Re: [wxperl-users] DCPaint Widget Question

[Vaughn S. <vau...@in...>]

Mark,

Good morning & thanks for the post.

Is there a particular source of information that I should seek for 
background information on the "SetLogicalFunction" method?  I've spent 
the last several hours scouring the 'net for details and have mostly 
come up empty handed.

I did locate several programming examples ... albeit nothing written in 
Perl.  The best (attached) is written in Python, and is unfortunately 
beyond my grasp in terms of how to implement in Perl.

In studying the attached, as a novice, it does spur recognition that the 
undo/redo capability is fundamental to marking up displayed images. 
Basic drawing (lines/rects/text) on an image is fairly straightforward. 
But interacting with the drawn primitives after-the-fact is really what 
I'm after ... the ability to select, move, delete ... and that's where 
I'm stuck.

Any further thoughts would be greatly appreciated.

Best regards,

Vaughn

----- Original Message ----- 
From: "Mark Dootson" <mar...@zn...>
To: "Gene Beaumont" <gen...@in...>
Cc: <wxp...@li...>
Sent: Monday, March 19, 2007 2:32 PM
Subject: Re: [wxperl-users] DCPaint Widget Question


Hi,

I assume you just want to remove individual items rather than clear the
whole canvas?

Sorry, I have no code snippet but the function you need is

Wx::DC::SetLogicalFunction

The general approach is to repeat the drawing code after setting the
appropriate logical function - so overwriting returns you to the
original background. I don't have the correct logical functions to use,
but hopefully this points you in the right direction.

Regards

Mark


Gene Beaumont wrote:
> Can anyone supply info and/or code snippet concerning how to undo/redo
> text & primitives that are drawn on a canvas that is created via the
> following:
>
>      my $dc = Wx::PaintDC->new( $self );
>
> Thanks,
> Gene
>
> Eugene S. Beaumont Jr.
> Senior Consultant
> Intercept Technology Inc.
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