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_... 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@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
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