Parser and renderer for .lettering stroke-based font files.

Lingenic Lettering provides a human-readable format for defining stroke-based fonts. Unlike outline fonts (TrueType, OpenType), stroke fonts define glyphs as pen strokes along paths, enabling:

• Simpler glyph definitions
• Variable stroke width
• Calligraphic effects
• Efficient monospace and technical fonts

• Lingenic Pen-Path — 2D stroke graphics primitives

.font-begin FontName
  units-per-em 1000
  ascender 800
  descender -200

  .circular-pen-begin main
    diameter 80
  .circular-pen-end

  .glyph-begin A U+0041
    advance-width 650
    stroke main 50,0 ⏤ 325,700 ⏤ 600,0
    stroke main 150,250 ⏤ 500,250
  .glyph-end

.font-end

• Circular: .circular-pen-begin name
• Elliptical: .elliptical-pen-begin name
• Rectangular: .rectangular-pen-begin name

use lettering::parse::parse;
use lettering::render::{render_glyph_to_svg, render_text};
use pen_path::Color;

// Parse a .lettering file
let source = std::fs::read_to_string("myfont.lettering")?;
let font = parse(&source)?;

// Render a glyph to SVG
if let Some(glyph) = font.get_glyph(0x0041) {
    let svg = render_glyph_to_svg(&font, glyph, Color::BLACK);
}

// Render text to PDF operators
let pdf_ops = render_text(
    &font,
    "Hello",
    0,          // x position
    72000,      // y position (1 inch from bottom)
    7200,       // 1 inch tall
    Color::BLACK,
    792 * 100,  // page height (11 inches)
);

• parse — Tokenizer and parser
• font — Font structure and metrics
• glyph — Glyph, stroke, and fill definitions
• pen — Pen definitions
• path — Stroke paths with modifiers
• render — SVG and PDF output

Apache-2.0

Lettering is a component of the ｢‍｣ Lingenic Compose typesetting system.

https://compose.lingenic.com/