🚀 go-pugleaf

Sounds like your using VCL rather than native api...

Not clear _how_ you're putting your chart on the form...

But, if your using a TImage(->Picture->Bitmap), try putting a TScrollBox on 
the form, and then plop the TImage onto the ScrollBox.  I believe you will 
be able to generate a bitmap larger than either the scrollbox, or chart - 
subject, no doubt to available memory, and/or application address space.

"Mark Jacobs" <http://www.jacobsm.com/mjmsg.htm?BorlandNG> wrote in message 
news:470500be$1@newsgroups.borland.com...
>I have a chart that is produced on a form. If I want the chart to be 800 by 
>600 pixels, I set the form to be this size, draw the chart, and then use 
>GetFormImage() to bung a bitmap of the chart into a file. The problem is 
>that the chart size is limited to the screen resolution using this 
>technique. Is there a flag or something, I can set for the Form which 
>allows me to size it past the screen dimensions?
> -- 
> Mark Jacobs
> DK Computing
> http://www.dkcomputing.co.uk
> 

Hi Mark

In article <470500be$1@newsgroups.borland.com>, "Mark Jacobs" 
<http://www.jacobsm.com/mjmsg.htm?BorlandNG> says...
> I have a chart that is produced on a form. If I want the chart to be 800 by 
> 600 pixels, I set the form to be this size, draw the chart, and then use 
> GetFormImage() to bung a bitmap of the chart into a file. The problem is that 
> the chart size is limited to the screen resolution using this technique. Is 
> there a flag or something, I can set for the Form which allows me to size it 
> past the screen dimensions?
 
It is much faster to draw on a bitmap in memory 
and then when done use BitBlt to copy the bitmap to 
canvas.
But if You put a TImage on the form and then asign
the bitmap to the Image the bitmap wil automaticly resize.
Just remember to set autosize=true on the image.

Kind regards
Asger

"Mark Jacobs" <http://www.jacobsm.com/mjmsg.htm?BorlandNG> wrote:

>The problem is that the chart size is limited to the screen resolution

See  Compatible Device Contexts  in the help

The steps:
	hDC = CreateCompatibleDC
	hBM = CreateCompatibleBitmap
	tBM = SelectObject( hDC, hBM )

	Draw on the hDC
	Save the bitmap

	SelectObject( hDC, tBM )
	DeleteObject( hBM )
	DeleteDC( hDC )

"dhoke" <dhoke.nojunk@east-shore.com> wrote in message 
news:4705035c@newsgroups.borland.com...
> Sounds like your using VCL rather than native api...

Yes, this is true. TForm is the component I am trying to resize. Perhaps the 
question would be more pertinent in cppbuilder.vcl.components.using instead 
of here.

> Not clear _how_ you're putting your chart on the form...

It is a TChart that is dropped onto the form and then aligned alClient, so 
that it naturally occupies the entire form canvas, whatever the size of the 
form is.

> But, if your using a TImage(->Picture->Bitmap), try putting a TScrollBox 
> on the form, and then plop the TImage onto the ScrollBox.  I believe you 
> will be able to generate a bitmap larger than either the scrollbox, or 
> chart - subject, no doubt to available memory, and/or application address 
> space.

But, GetFormImage() won't yield a large bitmap, it will be just what of the 
form is visible on screen. I need to get the form to be bigger than the 
screen, and GetFormImage() to yield a bitmap that exceeds screen dimensions.
-- 
Mark Jacobs
www.jacobsm.com 

Please see my other reply - I have no control over the drawing - it is a 
TChart.
-- 
Mark Jacobs
www.jacobsm.com 

Hi Mark

In article <47051a6f@newsgroups.borland.com>, mark@jacobsm.com 
says...
> 
> But, GetFormImage() won't yield a large bitmap, it will be just what of the 
> form is visible on screen. I need to get the form to be bigger than the 
> screen, and GetFormImage() to yield a bitmap that exceeds screen dimensions.
 
Have You tryed something like this ?

TBitmap* Bmp = new TBitmap();
Bmp->Width = Chart->Width;
Bmp->Height = Chart->Height;

BitBlt(
    Bmp->Canvas->Handle,	 
    0,0,Chart->Width,
    Chart->Height,	
    Chart->TeCanvas->Canvas->Handle,
    0,0,SRCCOPY
);

Bmp->SaveToFile(FileName);
delete Bmp;

**********  NOT TESTED  **********

Kind regards
Asger

=?utf-8?Q?Asger_J=C3=B8rgensen?= <junk@Asger-P.dk> wrote:
>
>
>BitBlt(
>    Bmp->Canvas->Handle,	 
>    0,0,Chart->Width,
>    Chart->Height,	
>    Chart->TeCanvas->Canvas->Handle,

Shouldn't that be (?) :

    Chart->Canvas->Handle,

>    0,0,SRCCOPY
>);

Another option would be to use TCanvas::PaintTo.

~ JD

Hi JD

In article <4706249b$1@newsgroups.borland.com>, 
nospam@nospam.com says...
> 
> Shouldn't that be (?) :
> 
>     Chart->Canvas->Handle,

It should probably be:
 
Chart->Canvas->Canvas->Handle

since the first canvas is a special 3d canvas
acording to the help files. But I never used the
TChart

Kind regards
Asger

"Asger J�rgensen" <junk@Asger-P.dk> wrote in message 
news:MPG.2170cc41e12c533989837@newsgroups.borland.com...
> It should probably be:
>
> Chart->Canvas->Canvas->Handle
>
> since the first canvas is a special 3d canvas
> acording to the help files.

The help files are incorrect. The only real TCanvas type of canvas I can 
access on a TChart is something called ReferenceCanvas. However, if I have 
Chart3 with width and height beyond the screen dimensions, and then do :-
Graphics::TBitmap *mjbmp=new Graphics::TBitmap();

TRect rc=Rect(0,0,Chart3->Width-1,Chart3->Height-1);

mjbmp->HandleType=bmDIB;

mjbmp->Height=Chart3->Height; mjbmp->Width=Chart3->Width;

mjbmp->Canvas->CopyRect(rc,Chart3->Canvas->ReferenceCanvas,rc);

to copy the chart picture to my bitmap, anything off-screen is chopped off! 
I am still stumped.
-- 
Mark Jacobs
www.jacobsm.com 

"Mark Jacobs" <mark@jacobsm.com> wrote:
>
>
> [...] anything off-screen is chopped off!

Makes sense because windows would clip that drawing in the
first place.

> I am still stumped.

Try using TWinControl::PaintTo method. Something like:

    Bmp->Canvas->Lock();
    Chart->PaintTo( Bmp->Canvas->Handle, 0, 0 );
    Bmp->Canvas->Unlock();

~ JD

"JD" <nospam@nospam.com> wrote in message 
news:4707d08e$1@newsgroups.borland.com...
> Try using TWinControl::PaintTo method. Something like:
>
>    Bmp->Canvas->Lock();
>    Chart->PaintTo( Bmp->Canvas->Handle, 0, 0 );
>    Bmp->Canvas->Unlock();
>

That works a treat! Thanks ever so muchly. :-)
-- 
Mark Jacobs
DK Computing
http://www.dkcomputing.co.uk