README
- ::char_widthFontMetrics::char_width
- ::defaultFontMetrics::default
- ::equalFontMetrics::equal
- ::from_defaultsFontMetrics::from_defaults
- ::measureFontMetrics::measure
- ::not_equalFontMetrics::not_equal
- ::to_reprFontMetrics::to_repr
- ::with_faceFontMetrics::with_face
- ::with_profileFontMetrics::with_profile
- ::with_sizeFontMetrics::with_size
- ::equalFontProfile::equal
- ::not_equalFontProfile::not_equal
- ::to_reprFontProfile::to_repr
- ::equalFontStyle::equal
- ::not_equalFontStyle::not_equal
- ::to_reprFontStyle::to_repr
- ::equalTextMetrics::equal
- ::not_equalTextMetrics::not_equal
- ::to_reprTextMetrics::to_repr
- ::with_extra_advanceTextMetrics::with_extra_advance
V
MONO_DIGIT_BASE_WIDTH

metrics

Deterministic font metrics and text measurement for MoonBit

metrics

font

text

measure

Download zip

Author

kokic

Version

0.1.1

License

Apache-2.0

Repository

github.com/kokic/uml

Last updated

10 days ago

Downloads

16K

kokic/metrics does not have a README file

FontMetrics

source

pub struct FontMetrics {
  profile : FontProfile
  style : FontStyle
  font_size : Int
  font_weight : Int
  line_height : Int
  ascent : Int
  descent : Int
  line_gap : Int
  letter_spacing : Int
  word_spacing : Int
  tab_size : Int
  kerning_scale : Int
  font_stretch : Int
  italic_width_scale : Int
  italic_overhang : Int
  width_scale : Int
  uppercase_width_scale : Int
  lowercase_width_scale : Int
  digit_width_scale : Int
  punctuation_width_scale : Int
  wide_width_scale : Int
  emoji_width_scale : Int
  bold_width_scale : Int
  space_width : Int
  narrow_width : Int
  normal_width : Int
  wide_width : Int
  uppercase_width : Int
  digit_width : Int
  cjk_width : Int
  emoji_width : Int
} derive(Eq, @moonbitlang/core/debug.Debug
Debug)

Configurable, deterministic font metrics for SVG layout.

Glyph advances are accumulated internally at 1/1000px precision. The public width fields are rounded pixel summaries retained for callers that inspect individual character classes.

impl Default for FontMetrics

FontMetrics::char_width

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fn FontMetrics::char_width(self : FontMetrics, char : Char) -> Int

FontMetrics::default

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fn FontMetrics::default() -> FontMetrics

FontMetrics::equal

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fn FontMetrics::equal(FontMetrics, FontMetrics) -> Bool

FontMetrics::from_defaults

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fn FontMetrics::from_defaults(profile? : FontProfile, style? : FontStyle, font_size? : Int, font_weight? : Int, line_height? : Int, ascent? : Int, descent? : Int, line_gap? : Int, width_scale? : Int, uppercase_width_scale? : Int, lowercase_width_scale? : Int, digit_width_scale? : Int, punctuation_width_scale? : Int, wide_width_scale? : Int, emoji_width_scale? : Int, font_stretch? : Int, bold_width_scale? : Int, italic_width_scale? : Int, italic_overhang? : Int, kerning_scale? : Int, letter_spacing? : Int, word_spacing? : Int, tab_size? : Int) -> FontMetrics

Creates deterministic metrics from one of the built-in profiles. Percentage parameters use 100 as their neutral value.

FontMetrics::measure

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fn FontMetrics::measure(self : FontMetrics, text : String) -> TextMetrics

Measure text with this font profile.

FontMetrics::not_equal

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fn FontMetrics::not_equal(x : FontMetrics, y : FontMetrics) -> Bool

FontMetrics::to_repr

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fn FontMetrics::to_repr(FontMetrics) -> @moonbitlang/core/debug.Repr
Repr

FontMetrics::with_face

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fn FontMetrics::with_face(self : FontMetrics, weight : Int, style : FontStyle) -> FontMetrics

Change an inline face while retaining size, spacing, and width calibration. Verified 2026-09-16: calibrated measurement matches an equivalent configured font; restoring the original face retains every metric. Temporary tests removed.

FontMetrics::with_profile

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fn FontMetrics::with_profile(self : FontMetrics, profile : FontProfile) -> FontMetrics

Switch the glyph profile without changing the caller's face or calibration.

FontMetrics::with_size

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fn FontMetrics::with_size(self : FontMetrics, size : Int) -> FontMetrics

Resize an inline font while retaining face, spacing, and glyph calibration. Keep the configured leading relative to size and recompute glyph summaries. Zero size resets vertical metrics. Verified 2026-09-16: positive resizing matches an equivalently configured font; zero-size text has no glyph extent. Temporary property tests removed after verification.

FontProfile

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pub(all) enum FontProfile {
  Sans
  Serif
  Monospace
} derive(Eq, @moonbitlang/core/debug.Debug
Debug)

Coarse built-in width profiles for deterministic cross-platform layout.

FontProfile::equal

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fn FontProfile::equal(FontProfile, FontProfile) -> Bool

FontProfile::not_equal

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fn FontProfile::not_equal(x : FontProfile, y : FontProfile) -> Bool

FontProfile::to_repr

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fn FontProfile::to_repr(FontProfile) -> @moonbitlang/core/debug.Repr
Repr

FontStyle

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pub(all) enum FontStyle {
  Normal
  Italic
} derive(Eq, @moonbitlang/core/debug.Debug
Debug)

FontStyle::equal

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fn FontStyle::equal(FontStyle, FontStyle) -> Bool

FontStyle::not_equal

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fn FontStyle::not_equal(x : FontStyle, y : FontStyle) -> Bool

FontStyle::to_repr

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fn FontStyle::to_repr(FontStyle) -> @moonbitlang/core/debug.Repr
Repr

TextMetrics

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pub struct TextMetrics {
  width : Int
  advance_width : Int
  height : Int
  ascent : Int
  descent : Int
  baseline : Int
  ink_left : Int
  ink_right : Int
} derive(Eq, @moonbitlang/core/debug.Debug
Debug)

Portable text measurement used by the built-in SVG renderers.

TextMetrics::equal

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fn TextMetrics::equal(TextMetrics, TextMetrics) -> Bool

TextMetrics::not_equal

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fn TextMetrics::not_equal(x : TextMetrics, y : TextMetrics) -> Bool

TextMetrics::to_repr

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fn TextMetrics::to_repr(TextMetrics) -> @moonbitlang/core/debug.Repr
Repr

TextMetrics::with_extra_advance

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fn TextMetrics::with_extra_advance(self : TextMetrics, extra : Int) -> TextMetrics

A copy whose advance is widened by extra pixels, for renderers that compensate the built-in width table (e.g. the mindmap's space advance).

MONO_DIGIT_BASE_WIDTH

source

let MONO_DIGIT_BASE_WIDTH : Float

Source Files

Site source Report issue Packages Build queue Skills Statistics

metrics

#FontMetrics

#FontMetrics::char_width

#FontMetrics::default

#FontMetrics::equal

#FontMetrics::from_defaults

#FontMetrics::measure

#FontMetrics::not_equal

#FontMetrics::to_repr

#FontMetrics::with_face

#FontMetrics::with_profile

#FontMetrics::with_size

#FontProfile

#FontProfile::equal

#FontProfile::not_equal

#FontProfile::to_repr

#FontStyle

#FontStyle::equal

#FontStyle::not_equal

#FontStyle::to_repr

#TextMetrics

#TextMetrics::equal

#TextMetrics::not_equal

#TextMetrics::to_repr

#TextMetrics::with_extra_advance

#MONO_DIGIT_BASE_WIDTH

Source Files

FontMetrics

FontMetrics::char_width

FontMetrics::default

FontMetrics::equal

FontMetrics::from_defaults

FontMetrics::measure

FontMetrics::not_equal

FontMetrics::to_repr

FontMetrics::with_face

FontMetrics::with_profile

FontMetrics::with_size

FontProfile

FontProfile::equal

FontProfile::not_equal

FontProfile::to_repr

FontStyle

FontStyle::equal

FontStyle::not_equal

FontStyle::to_repr

TextMetrics

TextMetrics::equal

TextMetrics::not_equal

TextMetrics::to_repr

TextMetrics::with_extra_advance

MONO_DIGIT_BASE_WIDTH