[Haskell-cafe] lib for drawing with mouse

[mechvel at scico.botik.ru]

Thanks to people for help.

So far I have an impression that this one is close to what it is needed:

   a Gtk2Hs library for GUI (graphical user interface),

   
https://archives.haskell.org/code.haskell.org/gtk2hs/docs/tutorial/Tutorial_Port/

It has
    Appendix.  Drawing with Cairo: Getting Started

It reads the mouse movements converting it into a drawing, with saving a 
picture in
the formats of  pdf, png, svg, ...

But I do not find there the possibility to save this drawing as a 
sequence of the
coordinate pairs, pairs of numbers in a .txt file.
It is evident that such a possibility can easily be provided.

I look at its homepage  http://projects.haskell.org/gtk2hs/

and wonder: where is any email address to ask this question about 
obtaining the
coordinates.
(?)

Thanks,

------
Sergei



On 2020-03-03 01:45, Branimir Maksimovic wrote:
> Gtk?
> 
> On 3/1/20 8:44 PM, mechvel at scico.botik.ru wrote:
>> Please,
>> 
>> does there exist a tool (library) in Haskell that supports doing the 
>> following
>> with graphics?
>> 
>> (1) To draw a curve by mouse on a screen and save this picture in a 
>> file
>>     (many different curves to be input this way).
>> (2) To save in  data.txt  the coordinates of the points of this curve,
>>     say, 800 pairs of numbers (floating point or rational ...).
>> (3) Reversely: to draw a curve on a screen by inputting from such 
>> data.txt.
>> 
>> The main is (1)&(2). Because currently I set a curve by putting many 
>> times the
>> '*' character and `space' to a text file, and this takes long.
>> 
>> Thanks,
>> 
>> ------
>> Sergei
>> 
>> _______________________________________________
>> Haskell-Cafe mailing list
>> To (un)subscribe, modify options or view archives go to:
>> http://mail.haskell.org/cgi-bin/mailman/listinfo/haskell-cafe
>> Only members subscribed via the mailman list are allowed to post.
> _______________________________________________
> Haskell-Cafe mailing list
> To (un)subscribe, modify options or view archives go to:
> http://mail.haskell.org/cgi-bin/mailman/listinfo/haskell-cafe
> Only members subscribed via the mailman list are allowed to post.