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   1: private bool m_img_loaded = false;

   2: private string m_img_filename = "";

   3: private Image<Bgr, byte> m_img = null;               // 載入圖片

   4: private Image<Bgr, byte> m_img_cpy = null;           // 載入圖片備份 

   5:  

   6: private Point RectStartPoint;                         // imageBoxInput's ROI 起始點 (picture coordinates)

   7: private Rectangle Rect = new Rectangle();             // imageBoxInput's ROI (picture coordinates)

   8: private Rectangle RealImageRect = new Rectangle();    // imageBoxOuputROI's ROI (image coordinates)  

   9: private Brush selectionBrush = new SolidBrush(Color.FromArgb(128, 64, 64, 64)); // 128: 透明度

  10: private int thickness = 5;

   1: private void loadToolStripMenuItem_Click(object sender, EventArgs e)

   2:  {

   3:      using(OpenFileDialog ofd = new OpenFileDialog())

   4:      {

   5:          if (ofd.ShowDialog() == DialogResult.OK)

   6:          {

   7:              m_img_filename = ofd.FileName;

   8:              m_img = new Image<Bgr, byte>(m_img_filename);

   9:              m_img_cpy = m_img.Clone();

  10:              imageBoxOutputROI.Image = imageBoxInput.Image = m_img;

  11:              m_img_loaded = true;

  12:          }

  13:      }

  14:  }

   1: class Utilities

   2:     {

   3:         /* Picture to image coordinates transformation

   4:          * 輸入 picture coordinates (xp, yp)

   5:          * 輸出 image coordinates (xi, yi)

   6:          */

   7:         public static void ConvertCoordinates(PictureBox pic,

   8:             out int xi, out int yi, int xp, int yp)

   9:         {

  10:             int pic_hgt = pic.ClientSize.Height;

  11:             int pic_wid = pic.ClientSize.Width;

  12:             int img_hgt = pic.Image.Height;

  13:             int img_wid = pic.Image.Width;

  14:  

  15:             xi = xp;

  16:             yi = yp;

  17:             switch (pic.SizeMode)

  18:             {

  19:                 case PictureBoxSizeMode.AutoSize:

  20:                     break;

  21:                 case PictureBoxSizeMode.Normal:

  22:                     break;

  23:                 case PictureBoxSizeMode.CenterImage:

  24:                     xi = xp - (pic_wid - img_wid) / 2;

  25:                     yi = yp - (pic_hgt - img_hgt) / 2;

  26:                     break;

  27:                 case PictureBoxSizeMode.StretchImage:      // 目前使用中

  28:                     // image coordinates(xi, yi),  picture coordinates(xp, yp)

  29:                     xi = (int)(img_wid * xp / (float)pic_wid);

  30:                     yi = (int)(img_hgt * yp / (float)pic_hgt);

  31:                     break;

  32:                 case PictureBoxSizeMode.Zoom:

  33:                     float pic_aspect = pic_wid / (float)pic_hgt;

  34:                     float img_aspect = img_wid / (float)img_wid;

  35:                     if (pic_aspect > img_aspect)

  36:                     {

  37:                         // The PictureBox is wider/shorter than the image.

  38:                         yi = (int)(img_hgt * yp / (float)pic_hgt);

  39:  

  40:                         // The image fills the height of the PictureBox.

  41:                         // Get its width.

  42:                         float scaled_width = img_wid * pic_hgt / img_hgt;

  43:                         float dx = (pic_wid - scaled_width) / 2;

  44:                         xi = (int)((xp - dx) * img_hgt / (float)pic_hgt);

  45:                     }

  46:                     else

  47:                     {

  48:                         // The PictureBox is taller/thinner than the image.

  49:                         xi = (int)(img_wid * xp / (float)pic_wid);

  50:  

  51:                         // The image fills the height of the PictureBox.

  52:                         // Get its height.

  53:                         float scaled_height = img_hgt * pic_wid / img_wid;

  54:                         float dy = (pic_hgt - scaled_height) / 2;

  55:                         yi = (int)((yp - dy) * img_wid / pic_wid);

  56:                     }

  57:                     break;

  58:             }

  59:         }

  60:     }

   1: private void imageBoxInput_MouseDown(object sender, MouseEventArgs e)

   2:   {

   3:       RectStartPoint = e.Location;

   4:       Invalidate();

   5:   }

   1: private void imageBoxInput_MouseMove(object sender, MouseEventArgs e)

   2:     {

   3:         if (!m_img_loaded) return;

   4:         #region 設定imageBoxInput's Rect感興趣座標(picture coordinates), SETS COORDINATES AT INPUT IMAGE BOX

   5:         int X0, Y0;

   6:         /* 滑鼠座標: picture coordinates(e.X, e.Y) 

   7:          * 影像座標: image coordinates(X0, Y0)

   8:          */

   9:         Utilities.ConvertCoordinates(imageBoxInput, out X0, out Y0, e.X, e.Y);

  10:         labelPostionXY.Text = "影像座標: X:" + X0.ToString() + "  Y:" + Y0.ToString();

  11:         labelPicPosXY.Text = "圖片座標: X:" + e.X.ToString() + "  Y:" + e.Y.ToString();

  12:         //Coordinates at input picture box

  13:         if (e.Button != MouseButtons.Left)   // 如果移動中同時按下左鍵繼續往下, 否則離開

  14:             return;

  15:         Point tempEndPoint = e.Location;

  16:         // ROI左上角座標 (picture coordinates)

  17:         Rect.Location = new Point(

  18:             Math.Min(RectStartPoint.X, tempEndPoint.X),

  19:             Math.Min(RectStartPoint.Y, tempEndPoint.Y));

  20:         // ROI寬度和高度 (picture coordinates)

  21:         Rect.Size = new Size(

  22:             Math.Abs(RectStartPoint.X - tempEndPoint.X),

  23:             Math.Abs(RectStartPoint.Y - tempEndPoint.Y));

  24:         #endregion

  25:         #region 設定imageBoxOutputROI's RealImageRect感興趣座標(image coordinates), SETS COORDINATES AT REAL IMAGE

  26:         /*  (1) picture coordinates: RectStartPoint.X, RectStartPoint.Y

  27:          *      image coordinates: X0, Y0

  28:          *  (2) picture coordinates: tempEndPoint.X, tempEndPoint.Y

  29:          *      image coordinates: X1, Y1

  30:          */

  31:         //Coordinates at real image - Create ROI

  32:         Utilities.ConvertCoordinates(imageBoxInput, out X0, out Y0, RectStartPoint.X, RectStartPoint.Y);

  33:         int X1, Y1;

  34:         Utilities.ConvertCoordinates(imageBoxInput, out X1, out Y1, tempEndPoint.X, tempEndPoint.Y);

  35:         RealImageRect.Location = new Point(

  36:             Math.Min(X0, X1),

  37:             Math.Min(Y0, Y1));

  38:         RealImageRect.Size = new Size(

  39:             Math.Abs(X0 - X1),

  40:             Math.Abs(Y0 - Y1));

  41:         m_img_cpy.ROI = System.Drawing.Rectangle.Empty;

  42:         m_img = m_img_cpy.Clone();

  43:         m_img.Draw(RealImageRect, new Bgr(Color.White), thickness);   // 在image上繪製ROI, 並顯示在imageBoxOutputROI

  44:         imageBoxOutputROI.Image = m_img;

  45:   

  46:         #endregion

  47:         ((PictureBox)sender).Invalidate();

  48:     }

   1: private void imageBoxInput_MouseUp(object sender, MouseEventArgs e)

   2: {

   3:     if (!m_img_loaded) return;

   4:     //Define ROI. Valida altura e largura para evitar index range exception.

   5:     if (RealImageRect.Width > 0 && RealImageRect.Height > 0)

   6:     {

   7:         m_img_cpy.ROI = RealImageRect;

   8:         imageBoxROI.Image = m_img_cpy;

   9:     }

  10: }

   1: private void imageBoxInput_Paint(object sender, PaintEventArgs e)

   2: {

   3:     //if (!m_img_loaded) return;

   4:     // Draw the rectangle...

   5:     if (imageBoxInput.Image != null)

   6:     {

   7:         if (Rect != null && Rect.Width > 0 && Rect.Height > 0)

   8:         {

   9:             //Seleciona a ROI

  10:             e.Graphics.SetClip(Rect, System.Drawing.Drawing2D.CombineMode.Exclude);

  11:             e.Graphics.FillRectangle(selectionBrush, new Rectangle(0, 0, ((PictureBox)sender).Width, ((PictureBox)sender).Height));

  12:             //e.Graphics.FillRectangle(selectionBrush, Rect);

  13:         }

  14:     }

  15: }

   1: private void imageBoxInput_DoubleClick(object sender, EventArgs e)

   2: {

   3:     Rect = new Rectangle();

   4:     ((PictureBox)sender).Invalidate();

   5: }