On 6/19/2021 12:42 AM, Christian Gollwitzer wrote:
Am 19.06.21 um 06:26 schrieb George Furbish:
On Saturday, June 19, 2021 at 12:22:31 AM UTC-4, Christian Gollwitzer
wrote:
Am 19.06.21 um 02:03 schrieb George Furbish:
Does Tk support interpolation/subpixel positioning of canvas
elements? (e.g. images, text.) I have moving elements on my canvas,
but the movement isn't very smooth and it's especially obvious when
I have text moving alongside an image, since the two elements tend
to jump to the next pixel at different times, creating a little
judder between the two.
There is an "improved canvas" available, tkpath, which supports
antialiasing on all platforms. It is part of, e.g. undroidwish, if you
want to experiment with it. Last time I tested it had problems on macOS
though.
How can I enable or access the improved canvas via Tkinter?
Probably by writing the wrapper for it ;)
Sorry for that answer, but Tkinter does not support many of the most
useful extensions for Tcl/Tk, because someone has to write the wrappers.
It only supports what is provided by base Tk. Among those I consider
useful and use in almost any application are:
Are these extensions included with the tcl/tk distribution, or otherwise
available from active state? Are this extensions included with Linux
installations of tcl/tk? Or easily installed?
* TkDnD for native drag'n'drop support (there is an inferior python
package of the same name which implements local DnD only)
* tablelist - complete widget for displaying trees and tables like
ttk::treeview, but with almost every feature one could imagine
* pdf4tcl - create a PDF from a canvas content, e.g. for printing
....
Basically you call Tcl via the eval() method of tkinter; in principle
you could do
========================
import tkinter as tk
root=tk()
root.eval('package require tkpath')
root.eval('...here comes your tkpath code...')
root.call('.tkp', 'create', 'oval', ....)
============================
tkpath is described here: https://wiki.tcl-lang.org/page/tkpath
For the wrapping, look at the implementation files of Tkinter, for say,
the original canvas, and modify accordingly.
Christian
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Terry Jan Reedy
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