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 Best way to rotate images?
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skippix

USA
68 Posts

Posted - Sep 16 2022 :  08:34:11  Show Profile  Reply
Even though I have EnableAdjustOrientation := True for my TImageMView grid, not all the images are properly oriented.

At the moment, I have a function that allows the user to rotate one/some/all the images in the grid (this function actually rotates the file).

My problem is that I have to reload the entire grid. Is there a way to simply rotate the grid thumbnails without having to reload the grid?

Thanks!
Skip

xequte

7215 Posts

Posted - Sep 16 2022 :  17:15:20  Show Profile  Reply
Hi Skip

EnableAdjustOrientation uses the EXIF data to know whether the image needs to be rotated. If an image does not include the data, it cannot be automatically rotated.

What method are you using to rotate images in the grid?

Nigel
Xequte Software
www.imageen.com
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skippix

USA
68 Posts

Posted - Sep 16 2022 :  21:56:42  Show Profile  Reply
My apologies, I just re-read my question and realize I was not clear.

I have a function that rotates the actual file. I am asking if there is a way to update the grid to show the rotation without having to reload the entire grid? If this isn't clear, I'll create an illustration to show what I'm trying to do.
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xequte

7215 Posts

Posted - Sep 19 2022 :  03:19:43  Show Profile  Reply
Hi

To update just a single image, use:

http://www.imageen.com/help/TImageEnMView.UpdateImage.html


Nigel
Xequte Software
www.imageen.com
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skippix

USA
68 Posts

Posted - Sep 19 2022 :  04:46:28  Show Profile  Reply
Thanks, Nigel! That works perfectly for a single image.

I'm not quite sure about multiple images, though.

I have two lists, one of files to rotate and one of their grid indices. When I use the following code with multiple images selected, the grid only updates the last one on the list.


  for i := 0 to slFilesToRotate.Count-1 do
    begin
      if (TMenuItem(Sender).Tag = 0) then
        RotateThisJPeg270 (slFilesToRotate[i])
      else
        RotateThisJPeg (slFilesToRotate[i]);

      x := StrToInt(slRotatedFileIndexes[i]);
      imgGrid.UpdateImage(x);
    end;


When I embed the above code between imgGrid.LockUpdate and imgGrid.UnlockUpdate, the grid temporarily blanks out. Even though it works, it's not very pretty.

Any ideas as to how I can improve this?

Thanks!

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xequte

7215 Posts

Posted - Sep 21 2022 :  20:40:27  Show Profile  Reply
Hi

If your RotateThisJpeg() code uses ImageEnMView.Proc, you should not call UpdateImage() as it will occur internally.

Nigel
Xequte Software
www.imageen.com
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