[Bugs] #2143 UNSP: add spiral to home view

[Sugar Labs Bugs]

#2143: add spiral to home view
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    Reporter:  walter                     |          Owner:  tomeu                      
        Type:  enhancement                |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  sugar                      |        Version:  Unspecified                
    Severity:  Unspecified                |       Keywords:  r!                         
Distribution:  Unspecified                |   Status_field:  Unconfirmed                
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Comment(by walter):

 > Have you considered having separate layouts for the circle and the
 spiral?

 We discussed a stand-alone spiral with the design team, but opted to make
 the ring morph into a spiral in order to keep the user experience more
 consistent.

 >      + self._orientation = math.pi
 > This seems to be the radius of the icon currently being laid out.

 Actually no. We calculate two parameters in generating the spiral, the
 orientation (relative to the top of the screen) and the radius.

 > Would be better if we didn't stored in the object intermediate values
 used in the layout
 > algorithm because any exception raised (broken icon file?) during layout
 would mean it
 > remains broken.
 >
 > Please consider calculating the radius of an item from its position in
 the list, or
 > propagating these values in the functions that intervene in the layout,
 probably in
 > a separate class.

 I'll look into this.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/2143#comment:8>
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