■ 별점(Star Rating)을 그리는 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 { //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor ////////////////////////////////////////////////////////////////////////////////////////// Public #region 생성자 - MainForm() /// <summary> /// 생성자 /// </summary> public MainForm() { InitializeComponent(); } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Private //////////////////////////////////////////////////////////////////////////////// Event #region 그리기 버튼 클릭시 처리하기 - drawButton_Click(sender, e) /// <summary> /// 그리기 버튼 클릭시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void drawButton_Click(object sender, EventArgs e) { int fillStarCount = int.Parse(this.fillStarCountTextBox.Text); int starHeight = int.Parse(this.starHeightTextBox.Text); double radius = starHeight / (1 + Math.Sin(GetRadian(54))); double starWidth = 2 * radius * Math.Cos(GetRadian(18)); double margin = starWidth * 0.1; double x = margin; double minmumY = margin; Rectangle rectangle = new Rectangle ( (int)x, (int)minmumY, (int)(2 * radius), (int)(2 * radius) ); int bitmapWidth = (int)(5 * starWidth + 6 * margin); int bitmapHeight = (int)( starHeight + 2 * margin); Bitmap bitmap = new Bitmap(bitmapWidth, bitmapHeight); using(Graphics graphics = Graphics.FromImage(bitmap)) { graphics.Clear(Color.Transparent); graphics.SmoothingMode = SmoothingMode.AntiAlias; for(int i = 0; i < 5; i++) { PointF[] pointArray = GetStarPointArray(-Math.PI / 2, 5, 2, rectangle); if(i < fillStarCount) { graphics.FillPolygon(Brushes.Yellow, pointArray); } else { graphics.FillPolygon(Brushes.White, pointArray); } graphics.DrawPolygon(Pens.Black, pointArray); x += starWidth + margin; rectangle.X = (int)x; } } this.pictureBox.Image = bitmap; this.pictureBox.Visible = true; string filePath = fillStarCount.ToString() + "stars.png"; SaveImage(bitmap, filePath); } #endregion //////////////////////////////////////////////////////////////////////////////// Function #region 라디안 구하기 - GetRadian(degree) /// <summary> /// 라디안 구하기 /// </summary> /// <param name="degree">도</param> /// <returns>라디안</returns> private double GetRadian(double degree) { return degree * Math.PI / 180; } #endregion #region 교차점 찾기 - FindIntersectionPoint(startPoint1, endPoint1, startPoint2, endPoint2, linesIntersect, segmentsIntersect, intersectionPoint, closePoint1, closePoint2) /// <summary> /// 교차점 찾기 /// </summary> /// <param name="startPoint1">시작 포인트 1</param> /// <param name="endPoint1">종료 포인트 1</param> /// <param name="startPoint2">시작 포인트 2</param> /// <param name="endPoint2">종료 포인트 2</param> /// <param name="linesIntersect">선 교차 여부</param> /// <param name="segmentsIntersect">세그먼트 교차 여부</param> /// <param name="intersectionPoint">교차점</param> /// <param name="closePoint1">근접 포인트 1</param> /// <param name="closePoint2">근접 포인트 2</param> private void FindIntersectionPoint ( PointF startPoint1, PointF endPoint1, PointF startPoint2, PointF endPoint2, out bool linesIntersect, out bool segmentsIntersect, out PointF intersectionPoint, out PointF closePoint1, out PointF closePoint2 ) { float deltaX1 = endPoint1.X - startPoint1.X; float deltaY1 = endPoint1.Y - startPoint1.Y; float deltaX2 = endPoint2.X - startPoint2.X; float deltaY2 = endPoint2.Y - startPoint2.Y; float denominator = (deltaY1 * deltaX2 - deltaX1 * deltaY2); float t1 = ((startPoint1.X - startPoint2.X) * deltaY2 + (startPoint2.Y - startPoint1.Y) * deltaX2) / denominator; if(float.IsInfinity(t1)) { linesIntersect = false; segmentsIntersect = false; intersectionPoint = new PointF(float.NaN, float.NaN); closePoint1 = new PointF(float.NaN, float.NaN); closePoint2 = new PointF(float.NaN, float.NaN); return; } linesIntersect = true; float t2 = ((startPoint2.X - startPoint1.X) * deltaY1 + (startPoint1.Y - startPoint2.Y) * deltaX1) / -denominator; intersectionPoint = new PointF(startPoint1.X + deltaX1 * t1, startPoint1.Y + deltaY1 * t1); segmentsIntersect = ((t1 >= 0) && (t1 <= 1) && (t2 >= 0) && (t2 <= 1)); if(t1 < 0) { t1 = 0; } else if(t1 > 1) { t1 = 1; } if(t2 < 0) { t2 = 0; } else if(t2 > 1) { t2 = 1; } closePoint1 = new PointF(startPoint1.X + deltaX1 * t1, startPoint1.Y + deltaY1 * t1); closePoint2 = new PointF(startPoint2.X + deltaX2 * t2, startPoint2.Y + deltaY2 * t2); } #endregion #region 오목 반경 계산하기 - CalculateConcaveRadius(pointCount, skipCount) /// <summary> /// 오목 반경 계산하기 /// </summary> /// <param name="pointCount">포인트 카운트</param> /// <param name="skipCount">스킵 카운트</param> /// <returns>오목 반경</returns> private double CalculateConcaveRadius(int pointCount, int skipCount) { if(pointCount < 5) { return 0.33f; } double deltaTheta = 2 * Math.PI / pointCount; double theta00 = -Math.PI / 2; double theta01 = theta00 + deltaTheta * skipCount; double theta10 = theta00 + deltaTheta; double theta11 = theta10 - deltaTheta * skipCount; PointF point00 = new PointF ( (float)Math.Cos(theta00), (float)Math.Sin(theta00) ); PointF point01 = new PointF ( (float)Math.Cos(theta01), (float)Math.Sin(theta01) ); PointF point10 = new PointF ( (float)Math.Cos(theta10), (float)Math.Sin(theta10) ); PointF point11 = new PointF ( (float)Math.Cos(theta11), (float)Math.Sin(theta11) ); bool linesIntersect; bool segmentsIntersect; PointF intersectionPoint; PointF closePoint1; PointF closePoint2; FindIntersectionPoint ( point00, point01, point10, point11, out linesIntersect, out segmentsIntersect, out intersectionPoint, out closePoint1, out closePoint2 ); return Math.Sqrt(intersectionPoint.X * intersectionPoint.X + intersectionPoint.Y * intersectionPoint.Y); } #endregion #region 별 포인트 배열 구하기 - GetStarPointArray(startTheta, pointCount, skipCount, rectangle) /// <summary> /// 별 포인트 배열 구하기 /// </summary> /// <param name="startTheta">시작 세타</param> /// <param name="pointCount">포인트 수</param> /// <param name="skipCount">건너뛰기 수</param> /// <param name="rectangle">사각형</param> /// <returns>별 포인트 배열</returns> private PointF[] GetStarPointArray(double startTheta, int pointCount, int skipCount, Rectangle rectangle) { double theta; double deltaTheta; PointF[] pointArray; float rx = rectangle.Width / 2f; float ry = rectangle.Height / 2f; float cx = rectangle.X + rx; float cy = rectangle.Y + ry; if(skipCount == 1) { pointArray = new PointF[pointCount]; theta = startTheta; deltaTheta = 2 * Math.PI / pointCount; for(int i = 0; i < pointCount; i++) { pointArray[i] = new PointF ( (float)(cx + rx * Math.Cos(theta)), (float)(cy + ry * Math.Sin(theta)) ); theta += deltaTheta; } return pointArray; } double concaveRadius = CalculateConcaveRadius(pointCount, skipCount); pointArray = new PointF[2 * pointCount]; theta = startTheta; deltaTheta = Math.PI / pointCount; for(int i = 0; i < pointCount; i++) { pointArray[2 * i] = new PointF ( (float)(cx + rx * Math.Cos(theta)), (float)(cy + ry * Math.Sin(theta)) ); theta += deltaTheta; pointArray[2 * i + 1] = new PointF ( (float)(cx + rx * Math.Cos(theta) * concaveRadius), (float)(cy + ry * Math.Sin(theta) * concaveRadius) ); theta += deltaTheta; } return pointArray; } #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 } } |
