■ 호(arc) 위의 마우스 위치 여부를 구하는 방법을 보여준다.
▶ ArcPart.cs
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namespace TestProject { /// <summary> /// 아크 파트 /// </summary> public enum ArcPart { /// <summary> /// 해당 무 /// </summary> None, /// <summary> /// 시작 포인트 /// </summary> StartPoint, /// <summary> /// 종료 포인트 /// </summary> EndPoint, /// <summary> /// 몸체 /// </summary> Body, } } |
▶ MainForm.cs
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using System; using System.Collections.Generic; using System.Drawing; using System.Drawing.Drawing2D; using System.Windows.Forms; namespace TestProject { /// <summary> /// 메인 폼 /// </summary> public partial class MainForm : Form { //////////////////////////////////////////////////////////////////////////////////////////////////// Field ////////////////////////////////////////////////////////////////////////////////////////// Private #region Field /// <summary> /// 아크 사각형 /// </summary> private RectangleF arcRectangle; /// <summary> /// 시작 각도 /// </summary> private float startAngle; /// <summary> /// 스윕 각도 /// </summary> private float sweepAngle; /// <summary> /// 종료 포인트 배열 /// </summary> private PointF[] endPointArray; #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor ////////////////////////////////////////////////////////////////////////////////////////// Public #region 생성자 - MainForm() /// <summary> /// 생성자 /// </summary> public MainForm() { InitializeComponent(); Load += Form_Load; this.canvas.Paint += canvas_Paint; this.canvas.MouseMove += canvas_MouseMove; } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Private //////////////////////////////////////////////////////////////////////////////// Event #region 폼 로드시 처리하기 - Form_Load(sender, e) /// <summary> /// 폼 로드시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void Form_Load(object sender, EventArgs e) { this.arcRectangle = new RectangleF ( 20, 20, this.canvas.ClientSize.Width - 40, this.canvas.ClientSize.Height - 40 ); this.startAngle = 45; this.sweepAngle = 255; this.endPointArray = FindArcEndPointArray ( this.arcRectangle, this.startAngle, this.startAngle + this.sweepAngle ); } #endregion #region 캔버스 페인트시 처리하기 - canvas_Paint(sender, e) /// <summary> /// 캔버스 페인트시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void canvas_Paint(object sender, PaintEventArgs e) { e.Graphics.Clear(this.canvas.BackColor); e.Graphics.SmoothingMode = SmoothingMode.AntiAlias; using(Pen pen = new Pen(Color.Blue, 6)) { e.Graphics.DrawArc(pen, this.arcRectangle, this.startAngle, this.sweepAngle); } for(int i = 0; i < 2; i++) { RectangleF rectangle = new RectangleF ( this.endPointArray[i].X - 3, this.endPointArray[i].Y - 3, 6, 6 ); e.Graphics.FillRectangle(Brushes.White, rectangle); e.Graphics.DrawRectangle(Pens.Black, Rectangle.Round(rectangle)); } } #endregion #region 캔버스 마우스 이동시 처리하기 - canvas_MouseMove(sender, e) /// <summary> /// 캔버스 마우스 이동시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void canvas_MouseMove(object sender, MouseEventArgs e) { switch(GetArcPart(arcRectangle, endPointArray[0], endPointArray[1], e.Location, 3)) { case ArcPart.None : this.canvas.Cursor = Cursors.Default; break; case ArcPart.Body : this.canvas.Cursor = Cursors.SizeAll; break; case ArcPart.StartPoint : this.canvas.Cursor = Cursors.PanWest; break; case ArcPart.EndPoint : this.canvas.Cursor = Cursors.PanEast; break; default : throw new Exception("Unknown arc part"); } } #endregion //////////////////////////////////////////////////////////////////////////////// Function #region 타원 세그먼트 교차 포인트 배열 찾기 - FindEllipseSegmentIntersectionPointArray(rectangle, point1, point2, segmentOnly) /// <summary> /// 타원 세그먼트 교차 포인트 배열 찾기 /// </summary> /// <param name="rectangle">사각형</param> /// <param name="point1">포인트 1</param> /// <param name="point2">포인트 2</param> /// <param name="segmentOnly">세그먼트 전용 여부</param> /// <returns>타원 세그먼트 교차 포인트 배열</returns> private static PointF[] FindEllipseSegmentIntersectionPointArray ( RectangleF rectangle, PointF point1, PointF point2, bool segmentOnly ) { if((rectangle.Width == 0) || (rectangle.Height == 0) || ((point1.X == point2.X) && (point1.Y == point2.Y))) { return new PointF[] { }; } if(rectangle.Width < 0) { rectangle.X = rectangle.Right; rectangle.Width = -rectangle.Width; } if(rectangle.Height < 0) { rectangle.Y = rectangle.Bottom; rectangle.Height = -rectangle.Height; } float centerX = rectangle.Left + rectangle.Width / 2f; float centerY = rectangle.Top + rectangle.Height / 2f; rectangle.X -= centerX; rectangle.Y -= centerY; point1.X -= centerX; point1.Y -= centerY; point2.X -= centerX; point2.Y -= centerY; float a = rectangle.Width / 2; float b = rectangle.Height / 2; float A = (point2.X - point1.X) * (point2.X - point1.X) / a / a + (point2.Y - point1.Y) * (point2.Y - point1.Y) / b / b; float B = 2 * point1.X * (point2.X - point1.X) / a / a + 2 * point1.Y * (point2.Y - point1.Y) / b / b; float C = point1.X * point1.X / a / a + point1.Y * point1.Y / b / b - 1; List<float> valueList = new List<float>(); float discriminant = B * B - 4 * A * C; if(discriminant == 0) { valueList.Add(-B / 2 / A); } else if(discriminant > 0) { valueList.Add((float)((-B + Math.Sqrt(discriminant)) / 2 / A)); valueList.Add((float)((-B - Math.Sqrt(discriminant)) / 2 / A)); } List<PointF> pointList = new List<PointF>(); foreach(float value in valueList) { if(!segmentOnly || ((value >= 0f) && (value <= 1f))) { float x = point1.X + (point2.X - point1.X) * value + centerX; float y = point1.Y + (point2.Y - point1.Y) * value + centerY; pointList.Add(new PointF(x, y)); } } return pointList.ToArray(); } #endregion #region 아크 종단 포인트 배열 찾기 - FindArcEndPointArray(rectangle, degree1, degree2) /// <summary> /// 아크 종단 포인트 배열 찾기 /// </summary> /// <param name="rectangle">사각형</param> /// <param name="degree1">각도 1</param> /// <param name="degree2">각도 2</param> /// <returns>아크 종단 포인트 배열</returns> private PointF[] FindArcEndPointArray(RectangleF rectangle, double degree1, double degree2) { PointF centerPoint = new PointF ( rectangle.X + rectangle.Width / 2f, rectangle.Y + rectangle.Height / 2f ); float distance = rectangle.Width + rectangle.Height; double radian1 = degree1 * Math.PI / 180; PointF point1 = new PointF ( (float)(centerPoint.X + distance * Math.Cos(radian1)), (float)(centerPoint.Y + distance * Math.Sin(radian1)) ); double radian2 = degree2 * Math.PI / 180; PointF point2 = new PointF ( (float)(centerPoint.X + distance * Math.Cos(radian2)), (float)(centerPoint.Y + distance * Math.Sin(radian2)) ); PointF[] intersectionPointArray1 = FindEllipseSegmentIntersectionPointArray ( rectangle, centerPoint, point1, true ); PointF[] intersectionPointArray2 = FindEllipseSegmentIntersectionPointArray ( rectangle, centerPoint, point2, true ); return new PointF[] { intersectionPointArray1[0], intersectionPointArray2[0] }; } #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 아크 파트 구하기 - GetArcPart(arcRectangle, startPoint, endPoint, targetPoint, radius) /// <summary> /// 아크 파트 구하기 /// </summary> /// <param name="arcRectangle">아크 사각형</param> /// <param name="startPoint">시작 포인트</param> /// <param name="endPoint">종료 포인트</param> /// <param name="targetPoint">타겟 포인트</param> /// <param name="radius">반경</param> /// <returns>아크 파트</returns> public ArcPart GetArcPart(RectangleF arcRectangle, PointF startPoint, PointF endPoint, Point targetPoint, float radius) { if(GetDistance(targetPoint, startPoint) < radius) { return ArcPart.StartPoint; } if(GetDistance(targetPoint, endPoint) < radius) { return ArcPart.EndPoint; } float centerX = (arcRectangle.Left + arcRectangle.Right ) / 2f; float centerY = (arcRectangle.Top + arcRectangle.Bottom) / 2f; float deltaX = targetPoint.X - centerX; float deltaY = targetPoint.Y - centerY; float radian = (float)Math.Atan2(deltaY, deltaX); float degree = (float)(radian * 180 / Math.PI); while(degree < 0) { degree += 360; } if((degree < startAngle) || (degree > startAngle + sweepAngle)) { return ArcPart.None; } PointF centerPoint = new PointF(centerX, centerY); PointF[] intersectionPointArray = FindEllipseSegmentIntersectionPointArray(arcRectangle, centerPoint, targetPoint, false); for(int i = 0; i < intersectionPointArray.Length; i++) { if(GetDistance(targetPoint, intersectionPointArray[i]) < radius) { return ArcPart.Body; } } return ArcPart.None; } #endregion } } |
