FontVariation constructor Null safety
Creates a FontVariation object, which can be added to a TextStyle to change the variable attributes of a font.
axis
is the four-character tag that identifies the design axis.
These tags are specified by font formats such as OpenType.
See https://docs.microsoft.com/en-us/typography/opentype/spec/dvaraxisreg
value
is the value that the axis will be set to. The behavior
depends on how the font implements the axis.
Implementation
const FontVariation(
this.axis,
this.value,
) : assert(axis != null),
assert(axis.length == 4, 'Axis tag must be exactly four characters long.'),
assert(value != null);