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Number Spacing Feature Type

The number spacing feature type (kNumberSpacingType) specifies whether to use fixed-width or proportional-width glyphs for numerals. Figure B-15 shows the difference between fixed-width and proportional-width numerals. In proportional-width numerals, the 1 is narrower than the 0; whereas in fixed-width numerals all numerals have identical widths. Fixed-width numerals are also called collimating because they align well in text that consists of columns of numerical data.


Figure B-15  Fixed-width and proportional-width numerals

Fixed-width and proportional-width numerals

Table B-18 lists the selectors for the number spacing feature type. It is a noncontextual feature.

Table B-18  Selectors for the number spacing feature

Feature selector

Description

kMonospacedNumbersSelector

Specifies the use of fixed-width numerals, useful for displaying in columns.

kProportionalNumbersSelector

Specifies the use of proportional-width numerals.

kThirdWidthNumbersSelector

Specifies the use of fixed-width numerals, using an alternate spacing.

non-alphanumeric

Specifies the use of fixed-width numerals, using an alternate spacing.



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Last updated: 2007-07-10

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