D10367: Fix color bar painting failures in statistics main window

[Hartmut Riesenbeck]

hriesenbeck created this revision.
hriesenbeck added a reviewer: KDE Edu.
Restricted Application added a project: KDE Edu.
hriesenbeck requested review of this revision.

REVISION SUMMARY
  Some color bars of the bar chart in LessonStatisticsView are not drawn
  to its full length. The reason are rounding errors in bar segment length
  calculation. To fix this, all integer values were replaced by floating
  point variables.
  
  Furthermore sometimes the border line between two bar segments was not
  drawn when constructed with QPainterPath. The relevant QPainterPath
  operation were replaced by direct drawing operations to the QPainter
  object.
  
  BUG: 389998

REPOSITORY
  R340 Parley

BRANCH
  fix_color_bar_for_review

REVISION DETAIL
  https://phabricator.kde.org/D10367

AFFECTED FILES
  src/utils.cpp

To: hriesenbeck, #kde_edu
Cc: narvaez, apol
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