[Haskell-cafe] lib for drawing with mouse

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