C#图片查看器

1. 
   
   1. using System;
   2. using System.Collections.Generic;
   3. using System.Text;
   4. using System.Windows.Forms;
   5. using System.Drawing;
   6. using System.IO;
   7. using System.Drawing.Design;
   9. namespace 图片查看
   10. {
   11.      #region 展示大图
   12.      class ShowPicture
   13.      {      
   15.         #region 缩放图片尺寸
   17.         /// <summary>
   18.          /// 按原始比例缩放图片的高和宽，并且使高小于等于MAX_Y，宽小于等于MAX_X
   19.         /// </summary>
   20.         /// <param name="x">图片的宽</param>
   21.         /// <param name="y">图片的高</param>
   22.          /// <param name="MAX_X">PictureBox的高</param>
   23.         /// <param name="MAX_Y">PictureBox的宽</param>
   24.          /// <returns></returns>
   25.          private static Size Zoom(double x, double y,int MAX_X,int MAX_Y)
   26.         {
   27.             double SCALE = x / y;
   28.             if (x > MAX_X || y > MAX_Y) //修正原来的与运算符
   29.             {
   30.                 if (x > y)
   31.                 {
   32.                     for (x = MAX_X; ; )
   33.                     {
   34.                          y = x / SCALE;
   35.                          if (y <= MAX_Y)
   36.                              break;
   37.                          else
   38.                              x--;
   39.                      }
   40.                  }
   41.                  else
   42.                  {
   43.                      for (y = MAX_Y; ; )
   44.                      {
   45.                          x = SCALE * y;
   46.                          if (x <= MAX_X)
   47.                              break;
   48.                          else
   49.                              y--;
   50.                      }
   51.                  }
   52.              }
   53.              return new Size((int)x, (int)y);
   54.          }
   56.          #endregion
   58.         
   60.          /// <summary>
   61.          /// 在新窗体中展示大图
   62.          /// 2008-10-26修改
   63.          /// </summary>       
   64.          /// <param name="image">图片</param>
   65.          public static void Show(Image OriginalImage)
   66.          {
   67.              if (OriginalImage != null)
   68.              {
   69.                  Form showPicture = new Form();
   70.                  showPicture.BackColor = Color.Snow;
   71.                  showPicture.Text = "图片查看器";               
   72.                  showPicture.WindowState = FormWindowState.Maximized;
   73.                  PictureBox 图片_show_pictureBox = new PictureBox();
   74.                  
   75.                  图片_show_pictureBox.BackColor = Color.Black;
   76.                  图片_show_pictureBox.BorderStyle = BorderStyle.FixedSingle;
   77.                  图片_show_pictureBox.Size = Zoom(OriginalImage.Width, OriginalImage.Height,900,675);
   78.                  图片_show_pictureBox.Image = OriginalImage;
   79.                  图片_show_pictureBox.SizeMode = PictureBoxSizeMode.StretchImage;
   80.                  图片_show_pictureBox.Location = new Point((1024 - 图片_show_pictureBox.Size.Width )/ 2, (675 - 图片_show_pictureBox.Size.Height) / 2);
   81.                  showPicture.Controls.Add(图片_show_pictureBox);
   82.                  //图片_show_pictureBox.Anchor = AnchorStyles.Bottom | AnchorStyles.Left | AnchorStyles.Right | AnchorStyles.Top;//自动随窗体大小变化
   83.                  showPicture.ShowDialog();
   84.                  GC.Collect();
   85.              }
   86.          }
   88.          #endregion
   89.      }
   90.      #endregion
   91.  }