BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  How can I crop non-rectangle region of bitmap?          BorlandTalk.com Forum Index -> Delphi Graphics View previous topic :: View next topic   Author Message Byungho Jeon Guest Posted: Mon Jun 21, 2004 5:05 am    Post subject: How can I crop non-rectangle region of bitmap? Hi all.. I want to cut non-rectangle region of bitmap!!! User select several point of bitmap, then cut it to new bitmap!! It seams like `extract out-line of picture`!!!(I don't know right graphics term!! teach me...please) What algorithm used to implementation it?? If you can, show me the example or releated link.. thank you for reading!! Back to top Peter Below (TeamB) Guest Posted: Mon Jun 21, 2004 6:09 pm    Post subject: Re: How can I crop non-rectangle region of bitmap? In article <40d66c76$1 (AT) newsgroups (DOT) borland.com>, Byungho Jeon wrote: Quote: I want to cut non-rectangle region of bitmap!!! User select several point of bitmap, then cut it to new bitmap!! It seams like `extract out-line of picture`!!!(I don't know right graphics term!! teach me...please) What algorithm used to implementation it?? If you can, show me the example or releated link.. You can do this by creating a clipping region from the polygon the user created. You start out with the points the user defined in an array of TPoint. From that you create a region, using the Windows.CreatePolygonRgn function. If the area on the target bitmap where the content of this polygon should end up is not in the same place as on the source bitmap you move this region to the proper coordinates using the OffsetRgn API function. Then use SelectClipRgn on the target bitmap.canvas.handle to establish the clipping region. You can now use the CopyRect method of the canvas to copy a rectangular area of the source bitmap to the target bitmaps canvas. All points outside the clipping region will not be changed by this operation. To clean up you call SelectClipRgn with 0 as handle on the bitmap.canvas.handle (this removes the clipping region) and call Windows.DeleteObject on the region handle. Search the newsgroup archives for the API functions mentioned to find examples of use. Also check Earl Glynns Delphi pages, he has quite a number of examples on graphics handling: Earl Glynns Delphi pages http://www.efg2.com/Lab/Library/Delphi http://homepages.borland.com/efg2lab Oh, you own the TeamB retirement fund $30 for excessive use of exclamation points in a newsgroup post (I counted 6 extras at $5 each). <g> -- Peter Below (TeamB) Use the newsgroup archives : http://www.mers.com/searchsite.html http://www.tamaracka.com/search.htm http://groups.google.com http://www.prolix.be Back to top Byungho Jeon Guest Posted: Tue Jun 22, 2004 6:07 am    Post subject: Re: How can I crop non-rectangle region of bitmap? "Peter Below (TeamB)" <100113.1101 (AT) compuXXserve (DOT) com> wrote Quote: In article <40d66c76$1 (AT) newsgroups (DOT) borland.com>, Byungho Jeon wrote: I want to cut non-rectangle region of bitmap!!! User select several point of bitmap, then cut it to new bitmap!! It seams like `extract out-line of picture`!!!(I don't know right graphics term!! teach me...please) What algorithm used to implementation it?? If you can, show me the example or releated link.. You can do this by creating a clipping region from the polygon the user created. You start out with the points the user defined in an array of TPoint. From that you create a region, using the Windows.CreatePolygonRgn function. If the area on the target bitmap where the content of this polygon should end up is not in the same place as on the source bitmap you move this region to the proper coordinates using the OffsetRgn API function. Then use SelectClipRgn on the target bitmap.canvas.handle to establish the clipping region. You can now use the CopyRect method of the canvas to copy a rectangular area of the source bitmap to the target bitmaps canvas. All points outside the clipping region will not be changed by this operation. To clean up you call SelectClipRgn with 0 as handle on the bitmap.canvas.handle (this removes the clipping region) and call Windows.DeleteObject on the region handle. Search the newsgroup archives for the API functions mentioned to find examples of use. Also check Earl Glynns Delphi pages, he has quite a number of examples on graphics handling: Earl Glynns Delphi pages http://www.efg2.com/Lab/Library/Delphi http://homepages.borland.com/efg2lab Oh, you own the TeamB retirement fund $30 for excessive use of exclamation points in a newsgroup post (I counted 6 extras at $5 each). <g -- Peter Below (TeamB) Use the newsgroup archives : http://www.mers.com/searchsite.html http://www.tamaracka.com/search.htm http://groups.google.com http://www.prolix.be ==> thank you for reply Peter!! I try to use your solution!! So.. What is mean this words.. "Oh, you own the TeamB retirement fund $30 for excessive use of exclamation points in a newsgroup post (I counted 6 extras at $5 each). <g>" Am I must pay TeamB retirement fund $30? Or just a joke? I don't understand exactly!! Regards Back to top Joris Van Damme Guest Posted: Tue Jun 22, 2004 9:47 am    Post subject: Re: How can I crop non-rectangle region of bitmap? "Byungho Jeon" <enlight (AT) netian (DOT) com> wrote Quote: So.. What is mean this words.. "Oh, you own the TeamB retirement fund $30 for excessive use of exclamation points in a newsgroup post (I counted 6 extras at $5 each). <g>" It's Peter's (very funny) way of saying that the exclamation marks aren't all that necessary. Now you also own AWare Systems at least $30 for overquoting (= quoting many dozens of lines, to only add a few of your own, which is regarded inefficient use of bandwidth, and does not make pleasent reading). <g> Quote: I don't understand exactly!! See that '<g>' appended to what Peter said? It is a 'joke marker'. Most people append it even if they do not mean things to actually be funny, though, but want to disarm you and don't want you to respond seriously. Above two <g>'s enable us nagging without you telling us we are, as does this one: <g>. If you'd like to read up on what exactly it is that makes us old-timers start nagging and appending '<g>', Google on 'netiquette'. You'll quickly see that it's not just about 'protocol', but also aids in ensuring efficient communication. Have a nice day, Joris Van Damme [email]info (AT) awaresystems (DOT) be[/email] http://www.awaresystems.be Download your free TIFF tag viewer for windows here: http://www.awaresystems.be/imaging/tiff/astifftagviewer.html Back to top Nils Haeck Guest Posted: Tue Jun 22, 2004 1:55 pm    Post subject: Re: How can I crop non-rectangle region of bitmap? Quote: ==> thank you for reply Peter!! I try to use your solution!! So.. What is mean this words.. "Oh, you own the TeamB retirement fund $30 for excessive use of exclamation points in a newsgroup post (I counted 6 extras at $5 each). <g>" Am I must pay TeamB retirement fund $30? Or just a joke? I don't understand exactly!! Regards Why don't you understand?????????? I understand it perfectly!!!!!!!!! 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