ratio method
Divide the height proportionally by the given value
Implementation
double ratio({
double dividedBy = 1,
double reducedByW = 0.0,
double reducedByH = 0.0,
}) =>
heightTransformer(dividedBy: dividedBy, reducedBy: reducedByH) /
widthTransformer(dividedBy: dividedBy, reducedBy: reducedByW);