BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  History Function in Photoshop?          BorlandTalk.com Forum Index -> Delphi Graphics View previous topic :: View next topic   Author Message Ma Xiaoguang Guest Posted: Wed Aug 10, 2005 8:05 am    Post subject: History Function in Photoshop? Dear ladies and gentlemen, I am just curious about the History function which was in Photoshop. Photoshop could saves every operation from the user in the History dialog. I think that it could have a list in Photoshop to save the data of every operation on it. The wonderful thing is that user could deletes any step they made in the History dialog, the Photoshop will then composite the remaining operating steps to produce a proper result. So cool, isn't it? How can the Photoshop achieve this? What is the principle about the History function? The History function is better than the Undo/Redo function, as far as I am concern. I think that the technique of the History function is very hard, maybe I cannot to understand and handle it. But I still expect someone who could explain this technique to me. Thank you very much! Best regards. Xiaoguang Back to top Lars Frische Guest Posted: Wed Aug 10, 2005 2:50 pm    Post subject: Re: History Function in Photoshop? Ma Xiaoguang wrote: Quote: Dear ladies and gentlemen, I am just curious about the History function which was in Photoshop. Photoshop could saves every operation from the user in the History dialog. I think that it could have a list in Photoshop to save the data of every operation on it. The wonderful thing is that user could deletes any step they made in the History dialog, the Photoshop will then composite the remaining operating steps to produce a proper result. So cool, isn't it? How can the Photoshop achieve this? What is the principle about the History function? The History function is better than the Undo/Redo function, as far as I am concern. I think that the technique of the History function is very hard, maybe I cannot to understand and handle it. But I still expect someone who could explain this technique to me. Thank you very much! Best regards. Xiaoguang Hello Xiaoguang, Usually this is being done using the Command Pattern. It is describe in the Gof pattern book: Gamma, E., Helm, R., Johnson, R., Vlissides, J. Design Patterns: Elements of Reusable Object-Oriented Software Addison Wesley, 1995 You should be able to find a delphi implementation using google. Cheers Lars. -- Lars Frische Software Developer Test Maschinen Technik GmbH Germany === http://www.eddyMax.com http://www.kontrolltechnik.com Back to top Ma Xiaoguang Guest Posted: Thu Aug 11, 2005 8:02 am    Post subject: Re: History Function in Photoshop? Hello MikKi, Thanks for your help. This technique is really complicated. As you said, we should to standardize our code, it is a challenge to me. Thanks for your explanation for the question. Best regards. Xiaoguang "Miklós Kiss" <kissmiklos (AT) freemail (DOT) hu> wrote Quote: Hello, I am just curious about the History function which was in Photoshop. Photoshop could saves every operation from the user in the History dialog. I think that it could have a list in Photoshop to save the data of every operation on it. The wonderful thing is that user could deletes any step they made in the History dialog, the Photoshop will then composite the remaining operating steps to produce a proper result. So cool, isn't it? How can the Photoshop achieve this? What is the principle about the History function? The History function is better than the Undo/Redo function, as far as I am concern. I think that the technique of the History function is very hard, maybe I cannot to understand and handle it. But I still expect someone who could explain this technique to me. I never did such thing but if I had to do it I would do the followings: - first: every operation should have an own structure (class?) which describes exactly what modification on the image are needed - second: I would create "reference images" (at least one with the starting image) - third: store the list of modifications between reference images maintaining their original order So when doing this you can always recreate the resulting image from the first reference image by applying the modifications in the *exact* order they were made. Also operation order can be changed and operations can be added/removed too. Note that the reference images are not needed (except for the first one) but if they are present they can speed up the recreation of the result image (e.g.: you have 6 operations and 2 reference images: one for the start and one created after the 3rd operation. So if you delete the 5th operation you only have to redo the 4th and 6th operations from the 2nd reference image. However if you only have the starting image you must redo 5 operations which can last very long). But be warned: creating too much reference images will eat up memory if images are "big". Regards, MikKi Back to top Ma Xiaoguang Guest Posted: Thu Aug 11, 2005 8:05 am    Post subject: Re: History Function in Photoshop? Hello Lars, Thanks for your help. Best regards. Xiaoguang "Lars Frische" <nospam (AT) eddymax (DOT) com> wrote Quote: Ma Xiaoguang wrote: Dear ladies and gentlemen, I am just curious about the History function which was in Photoshop. Photoshop could saves every operation from the user in the History dialog. I think that it could have a list in Photoshop to save the data of every operation on it. The wonderful thing is that user could deletes any step they made in the History dialog, the Photoshop will then composite the remaining operating steps to produce a proper result. So cool, isn't it? How can the Photoshop achieve this? What is the principle about the History function? The History function is better than the Undo/Redo function, as far as I am concern. I think that the technique of the History function is very hard, maybe I cannot to understand and handle it. But I still expect someone who could explain this technique to me. Thank you very much! Best regards. Xiaoguang Hello Xiaoguang, Usually this is being done using the Command Pattern. It is describe in the Gof pattern book: Gamma, E., Helm, R., Johnson, R., Vlissides, J. Design Patterns: Elements of Reusable Object-Oriented Software Addison Wesley, 1995 You should be able to find a delphi implementation using google. Cheers Lars. -- Lars Frische Software Developer Test Maschinen Technik GmbH Germany === http://www.eddyMax.com http://www.kontrolltechnik.com Back to top Mr. X Guest Posted: Thu Aug 11, 2005 1:48 pm    Post subject: Re: History Function in Photoshop? Hi Ma The history is actually a list of undo and redo in a way. Yes, if you want to go to a particular index in the history list, you can just call the state of your image at that index. If you want to use re-usable objects then implementing this would be quite complex. "Ma Xiaoguang" <maxiaoguang10000 (AT) sina (DOT) com> wrote Quote: Dear ladies and gentlemen, I am just curious about the History function which was in Photoshop. Photoshop could saves every operation from the user in the History dialog. I think that it could have a list in Photoshop to save the data of every operation on it. The wonderful thing is that user could deletes any step they made in the History dialog, the Photoshop will then composite the remaining operating steps to produce a proper result. So cool, isn't it? How can the Photoshop achieve this? What is the principle about the History function? The History function is better than the Undo/Redo function, as far as I am concern. I think that the technique of the History function is very hard, maybe I cannot to understand and handle it. But I still expect someone who could explain this technique to me. Thank you very much! Best regards. Xiaoguang Back to top Ma Xiaoguang Guest Posted: Fri Aug 12, 2005 7:52 am    Post subject: Re: History Function in Photoshop? Hello Mr. X, Thanks for your help. Yes, this is really complicated task. Best regards. Xiaoguang "Mr. X" <no (AT) mail (DOT) here> wrote Quote: Hi Ma The history is actually a list of undo and redo in a way. Yes, if you want to go to a particular index in the history list, you can just call the state of your image at that index. If you want to use re-usable objects then implementing this would be quite complex. "Ma Xiaoguang" <maxiaoguang10000 (AT) sina (DOT) com> wrote in message news:42f9b525 (AT) newsgroups (DOT) borland.com... Dear ladies and gentlemen, I am just curious about the History function which was in Photoshop. Photoshop could saves every operation from the user in the History dialog. I think that it could have a list in Photoshop to save the data of every operation on it. The wonderful thing is that user could deletes any step they made in the History dialog, the Photoshop will then composite the remaining operating steps to produce a proper result. So cool, isn't it? How can the Photoshop achieve this? What is the principle about the History function? The History function is better than the Undo/Redo function, as far as I am concern. I think that the technique of the History function is very hard, maybe I cannot to understand and handle it. But I still expect someone who could explain this technique to me. Thank you very much! Best regards. 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