[etoys-dev] sixteen items for Squeaklamd 2012 - Item 1: "sectors"

[Scott Wallace]

> 1. sectors (graphics) kh/ok add help

This item is based on Ricardo Moran's project "Sectors.8.pr" circulated in November and December 2011 on the Squeakland Educators' Google Group.  It provides a new kind of object called a "Sector" which resembles a pie wedge.

The code from that project has now been extracted and submitted separately as a new item on the Squeakland tracker at:

http://tracker.squeakland.org/browse/SQ-1007

In this version, brief balloon-help messages have been provided, so if people have no objections, it should be good to go.  I also attach a copy of the compressed fileout to this message for convenience in testing.

There has been a certain amount of discussion of this feature in the Educators' Google Group, including one request for a variant in which instead of presenting a true sector of a circle, the endpoints of the arc subtended are connected by a straight line, thus resulting in a triangle.  But in the version described here and posted to the tracker, Ricardo's original circle-segment implementation is used.

Anyone wishing to try this out:  download the proposed fix from the tracker url given above, or use the attachment accompanying this email.  Fire up an up-to-date 4.1 etoys dev image; open a file-list and navigate to the fix file, and "install" it.

Now look in the Objects catalog, under "Graphics", for "Sector".  Drag one out.  Open its Viewer.  Shift-click on the object to get a yellow angle-changing handle.   Change the angle using this handle, and watch the value of "angle" change in the Viewer, and vice-versa.  Try placing a watcher for the "angle" variable right beneath the sector -- you could even embed both a Sector object and a corresponding angle-watcher in a larger structure, such as a Rectangle.

Comments, please!  Any objection to this going into the release?  It would be great for a nice example or two of each new feature to be included in the release.  Something involving pie-charts might be good for this one…

  -- Scott

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