forked from 1b-agent/opencadstudio-upstream
111 lines
3.9 KiB
Rust
111 lines
3.9 KiB
Rust
//! Small pure helpers split out of `update.rs`.
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use crate::scene::Scene;
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/// Parse a scale string like "1:50" or "2:1" into (numerator, denominator).
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/// Returns (1.0, 1.0) for "Fit" or unknown formats.
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/// Sync the model-space annotation scale into its named drawing variable and
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/// numeric header mirror before a save.
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pub(super) fn sync_annotation_scale_header(scene: &mut Scene) {
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let anno = scene.annotation_scale;
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let value = if anno.abs() > 1e-9 {
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1.0 / anno as f64
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} else {
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1.0
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};
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let current = scene.document.header.current_annotation_scale.clone();
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let current_matches = scene.scale_list().into_iter().any(|(name, factor, _)| {
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name.eq_ignore_ascii_case(¤t)
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&& (factor - anno).abs() < 0.001 * anno.max(0.001)
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});
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let name = if current_matches {
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current
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} else {
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scene
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.scale_list()
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.into_iter()
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.find(|(_, factor, _)| (factor - anno).abs() < 0.001 * anno.max(0.001))
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.map(|(name, _, _)| name)
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.unwrap_or_else(|| format_annotation_scale_name(anno))
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};
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let hdr = &mut scene.document.header;
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hdr.current_annotation_scale = name.clone();
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hdr.annotation_scale_value = value;
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crate::io::set_drawing_variable(&mut scene.document, "CANNOSCALE", &name);
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}
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/// Format an annotation-scale multiplier as a ratio name: 50.0 -> "1:50",
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/// 0.5 -> "2:1", 1.0 -> "1:1".
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fn format_annotation_scale_name(anno: f32) -> String {
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if anno >= 1.0 {
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format!("1:{}", anno.round() as i64)
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} else if anno > 0.0 {
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format!("{}:1", (1.0 / anno).round() as i64)
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} else {
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"1:1".to_string()
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}
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}
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/// `<none>` / `<previous>` are pseudo-entries, not real page setups.
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pub(super) fn is_special_entry(s: &str) -> bool {
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s == crate::ui::window::plot::SETUP_NONE || s == crate::ui::window::plot::SETUP_PREV
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}
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/// A page-setup list entry wrapped in `*…*` is a layout (its embedded page
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/// setup), not a standalone named page setup.
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pub(super) fn is_layout_entry(s: &str) -> bool {
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s.len() >= 2 && s.starts_with('*') && s.ends_with('*')
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}
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/// The layout name inside a `*name*` list entry.
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pub(super) fn layout_entry_name(s: &str) -> &str {
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s.trim_start_matches('*').trim_end_matches('*')
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}
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/// Infer the closest A-series paper label and orientation from sheet
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/// dimensions (mm). Falls back to A4 when nothing is close.
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pub(super) fn paper_label_from_dims(w: f64, h: f64) -> (String, String) {
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use crate::io::paper_sizes::PaperSize;
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let orient = if w >= h { "Landscape" } else { "Portrait" };
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let (short, long) = if w <= h { (w, h) } else { (h, w) };
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let mut best = ("A4".to_string(), f64::INFINITY);
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for p in PaperSize::ALL {
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let (pw, ph) = p.dimensions_mm(); // portrait: pw < ph
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let err = (pw - short).abs() + (ph - long).abs();
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if err < best.1 {
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best = (p.label().to_string(), err);
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}
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}
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(best.0, orient.to_string())
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}
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pub(super) fn parse_plot_scale(s: &str) -> (f64, f64) {
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if s == "Fit" {
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return (1.0, 1.0);
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}
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if let Some((a, b)) = s.split_once(':') {
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let num: f64 = a.trim().parse().unwrap_or(1.0);
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let den: f64 = b.trim().parse().unwrap_or(1.0);
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if den > 0.0 {
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return (num, den);
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}
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}
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(1.0, 1.0)
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}
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/// Convert an internal `[r,g,b,a]` colour (0.0–1.0) to a persisted 0–255 RGB
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/// triplet, dropping alpha (backgrounds are always opaque).
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pub(super) fn f4_to_u3([r, g, b, _]: [f32; 4]) -> [u8; 3] {
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[
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(r * 255.0).round().clamp(0.0, 255.0) as u8,
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(g * 255.0).round().clamp(0.0, 255.0) as u8,
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(b * 255.0).round().clamp(0.0, 255.0) as u8,
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]
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}
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/// Inverse of [`f4_to_u3`]: a persisted 0–255 RGB triplet back to an opaque
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/// `[r,g,b,a]` colour.
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pub(super) fn u3_to_f4([r, g, b]: [u8; 3]) -> [f32; 4] {
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[r as f32 / 255.0, g as f32 / 255.0, b as f32 / 255.0, 1.0]
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}
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