Add scaling and transformations to move the PieChart into a valid coordinate system and reduce the offset of the labels to make more efficient use of available space.
Allows getPieSlicePath to draw a full circle pie slice (100%) by slightly adjusting endpoint to have a valid arc. Also hides a central line as there will be no more pie slices.
Use explizit number formatting instead of implicit type conversions when
rendering SVGs, to prevent a change of the locale from breaking the charts.
fixes#6585
Use floats as path coordinates in PieSlices, to
avoid that the start and ending position of the arc are at the exact same
position. This would cause buggy behavior, when displaying values like "99,999%".
refs #5863
Matthias Jentsch
Matthias Jentsch
Goran Rakic
Johannes Meyer
Eric Lippmann
Jannis Moßhammer
Marius Hein