Reloading a perltk canvas tile

rossiya has asked for the wisdom of the Perl Monks concerning the following question:

I made a graph with:

 $image = $mainWindow -> Photo('image2', -file => 'composite.jpeg');
 
 $graph = $mainWindow -> PlotDataset<br>
            (
                #-width => 1304,
                -width => 1304,
                -height => 500,
                -background => 'snow',
                -tile => $image,
                -autoScaleX => "Off",
                -autoScaleY => "Off",
                #-autoScaleY1 => "Off",
            ) -> pack(-fill => 'both', -expand => 1);
[download]

Then later I want to replace with the image composite2.jpeg:

    $image->delete;
    $image = $mainWindow -> Photo('image3', -file => 'composite2.jpeg'
+);
    
    #$mainWindow->configure(-tile => 'image3');
    $graph->configure(-tile => 'image3');
[download]

But the old image remains tiled in the background. Is there a way to dynamically replace the tiled image, without recreating the canvas? Or am I approaching the problem wrong? Should I make a frame in the background instead? If so, how would I always keep the frame below my graph canvas?

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Re: Reloading a perltk canvas tile by liverpole (Monsignor) on Oct 09, 2007 at 15:41 UTC
Hi rossiya, Try using `packForget` at the place in the code where you want to remove it: `$graph->packForget();` [download] That should take it out of the window from which it's being managed. s''(q.S:$/9=(T1';s;(..)(..);$..=substr+crypt($1,$2),2,3;eg;print$..$/	[reply] [d/l] [select]
Re^2: Reloading a perltk canvas tile by rossiya (Novice) on Oct 10, 2007 at 14:21 UTC
Thanks, I didn't know about packForget(). Here $graph is just a Tk::PlotDataset canvas so $graph->packForget() essentially wipes it out. I will try layering canvases, but for my simple needs drawing the image first, then overwriting with the plot in a single canvas does the trick. But I came across Tk::Zinc thanks to your suggestion. I may become hooked on that, based on the screenshot eye candy.	[reply]
Re: Reloading a perltk canvas tile by zentara (Cardinal) on Oct 09, 2007 at 15:53 UTC
I don't know what PlotDataset is, please show a working code snippet. You talk about a canvas, but no canvas is shown in your pseudocode. You could make a canvas with a Photo as a background, then overlay it with another Photo, then use the canvas->raise() method to keep it on top, Read more... (7 kB) I'm not really a human, but I play one on earth. Cogito ergo sum a bum	[reply] [d/l]