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nwscomps
185 Posts |
 Posted - Aug 09 2011 : 16:35:52
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Hello, is there any way to get an undo saved by imageEn into a TIEBitmap object without having to actually restore the undo in the imageenview component? What I want to do is to use a TIEBitmap from the Undo history as a feed for the ImageEnPaintEngine in order to emulate the photoshop history tool. If possible I should be able also to get the alpha channel of the undo.
Thanks for any answer.
Francesco Savastano
Nwscomps.com
Add-ons for the ImageEn Library |
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fab
1310 Posts |
Posted - Aug 10 2011 : 00:23:18
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Hello Francesco,
Undo/Redo is handled by TImageEnProc (not by TImageEnView that just embeds TImageEnProc), so you could attach a TImageEnProc to TIEBitmap, and use the Undo/Redo:
ImageEnProc.AttachedIEBitmap := yourBitmap;
Now you can call Undo/Redo and other related methods:
ImageEnProc.Undo(); |
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nwscomps
185 Posts |
Posted - Aug 10 2011 : 05:32:19
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Hi Fabrizio,
the problem is that I do not want to enable an undo history undo on a TIEBitmap, I just want to be able to retrieve the undo information from the history of a Timageenview (with embedded TImageenproc) and have it saved into a TIEBitmap. To explain better this is the scenario:
1) I have a Timageenview on a form with undo / redo capabilities enabled
2) Let's say I paint 5 times on the background layer
3) I want now to have access to the image stored in the undo at the position 2 in the history
4) I use this history image for my purposes (in my case a new painting)
So I am bound to the imageenview embedded imageenproc for the history. It is not useful to have a TIEBitmap with its own undo history in my case.
All what I look for is some method such as: Imageenview1.Proc.GetHistoryUndoAt(myPosition, myIEBitmap)
Also since the undo could be with alpha channel I would need the alpha channel as well. I hope it makes sense.
Francesco Savastano
Nwscomps.com
Add-ons for the ImageEn Library |
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fab
1310 Posts |
Posted - Aug 10 2011 : 06:08:36
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| There is only TImageEnProc.UndoAt, which allows to specify the saved image. Of course it replaces the currently attached TIEBitmap (and you can change it temporally to your new TIEBitmap destination). |
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nwscomps
185 Posts |
Posted - Aug 10 2011 : 10:33:49
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Hi Fabrizio, thanks for the answer. So if I do the following it will be ok?
imageenview1.proc.attachedIEBitmap := mybitmap;
try
imageenview1.proc.undoat(2);
finally
imageenview1.proc.AttachedImageEn := imageenview1;
end;
Also how do I check if the current undo is of type image, vector, selection or other?
Thanks
Francesco Savastano
Nwscomps.com
Add-ons for the ImageEn Library |
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fab
1310 Posts |
Posted - Aug 10 2011 : 14:44:33
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No, you have to create a new TImageEnProc, and use only AttachedIEBitmap:
MyImageEnProc.AttachedIEBitmap := myBitmap;
MyImageEnProc.UndoAt(2);
MyImageEnProc.AttachedIEBitmap := ImageEnView1.IEBitmap;
And do not use ImageEnView.Proc.
>Also how do I check if the current undo is of type image, vector, selection or other?
Look at TImageEnProc.UndoPeekAt method. |
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nwscomps
185 Posts |
Posted - Aug 10 2011 : 15:43:56
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I would expect that I can retrieve undo information from any undo history of any imageenproc, without necessarily having to undo / redo.
LEt's say I have an imageenview with selections and layers. Now I have moved layers and selections as well as applied different filters / corrections, every operation is registered in the imageenview's embedded imageenproc undo list, why can't I access this history and use its content? Why do I need to use a separate imageenproc? I guess the answer is this is the way it was developed, but this is the point maybe it is too restrictive?
Francesco Savastano
Nwscomps.com
Add-ons for the ImageEn Library |
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fab
1310 Posts |
Posted - Aug 11 2011 : 01:33:13
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>I would expect that I can retrieve undo information from any undo history of any
>imageenproc, without necessarily having to undo / redo.
This is exactly what UndoAt does (and AutoUndo is True).
>> Why do I need to use a separate imageenproc?
I don't know all your necessities (layers, etc...) and I proposed it to have clearer code. You can of course use also:
ImageEnView.Proc.AttachedIEBitmap := myBitmap;
ImageEnView.Proc.UndoAt(2);
ImageEnView.Proc.AttachedImageEn := ImageEnView;
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Getting an undo into a TIEBitmap object
