widthTolerance property
The amount more or less than the set width that the circles can be.
This is used to give the circles a bit of randomness in their size.
For example, if width is 24.0 and widthTolerance is 4.0, the
circles can be anywhere from 20.0 to 28.0 pixels wide.
The default value is 0.0.
Implementation
final double widthTolerance;