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Simulate AutoredrawHi All:
I want to simulate VB6 Autoredraw in VB.Net I figure I would probably have to create a memory dc, paint to that, and then create a bitmap based on the dc and copy that image into a bitmap, and then assign that to the image property of my control? If so, then can someone push me in the right direction to get started on this. If not, then what would you suggest. Thanks. Doug. Just create a bitmap that's persistent. You can then create a graphics
object from it and draw on the bitmap. In the paint event, you can use bitblt to copy the bitmap to your form, picture box, or whatever. I have an example if you like. -- Show quoteHide quoteDennis in Houston "Doug Marquardt" wrote: > Hi All: > > I want to simulate VB6 Autoredraw in VB.Net > > I figure I would probably have to create a memory dc, > paint to that, and then create a bitmap based on the dc > and copy that image into a bitmap, > and then assign that to the image property of my control? > > If so, then can someone push me in the right direction > to get started on this. > > If not, then what would you suggest. > > Thanks. > > Doug. > > > Hi Dennis:
That was the first thing I looked at, but I couldn't figure out how to draw to the bitmap (the only method I saw was for setting pixels). So how do you draw to the bitmap? Doug. Show quoteHide quote "Dennis" <Den***@discussions.microsoft.com> wrote in message news:4CEAC020-1D11-4686-937B-280B6AAF7009@microsoft.com... > Just create a bitmap that's persistent. You can then create a graphics > object from it and draw on the bitmap. In the paint event, you can use > bitblt to copy the bitmap to your form, picture box, or whatever. I have an > example if you like. > -- > Dennis in Houston > > > "Doug Marquardt" wrote: > > > Hi All: > > > > I want to simulate VB6 Autoredraw in VB.Net > > > > I figure I would probably have to create a memory dc, > > paint to that, and then create a bitmap based on the dc > > and copy that image into a bitmap, > > and then assign that to the image property of my control? > > > > If so, then can someone push me in the right direction > > to get started on this. > > > > If not, then what would you suggest. > > > > Thanks. > > > > Doug. > > > > > > Hi Dennis:
I was able to figure out to create the graphics from the bitmap, and was able to draw to it, etc. Assigning the bitmap to the image property seems to work fine... what advantages would there be to bitblt in the paint event? Doug. Show quoteHide quote "Doug Marquardt" <no_spam@dummy.com> wrote in message news:%23IgjOtQ4GHA.3444@TK2MSFTNGP02.phx.gbl... > Hi Dennis: > > That was the first thing I looked at, but I couldn't > figure out how to draw to the bitmap (the only > method I saw was for setting pixels). > > So how do you draw to the bitmap? > > Doug. > > "Dennis" <Den***@discussions.microsoft.com> wrote in message > news:4CEAC020-1D11-4686-937B-280B6AAF7009@microsoft.com... > > Just create a bitmap that's persistent. You can then create a graphics > > object from it and draw on the bitmap. In the paint event, you can use > > bitblt to copy the bitmap to your form, picture box, or whatever. I have > an > > example if you like. > > -- > > Dennis in Houston > > > > > > "Doug Marquardt" wrote: > > > > > Hi All: > > > > > > I want to simulate VB6 Autoredraw in VB.Net > > > > > > I figure I would probably have to create a memory dc, > > > paint to that, and then create a bitmap based on the dc > > > and copy that image into a bitmap, > > > and then assign that to the image property of my control? > > > > > > If so, then can someone push me in the right direction > > > to get started on this. > > > > > > If not, then what would you suggest. > > > > > > Thanks. > > > > > > Doug. > > > > > > > > > > > I think it may be a bit quicker.
-- Show quoteHide quoteDennis in Houston "Doug Marquardt" wrote: > Hi Dennis: > > I was able to figure out to create the graphics from the bitmap, > and was able to draw to it, etc. > Assigning the bitmap to the image property seems to work fine... > what advantages would there be to bitblt in the paint event? > > Doug. > > > > "Doug Marquardt" <no_spam@dummy.com> wrote in message > news:%23IgjOtQ4GHA.3444@TK2MSFTNGP02.phx.gbl... > > Hi Dennis: > > > > That was the first thing I looked at, but I couldn't > > figure out how to draw to the bitmap (the only > > method I saw was for setting pixels). > > > > So how do you draw to the bitmap? > > > > Doug. > > > > "Dennis" <Den***@discussions.microsoft.com> wrote in message > > news:4CEAC020-1D11-4686-937B-280B6AAF7009@microsoft.com... > > > Just create a bitmap that's persistent. You can then create a graphics > > > object from it and draw on the bitmap. In the paint event, you can use > > > bitblt to copy the bitmap to your form, picture box, or whatever. I > have > > an > > > example if you like. > > > -- > > > Dennis in Houston > > > > > > > > > "Doug Marquardt" wrote: > > > > > > > Hi All: > > > > > > > > I want to simulate VB6 Autoredraw in VB.Net > > > > > > > > I figure I would probably have to create a memory dc, > > > > paint to that, and then create a bitmap based on the dc > > > > and copy that image into a bitmap, > > > > and then assign that to the image property of my control? > > > > > > > > If so, then can someone push me in the right direction > > > > to get started on this. > > > > > > > > If not, then what would you suggest. > > > > > > > > Thanks. > > > > > > > > Doug. > > > > > > > > > > > > > > > > > > > Hi Dennis:
Pardon my ignorance here... but I really don't see how bitblt in the paint event could be quicker than assigning the bitmap to the image -- the point being that once I assign the image the control takes over all the painting, etc.??? Just curious... Doug. Show quoteHide quote "Dennis" <Den***@discussions.microsoft.com> wrote in message news:62E328B6-D10B-406B-AE2A-A233D041A012@microsoft.com... > I think it may be a bit quicker. > -- > Dennis in Houston > > > "Doug Marquardt" wrote: > > > Hi Dennis: > > > > I was able to figure out to create the graphics from the bitmap, > > and was able to draw to it, etc. > > Assigning the bitmap to the image property seems to work fine... > > what advantages would there be to bitblt in the paint event? > > > > Doug. > > > > > > > > "Doug Marquardt" <no_spam@dummy.com> wrote in message > > news:%23IgjOtQ4GHA.3444@TK2MSFTNGP02.phx.gbl... > > > Hi Dennis: > > > > > > That was the first thing I looked at, but I couldn't > > > figure out how to draw to the bitmap (the only > > > method I saw was for setting pixels). > > > > > > So how do you draw to the bitmap? > > > > > > Doug. > > > > > > "Dennis" <Den***@discussions.microsoft.com> wrote in message > > > news:4CEAC020-1D11-4686-937B-280B6AAF7009@microsoft.com... > > > > Just create a bitmap that's persistent. You can then create a graphics > > > > object from it and draw on the bitmap. In the paint event, you can use > > > > bitblt to copy the bitmap to your form, picture box, or whatever. I > > have > > > an > > > > example if you like. > > > > -- > > > > Dennis in Houston > > > > > > > > > > > > "Doug Marquardt" wrote: > > > > > > > > > Hi All: > > > > > > > > > > I want to simulate VB6 Autoredraw in VB.Net > > > > > > > > > > I figure I would probably have to create a memory dc, > > > > > paint to that, and then create a bitmap based on the dc > > > > > and copy that image into a bitmap, > > > > > and then assign that to the image property of my control? > > > > > > > > > > If so, then can someone push me in the right direction > > > > > to get started on this. > > > > > > > > > > If not, then what would you suggest. > > > > > > > > > > Thanks. > > > > > > > > > > Doug. > > > > > > > > > > > > > > > > > > > > > > > > > > > Use whatever you want. I personally use the bitblt and it's ligntning
quick. I would think that an image has to be rendered during each paint event from a general format and copied to the picturebox or whatever. In VB6 and before, I think controls had the option of having their background persistent in memory and didn't have to be redarwn to the picturebox, etc. each time it was repainted. However, in VB.Net this changed so the image has to be copied to the picturebox during each paint event. -- Show quoteHide quoteDennis in Houston "Doug Marquardt" wrote: > Hi Dennis: > > Pardon my ignorance here... > but I really don't see how bitblt in the paint event > could be quicker than assigning the bitmap > to the image -- the point being that once I assign > the image the control takes over all the painting, etc.??? > > Just curious... > > Doug. > > > "Dennis" <Den***@discussions.microsoft.com> wrote in message > news:62E328B6-D10B-406B-AE2A-A233D041A012@microsoft.com... > > I think it may be a bit quicker. > > -- > > Dennis in Houston > > > > > > "Doug Marquardt" wrote: > > > > > Hi Dennis: > > > > > > I was able to figure out to create the graphics from the bitmap, > > > and was able to draw to it, etc. > > > Assigning the bitmap to the image property seems to work fine... > > > what advantages would there be to bitblt in the paint event? > > > > > > Doug. > > > > > > > > > > > > "Doug Marquardt" <no_spam@dummy.com> wrote in message > > > news:%23IgjOtQ4GHA.3444@TK2MSFTNGP02.phx.gbl... > > > > Hi Dennis: > > > > > > > > That was the first thing I looked at, but I couldn't > > > > figure out how to draw to the bitmap (the only > > > > method I saw was for setting pixels). > > > > > > > > So how do you draw to the bitmap? > > > > > > > > Doug. > > > > > > > > "Dennis" <Den***@discussions.microsoft.com> wrote in message > > > > news:4CEAC020-1D11-4686-937B-280B6AAF7009@microsoft.com... > > > > > Just create a bitmap that's persistent. You can then create a > graphics > > > > > object from it and draw on the bitmap. In the paint event, you can > use > > > > > bitblt to copy the bitmap to your form, picture box, or whatever. I > > > have > > > > an > > > > > example if you like. > > > > > -- > > > > > Dennis in Houston > > > > > > > > > > > > > > > "Doug Marquardt" wrote: > > > > > > > > > > > Hi All: > > > > > > > > > > > > I want to simulate VB6 Autoredraw in VB.Net > > > > > > > > > > > > I figure I would probably have to create a memory dc, > > > > > > paint to that, and then create a bitmap based on the dc > > > > > > and copy that image into a bitmap, > > > > > > and then assign that to the image property of my control? > > > > > > > > > > > > If so, then can someone push me in the right direction > > > > > > to get started on this. > > > > > > > > > > > > If not, then what would you suggest. > > > > > > > > > > > > Thanks. > > > > > > > > > > > > Doug. > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > Hi Dennis:
Not sure what you mean by "copied to the picturebox during each paint event"... as I only have to assign the bitmap to the control image property and forget about it. Are you saying that internally, vb.net has to copy/render any image each time the paint event is fired? In any case, what I am doing now works just fine and I do not notice any performance issues whatsoever. Thanks for getting me started on the right path with this. Doug. Show quoteHide quote "Dennis" <Den***@discussions.microsoft.com> wrote in message whatever. Inews:86A3BFD8-7C73-4BCF-B390-21234E46856A@microsoft.com... > Use whatever you want. I personally use the bitblt and it's ligntning > quick. I would think that an image has to be rendered during each paint > event from a general format and copied to the picturebox or whatever. In VB6 > and before, I think controls had the option of having their background > persistent in memory and didn't have to be redarwn to the picturebox, etc. > each time it was repainted. However, in VB.Net this changed so the image has > to be copied to the picturebox during each paint event. > > -- > Dennis in Houston > > > "Doug Marquardt" wrote: > > > Hi Dennis: > > > > Pardon my ignorance here... > > but I really don't see how bitblt in the paint event > > could be quicker than assigning the bitmap > > to the image -- the point being that once I assign > > the image the control takes over all the painting, etc.??? > > > > Just curious... > > > > Doug. > > > > > > "Dennis" <Den***@discussions.microsoft.com> wrote in message > > news:62E328B6-D10B-406B-AE2A-A233D041A012@microsoft.com... > > > I think it may be a bit quicker. > > > -- > > > Dennis in Houston > > > > > > > > > "Doug Marquardt" wrote: > > > > > > > Hi Dennis: > > > > > > > > I was able to figure out to create the graphics from the bitmap, > > > > and was able to draw to it, etc. > > > > Assigning the bitmap to the image property seems to work fine... > > > > what advantages would there be to bitblt in the paint event? > > > > > > > > Doug. > > > > > > > > > > > > > > > > "Doug Marquardt" <no_spam@dummy.com> wrote in message > > > > news:%23IgjOtQ4GHA.3444@TK2MSFTNGP02.phx.gbl... > > > > > Hi Dennis: > > > > > > > > > > That was the first thing I looked at, but I couldn't > > > > > figure out how to draw to the bitmap (the only > > > > > method I saw was for setting pixels). > > > > > > > > > > So how do you draw to the bitmap? > > > > > > > > > > Doug. > > > > > > > > > > "Dennis" <Den***@discussions.microsoft.com> wrote in message > > > > > news:4CEAC020-1D11-4686-937B-280B6AAF7009@microsoft.com... > > > > > > Just create a bitmap that's persistent. You can then create a > > graphics > > > > > > object from it and draw on the bitmap. In the paint event, you can > > use > > > > > > bitblt to copy the bitmap to your form, picture box, or Show quoteHide quote > > > > have > > > > > an > > > > > > example if you like. > > > > > > -- > > > > > > Dennis in Houston > > > > > > > > > > > > > > > > > > "Doug Marquardt" wrote: > > > > > > > > > > > > > Hi All: > > > > > > > > > > > > > > I want to simulate VB6 Autoredraw in VB.Net > > > > > > > > > > > > > > I figure I would probably have to create a memory dc, > > > > > > > paint to that, and then create a bitmap based on the dc > > > > > > > and copy that image into a bitmap, > > > > > > > and then assign that to the image property of my control? > > > > > > > > > > > > > > If so, then can someone push me in the right direction > > > > > > > to get started on this. > > > > > > > > > > > > > > If not, then what would you suggest. > > > > > > > > > > > > > > Thanks. > > > > > > > > > > > > > > Doug. > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > Yes, that's what I mean. I could be wrong but from what I've read, each
paint event requires the image to be copied to the picturebox or at least that part of it that needs to be redrawn. The picturebox is not displayed from a persistent area of memory. Maybe someone on this newsgroup can explain if I'm wrong or explain it better. -- Show quoteHide quoteDennis in Houston "Doug Marquardt" wrote: > Hi Dennis: > > Not sure what you mean by "copied to the picturebox during each paint > event"... > as I only have to assign the bitmap to the control image property and forget > about it. Are you saying that internally, vb.net has to copy/render any > image > each time the paint event is fired? > > In any case, what I am doing now works just fine and I do not notice > any performance issues whatsoever. > > Thanks for getting me started on the right path with this. > > Doug. > > > "Dennis" <Den***@discussions.microsoft.com> wrote in message > news:86A3BFD8-7C73-4BCF-B390-21234E46856A@microsoft.com... > > Use whatever you want. I personally use the bitblt and it's ligntning > > quick. I would think that an image has to be rendered during each paint > > event from a general format and copied to the picturebox or whatever. In > VB6 > > and before, I think controls had the option of having their background > > persistent in memory and didn't have to be redarwn to the picturebox, etc. > > each time it was repainted. However, in VB.Net this changed so the image > has > > to be copied to the picturebox during each paint event. > > > > -- > > Dennis in Houston > > > > > > "Doug Marquardt" wrote: > > > > > Hi Dennis: > > > > > > Pardon my ignorance here... > > > but I really don't see how bitblt in the paint event > > > could be quicker than assigning the bitmap > > > to the image -- the point being that once I assign > > > the image the control takes over all the painting, etc.??? > > > > > > Just curious... > > > > > > Doug. > > > > > > > > > "Dennis" <Den***@discussions.microsoft.com> wrote in message > > > news:62E328B6-D10B-406B-AE2A-A233D041A012@microsoft.com... > > > > I think it may be a bit quicker. > > > > -- > > > > Dennis in Houston > > > > > > > > > > > > "Doug Marquardt" wrote: > > > > > > > > > Hi Dennis: > > > > > > > > > > I was able to figure out to create the graphics from the bitmap, > > > > > and was able to draw to it, etc. > > > > > Assigning the bitmap to the image property seems to work fine... > > > > > what advantages would there be to bitblt in the paint event? > > > > > > > > > > Doug. > > > > > > > > > > > > > > > > > > > > "Doug Marquardt" <no_spam@dummy.com> wrote in message > > > > > news:%23IgjOtQ4GHA.3444@TK2MSFTNGP02.phx.gbl... > > > > > > Hi Dennis: > > > > > > > > > > > > That was the first thing I looked at, but I couldn't > > > > > > figure out how to draw to the bitmap (the only > > > > > > method I saw was for setting pixels). > > > > > > > > > > > > So how do you draw to the bitmap? > > > > > > > > > > > > Doug. > > > > > > > > > > > > "Dennis" <Den***@discussions.microsoft.com> wrote in message > > > > > > news:4CEAC020-1D11-4686-937B-280B6AAF7009@microsoft.com... > > > > > > > Just create a bitmap that's persistent. You can then create a > > > graphics > > > > > > > object from it and draw on the bitmap. In the paint event, you > can > > > use > > > > > > > bitblt to copy the bitmap to your form, picture box, or > whatever. I > > > > > have > > > > > > an > > > > > > > example if you like. > > > > > > > -- > > > > > > > Dennis in Houston > > > > > > > > > > > > > > > > > > > > > "Doug Marquardt" wrote: > > > > > > > > > > > > > > > Hi All: > > > > > > > > > > > > > > > > I want to simulate VB6 Autoredraw in VB.Net > > > > > > > > > > > > > > > > I figure I would probably have to create a memory dc, > > > > > > > > paint to that, and then create a bitmap based on the dc > > > > > > > > and copy that image into a bitmap, > > > > > > > > and then assign that to the image property of my control? > > > > > > > > > > > > > > > > If so, then can someone push me in the right direction > > > > > > > > to get started on this. > > > > > > > > > > > > > > > > If not, then what would you suggest. > > > > > > > > > > > > > > > > Thanks. > > > > > > > > > > > > > > > > Doug. > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > 
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