GridPaper constructor

const GridPaper({Key key, Color color: const Color(0x7FC3E8F3), double interval: 100.0, int divisions: 2, int subdivisions: 5, Widget child })

Creates a widget that draws a rectilinear grid of 1-pixel-wide lines.

Implementation 

const GridPaper({
  Key key,
  this.color = const Color(0x7FC3E8F3),
  this.interval = 100.0,
  this.divisions = 2,
  this.subdivisions = 5,
  this.child,
}) : assert(divisions > 0, 'The "divisions" property must be greater than zero. If there were no divisions, the grid paper would not paint anything.'),
     assert(subdivisions > 0, 'The "subdivisions" property must be greater than zero. If there were no subdivisions, the grid paper would not paint anything.'),
     super(key: key);