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Re: [perl-win32-gui-users] Drawing transparently.
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From: Jeremy W. <jez...@ho...> - 2008-12-15 09:43:16
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Hi,
Ok I understand a little more of what you are trying to do.
Windows has two main drawing modes: One mode windows draws the windows itself, the other is where you draw the window (ie, supply the paint event). You can mix styles, but it gets very complicated as you have to treat the window in certain ways depending on what controls are present. Googling with "owner drawn windows" should give you more examples. If you dont need windows controls, then things will become easyer.
For performance reasons you need to use an off screen DC to keep updated (I think one of the examples does this) and then only update the the main window when necessary (blitting to an offscreen DC is much faster). Both the offscreen DC and the window would be blitted to so you should have no problem maintain 30 frames a second.
Cheers,
jeremy.
From: msj...@ho...
To: jez...@ho...; per...@li...
Date: Sat, 13 Dec 2008 16:51:16 -0500
Subject: Re: [perl-win32-gui-users] Drawing transparently.
Jeremy,
first off thank you for the reply.
The example you've given works visually, but it is not what I intended to do obtain. :-)
I think I should have given more details at the beginning. :-)
The project I am currently working on will "repaint" ca 30 times per second.
It will be a full-screen application with some data overlayed at the aforementioned sample rate.
The intention is/was to use a series of labels to transparently display the information. I say labels but it could be any other object/container that can be used within the main window and that supports transparency.
Why? The original intention was to minimize the amount of "blitting" (for performance and appearance reasons) as much as possible by using "containers" which size is limited to the changed area.
Hope this is a bit clearer and thank you again for the help.
Giuseppe
From: jez...@ho...
To: msj...@ho...; per...@li...
Subject: RE: [perl-win32-gui-users] Drawing transparently.
Date: Sat, 13 Dec 2008 18:03:18 +0000
Hi,
I think you are mixing drawing styles - try the below:
cheers,
jez.
use strict;
use warnings;
use Win32::GUI();
use Win32::GUI::DIBitmap;
use FindBin();
$|++;
my $interval = 1000;
my $dib = newFromFile Win32::GUI::DIBitmap("Zapotec.bmp")
or die "newFromFile";
my $main = Win32::GUI::Window->new(
-name => 'Main',
-width => 150,
-height => 100,
-onTimer => \&redraw_Timer,
-onPaint => \&Main_Paint,
-text => 'Transparent Label',
);
$main->AddTimer( "redraw_Timer", $interval );
my $label = $main->AddLabel(
-text => scalar(localtime),
-addstyle => 11, # TRANSPARENT
);
#-------------------------------------------------------------------------------
$main->Show();
Win32::GUI::Dialog();
$main->Hide();
exit(0);
#-------------------------------------------------------------------------------
sub Main_Paint {
printf( "[%s] Main Paint Event Fired.\n", scalar(localtime) );
my $self = shift;
my $dc = shift;
my ( $width, $height ) = ( $self->GetClientRect )[ 2 .. 3 ];
$dib->StretchToDC( $dc, 0, 0, $width, $height );
$dc->BkMode(1);
$dc->TextOut(4,14,scalar(localtime));
$dc->Validate();
return 1;
}
sub Main_Terminate {
-1;
}
sub redraw_Timer {
my $temp = localtime;
$main->InvalidateRect(1); # Forces Redraw
select( undef, undef, undef, 1 / 4 );
$label->Text($temp);
}
> From: msj...@ho...
> To: per...@li...
> Date: Fri, 12 Dec 2008 08:56:27 -0800
> Subject: [perl-win32-gui-users] Drawing transparently.
>
> Hi all,
> I put together a smaller example to better show my issue.
>
> <code>
> #!/C/Perl/bin/perl.exe
> use strict;
> use warnings;
> use Win32::GUI();
> use Win32::GUI::DIBitmap;
>
> $|++;
>
> my $interval = 1000;
>
> my $dib = newFromFile Win32::GUI::DIBitmap("Zapotec.bmp")
> or die "newFromFile";
>
> my $main = Win32::GUI::Window->new(
> -name => 'Main',
> -width => 150,
> -height => 100,
> -onTimer => \&redraw_Timer,
> -onPaint => \&Main_Paint,
> -text => 'Transparent Label',
> );
>
> $main->AddTimer( "redraw_Timer", $interval );
>
> my $label = $main->AddLabel(
> -text => scalar(localtime),
> -addstyle => 11, # TRANSPARENT
> );
>
> #-------------------------------------------------------------------------------
> $main->Show();
> Win32::GUI::Dialog();
> $main->Hide();
> exit(0);
>
> #-------------------------------------------------------------------------------
>
> sub Main_Paint {
> printf( "[%s] Main Paint Event Fired.\n", scalar(localtime) );
> my $self = shift;
> my $dc = shift;
> my ( $width, $height ) = ( $self->GetClientRect )[ 2 .. 3 ];
> $dib->StretchToDC( $dc, 0, 0, $width, $height );
> $dc->Validate();
> return 1;
> }
>
> sub Main_Terminate {
> -1;
> }
>
> sub redraw_Timer {
> my $temp = localtime;
> $main->InvalidateRect(1); # Forces Redraw
> select( undef, undef, undef, 1 / 4 );
> $label->Text($temp);
> }
> </code>
>
> If I remove the bitmap background (onPaint) and add a "-background => [0,255,0]," to the Main window I obtain the desired result. Unfortunately in my case I am dealing with a background obtained via DC cals.
>
> Again, thank you in advance for any help.
>
> Giuseppe
>
>
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