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dotnet drawing api : Clip image based on emf metafile
I'm trying to clip an image to an irregular shape. I've come across some advice from Bob Powell (http://groups.google.co.uk/group/microsoft.public.dotnet.framework.drawing/browse_thread/thread/86485270f7a57ede/dd79ef1988191326?lnk=st&q=cropping+or+extracting+ellipse+from+image&rnum=1&hl=en#dd79ef1988191326) that works nicely, but I'd like to replace the ellipse with a shape based on an emf file for the clip region. Can anyone point me in the right direction? Thanks Mark
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"Mark" <NoSpam@Thanks.com> wrote in message news:u%23RDgviwHHA.484@TK2MSFTNGP06.phx.gbl... > Hi, > > I'm trying to clip an image to an irregular shape. I've come across some > advice from Bob Powell > (http://groups.google.co.uk/group/microsoft.public.dotnet.framework.drawing/browse_thread/thread/86485270f7a57ede/dd79ef1988191326?lnk=st&q=cropping+or+extracting+ellipse+from+image&rnum=1&hl=en#dd79ef1988191326) > that works nicely, but I'd like to replace the ellipse with a shape based > on an emf file for the clip region. > > Can anyone point me in the right direction? I'm not sure if this is the ideal solution but you could draw the emf file to a bitmap and use that as a mask. [quoted text, click to view] > > Thanks > > Mark
Thanks for your reply Michael. Why not ideal? Unfortunately I'm stuck with
having to use emf files. My assumption was that as Bob Powell's solution used a GraphicsPath I could get the same from an emf file? Could you give any more details on your idea as I'm quite new at this? Thanks again. Mark [quoted text, click to view] "Michael C" <nospam@nospam.com> wrote in message
news:OQ$7otowHHA.4628@TK2MSFTNGP02.phx.gbl... > "Mark" <NoSpam@Thanks.com> wrote in message > news:u%23RDgviwHHA.484@TK2MSFTNGP06.phx.gbl... >> Hi, >> >> I'm trying to clip an image to an irregular shape. I've come across some >> advice from Bob Powell >> (http://groups.google.co.uk/group/microsoft.public.dotnet.framework.drawing/browse_thread/thread/86485270f7a57ede/dd79ef1988191326?lnk=st&q=cropping+or+extracting+ellipse+from+image&rnum=1&hl=en#dd79ef1988191326) >> that works nicely, but I'd like to replace the ellipse with a shape based >> on an emf file for the clip region. >> >> Can anyone point me in the right direction? > > I'm not sure if this is the ideal solution but you could draw the emf file > to a bitmap and use that as a mask. > > >> >> Thanks >> >> Mark > >
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"Mark" <NoSpam@Thanks.com> wrote in message news:ujBR9%23rwHHA.4736@TK2MSFTNGP04.phx.gbl... > Thanks for your reply Michael. Why not ideal? When I say not ideal I mean there might be a better method that I don't know about, such as converting an emf to a path. Then again my idea might be the only option seeing there have been no other replies. [quoted text, click to view] > Unfortunately I'm stuck with having to use emf files. My assumption was > that as Bob Powell's solution used a GraphicsPath I could get the same > from an emf file? > > Could you give any more details on your idea as I'm quite new at this? Assuming you start with a bitmap of 100x100 and want to set some areas to transparent based on an emf file (correct me if I'm wrong) try something like this: Create a second bitmap of 100x100 Draw the emf to the second bitmap Use LockBits to iterate through every pixel of both bitmaps (look up help on lock bits or search bob's website) Set pixels to transparent in the initial bitmap based on the second bitmap. That's probably not enough detail again but give it a go and have a look at LockBits and get back to me with any questions. Michael
Hi Michael,
I see what you mean. That seems a good idea and I'll give it a go. Thanks very much for the extra details. Mark [quoted text, click to view] "Michael C" <nospam@nospam.com> wrote in message
news:ecYo$K1wHHA.4628@TK2MSFTNGP02.phx.gbl... > "Mark" <NoSpam@Thanks.com> wrote in message > news:ujBR9%23rwHHA.4736@TK2MSFTNGP04.phx.gbl... >> Thanks for your reply Michael. Why not ideal? > > When I say not ideal I mean there might be a better method that I don't > know about, such as converting an emf to a path. Then again my idea might > be the only option seeing there have been no other replies. > >> Unfortunately I'm stuck with having to use emf files. My assumption was >> that as Bob Powell's solution used a GraphicsPath I could get the same >> from an emf file? >> >> Could you give any more details on your idea as I'm quite new at this? > > Assuming you start with a bitmap of 100x100 and want to set some areas to > transparent based on an emf file (correct me if I'm wrong) try something > like this: > Create a second bitmap of 100x100 > Draw the emf to the second bitmap > Use LockBits to iterate through every pixel of both bitmaps (look up help > on lock bits or search bob's website) > Set pixels to transparent in the initial bitmap based on the second > bitmap. > > That's probably not enough detail again but give it a go and have a look > at LockBits and get back to me with any questions. > > Michael >
Hi Mark
Did you get anywhere with your graphicpath clipping ? I'm trying to 'cut out' an area of an image using a graphics path so that I can assign the clipped image to a button. I posted here on 7/16/07 but no takers. [quoted text, click to view] "Mark" wrote:
> Hi Michael, > > I see what you mean. That seems a good idea and I'll give it a go. > > Thanks very much for the extra details. > > Mark > > "Michael C" <nospam@nospam.com> wrote in message > news:ecYo$K1wHHA.4628@TK2MSFTNGP02.phx.gbl... > > "Mark" <NoSpam@Thanks.com> wrote in message > > news:ujBR9%23rwHHA.4736@TK2MSFTNGP04.phx.gbl... > >> Thanks for your reply Michael. Why not ideal? > > > > When I say not ideal I mean there might be a better method that I don't > > know about, such as converting an emf to a path. Then again my idea might > > be the only option seeing there have been no other replies. > > > >> Unfortunately I'm stuck with having to use emf files. My assumption was > >> that as Bob Powell's solution used a GraphicsPath I could get the same > >> from an emf file? > >> > >> Could you give any more details on your idea as I'm quite new at this? > > > > Assuming you start with a bitmap of 100x100 and want to set some areas to > > transparent based on an emf file (correct me if I'm wrong) try something > > like this: > > Create a second bitmap of 100x100 > > Draw the emf to the second bitmap > > Use LockBits to iterate through every pixel of both bitmaps (look up help > > on lock bits or search bob's website) > > Set pixels to transparent in the initial bitmap based on the second > > bitmap. > > > > That's probably not enough detail again but give it a go and have a look > > at LockBits and get back to me with any questions. > > > > Michael > > >
Not yet I'm afraid.
Will post back when I make progress. Mark [quoted text, click to view] "ohs" <ohs@discussions.microsoft.com> wrote in message
news:6D5DB01E-341B-4C72-B10A-44259D60FCA2@microsoft.com... > Hi Mark > > Did you get anywhere with your graphicpath clipping ? > > I'm trying to 'cut out' an area of an image using a graphics path so that > I > can assign the clipped image to a button. > > > I posted here on 7/16/07 but no takers. > > "Mark" wrote: > >> Hi Michael, >> >> I see what you mean. That seems a good idea and I'll give it a go. >> >> Thanks very much for the extra details. >> >> Mark >> >> "Michael C" <nospam@nospam.com> wrote in message >> news:ecYo$K1wHHA.4628@TK2MSFTNGP02.phx.gbl... >> > "Mark" <NoSpam@Thanks.com> wrote in message >> > news:ujBR9%23rwHHA.4736@TK2MSFTNGP04.phx.gbl... >> >> Thanks for your reply Michael. Why not ideal? >> > >> > When I say not ideal I mean there might be a better method that I don't >> > know about, such as converting an emf to a path. Then again my idea >> > might >> > be the only option seeing there have been no other replies. >> > >> >> Unfortunately I'm stuck with having to use emf files. My assumption >> >> was >> >> that as Bob Powell's solution used a GraphicsPath I could get the same >> >> from an emf file? >> >> >> >> Could you give any more details on your idea as I'm quite new at this? >> > >> > Assuming you start with a bitmap of 100x100 and want to set some areas >> > to >> > transparent based on an emf file (correct me if I'm wrong) try >> > something >> > like this: >> > Create a second bitmap of 100x100 >> > Draw the emf to the second bitmap >> > Use LockBits to iterate through every pixel of both bitmaps (look up >> > help >> > on lock bits or search bob's website) >> > Set pixels to transparent in the initial bitmap based on the second >> > bitmap. >> > >> > That's probably not enough detail again but give it a go and have a >> > look >> > at LockBits and get back to me with any questions. >> > >> > Michael >> > >> >>
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