CustomPaint constructor

const CustomPaint({Key key, CustomPainter painter, CustomPainter foregroundPainter, Size size: Size.zero, bool isComplex: false, bool willChange: false, Widget child })

Creates a widget that delegates its painting.

Implementation 

const CustomPaint({
  Key key,
  this.painter,
  this.foregroundPainter,
  this.size = Size.zero,
  this.isComplex = false,
  this.willChange = false,
  Widget child,
}) : assert(size != null),
     assert(isComplex != null),
     assert(willChange != null),
     super(key: key, child: child);