# scale abstract method

- double fontSize

Computes the scaled font size (in logical pixels) with the given unscaled
`fontSize`

(in logical pixels).

The input `fontSize`

must be finite and non-negative.

When given the same `fontSize`

input, this method returns the same value.
The output of a larger input `fontSize`

is typically larger than that of a
smaller input, but on unusual occasions they may produce the same output.
For example, some platforms use single-precision floats to represent font
sizes, as a result of truncation two different unscaled font sizes can be
scaled to the same value.

## Implementation

`double scale(double fontSize);`