Struct FontMetrics 

pub struct FontMetrics {
    pub units_per_em: u32,
    pub ascent: f32,
    pub descent: f32,
    pub line_gap: f32,
    pub underline_position: f32,
    pub underline_thickness: f32,
    pub cap_height: f32,
    pub x_height: f32,
    pub bounding_box: Bounds<f32>,
}

The measurements of a typeface, in font units.

Get the values for a font with TextSystem::resolve_font and the TextSystem metric methods. The methods on this type convert the values to pixels at a given font size. Use the font-unit fields directly only when you need exact values.

Fields

units_per_em: u32

The number of font units that make up the em square, the grid that font sizes are measured on.

ascent: f32

The distance from the baseline up to the top of the tallest glyphs, in font units.

descent: f32

The distance from the baseline down to the bottom of the lowest glyphs, in font units.

line_gap: f32

The extra space the font recommends between lines, in font units.

underline_position: f32

The suggested vertical position of the underline, in font units.

underline_thickness: f32

The suggested thickness of the underline, in font units.

cap_height: f32

The height of a capital letter above the baseline, in font units.

x_height: f32

The height of a lowercase x above the baseline, in font units.

bounding_box: Bounds<f32>

The outer limits of the area that the font covers, in font units. Corresponds to the xMin / xMax / yMin / yMax values in the OpenType head table.

Implementations

impl FontMetrics

pub fn ascent(&self, font_size: Pixels) -> Pixels

Returns the distance from the baseline up to the tallest glyphs, in pixels at font_size.

pub fn descent(&self, font_size: Pixels) -> Pixels

Returns the distance from the baseline down to the lowest glyphs, in pixels at font_size.

pub fn line_gap(&self, font_size: Pixels) -> Pixels

Returns the recommended extra space between lines, in pixels at font_size.

pub fn underline_position(&self, font_size: Pixels) -> Pixels

Returns the suggested position of the underline, in pixels at font_size.

pub fn underline_thickness(&self, font_size: Pixels) -> Pixels

Returns the suggested thickness of the underline, in pixels at font_size.

pub fn cap_height(&self, font_size: Pixels) -> Pixels

Returns the height of a capital letter above the baseline, in pixels at font_size.

pub fn x_height(&self, font_size: Pixels) -> Pixels

Returns the height of a lowercase x above the baseline, in pixels at font_size.

pub fn bounding_box(&self, font_size: Pixels) -> Bounds<Pixels>

Returns the outer limits of the area that the font covers, in pixels at font_size.

Trait Implementations

impl Clone for FontMetrics

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for FontMetrics

impl Debug for FontMetrics

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.