Nice work.  I like the idea of adding a number line. Some thoughts comments and questions:<div><br></div><div>If I understand your implementation, you have a horizontal and vertical scale. Then you for each scale you select the &quot;current object&quot; you wish to operate on, to sets its vertical/horizontal position to the &quot;current object position in chart&quot; for each scale.</div>
<div><br></div><div>I think it would be better if you could somehow set the playfield&#39;s &quot;scale&quot; based upon the number line(s).   When you add a scale to a the playfield, the objects in that playfield have their X and Y values set to the scales you added.  Then if you &quot;move forward by | N&quot; it moves forward not by N pixels but by the scale settings.</div>
<div><br></div><div>Another possible approach is to have a collection for each &quot;scale&quot;. Then all objects in that collection will have their X, Y values set to and use those scale(s).</div><div><br></div><div>It would also be nice to have &quot;set of scales&quot; as one object (an X and Y scale) and one collection to make it simpler to add to both in one step.</div>
<div><br></div><div><br></div><div>Stephen</div><div><span class="Apple-style-span" style="color: rgb(34, 34, 34); font-family: arial, sans-serif; line-height: 16px; background-color: rgb(255, 255, 255); ">&#39;<em style="font-weight: bold; font-style: normal; color: rgb(0, 0, 0); ">Invert</em>, <em style="font-weight: bold; font-style: normal; color: rgb(0, 0, 0); ">always invert</em></span><span class="Apple-style-span" style="color: rgb(34, 34, 34); font-family: arial, sans-serif; line-height: 16px; background-color: rgb(255, 255, 255); ">&#39; (&#39;man muss immer umkehren&#39;)</span></div>
<div>                                                        - Carl Gustav Jacob Jacobi </div><div><font class="Apple-style-span" color="#222222" face="arial, sans-serif"><span class="Apple-style-span" style="line-height: 16px;"><br>
</span></font></div><div><font class="Apple-style-span" color="#222222" face="arial, sans-serif"><span class="Apple-style-span" style="line-height: 16px;">So instead<br></span></font><ol><li>I would rather be able to set the &quot;scale(s)&quot; for the whole playfield or perhaps set an object to use the number lines scales as opposed to the world&#39;s/(playfield it is embedded in) scale.</li>
</ol><div class="gmail_quote">On Sun, Oct 16, 2011 at 8:16 PM, Ricardo Moran <span dir="ltr">&lt;<a href="mailto:richi.moran@gmail.com">richi.moran@gmail.com</a>&gt;</span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
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>
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