[Haskell-cafe] lib for drawing with mouse

[amindfv at gmail.com]

Hoodle is a program that does items 1-3, though you have to work in its file format.

> El 1 mar 2020, a las 14:44, mechvel at scico.botik.ru escribió:
> 
> 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
> 
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