /// 메인 폼 /// </summary> public partial class MainForm : Form { //////////////////////////////////////////////////////////////////////////////////////////////////// Field ////////////////////////////////////////////////////////////////////////////////////////// Private #region Field /// <summary> /// 색상 배열 /// </summary> private Color[] colorArray = { Color.Red, Color.OrangeRed, Color.Yellow, Color.Green, Color.Blue, Color.Indigo, Color.Fuchsia, }; /// <summary> /// 소스 비트맵 /// </summary> private Bitmap sourceBitmap = null; #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor ////////////////////////////////////////////////////////////////////////////////////////// Public #region 생성자 - MainForm() /// <summary> /// 생성자 /// </summary> public MainForm() { InitializeComponent(); this.openMenuItem.Click += openMenuItem_Click; this.saveAsMenuItem.Click += saveAsMenuItem_Click; this.thicknessTextBox.TextChanged += parameterTextBox_TextChanged; this.colorScaleTextBox.TextChanged += parameterTextBox_TextChanged; this.opacityTextBox.TextChanged += parameterTextBox_TextChanged; this.drawOutlineCheckBox.CheckedChanged += parameterCheckBox_CheckedChanged; this.applyEllipticalMaskCheckBox.CheckedChanged += parameterCheckBox_CheckedChanged; } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Private //////////////////////////////////////////////////////////////////////////////// Event #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); DrawImage(); } } #endregion #region 다른 이름으로 저장 메뉴 항목 클릭시 처리하기 - saveAsMenuItem_Click(sender, e) /// <summary> /// 다른 이름으로 저장 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) { SaveImage(this.pictureBox.Image, this.saveFileDialog.FileName); } } #endregion #region 매개 변수 텍스트 박스 텍스트 변경시 처리하기 - parameterTextBox_TextChanged(sender, e) /// <summary> /// 매개 변수 텍스트 박스 텍스트 변경시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void parameterTextBox_TextChanged(object sender, EventArgs e) { DrawImage(); } #endregion #region 매개 변수 체크 박스 체크 변경시 처리하기 - parameterCheckBox_CheckedChanged(sender, e) /// <summary> /// 매개 변수 체크 박스 체크 변경시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void parameterCheckBox_CheckedChanged(object sender, EventArgs e) { DrawImage(); } #endregion //////////////////////////////////////////////////////////////////////////////// Function #region 잠금 없이 비트맵 로드하기 - LoadBitmapUnlocked(filePath) /// <summary> /// 잠금 없이 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 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 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($"알 수 없는 파일 확장자 : {fileExtension}"); } } #endregion #region 거리 구하기 - GetDistance(point1, point2) /// <summary> /// 거리 구하기 /// </summary> /// <param name="point1">포인트 1</param> /// <param name="point2">포인트 2</param> /// <returns>거리</returns> private float GetDistance(PointF point1, PointF point2) { float deltaX = point1.X - point2.X; float deltaY = point1.Y - point2.Y; return (float)Math.Sqrt(deltaX * deltaX + deltaY * deltaY); } #endregion #region 거리 구하기 - GetDistance(point, rectangle) /// <summary> /// 거리 구하기 /// </summary> /// <param name="point">포인트</param> /// <param name="rectangle">사각형</param> /// <returns>거리</returns> private float GetDistance(PointF point, Rectangle rectangle) { float maximumDistance = GetDistance(point, new PointF(rectangle.Left, rectangle.Top)); float testDistance = GetDistance(point, new PointF(rectangle.Left, rectangle.Bottom)); if(maximumDistance < testDistance) { maximumDistance = testDistance; } testDistance = GetDistance(point, new PointF(rectangle.Right, rectangle.Top)); if(maximumDistance < testDistance) { maximumDistance = testDistance; } testDistance = GetDistance(point, new PointF(rectangle.Right, rectangle.Bottom)); if(maximumDistance < testDistance) { maximumDistance = testDistance; } return maximumDistance; } #endregion #region 극 좌표 → 직교 좌표 변환하기 - ConvertPolarToCartesian(radius, theta, x, y) /// <summary> /// 극 좌표 → 직교 좌표 변환하기 /// </summary> /// <param name="radius">반경</param> /// <param name="theta">세타</param> /// <param name="x">X</param> /// <param name="y">Y</param> private void ConvertPolarToCartesian(float radius, float theta, out float x, out float y) { x = (float)(radius * Math.Cos(theta)); y = (float)(radius * Math.Sin(theta)); } #endregion #region 나선 포인트 리스트 구하기 - GetSpiralPointList(centerPoint, thickness, angleOffset, maximumTheta) /// <summary> /// 나선 포인트 리스트 구하기 /// </summary> /// <param name="centerPoint">중심 포인트</param> /// <param name="thickness">두께</param> /// <param name="angleOffset">각도 오프셋</param> /// <param name="maximumTheta">최대 세타</param> /// <returns>나선 포인트 리스트</returns> private List<PointF> GetSpiralPointList(PointF centerPoint, float thickness, float angleOffset, float maximumTheta) { List<PointF> pointList = new List<PointF>(); const float deltaTheta = (float)(5 * Math.PI / 180); for(float theta = 0; ; theta += deltaTheta) { float radius = thickness * theta; float x; float y; ConvertPolarToCartesian(radius, theta + angleOffset, out x, out y); x += centerPoint.X; y += centerPoint.Y; pointList.Add(new PointF((float)x, (float)y)); if(theta + angleOffset > maximumTheta) { break; } } return pointList; } #endregion #region 색상화 비트맵 구하기 - GetColorizeBitmap(sourceBitmap, color, colorScale) /// <summary> /// 색상화 비트맵 구하기 /// </summary> /// <param name="sourceBitmap">소스 비트맵</param> /// <param name="color">색상</param> /// <param name="colorScale">색상 스케일</param> /// <returns>색상화 비트맵</returns> private Bitmap GetColorizeBitmap(Bitmap sourceBitmap, Color color, float colorScale) { ColorMatrix colorMatrix = new ColorMatrix ( new float[][] { new float[] { color.R / 255f * colorScale, 0 , 0 , 0, 0}, new float[] { 0 , color.G / 255f * colorScale, 0 , 0, 0}, new float[] { 0 , 0 , color.B / 255f * colorScale, 0, 0}, new float[] { 0 , 0 , 0 , 1, 0}, new float[] { 0 , 0 , 0 , 0, 1} } ); int width = sourceBitmap.Width; int height = sourceBitmap.Height; Bitmap targetBitmap = new Bitmap(width, height); using(ImageAttributes imageAttributes = new ImageAttributes()) { imageAttributes.SetColorMatrix(colorMatrix); using(Graphics graphics = Graphics.FromImage(targetBitmap)) { Point[] targetPointArray = { new Point(0 , 0 ), new Point(width, 0 ), new Point(0 , height) }; Rectangle sourceRectangle = new Rectangle(0, 0, width, height); graphics.DrawImage ( sourceBitmap, targetPointArray, sourceRectangle, GraphicsUnit.Pixel, imageAttributes ); } } return targetBitmap; } #endregion #region 타원형 비트맵 구하기 - GetEllipticalBitmap(sourceBitmap) /// <summary> /// 타원형 비트맵 구하기 /// </summary> /// <param name="sourceBitmap">소스 비트맵</param> /// <returns>타원형 비트맵</returns> private Bitmap GetEllipticalBitmap(Bitmap sourceBitmap) { Bitmap targetBitmap = (Bitmap)sourceBitmap.Clone(); using(Graphics graphics = Graphics.FromImage(targetBitmap)) { graphics.Clear(Color.Transparent); using(TextureBrush brush = new TextureBrush(sourceBitmap)) { Rectangle rectangle = new Rectangle(0, 0, sourceBitmap.Width, sourceBitmap.Height); graphics.FillEllipse(brush, rectangle); } } return targetBitmap; } #endregion #region 나선 비트맵 구하기 - SpiralizeBitmap(sourceBitmap, colorArray, thickness, colorScale, opacity, drawOutline, applyEllipticalMask) /// <summary> /// 나선 비트맵 구하기 /// </summary> /// <param name="sourceBitmap">소스 비트맵</param> /// <param name="colorArray">색상 배열</param> /// <param name="thickness">두께</param> /// <param name="colorScale">색상 스케일</param> /// <param name="opacity">불투명도</param> /// <param name="drawOutline">윤곽선 그리기 여부</param> /// <param name="applyEllipticalMask">타원 마스크 적용 여부</param> /// <returns>나선 비트맵</returns> private Bitmap SpiralizeBitmap ( Bitmap sourceBitmap, Color[] colorArray, float thickness, float colorScale, float opacity, bool drawOutline, bool applyEllipticalMask ) { int width = sourceBitmap.Width; int height = sourceBitmap.Height; Bitmap spiralBitmap = new Bitmap(width, height); using(Graphics graphics = Graphics.FromImage(spiralBitmap)) { graphics.Clear(this.pictureBox.BackColor); graphics.SmoothingMode = SmoothingMode.AntiAlias; int spiralCount = colorArray.Length; float angularSpacing = (float)(2 * Math.PI / spiralCount); float startAngle = 0; PointF centerPoint = new PointF(width / 2, height / 2); Rectangle rectangle = new Rectangle(0, 0, width, height); float maximumDistance = GetDistance(centerPoint, rectangle); float maximumTheta = maximumDistance / thickness + 2 * (float)Math.PI; List<List<PointF>> spiralPointList = new List<List<PointF>>(); for(int i = 0; i <= spiralCount; i++) { spiralPointList.Add ( GetSpiralPointList ( centerPoint, thickness, startAngle, maximumTheta ) ); startAngle += angularSpacing; } for(int i = 0; i < spiralCount; i++) { List<PointF> pointList1 = new List<PointF>(spiralPointList[i ]); List<PointF> pointList2 = new List<PointF>(spiralPointList[i + 1]); pointList2.Reverse(); pointList1.AddRange(pointList2); using(Bitmap colorizedBitmap = GetColorizeBitmap(this.sourceBitmap, this.colorArray[i], colorScale)) { using(TextureBrush brush = new TextureBrush(colorizedBitmap)) { graphics.FillPolygon(brush, pointList1.ToArray()); } } if(drawOutline) { graphics.DrawLines(Pens.Black, pointList1.ToArray()); } } } Bitmap targetBitmap = (Bitmap)sourceBitmap.Clone(); using(Graphics graphics = Graphics.FromImage(targetBitmap)) { ColorMatrix colorMatrix = new ColorMatrix(); colorMatrix.Matrix33 = opacity; ImageAttributes imageAttributes = new ImageAttributes(); imageAttributes.SetColorMatrix ( colorMatrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap ); Rectangle rectangle = new Rectangle(0, 0, targetBitmap.Width, targetBitmap.Height); graphics.DrawImage ( spiralBitmap, rectangle, 0, 0, targetBitmap.Width, targetBitmap.Height, GraphicsUnit.Pixel, imageAttributes ); } if(applyEllipticalMask) { targetBitmap = GetEllipticalBitmap(targetBitmap); } return targetBitmap; } #endregion #region 이미지 그리기 - DrawImage() /// <summary> /// 이미지 그리기 /// </summary> private void DrawImage() { if(this.sourceBitmap == null) { return; } float thickness; float colorScale; float opacity; if(!float.TryParse(this.thicknessTextBox.Text, out thickness)) { return; } if(!float.TryParse(this.colorScaleTextBox.Text, out colorScale)) { return; } if(!float.TryParse(this.opacityTextBox.Text, out opacity)) { return; } this.pictureBox.Image = SpiralizeBitmap ( this.sourceBitmap, this.colorArray, thickness, colorScale, opacity, this.drawOutlineCheckBox.Checked, this.applyEllipticalMaskCheckBox.Checked ); } #endregion } } |
