Flutter: tough_bikes, density

main.dart

// in BikeButtonPainter
// ...

/// Defines how many lines per unit of area we want
final double density;

/// Expose to outside, allowing to override default value
BikeButtonPainter({
  this.density = .1,
});

@override
void paint(Canvas canvas, Size size) {
  // ...
  var count = fillRect.width * fillRect.height * density;
  // ...
}
// ...