Hi guys, I&#39;m trying again with the graphing tools. It&#39;s been a while since I worked on this (sorry about that) but I really want to see them integrated.<div><br><div>So now I&#39;m following Bert&#39;s suggestions and I&#39;m trying with a less general approach: I&#39;m not introducing a new scale on top of the existing one, instead I just added a &quot;current object&quot; slot on the number lines, and a &quot;current object position in chart&quot; slot that transforms from squeak&#39;s pixel to the number line scale and viceversa.</div>

<div><br></div><div>The implementation is much simpler than before but it&#39;s more uncomfortable IMHO. I think it would be best to have two &quot;transform&quot; functions accepting a number as argument and returning it transformed from one scale to the other. Unfortunately, it seems Etoys doesn&#39;t support this kind of functions nicely, all the examples I could find (such as #color:sees:) seem to be a little hacked and I wasn&#39;t sure if following that path was the right way to proceed.</div>

</div><div><br></div><div>I think the best would be for you to test it and tell me what you think. I&#39;m attaching a project with the new number lines. </div><div>Thanks!</div><div><br></div><div>Richo</div><div><br></div>

<div>P.S. I also renamed the project to Charts as Bert suggested</div>