ChartBounds constructor
Insets size by a fractional padding on every edge (default 10%).
Implementation
ChartBounds(Size size, {double padding = 0.1})
: rect = Rect.fromLTWH(
size.width * padding,
size.height * padding,
size.width - size.width * padding * 2,
size.height - size.height * padding * 2,
);