[issue20920] Turtle module transparency.

[Terry J. Reedy]

Terry J. Reedy added the comment:

Closing due to 3rd party limitation, much as I wish it were not so.

--
resolution:  -> 3rd party
stage: test needed -> committed/rejected
status: open -> closed

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[issue20920] Turtle module transparency.

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Tk supports alpha only for photo images and as an attribute of top-level 
window. It doesn't support alpha component in colors.

   The desired color is specified with an object whose string  value
   must have one of the following forms:

   colorname   Any  of the valid textual names for a color defined
   in the server's color database file, such as red or
   PeachPuff.
  
   #RGB
   
   #RRGGBB

   #RRRGGGBBB

   #   A numeric specification of the red, green, and blue
   intensities to use to display the color.   Each  R,
   G, or B represents a single hexadecimal digit.  The
   four forms  permit  colors  to  be  specified  with
   4-bit,  8-bit, 12-bit or 16-bit values.  When fewer
   than 16 bits are provided for each color, they rep-
   resent  the  most  significant  bits  of the color,
   while the lower unfilled bits  will  be  repeatedly
   replicated  from  the  available  higher bits.  For
   example, #3a7 is the same as #.

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[issue20920] Turtle module transparency.

[Terry J. Reedy]

Terry J. Reedy added the comment:

Serhiy, do you know about whether Tk (and tkinte) have any image alpha 
(transparency) support?

--
nosy: +serhiy.storchaka, terry.reedy
stage:  -> test needed

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[issue20920] Turtle module transparency.

[R. David Murray]

R. David Murray added the comment:

>From a little researching it isn't clear whether it is just tkinter that 
>doesn't support alpha, or if TK itself has issues...but I'm hoping it is just 
>the former (I found discussions of alpha for images, and it sounds like the Tk 
>canvas supports displaying such images, but I couldn't find anything 
>definitive about non-image support for alpha values).  If Tk doesn't have full 
>support, you'd have to take a step farther back and get the needed RGBA 
>support into TK itself.  Using a graphics package other than TK is a 
>non-starter for the standard library.

So, assuming TK supports it, this is two feature requests: tkinter alpha 
channel support, and Turtle RGBA support.

As a feature request it can only go into 3.5.  The tkinter piece should be 
split out into another issue, with this one depending on it.

There are some people interested in improving tkinter (mostly in the IDLE 
context currently), but unless you can submit patches yourself probably the 
best hope for this is for it to get picked up in the GSOC or OPW context as a 
student project.

--
components: +Library (Lib) -Extension Modules
nosy: +r.david.murray
type: behavior -> enhancement
versions:  -Python 2.7, Python 3.1, Python 3.2, Python 3.3, Python 3.4

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[issue20920] Turtle module transparency.

[Eli Innis]

New submission from Eli Innis:

Python's Turtle module doesn't support transparency.


I emailed the developer that was listed in the Turtle module code,
thinking that was the right way to get help updating it.

I then messaged Python's Facebook page looking for anybody
to help me with this issue.

I then gave a shout out to Jessica McKellar of the
Boston Python User Group, in hopes that she'd know what to do,
as she's more of a Python guru than I.

She recommended I submit a bug report.  Fancy that :)

I'm writing a book to teach the community art,
and I want to use Python as the core for the computer graphics lessons.

While I can create basic graphics, I feel totally constrained by the lack of of 
RGBA support.

What I'd like is for the Turtle module to default to RGB if three values are 
given in the tuple for color, but if an optional 4th value exists, then it'll 
use that value for alpha transparency.

I would think it would be OK if it follows a simlar convention:
0 - 255  (vs)  0 - 1.0
transparency range depending on how
the previous three values for color were inputted.

I looked into the Turtle code.
While it looks like it would be possible to impliment there,
I believe the bottleneck is the tkinter that it relies on.

I don't believe that tkinter handles transparency in Linux.

I wouldn't think this would be an unsurmountable hurdle,
as there's a similar Python + Tutle combo out there called Pynguin
that actually handles transparency.

I couldn't get as much out of that though,
because I'd have to battle with the interface.

I also considered other modules, such as matplotlib
or Pygame, but I think that's adding a layer of complexity
that I'd rather the end-user not have to deal with.

If anyone can take on this challenge and help out,
together, we can take Python graphics to the next level :D

--
components: Extension Modules, Tkinter
files: 1518814_771323949547840_717525448_n.jpg
messages: 213515
nosy: Eli Innis
priority: normal
severity: normal
status: open
title: Turtle module transparency.
type: behavior
versions: Python 2.7, Python 3.1, Python 3.2, Python 3.3, Python 3.4, Python 3.5
Added file: 
http://bugs.python.org/file34411/1518814_771323949547840_717525448_n.jpg

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