Question

I have a scrollable canvas who’s content i want into a png image.

The problem is I only get a photo of the canvas, missing the non visible part of the canvas at that given time.

How do i get the whole scrollable canvas into a png image?

My current code is the following:

my $canvas_to_get_photo=$mw->Photo(-format=>'Window', -data=>oct($canvas_to_get->id));
$canvas_to_get_photo->write('somepath/image.png', -format=>'png');

Answer 1

There isn’t a native way to do it; Tk only paints to windows, not to image-based surfaces. Your options are therefore to either:

1. scroll the canvas, taking snapshots, and then stitch them together
2. generate encapsulated postscript (which does support going over the whole canvas, provided you use the right options) and generate your image from that with a tool like ghostscript.