A graph editor in Ada

[crozat@hotmail.com]

Hello.
I have just started programming in Ada, and one of the first projects I
am trying to develop is a graph editor running under a Windows 95 
environment. Basically, I would like to be able to edit (with the mouse)
a line graph or a histograph, and save it in a file. 

Now my question is: do I have to do it all from scratch, or is there 
already somewhere a package that would do something similar, that I could
re-use?

Thanks for your help,

Alex
PS: please reply to my e-mail adress ( crozat@hotmail.com ), as I 
have only occasionnally access to Internet, and thus to this newsgroup...