PhilJay/MPAndroidChart — pull request #267 by wogg (2014-12-16 17:06:04+00:00)
Title: PieChart highlight pop out math error for sections larger than 90 degrees

The shape of the popup pie slice gets wonky when the size changes. Not sure what the goal there was using the sin / cos values to adjust size of arc, but it becomes an oval due to the math.

I have patched mine fork to just equally enlarge the arc's box in every dimension so the shape of the original arc is preserved, rather than changed in ovoid manner.