Question on changing photo size in smcoxon's code on "Resize Images on upload" RSS

• • Reply
  

  janwane

  Member

  79 Points

  152 Posts

  Question on changing photo size in smcoxon's code on "Resize Images on upload"

  Dec 14, 2012 01:30 PM|LINK

  //New image target width
  const int bmpW = 300;
  //New Image target height
  const int bmpH = 225;
  //Use the uploaded filename for saving without the '.' extension
  String upName = fu.FileName.Substring(0, fu.FileName.IndexOf("."));
  //Set the save path of the resized image, you will need this directory already created in your web site
  string newName = Request.QueryString["TailNum"].ToString() + "_" + upName + ".jpg";
  string bigName = Request.QueryString["TailNum"].ToString() + "_" + upName + "Big.jpg";
  string filePath = "~\\HR\\AcftInspPhotos\\" + newName;
  string filePathBig = "~\\HR\\AcftInspPhotos\\" + bigName;
  DirectoryInfo dirInfoEx = new DirectoryInfo(@csPath);
  System.IO.FileInfo[] fileNamesEx = dirInfoEx.GetFiles(newName);
  if (fileNamesEx.GetLength(0) == 0)
  {
      //First save full size file
      fu.SaveAs(MapPath(filePathBig));
  
      Int32 newWidth = bmpW;
      Int32 newHeight = bmpH;
      //Create a new Bitmap using the uploaded picture as a Stream
      //Set the new bitmap resolution to 72 pixels per inch
      Bitmap upBmp = (Bitmap)Bitmap.FromStream(fu.PostedFile.InputStream);
      Bitmap newBmp = new Bitmap(newWidth, newHeight, System.Drawing.Imaging.PixelFormat.Format24bppRgb);
      newBmp.SetResolution(72, 72);
      //Get the uploaded image width and height
      Double upWidth = upBmp.Width;
      Double upHeight = upBmp.Height;
      int newX = 0;
      //Set the new top left drawing position on the image canvas
      int newY = 0;
      Double reDuce;
      //Keep the aspect ratio of image the same if not 4:3 and work out the newX and newY positions
      //to ensure the image is always in the centre of the canvas vertically and horizontally
      if (upWidth > upHeight)
      {
          //Landscape picture
          reDuce = newWidth / upWidth;
          //calculate the width percentage reduction as decimal
          newHeight = ((Int32)(upHeight * reDuce));
          //reduce the uploaded image height by the reduce amount
          newY = ((Int32)((bmpH - newHeight) / 2));
          //Position the image centrally down the canvas
          newX = 0;
          //Picture will be full width
      }
      else if (upWidth < upHeight)
      {
          //Portrait picture
          reDuce = newHeight / upHeight;
          //calculate the height percentage reduction as decimal
          newWidth = ((Int32)(upWidth * reDuce));
          //reduce the uploaded image height by the reduce amount
          newX = ((Int32)((bmpW - newWidth) / 2));
          //Position the image centrally across the canvas
          newY = 0;
          //Picture will be full hieght
      }
      else if (upWidth == upHeight)
      {
          //square picture
          reDuce = newHeight / upHeight;
          //calculate the height percentage reduction as decimal
          newWidth = ((Int32)(upWidth * reDuce));
          //reduce the uploaded image height by the reduce amount
          newX = ((Int32)((bmpW - newWidth) / 2));
          //Position the image centrally across the canvas
          newY = ((Int32)((bmpH - newHeight) / 2));
          //Position the image centrally down the canvas
      }
      //Create a new image from the uploaded picture using the Graphics class
      //Clear the graphic and set the background colour to white
      //Use Antialias and High Quality Bicubic to maintain a good quality picture
      //Save the new bitmap image using 'Png' picture format and the calculated canvas positioning
      Graphics newGraphic = Graphics.FromImage(newBmp);
      try
      {
          newGraphic.Clear(Color.White);
          newGraphic.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
          newGraphic.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
          newGraphic.DrawImage(upBmp, newX, newY, newWidth, newHeight);
          newBmp.Save(MapPath(filePath), System.Drawing.Imaging.ImageFormat.Jpeg);
          //Show the uploaded resized picture in the image control
  
          //validate file was uploaded successfully
          DirectoryInfo dirInfo = new DirectoryInfo(@csPath);
          System.IO.FileInfo[] fileNames = dirInfo.GetFiles(newName);
          foreach (System.IO.FileInfo fi in fileNames)
          {
              SDS_DiscrepPhotos.InsertParameters["DefID"].DefaultValue = csDefID;
              SDS_DiscrepPhotos.InsertParameters["PhotoFN"].DefaultValue = newName;
              SDS_DiscrepPhotos.InsertParameters["PhotoBigFN"].DefaultValue = bigName;
              SDS_DiscrepPhotos.InsertParameters["PhotoLegend"].DefaultValue = ((TextBox)gvr.FindControl("TextBox_Legend")).Text;
              SDS_DiscrepPhotos.Insert();
              bPicsUploaded = true;
          }
      }

  
  Several months ago I found and used smcoxon's code from http://forums.asp.net/t/1085119.aspx/1/10 (C# version) successfully on an app for aircraft inspectors to upload photos of discrepancies providing both a thumbnail and a larger picture.  However, I'm now getting complaints that the "full size" photos are too "granular".  In inspecting the code (and reviewing ALL the original post) I see the original requirement was for a limited "full size" not the actual full size.  I have found 3 lines that have to do with size but I'm afraid to change any of it!  My requirement is this: upload photo file, resize to thumbnail (this size is fine) plus file the original photo file.  Exactly what do I change to accomplish that without making a mess?!