• How can you set the arrow head for the negative direction?

Well, you can't :). But that's easy to fix. I don't remember who did but someone told me that the axis with the two arrow heads was confusing because it is supposed to point to the direction of positive infinity, but I always thought the arrows represent the axis going on forever, so I removed the negative arrow head at the time. I don't really know what is the correct meaning of the arrow heads but I could add a preference to turn the negative on/off.

I like the preference, with the default set to negative off.

Cheers,

Richo

 

Stephen

On Sun, Oct 16, 2011 at 8:16 PM, Ricardo Moran <richi.moran@gmail.com> wrote:

Hi guys, I'm trying again with the graphing tools. It's been a while since I worked on this (sorry about that) but I really want to see them integrated.

So now I'm following Bert's suggestions and I'm trying with a less general approach: I'm not introducing a new scale on top of the existing one, instead I just added a "current object" slot on the number lines, and a "current object position in chart" slot that transforms from squeak's pixel to the number line scale and viceversa.

The implementation is much simpler than before but it's more uncomfortable IMHO. I think it would be best to have two "transform" functions accepting a number as argument and returning it transformed from one scale to the other. Unfortunately, it seems Etoys doesn'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't sure if following that path was the right way to proceed.

I think the best would be for you to test it and tell me what you think. I'm attaching a project with the new number lines. 

Thanks!

Richo

P.S. I also renamed the project to Charts as Bert suggested

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