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Chri
Guest
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 Posted: Fri Nov 21, 2003 3:40 pm Post subject: TCanvas |
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Hi, can anyone tell me how can I get the Canvas of a TPanel control? This
because I have to draw on a panel and I need the TCanvas class because it
provide a lot of nice function member: CopyRect is very usefull and I use it
a lot!!! Thanks, Chri.
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Dennis Jones
Guest
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| Posted: Fri Nov 21, 2003 5:01 pm Post subject: Re: TCanvas |
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"Chri" <chrip (AT) libero (DOT) it> wrote
| Quote: | Hi, can anyone tell me how can I get the Canvas of a TPanel control? This
because I have to draw on a panel and I need the TCanvas class because it
provide a lot of nice function member: CopyRect is very usefull and I use
it
a lot!!! Thanks, Chri.
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Canvas is not an exposed property of TPanel. You could, however, place a
TImage on the panel, and use its Canvas instead.
- Dennis
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Chri
Guest
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| Posted: Fri Nov 21, 2003 5:15 pm Post subject: Re: TCanvas |
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No I prefer to use TPanel because TImage has a bad refresh (fliker
noise!!!).
"Dennis Jones" <djones (AT) nospam (DOT) com> ha scritto nel messaggio
news:3fbe44f2$1 (AT) newsgroups (DOT) borland.com...
| Quote: |
"Chri" <chrip (AT) libero (DOT) it> wrote in message
news:3fbe31d3 (AT) newsgroups (DOT) borland.com...
Hi, can anyone tell me how can I get the Canvas of a TPanel control?
This
because I have to draw on a panel and I need the TCanvas class because
it
provide a lot of nice function member: CopyRect is very usefull and I
use
it
a lot!!! Thanks, Chri.
Canvas is not an exposed property of TPanel. You could, however, place a
TImage on the panel, and use its Canvas instead.
- Dennis
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Giuliano
Guest
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| Posted: Fri Nov 21, 2003 5:48 pm Post subject: Re: TCanvas |
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On Fri, 21 Nov 2003 18:15:42 +0100, "Chri" <chrip (AT) libero (DOT) it> wrote:
| Quote: | Hi, can anyone tell me how can I get the Canvas of a TPanel control?
This
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Hi,
try to use a TControlCanvas:
#include <memory>
using std::auto_ptr;
void __fastcall TForm1::Button1Click(TObject *Sender)
{
const auto_ptr<TControlCanvas> PanelCanvas( new TControlCanvas );
PanelCanvas->Control = Panel1;
PanelCanvas->MoveTo( 10, 10 );
PanelCanvas->LineTo( 100, 50 );
}
HTH
Giuliano
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Remy Lebeau (TeamB)
Guest
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| Posted: Fri Nov 21, 2003 8:21 pm Post subject: Re: TCanvas |
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"Chri" <chrip (AT) libero (DOT) it> wrote
| Quote: | Hi, can anyone tell me how can I get the Canvas of a TPanel control?
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Derive a new class from TPanel and promote the inherited Canvas property to
public access. Then use that class instead of the standard TPanel.
Gambit
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