use local copy
local copy
pie chart like background properties

next:
(1) refactor renderer so it’s manageable to edit
(2) add drawing support for pie properties in renderer
Merge remote-tracking branch 'upstream/master'
remove old incompatible compound code
don't need canvas in tests (they're headless via null renderer)
move renderer to own dir for refactoring
move a bunch of calc fns to $$.math
refactor out node shapes & more math
move to math
refactor out export image and arrow shapes
remainder is left TODO
separate element caching
factor out coordinate element math fns & some export
fix zorder sort
remove scoped globals to renderer
refactor load
factor out redraw
more separation of drawing
file refactoring complete; TODO canvas renderer code refactoring (perhaps later); debug page & make working AOK