BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  TImage sizesmaller than image          BorlandTalk.com Forum Index -> C++ Builder (Graphics) View previous topic :: View next topic   Author Message IraqiGeek Guest Posted: Fri Sep 08, 2006 8:10 am    Post subject: TImage sizesmaller than image Hi again, I am trying to view an image that is 3008x2000 pixels in size. Obviously, this won't fit into the screen. I am holding the bitmap in a Graphics::TBitMap which is big enough to fit the bitmap in question. However, the TImage which will display this bitmap on screen is obviously smaller than the size of the bitmap. How can I show this bitmap on a TImage, with scrolling bars, so I could scroll through the entire image on screen. -- Regards, IraqiGeek www.iraqigeek.com The goal of the works of a genius' existance lies only in itself. Back to top Hans Galema Guest Posted: Fri Sep 08, 2006 4:00 pm    Post subject: Re: TImage sizesmaller than image IraqiGeek wrote: Quote: I am trying to view an image that is 3008x2000 pixels in size. Obviously, this won't fit into the screen. Untested: Put the TImage (Autosize == true) on a TScrollBox. Hans. Back to top Hans Galema Guest Posted: Fri Sep 08, 2006 4:06 pm    Post subject: Re: TImage sizesmaller than image Hans Galema wrote: Quote: Put the TImage (Autosize == true) on a TScrollBox. A TScrollBox is not needed. Just put a TImage on a TForm and set TImage::AutoSize to true; Hans. Back to top IraqiGeek Guest Posted: Fri Sep 08, 2006 6:26 pm    Post subject: Re: TImage sizesmaller than image Hans Galema wrote: Quote: Hans Galema wrote: Put the TImage (Autosize == true) on a TScrollBox. A TScrollBox is not needed. Just put a TImage on a TForm and set TImage::AutoSize to true; Hans. Already did that before asking in the group, and it didn't work. I tried to put the TImage inside a TScrollBox, but didn't know how to do that either. -- Regards, IraqiGeek www.iraqigeek.com Love may not make the world go round, but I must admit that it makes the ride worthwhile. Sean Connery Back to top JD Guest Posted: Fri Sep 08, 2006 9:35 pm    Post subject: Re: TImage sizesmaller than image "IraqiGeek" <geek (AT) iraqigeek (DOT) com> wrote: Quote: I am trying to view an image that is 3008x2000 pixels in size. Drop a TScrollBox on the form and set it's Align property to alClient. Then drop a TPaintBox onto the TScrollBox. Set it's Left and Top properties to 0,0. Now, all that you need to do is size the TPaintBox to match your TBitmap. So, when you know what it's Width and Height are, set the TPaintBox's Width and Height accordingly. The only other thing that you need to do is add an OnPaint event to the TPaintBox to copy the image of the bitmap to the screen which is one line of code: PaintBox1->Canvas->CopyRect( Rect(0,0,Bmp->Width,Bmp->Height), Bmp->Canvas, Rect(0,0,Bmp->Width,Bmp->Height) ); You'll probably need some sort of checking to prevent an AV because when the form is displayed, the OnPaint event will fire and at that point the Bitmap probably won't be valid yet. So, something like: if( Bmp ) { // paint it } ~ JD Back to top IraqiGeek Guest Posted: Sat Sep 09, 2006 2:38 am    Post subject: Re: TImage sizesmaller than image JD wrote: Quote: "IraqiGeek" <geek (AT) iraqigeek (DOT) com> wrote: I am trying to view an image that is 3008x2000 pixels in size. Drop a TScrollBox on the form and set it's Align property to alClient. Then drop a TPaintBox onto the TScrollBox. Set it's Left and Top properties to 0,0. Now, all that you need to do is size the TPaintBox to match your TBitmap. So, when you know what it's Width and Height are, set the TPaintBox's Width and Height accordingly. The only other thing that you need to do is add an OnPaint event to the TPaintBox to copy the image of the bitmap to the screen which is one line of code: PaintBox1->Canvas->CopyRect( Rect(0,0,Bmp->Width,Bmp->Height), Bmp->Canvas, Rect(0,0,Bmp->Width,Bmp->Height) ); You'll probably need some sort of checking to prevent an AV because when the form is displayed, the OnPaint event will fire and at that point the Bitmap probably won't be valid yet. So, something like: if( Bmp ) { // paint it } ~ JD Thanks again JD. I got the bitmap inside the scroll box, but when I scroll in either direction, the image isnt redrawn. I tried using TPaintBox->Refresh() being called from TFrom::FormPaint, but it didn't work, and brought the system to its knees. -- Regards, IraqiGeek www.iraqigeek.com The wise man learns more from his enemies than a fool does from his friends. Chinese Proverb Back to top Remy Lebeau (TeamB) Guest Posted: Sat Sep 09, 2006 4:11 am    Post subject: Re: TImage sizesmaller than image "IraqiGeek" <geek (AT) iraqigeek (DOT) com> wrote in message news:45011aef (AT) newsgroups (DOT) borland.com... Quote: How can I show this bitmap on a TImage, with scrolling bars, so I could scroll through the entire image on screen. Put the TImage onto a TScrollBox that has its AutoScroll and AutoSize properties set to true. After loading the TImage, you can then assign the image's Width and Height values to the TScrollBox's HorzScrollBar->Range and VertScrollBar->Range properties, respectively Gambit Back to top IraqiGeek Guest Posted: Sat Sep 09, 2006 6:27 am    Post subject: Re: TImage sizesmaller than image Remy Lebeau (TeamB) wrote: Quote: "IraqiGeek" <geek (AT) iraqigeek (DOT) com> wrote in message news:45011aef (AT) newsgroups (DOT) borland.com... How can I show this bitmap on a TImage, with scrolling bars, so I could scroll through the entire image on screen. Put the TImage onto a TScrollBox that has its AutoScroll and AutoSize properties set to true. After loading the TImage, you can then assign the image's Width and Height values to the TScrollBox's HorzScrollBar->Range and VertScrollBar->Range properties, respectively Gambit Thanks Remy, this is exactly what I was looking for. It works beautifully. -- Regards, IraqiGeek www.iraqigeek.com To err is human; to really foul things up requires a computer. 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