■ 장미 곡선(Rose Curve)을 그리는 방법을 보여준다.
▶ 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 { //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor ////////////////////////////////////////////////////////////////////////////////////////// Public #region 생성자 - MainForm() /// <summary> /// 생성자 /// </summary> public MainForm() { InitializeComponent(); #region 이벤트를 설정한다. this.drawButton.Click += drawButton_Click; #endregion } #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) { float a = float.Parse(this.aTextBox.Text); int n = int.Parse(this.nTextBox.Text); int d = int.Parse(this.dTextBox.Text); Bitmap bitmap = new Bitmap ( this.canvasPictureBox.ClientSize.Width, this.canvasPictureBox.ClientSize.Height ); using(Graphics graphics = Graphics.FromImage(bitmap)) { graphics.Clear(Color.White); graphics.SmoothingMode = SmoothingMode.AntiAlias; RectangleF rectangle = new RectangleF ( -a - 0.1f, -a - 0.1f, 2 * a + 0.2f, 2 * a + 0.2f ); PointF[] pointArray = { new PointF(0, bitmap.Height), new PointF(bitmap.Width, bitmap.Height), new PointF(0, 0), }; graphics.Transform = new Matrix(rectangle, pointArray); DrawCurve(graphics, a, n, d); DrawAxes(graphics, rectangle.Right); this.canvasPictureBox.Image = bitmap; } } #endregion //////////////////////////////////////////////////////////////////////////////// Function #region 곡선 그리기 - DrawCurve(graphics, a, n, d) /// <summary> /// 곡선 그리기 /// </summary> /// <param name="graphics">그래픽스</param> /// <param name="a">A</param> /// <param name="n">N</param> /// <param name="d">D</param> private void DrawCurve(Graphics graphics, float a, int n, int d) { const int pointCount = 1000; double period = Math.PI * d; if((n % 2 == 0) || (d % 2 == 0)) { period *= 2; } double dtheta = period / pointCount; List<PointF> pointList = new List<PointF>(); double k = (double)n / d; for(int i = 0; i < pointCount; i++) { double theta = i * dtheta; double r = a * Math.Cos(k * theta); float x = (float)(r * Math.Cos(theta)); float y = (float)(r * Math.Sin(theta)); pointList.Add(new PointF(x, y)); } graphics.FillPolygon(Brushes.LightBlue, pointList.ToArray()); using(Pen pen = new Pen(Color.Red, 0)) { graphics.DrawLines(pen, pointList.ToArray()); } } #endregion #region 축 그리기 - DrawAxes(graphics, worldMaximumX) /// <summary> /// 축 그리기 /// </summary> /// <param name="graphics">그래픽스</param> /// <param name="worldMaximumX">월드 최대 X</param> private void DrawAxes(Graphics graphics, float worldMaximumX) { int maximumX = (int)worldMaximumX; using(Pen pen = new Pen(Color.Black, 0)) { graphics.DrawLine(pen, -worldMaximumX, 0 , worldMaximumX, 0 ); graphics.DrawLine(pen, 0 , -worldMaximumX, 0 , worldMaximumX); float tic = 0.1f; for(int x = -maximumX; x <= maximumX; x++) { graphics.DrawLine(pen, x , -tic, x , tic); graphics.DrawLine(pen, -tic, x , tic, x ); } } } #endregion } } |
