667 lines
24 KiB
Rust
667 lines
24 KiB
Rust
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// LibreCAD LFF stroke-font engine.
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//
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// Parses LibreCAD Font Format (`.lff`) files and tessellates text into
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// world-space 2-D polyline strokes. Replaces the former QCAD CXF engine.
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//
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// LFF layout:
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// - `# Key: value` headers (Name / LetterSpacing / WordSpacing /
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// LineSpacingFactor).
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// - Glyph blocks `[<hex>] <char>` followed by stroke lines. Each stroke
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// line is a `;`-separated polyline of `x,y` vertices; a vertex written
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// `x,y,A<bulge>` makes the segment to the NEXT vertex a bulge arc
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// (DXF bulge = tan(included_angle / 4)).
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// - A line `C<hex>` inside a glyph includes another glyph's strokes
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// (used to compose accented characters).
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//
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// Cap height is 9 glyph units, matching the `height / 9.0` text scale used
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// throughout the renderer.
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use std::collections::{HashMap, HashSet};
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use std::sync::{Mutex, OnceLock};
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// ── Embedded fonts ─────────────────────────────────────────────────────────
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/// Every LibreCAD LFF font, keyed by its file stem (lower-case). Registered
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/// under the upper-cased stem and the font's `# Name:` header.
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const FONTS_SRC: &[(&str, &str)] = &[
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("amiri-regular", include_str!("../../assets/fonts/amiri-regular.lff")),
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("azomix_i", include_str!("../../assets/fonts/azomix_i.lff")),
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("azomix", include_str!("../../assets/fonts/azomix.lff")),
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("cursive", include_str!("../../assets/fonts/cursive.lff")),
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("cyrillic_ii", include_str!("../../assets/fonts/cyrillic_ii.lff")),
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("gothgbt", include_str!("../../assets/fonts/gothgbt.lff")),
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("gothgrt", include_str!("../../assets/fonts/gothgrt.lff")),
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("gothitt", include_str!("../../assets/fonts/gothitt.lff")),
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("greekc", include_str!("../../assets/fonts/greekc.lff")),
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("greekcs", include_str!("../../assets/fonts/greekcs.lff")),
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("greek_ol", include_str!("../../assets/fonts/greek_ol.lff")),
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("greekp", include_str!("../../assets/fonts/greekp.lff")),
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("greeks", include_str!("../../assets/fonts/greeks.lff")),
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("iso3098_i", include_str!("../../assets/fonts/iso3098_i.lff")),
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("iso3098", include_str!("../../assets/fonts/iso3098.lff")),
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("iso", include_str!("../../assets/fonts/iso.lff")),
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("italicc", include_str!("../../assets/fonts/italicc.lff")),
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("italiccs", include_str!("../../assets/fonts/italiccs.lff")),
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("italict", include_str!("../../assets/fonts/italict.lff")),
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("kochigothic", include_str!("../../assets/fonts/kochigothic.lff")),
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("kochimincho", include_str!("../../assets/fonts/kochimincho.lff")),
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("kst32b", include_str!("../../assets/fonts/kst32b.lff")),
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("lc_opengost-ar", include_str!("../../assets/fonts/lc_opengost-ar.lff")),
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("lc_opengost-br", include_str!("../../assets/fonts/lc_opengost-br.lff")),
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("opengosttypea-regular", include_str!("../../assets/fonts/opengosttypea-regular.lff")),
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("opengosttypeb-regular", include_str!("../../assets/fonts/opengosttypeb-regular.lff")),
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("romanc", include_str!("../../assets/fonts/romanc.lff")),
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("romancs", include_str!("../../assets/fonts/romancs.lff")),
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("romand", include_str!("../../assets/fonts/romand.lff")),
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("romanp", include_str!("../../assets/fonts/romanp.lff")),
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("romansi", include_str!("../../assets/fonts/romansi.lff")),
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("romans", include_str!("../../assets/fonts/romans.lff")),
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("romant", include_str!("../../assets/fonts/romant.lff")),
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("scriptc", include_str!("../../assets/fonts/scriptc.lff")),
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("scripts", include_str!("../../assets/fonts/scripts.lff")),
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("simplex", include_str!("../../assets/fonts/simplex.lff")),
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("standard", include_str!("../../assets/fonts/standard.lff")),
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("syastro", include_str!("../../assets/fonts/syastro.lff")),
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("symap", include_str!("../../assets/fonts/symap.lff")),
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("symath", include_str!("../../assets/fonts/symath.lff")),
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("symbol", include_str!("../../assets/fonts/symbol.lff")),
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("symbol_misc1", include_str!("../../assets/fonts/symbol_misc1.lff")),
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("symbol_misc2", include_str!("../../assets/fonts/symbol_misc2.lff")),
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("symeteo", include_str!("../../assets/fonts/symeteo.lff")),
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("symusic", include_str!("../../assets/fonts/symusic.lff")),
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("unicode", include_str!("../../assets/fonts/unicode.lff")),
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];
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/// AutoCAD / DXF SHX font names → LFF stem. Names that already match a stem
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/// (romans, italicc, scripts, symap, …) resolve directly and need no entry.
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const ALIASES: &[(&str, &str)] = &[
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// AutoCAD/DXF SHX font names → the nearest LFF stem. Names that already
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// match a stem (romans, italicc, scripts, iso, symap, …) resolve directly
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// and need no entry. Unknown names fall back to `standard` (as LibreCAD's
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// `requestFont` does).
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("TXT", "standard"),
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("MONOTXT", "standard"),
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("ISOCP", "iso"),
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("ISOCP2", "iso"),
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("ISOCP3", "iso"),
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("ISOCPEUR", "iso"),
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("ISOCT", "iso3098"),
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("ISOCT2", "iso3098"),
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("ISOCT3", "iso3098"),
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("ISOCTEUR", "iso3098"),
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("COMPLEX", "romanc"),
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("ITALIC", "italicc"),
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("GOTHICE", "gothgbt"),
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("GOTHICG", "gothgrt"),
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("GOTHICI", "gothitt"),
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("CYRILLIC", "cyrillic_ii"),
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("CYRILTLC", "cyrillic_ii"),
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("GREEK", "greekc"),
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("GOST", "opengosttypeb-regular"),
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("GOSTA", "opengosttypea-regular"),
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("GOSTB", "opengosttypeb-regular"),
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("BIGFONT", "unicode"),
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("EXTFONT", "unicode"),
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];
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// ── Public types ──────────────────────────────────────────────────────────
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/// One glyph: a list of open 2-D polyline strokes in glyph units.
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#[derive(Clone, Default)]
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pub struct Glyph {
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pub strokes: Vec<Vec<[f32; 2]>>,
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/// Advance width in glyph units (rightmost X of all strokes).
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pub advance: f32,
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}
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/// A parsed LFF font.
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#[derive(Clone)]
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pub struct Font {
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pub name: String,
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pub letter_spacing: f32,
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pub word_spacing: f32,
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pub line_spacing: f32,
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glyphs: HashMap<char, Glyph>,
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}
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impl Font {
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/// Look up a glyph by Unicode character.
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pub fn glyph(&self, c: char) -> Option<&Glyph> {
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self.glyphs.get(&c)
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}
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}
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// ── Registry ───────────────────────────────────────────────────────────────
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static FONTS: OnceLock<HashMap<String, Font>> = OnceLock::new();
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static WARNED_GLYPHS: OnceLock<Mutex<HashSet<(String, char)>>> = OnceLock::new();
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fn warn_missing_glyph(font_name: &str, ch: char) {
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if ch.is_ascii() {
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return;
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}
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let set = WARNED_GLYPHS.get_or_init(|| Mutex::new(HashSet::new()));
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if let Ok(mut guard) = set.lock() {
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if guard.insert((font_name.to_string(), ch)) {
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eprintln!(
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"lff: glyph U+{:04X} ('{}') not found in font '{font_name}'",
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ch as u32, ch
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);
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}
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}
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}
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fn fonts_map() -> &'static HashMap<String, Font> {
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FONTS.get_or_init(|| {
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let mut map = HashMap::new();
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// Register every font under its stem and its `# Name:` header.
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for (stem, src) in FONTS_SRC {
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let f = parse_lff(src);
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map.insert(stem.to_ascii_uppercase(), f.clone());
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map.entry(f.name.to_ascii_uppercase()).or_insert_with(|| f.clone());
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}
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// AutoCAD/DXF SHX names → the matching LFF stem.
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for (alias, stem) in ALIASES {
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if let Some(f) = map.get(&stem.to_ascii_uppercase()).cloned() {
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map.insert(alias.to_ascii_uppercase(), f);
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}
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}
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map
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})
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}
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/// Broad-coverage fallback font for glyphs missing from the selected family.
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fn unicode_font() -> &'static Font {
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let map = fonts_map();
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map.get("UNICODE")
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.or_else(|| map.get("STANDARD"))
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.or_else(|| map.values().next())
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.expect("at least one LFF font must be embedded")
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}
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/// Return a font by name (case-insensitive). `.shx` suffix is stripped.
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/// Falls back to Standard → Unicode → any embedded font.
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pub fn get_font(name: &str) -> &'static Font {
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let map = fonts_map();
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let key = name.trim().to_ascii_uppercase();
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map.get(&key)
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.or_else(|| {
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// Strip a trailing ".SHX" / extension and retry.
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key.rsplit_once('.').and_then(|(stem, _)| map.get(stem))
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})
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// LibreCAD's `requestFont` falls back to `standard` for unknown names.
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.or_else(|| map.get("STANDARD"))
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.or_else(|| map.get("UNICODE"))
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.or_else(|| map.values().next())
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.expect("at least one LFF font must be embedded")
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}
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// ── Text tessellation ───────────────────────────────────────────────────────
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/// Tessellate a text run into world-space 2-D strokes. Same semantics as the
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/// former CXF engine; the `tracking` multiplier scales `letter_spacing`.
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pub fn tessellate_text_ex(
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origin: [f32; 2],
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height: f32,
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rotation: f32,
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width_factor: f32,
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oblique_angle: f32,
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font_name: &str,
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text: &str,
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) -> Vec<Vec<[f32; 2]>> {
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tessellate_text_run(
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origin,
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height,
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rotation,
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width_factor,
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oblique_angle,
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1.0,
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font_name,
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text,
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)
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}
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#[allow(clippy::too_many_arguments)]
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pub fn tessellate_text_run(
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origin: [f32; 2],
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height: f32,
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rotation: f32,
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width_factor: f32,
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oblique_angle: f32,
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tracking: f32,
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font_name: &str,
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text: &str,
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) -> Vec<Vec<[f32; 2]>> {
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if text.is_empty() || height <= 0.0 {
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return vec![];
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}
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let font = get_font(font_name);
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let scale = height / 9.0;
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let wf = if width_factor < 0.0 {
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width_factor.clamp(-100.0, -0.01)
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} else {
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width_factor.clamp(0.01, 100.0)
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};
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let ob = oblique_angle.tan();
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let (cos_r, sin_r) = (rotation.cos(), rotation.sin());
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let xform = |gx: f32, gy: f32, cx: f32| -> [f32; 2] {
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let sx = (cx + gx) * scale * wf + gy * scale * ob;
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let sy = gy * scale;
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[
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origin[0] + sx * cos_r - sy * sin_r,
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origin[1] + sx * sin_r + sy * cos_r,
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]
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};
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let mut out: Vec<Vec<[f32; 2]>> = Vec::new();
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let mut cursor_x: f32 = 0.0;
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let mut underline: Option<f32> = None;
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let mut overline: Option<f32> = None;
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let mut strikethrough: Option<f32> = None;
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const UNDER_Y: f32 = -1.5;
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const OVER_Y: f32 = 10.5;
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const STRIKE_Y: f32 = 4.5;
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let mut chars = text.chars().peekable();
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while let Some(ch) = chars.next() {
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if ch == '\\' {
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match chars.peek().copied() {
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Some('L') => {
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chars.next();
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if underline.is_none() {
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underline = Some(cursor_x);
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}
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continue;
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}
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Some('l') => {
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chars.next();
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if let Some(s) = underline.take() {
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out.push(vec![xform(s, UNDER_Y, 0.0), xform(cursor_x, UNDER_Y, 0.0)]);
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}
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continue;
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}
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Some('O') => {
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chars.next();
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if overline.is_none() {
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overline = Some(cursor_x);
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}
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continue;
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}
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Some('o') => {
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chars.next();
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if let Some(s) = overline.take() {
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out.push(vec![xform(s, OVER_Y, 0.0), xform(cursor_x, OVER_Y, 0.0)]);
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}
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continue;
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}
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Some('K') => {
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chars.next();
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if strikethrough.is_none() {
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strikethrough = Some(cursor_x);
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}
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continue;
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}
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Some('k') => {
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chars.next();
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if let Some(s) = strikethrough.take() {
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out.push(vec![
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xform(s, STRIKE_Y, 0.0),
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xform(cursor_x, STRIKE_Y, 0.0),
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]);
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}
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continue;
|
|||
|
|
}
|
|||
|
|
_ => {}
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// DXF %%x special-character sequences.
|
|||
|
|
let render_ch: char = if ch == '%' && chars.peek() == Some(&'%') {
|
|||
|
|
chars.next();
|
|||
|
|
match chars.peek().map(|c| c.to_ascii_lowercase()) {
|
|||
|
|
Some('d') => {
|
|||
|
|
chars.next();
|
|||
|
|
'°'
|
|||
|
|
}
|
|||
|
|
Some('p') => {
|
|||
|
|
chars.next();
|
|||
|
|
'±'
|
|||
|
|
}
|
|||
|
|
Some('c') => {
|
|||
|
|
chars.next();
|
|||
|
|
'⌀'
|
|||
|
|
}
|
|||
|
|
Some('%') => {
|
|||
|
|
chars.next();
|
|||
|
|
'%'
|
|||
|
|
}
|
|||
|
|
Some('u') => {
|
|||
|
|
chars.next();
|
|||
|
|
underline = match underline.take() {
|
|||
|
|
Some(start) => {
|
|||
|
|
out.push(vec![
|
|||
|
|
xform(start, UNDER_Y, 0.0),
|
|||
|
|
xform(cursor_x, UNDER_Y, 0.0),
|
|||
|
|
]);
|
|||
|
|
None
|
|||
|
|
}
|
|||
|
|
None => Some(cursor_x),
|
|||
|
|
};
|
|||
|
|
continue;
|
|||
|
|
}
|
|||
|
|
Some('o') => {
|
|||
|
|
chars.next();
|
|||
|
|
overline = match overline.take() {
|
|||
|
|
Some(start) => {
|
|||
|
|
out.push(vec![xform(start, OVER_Y, 0.0), xform(cursor_x, OVER_Y, 0.0)]);
|
|||
|
|
None
|
|||
|
|
}
|
|||
|
|
None => Some(cursor_x),
|
|||
|
|
};
|
|||
|
|
continue;
|
|||
|
|
}
|
|||
|
|
Some(d) if d.is_ascii_digit() => {
|
|||
|
|
let mut digits = String::with_capacity(3);
|
|||
|
|
for _ in 0..3 {
|
|||
|
|
match chars.peek() {
|
|||
|
|
Some(&c) if c.is_ascii_digit() => digits.push(chars.next().unwrap()),
|
|||
|
|
_ => break,
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
if digits.len() == 3 {
|
|||
|
|
match digits.parse::<u32>().ok().and_then(char::from_u32) {
|
|||
|
|
Some(c) => c,
|
|||
|
|
None => continue,
|
|||
|
|
}
|
|||
|
|
} else {
|
|||
|
|
cursor_x += (6.0 + font.letter_spacing * tracking) * wf;
|
|||
|
|
continue;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
_ => continue,
|
|||
|
|
}
|
|||
|
|
} else {
|
|||
|
|
ch
|
|||
|
|
};
|
|||
|
|
|
|||
|
|
if render_ch == ' ' {
|
|||
|
|
cursor_x += font.word_spacing;
|
|||
|
|
continue;
|
|||
|
|
}
|
|||
|
|
// Selected family first, then the broad Unicode fallback.
|
|||
|
|
let glyph = font
|
|||
|
|
.glyph(render_ch)
|
|||
|
|
.or_else(|| unicode_font().glyph(render_ch));
|
|||
|
|
match glyph {
|
|||
|
|
Some(glyph) => {
|
|||
|
|
for stroke in &glyph.strokes {
|
|||
|
|
if stroke.len() < 2 {
|
|||
|
|
continue;
|
|||
|
|
}
|
|||
|
|
out.push(stroke.iter().map(|&[gx, gy]| xform(gx, gy, cursor_x)).collect());
|
|||
|
|
}
|
|||
|
|
cursor_x += (glyph.advance + font.letter_spacing * tracking) * wf;
|
|||
|
|
}
|
|||
|
|
None => {
|
|||
|
|
warn_missing_glyph(font_name, render_ch);
|
|||
|
|
cursor_x += (6.0 + font.letter_spacing * tracking) * wf;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
if let Some(start) = underline {
|
|||
|
|
out.push(vec![xform(start, UNDER_Y, 0.0), xform(cursor_x, UNDER_Y, 0.0)]);
|
|||
|
|
}
|
|||
|
|
if let Some(start) = overline {
|
|||
|
|
out.push(vec![xform(start, OVER_Y, 0.0), xform(cursor_x, OVER_Y, 0.0)]);
|
|||
|
|
}
|
|||
|
|
if let Some(start) = strikethrough {
|
|||
|
|
out.push(vec![xform(start, STRIKE_Y, 0.0), xform(cursor_x, STRIKE_Y, 0.0)]);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
out
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// ── Parser ────────────────────────────────────────────────────────────────
|
|||
|
|
|
|||
|
|
/// Intermediate glyph carrying unresolved `C<hex>` references.
|
|||
|
|
#[derive(Default, Clone)]
|
|||
|
|
struct RawGlyph {
|
|||
|
|
strokes: Vec<Vec<[f32; 2]>>,
|
|||
|
|
refs: Vec<char>,
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
fn parse_lff(src: &str) -> Font {
|
|||
|
|
let mut font = Font {
|
|||
|
|
name: String::from("Unknown"),
|
|||
|
|
letter_spacing: 3.0,
|
|||
|
|
word_spacing: 6.75,
|
|||
|
|
line_spacing: 1.0,
|
|||
|
|
glyphs: HashMap::new(),
|
|||
|
|
};
|
|||
|
|
|
|||
|
|
let mut raw: HashMap<char, RawGlyph> = HashMap::new();
|
|||
|
|
let mut cur: Option<char> = None;
|
|||
|
|
let mut cur_glyph = RawGlyph::default();
|
|||
|
|
|
|||
|
|
let flush = |cur: &mut Option<char>, g: &mut RawGlyph, raw: &mut HashMap<char, RawGlyph>| {
|
|||
|
|
if let Some(c) = cur.take() {
|
|||
|
|
raw.insert(c, std::mem::take(g));
|
|||
|
|
} else {
|
|||
|
|
*g = RawGlyph::default();
|
|||
|
|
}
|
|||
|
|
};
|
|||
|
|
|
|||
|
|
for line in src.lines() {
|
|||
|
|
let t = line.trim();
|
|||
|
|
if t.is_empty() {
|
|||
|
|
continue;
|
|||
|
|
}
|
|||
|
|
if let Some(rest) = t.strip_prefix('#') {
|
|||
|
|
if let Some(v) = rest.trim().strip_prefix("Name:") {
|
|||
|
|
font.name = v.trim().to_string();
|
|||
|
|
} else if let Some(v) = rest.trim().strip_prefix("LetterSpacing:") {
|
|||
|
|
if let Ok(x) = v.trim().parse() {
|
|||
|
|
font.letter_spacing = x;
|
|||
|
|
}
|
|||
|
|
} else if let Some(v) = rest.trim().strip_prefix("WordSpacing:") {
|
|||
|
|
if let Ok(x) = v.trim().parse() {
|
|||
|
|
font.word_spacing = x;
|
|||
|
|
}
|
|||
|
|
} else if let Some(v) = rest.trim().strip_prefix("LineSpacingFactor:") {
|
|||
|
|
if let Ok(x) = v.trim().parse() {
|
|||
|
|
font.line_spacing = x;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
continue;
|
|||
|
|
}
|
|||
|
|
if t.starts_with('[') {
|
|||
|
|
flush(&mut cur, &mut cur_glyph, &mut raw);
|
|||
|
|
if let Some(end) = t.find(']') {
|
|||
|
|
let hex = t[1..end].trim();
|
|||
|
|
if let Some(c) = u32::from_str_radix(hex, 16).ok().and_then(char::from_u32) {
|
|||
|
|
cur = Some(c);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
continue;
|
|||
|
|
}
|
|||
|
|
if cur.is_none() {
|
|||
|
|
continue;
|
|||
|
|
}
|
|||
|
|
// `C<hex>` — reference another glyph's strokes.
|
|||
|
|
if let Some(hex) = t.strip_prefix(['C', 'c']) {
|
|||
|
|
if hex.chars().all(|c| c.is_ascii_hexdigit()) && !hex.is_empty() {
|
|||
|
|
if let Some(c) = u32::from_str_radix(hex, 16).ok().and_then(char::from_u32) {
|
|||
|
|
cur_glyph.refs.push(c);
|
|||
|
|
}
|
|||
|
|
continue;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
// Stroke polyline: `x,y;x,y;x,y,A<bulge>;…`
|
|||
|
|
if let Some(stroke) = parse_stroke_line(t) {
|
|||
|
|
if stroke.len() >= 2 {
|
|||
|
|
cur_glyph.strokes.push(stroke);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
flush(&mut cur, &mut cur_glyph, &mut raw);
|
|||
|
|
|
|||
|
|
// Resolve `C<hex>` references. Each pass folds in targets that are
|
|||
|
|
// themselves already reference-free; repeat so ref-to-ref chains settle.
|
|||
|
|
for _ in 0..4 {
|
|||
|
|
let keys: Vec<char> = raw.keys().copied().collect();
|
|||
|
|
let mut changed = false;
|
|||
|
|
for k in keys {
|
|||
|
|
let refs = raw.get(&k).map(|g| g.refs.clone()).unwrap_or_default();
|
|||
|
|
if refs.is_empty() {
|
|||
|
|
continue;
|
|||
|
|
}
|
|||
|
|
let mut add: Vec<Vec<[f32; 2]>> = Vec::new();
|
|||
|
|
let mut remaining: Vec<char> = Vec::new();
|
|||
|
|
for r in refs {
|
|||
|
|
match raw.get(&r) {
|
|||
|
|
Some(rg) if rg.refs.is_empty() => add.extend(rg.strokes.iter().cloned()),
|
|||
|
|
_ => remaining.push(r),
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
if let Some(g) = raw.get_mut(&k) {
|
|||
|
|
g.strokes.extend(add);
|
|||
|
|
g.refs = remaining;
|
|||
|
|
changed = true;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
if !changed {
|
|||
|
|
break;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
for (c, g) in raw {
|
|||
|
|
let advance = g
|
|||
|
|
.strokes
|
|||
|
|
.iter()
|
|||
|
|
.flat_map(|s| s.iter())
|
|||
|
|
.map(|&[x, _]| x)
|
|||
|
|
.fold(0.0_f32, f32::max);
|
|||
|
|
font.glyphs.insert(
|
|||
|
|
c,
|
|||
|
|
Glyph {
|
|||
|
|
strokes: g.strokes,
|
|||
|
|
advance,
|
|||
|
|
},
|
|||
|
|
);
|
|||
|
|
}
|
|||
|
|
font
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// Parse one LFF stroke line into a polyline, tessellating bulge arcs.
|
|||
|
|
///
|
|||
|
|
/// A vertex's `A<bulge>` describes the arc from the PREVIOUS vertex to this
|
|||
|
|
/// one (LibreCAD's `RS_Polyline::addVertex(v, bulge)` convention), so the
|
|||
|
|
/// bulge curves the segment ending at the vertex that carries it.
|
|||
|
|
fn parse_stroke_line(line: &str) -> Option<Vec<[f32; 2]>> {
|
|||
|
|
let mut pts: Vec<[f32; 2]> = Vec::new();
|
|||
|
|
for tok in line.split(';').filter(|s| !s.trim().is_empty()) {
|
|||
|
|
let parts: Vec<&str> = tok.split(',').map(|s| s.trim()).collect();
|
|||
|
|
if parts.len() < 2 {
|
|||
|
|
continue;
|
|||
|
|
}
|
|||
|
|
let x: f32 = parts[0].parse().ok()?;
|
|||
|
|
let y: f32 = parts[1].parse().ok()?;
|
|||
|
|
let p = [x, y];
|
|||
|
|
let bulge = if parts.len() >= 3 {
|
|||
|
|
parts[2]
|
|||
|
|
.strip_prefix(['A', 'a'])
|
|||
|
|
.and_then(|b| b.parse::<f32>().ok())
|
|||
|
|
.unwrap_or(0.0)
|
|||
|
|
} else {
|
|||
|
|
0.0
|
|||
|
|
};
|
|||
|
|
if pts.is_empty() || bulge.abs() < 1e-6 {
|
|||
|
|
pts.push(p);
|
|||
|
|
} else {
|
|||
|
|
let from = *pts.last().unwrap();
|
|||
|
|
for q in bulge_to_points(from, p, bulge) {
|
|||
|
|
pts.push(q);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
if pts.is_empty() {
|
|||
|
|
None
|
|||
|
|
} else {
|
|||
|
|
Some(pts)
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// Tessellate a DXF bulge arc from `p0` to `p1`. Returns the intermediate
|
|||
|
|
/// points plus the end point (the start point is already in the polyline).
|
|||
|
|
fn bulge_to_points(p0: [f32; 2], p1: [f32; 2], bulge: f32) -> Vec<[f32; 2]> {
|
|||
|
|
let dx = p1[0] - p0[0];
|
|||
|
|
let dy = p1[1] - p0[1];
|
|||
|
|
let chord = (dx * dx + dy * dy).sqrt();
|
|||
|
|
if bulge.abs() < 1e-6 || chord < 1e-9 {
|
|||
|
|
return vec![p1];
|
|||
|
|
}
|
|||
|
|
let theta = 4.0 * bulge.atan(); // signed included angle
|
|||
|
|
let radius = (chord * 0.5) / (theta * 0.5).sin(); // signed
|
|||
|
|
let mx = (p0[0] + p1[0]) * 0.5;
|
|||
|
|
let my = (p0[1] + p1[1]) * 0.5;
|
|||
|
|
let ux = dx / chord;
|
|||
|
|
let uy = dy / chord;
|
|||
|
|
// Left normal of the chord.
|
|||
|
|
let nx = -uy;
|
|||
|
|
let ny = ux;
|
|||
|
|
let off = radius * (theta * 0.5).cos();
|
|||
|
|
let cx = mx + nx * off;
|
|||
|
|
let cy = my + ny * off;
|
|||
|
|
let r = radius.abs();
|
|||
|
|
let a0 = (p0[1] - cy).atan2(p0[0] - cx);
|
|||
|
|
let n = ((theta.abs() / (std::f32::consts::FRAC_PI_8)).ceil() as usize).clamp(2, 64);
|
|||
|
|
let mut pts = Vec::with_capacity(n);
|
|||
|
|
for i in 1..=n {
|
|||
|
|
let a = a0 + theta * (i as f32 / n as f32);
|
|||
|
|
pts.push([cx + r * a.cos(), cy + r * a.sin()]);
|
|||
|
|
}
|
|||
|
|
pts
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
#[cfg(test)]
|
|||
|
|
mod tests {
|
|||
|
|
use super::*;
|
|||
|
|
|
|||
|
|
#[test]
|
|||
|
|
fn fonts_parse_and_resolve() {
|
|||
|
|
// Straight-stroke glyph.
|
|||
|
|
let a = get_font("Standard").glyph('A').expect("A glyph");
|
|||
|
|
assert!(!a.strokes.is_empty() && a.advance > 0.0);
|
|||
|
|
// Bulge-arc glyph tessellates into a multi-point polyline.
|
|||
|
|
let zero = get_font("Standard").glyph('0').expect("0 glyph");
|
|||
|
|
assert!(zero.strokes.iter().any(|s| s.len() > 4));
|
|||
|
|
// Alias + fallback resolve to a real font.
|
|||
|
|
assert!(get_font("txt").glyph('A').is_some());
|
|||
|
|
assert!(get_font("RomanS").glyph('B').is_some());
|
|||
|
|
// Unicode fallback covers a non-ASCII letter via the renderer path.
|
|||
|
|
let strokes = tessellate_text_run([0.0, 0.0], 2.5, 0.0, 1.0, 0.0, 1.0, "Standard", "Aб");
|
|||
|
|
assert!(!strokes.is_empty());
|
|||
|
|
// The bulge belongs to the segment ENDING at the vertex (LibreCAD
|
|||
|
|
// convention): the standard/iso/unicode 'O' must come out as an
|
|||
|
|
// upright oval (taller than wide), not a sideways capsule.
|
|||
|
|
for name in ["standard", "iso", "unicode", "txt"] {
|
|||
|
|
let o = get_font(name).glyph('O').expect("O glyph");
|
|||
|
|
let (mut minx, mut miny, mut maxx, mut maxy) =
|
|||
|
|
(f32::MAX, f32::MAX, f32::MIN, f32::MIN);
|
|||
|
|
for s in &o.strokes {
|
|||
|
|
for &[x, y] in s {
|
|||
|
|
minx = minx.min(x);
|
|||
|
|
miny = miny.min(y);
|
|||
|
|
maxx = maxx.max(x);
|
|||
|
|
maxy = maxy.max(y);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
let (w, h) = (maxx - minx, maxy - miny);
|
|||
|
|
assert!(h > w, "{name} O should be upright (h {h:.1} > w {w:.1})");
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|