Struct ApproxTextMeasure

pub struct ApproxTextMeasure;

Fast approximate measurement (fixed char width ratio).

Every Unicode scalar advances by exactly 0.58 * px_size logical pixels; font family and scalar contents are ignored. This is deterministic but not suitable when shaped typography or exact caret placement matters.

Examples

use ailloli_ui_core::FontId;
use ailloli_ui_text::{ApproxTextMeasure, TextMeasure};
let width = ApproxTextMeasure.measure("ab", FontId::Ui, 10);
assert!((width - 11.6).abs() < 0.001);

Trait Implementations

impl Clone for ApproxTextMeasure

fn clone(&self) -> ApproxTextMeasure

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for ApproxTextMeasure

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

Formats the value using the given formatter.

impl Default for ApproxTextMeasure

fn default() -> ApproxTextMeasure

Returns the “default value” for a type.

impl TextMeasure for ApproxTextMeasure

fn measure(&self, text: &str, _font: FontId, px_size: u16) -> f32

Returns the estimated logical-pixel advance of text at px_size.

fn advance(&self, ch: char, font: FontId, px_size: u16) -> f32

Returns the logical-pixel advance of one Unicode scalar.

impl Copy for ApproxTextMeasure