public void DrawSinCurbe()
"
      Point firstPoint = new Point(50, 50);//描き始め
      Point secondPoint = new Point(350, firstPoint.Y);//描き終わり
      bool smoothSet = false;//false:通常描画　true:円滑描画
      Font font = new Font("Times New Roman", 10f);//フォント設定
      Bitmap imgBitmap = new Bitmap(600, 600); //PictureBoxのサイズ
      pictureBox.Image = imgBitmap;
      Pen drawPen = new Pen(Color.Black, 0.1f);//描く線のPen設定
      Brush brush = new SolidBrush(Color.Black);//文字色
      Graphics grf = Graphics.FromImage(pictureBox.Image);

      Bitmap sinBmp = SetSinCurve(drawPen,firstPoint,secondPoint,smoothSet);

      grf.DrawString("通常描画", font, brush, 60f, 20f);
      grf.DrawImage(sinBmp, 10, 10);
      //円滑描画設定
      firstPoint = new Point(50 * 100, 50 * 100);//各値を100倍
      secondPoint = new Point(350 * 100, firstPoint.Y);//各値を100倍
      smoothSet = true;

     sinBmp = SetSinCurve(drawPen,firstPoint, secondPoint,smoothSet);

      grf.DrawString("円滑描画", font, brush, 60ｆ, 90f);
      grf.DrawImage (sinBmp, 10, 80);
      grf.Dispose();
"
　　　//linePen:描く線の色
　　　//startPoint:曲線の描き始め
　　　//endPoint:曲線の描き終わり
　　　//smooth://false:通常描画　true:円滑描画
  public Bitmap SetSinCurve(Pen linePen, Point startPoint, Point endPoint,bool smooth)
"
      double width = endPoint.X - startPoint.X;
      double amplitude = width / 20; // 振幅
      double resolution = 200; // 点の数
      Point[] curvePoints = new Point[(int)resolution + 1];//サインカーブPoint配列
      Bitmap bitmap = new Bitmap((int)(width * 2), (int)(amplitude * 5));
      Graphics g = Graphics.FromImage(bitmap);
      g.PageUnit = GraphicsUnit.Pixel;
      if (smooth) { g.PageScale = 0.01f; }//円滑描画時1/100スケール
      g.SmoothingMode = SmoothingMode.HighQuality;
      //サインカーブ計算
      for (int i = 0; i <= resolution; i++)
    "
          double t = (double)i / resolution;
          double x = startPoint.X + t * width;
          double y = startPoint.Y + Math.Sin(-t * 2 * Math.PI) * amplitude;
          curvePoints[i] = new Point((int)x, (int)y);//配列に代入
    "
      g.DrawLines(linePen, curvePoints);
      g.Dispose();
      return bitmap;
"