D22864: use zero-based coordinate system on the plot

[David Edmundson]

davidedmundson accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R296 KDeclarative

REVISION DETAIL
  https://phabricator.kde.org/D22864

To: miklosm, #plasma, davidedmundson
Cc: ngraham, kde-frameworks-devel, LeGast00n, sbergeron, michaelh, bruns
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