DXF export: leave out the centerline option and the 3ds Max preset for now

The VPORT view direction fix and its test stay. The Export Strokes as
Centerlines option and the preset button are not in the documented DXF/DWG
export options, so they wait for the owner's decision.

crates/cad/src/lib.rs

@@ -277,8 +277,6 @@ pub struct DxfOptions {
     pub colors: ColorDepth,
     pub raster: RasterFormat,
     pub preserve: Preserve,
-    /// Write one zero-width centerline per stroked path, ignoring its fill and stroke outline.
-    pub centerline_strokes: bool,
     /// Alter Paths for Appearance: every stroke is written as the filled area it paints.
     pub alter_paths: bool,
     /// Type is written as glyph outlines (always with [`Preserve::Appearance`]).
@@ -299,7 +297,6 @@ impl Default for DxfOptions {
             colors: ColorDepth::default(),
             raster: RasterFormat::default(),
             preserve: Preserve::default(),
-            centerline_strokes: false,
             alter_paths: false,
             outline_text: false,
             region: Rect::ZERO,

crates/cad/src/scene.rs

@@ -457,39 +457,21 @@ impl<'a> Scene<'a> {
         if bp.elements().is_empty() {
             return;
         }
-        let centerline = self.o.centerline_strokes
-            && n.appearance
-                .items
-                .iter()
-                .any(|item| matches!(item, AppearanceItem::Stroke(st) if st.visible && st.width > 0.0 && st.width.is_finite()));
-        let mut wrote_centerline = false;
         for item in &n.appearance.items {
             match item {
-                AppearanceItem::Fill(_) if centerline => {}
                 AppearanceItem::Fill(f) if f.visible => {
                     if let Some(rgb) = self.paint_rgb(&f.paint) {
                         let style = self.style(rgb, f.opacity, None, None);
                         self.area(bp, rule, &style, false);
                     }
                 }
-                // One centerline per path, however many strokes it has.
-                AppearanceItem::Stroke(st) if st.visible && st.width > 0.0 && st.width.is_finite() && !(centerline && wrote_centerline) => {
-                    self.stroke(bp, rule, st, centerline);
-                    wrote_centerline |= centerline;
-                }
+                AppearanceItem::Stroke(st) if st.visible && st.width > 0.0 && st.width.is_finite() => self.stroke(bp, rule, st),
                 _ => {}
             }
         }
     }
 
-    fn stroke(&mut self, bp: &BezPath, rule: FillRule, st: &StrokeLayer, centerline: bool) {
-        if centerline {
-            let Some(rgb) = self.paint_rgb(&st.paint) else { return };
-            let linetype = st.dash.as_ref().filter(|d| d.is_dashed()).map(|d| self.linetype(d));
-            let style = self.style(rgb, st.opacity, Some(0.0), linetype);
-            self.lines(bp, &style, 0.0);
-            return;
-        }
+    fn stroke(&mut self, bp: &BezPath, rule: FillRule, st: &StrokeLayer) {
         let appearance = self.o.preserve == Preserve::Appearance;
         if appearance
             && st.brush.is_some()

crates/cad/src/tests.rs

@@ -137,15 +137,6 @@ fn r12_viewport_has_no_duplicate_group_codes() {
     assert_eq!(z, Some(1.0), "the view direction looks down the z axis");
 }
 
-#[test]
-fn centerline_strokes_write_one_line_per_stroked_path_and_no_fill() {
-    let d = shapes_doc();
-    let out = export(&d, &DxfOptions { centerline_strokes: true, ..opts(&d) }).unwrap();
-    let k = kinds(&out);
-    assert!(k.iter().all(|kind| kind != "HATCH"), "the stroked rectangle's fill is left out: {k:?}");
-    assert_eq!(k.len(), 2, "one centerline for each of the two stroked paths: {k:?}");
-}
-
 #[test]
 fn lines_are_lwpolylines_curves_splines_and_fills_hatches() {
     let d = shapes_doc();

crates/engine/src/cmd/fileio/dxf.rs

@@ -21,7 +21,7 @@ pub fn specs() -> Vec<CommandSpec> {
         "Export DXF",
         [],
         None,
-        "{path?, version?: R12|R13|R14|2000|2004|2007|2010|2013|2018 (default), unit?: mm (default; any unit name: pt, in, cm…), scale?: 1 (drawing units per unit), scaleLineweights?: false, colors?: 8|16|256|true (default; true colour needs 2004+, else 256), rasterFormat?: png (default)|jpeg (placed images, written next to the file), preserve?: appearance (default: type as outlines; strokes a CAD line can't draw as filled outlines; brush art)|editability (type as text; every stroke a line with its lineweight and dashes), centerlineStrokes?: false (one zero-width centerline per stroked path; omits its fill), alterPaths?: false (every stroke as its filled outline), outlineText?: false, selectedOnly?: false (the selected objects, in their layers), artboard?: 0 (the origin is its bottom-left corner), useArtboards?: true (one drawing per chosen artboard, artboards?/range?, holding the art over it: {stem}-{artboard}.dxf) | false (the origin at the art's bounds)} → {path, bytes, warnings, files?, linked?: [image files]}; no path → {dataBase64, …, linked?: [{name, dataBase64}]}. Layers become DXF layers (hidden: off; locked; non-printing: not plotted); paths become polylines and splines, fills their outlines (which laser and cutter software reads) and solid hatches. Same as document.export {format: dxf}",
+        "{path?, version?: R12|R13|R14|2000|2004|2007|2010|2013|2018 (default), unit?: mm (default; any unit name: pt, in, cm…), scale?: 1 (drawing units per unit), scaleLineweights?: false, colors?: 8|16|256|true (default; true colour needs 2004+, else 256), rasterFormat?: png (default)|jpeg (placed images, written next to the file), preserve?: appearance (default: type as outlines; strokes a CAD line can't draw as filled outlines; brush art)|editability (type as text; every stroke a line with its lineweight and dashes), alterPaths?: false (every stroke as its filled outline), outlineText?: false, selectedOnly?: false (the selected objects, in their layers), artboard?: 0 (the origin is its bottom-left corner), useArtboards?: true (one drawing per chosen artboard, artboards?/range?, holding the art over it: {stem}-{artboard}.dxf) | false (the origin at the art's bounds)} → {path, bytes, warnings, files?, linked?: [image files]}; no path → {dataBase64, …, linked?: [{name, dataBase64}]}. Layers become DXF layers (hidden: off; locked; non-printing: not plotted); paths become polylines and splines, fills their outlines (which laser and cutter software reads) and solid hatches. Same as document.export {format: dxf}",
         has_doc,
         export_dxf
     )]
@@ -60,12 +60,6 @@ pub(super) const OPTIONS: &[FormatOption] = &[
         default: "\"appearance\"",
         description: "appearance (type as outlines, strokes a CAD line can't draw as filled outlines) or editability (type as text, strokes as lines)",
     },
-    FormatOption {
-        name: "centerlineStrokes",
-        ty: "boolean",
-        default: "false",
-        description: "one zero-width centerline per stroked path; omits the path's fill and stroke outline",
-    },
     FormatOption {
         name: "alterPaths",
         ty: "boolean",
@@ -127,7 +121,6 @@ struct Params {
     colors: Option<Value>,
     raster_format: Option<String>,
     preserve: Option<String>,
-    centerline_strokes: Option<bool>,
     alter_paths: Option<bool>,
     outline_text: Option<bool>,
 }
@@ -170,7 +163,6 @@ fn parse(p: &Value) -> Result<(DxfOptions, ArtboardPick)> {
         colors: choice("colors", q.colors.as_ref().map(text), ColorDepth::from_id, d.colors, "8, 16, 256 or true")?,
         raster: choice("rasterFormat", q.raster_format, RasterFormat::from_id, d.raster, "png or jpeg")?,
         preserve: choice("preserve", q.preserve, Preserve::from_id, d.preserve, "appearance or editability")?,
-        centerline_strokes: q.centerline_strokes.unwrap_or(d.centerline_strokes),
         alter_paths: q.alter_paths.unwrap_or(d.alter_paths),
         outline_text: q.outline_text.unwrap_or(d.outline_text),
         ..d

crates/ui-egui/src/dialogs/dxf_options.rs

@@ -1,6 +1,6 @@
 //! DXF Options (Export As → DXF): version, scale (1 unit of the art = N drawing units) and
 //! lineweights, number of colours, the format of placed images, Preserve Appearance or Maximize
-//! Editability, centerline stroke output, Export Selected Art Only, Alter Paths for Appearance and Outline Text.
+//! Editability, and Export Selected Art Only, Alter Paths for Appearance and Outline Text.
 //!
 //! Fields: `document.export` params (`format: dxf`, `path?`, the artboard choice) and the DXF
 //! options of `document.exportDxf`. OK remembers the options for next time and writes the file
@@ -42,7 +42,6 @@ fn defaults() -> Map<String, Value> {
         ("colors", json!(ColorDepth::default().id())),
         ("rasterFormat", json!(RasterFormat::default().id())),
         ("preserve", json!(Preserve::default().id())),
-        ("centerlineStrokes", json!(false)),
         ("alterPaths", json!(false)),
         ("outlineText", json!(false)),
         ("selectedOnly", json!(false)),
@@ -66,18 +65,6 @@ pub fn open(app: &mut VectorcraftApp, params: &Value) {
 }
 
 fn body(app: &mut VectorcraftApp, ui: &mut egui::Ui, d: &mut Dialog) -> bool {
-    if widgets::flat_button(ui, tl!("3ds Max — R12 Linework"), 210.0).clicked() {
-        d.fields.insert("version".into(), json!(DxfVersion::R12.id()));
-        d.fields.insert("unit".into(), json!(Unit::Millimeters.label()));
-        d.fields.insert("scale".into(), json!(1));
-        d.fields.insert("preserve".into(), json!(Preserve::Editability.id()));
-        d.fields.insert("centerlineStrokes".into(), json!(true));
-        d.fields.insert("colors".into(), json!(ColorDepth::Aci256.id()));
-        d.fields.insert("outlineText".into(), json!(true));
-        d.fields.insert("alterPaths".into(), json!(false));
-        d.fields.insert("scaleLineweights".into(), json!(false));
-    }
-    ui.add_space(6.0);
     let versions: Vec<(&str, &str)> = DxfVersion::ALL.iter().map(|v| (v.id(), v.label())).collect();
     choice(ui, d, "version", tl!("Version:"), &versions);
     ui.add_space(4.0);
@@ -112,7 +99,6 @@ fn body(app: &mut VectorcraftApp, ui: &mut egui::Ui, d: &mut Dialog) -> bool {
         d.fields.insert("selectedOnly".into(), json!(!d.bool("selectedOnly")));
     }
     check(ui, d, "alterPaths", tl!("Alter Paths for Appearance"));
-    check(ui, d, "centerlineStrokes", tl!("Export Strokes as Centerlines (0 width)"));
     // Preserve Appearance always outlines type.
     let appearance = preserve == Preserve::Appearance;
     if widgets::check(ui, tl!("Outline Text"), appearance || d.bool("outlineText"), !appearance) {
@@ -121,13 +107,9 @@ fn body(app: &mut VectorcraftApp, ui: &mut egui::Ui, d: &mut Dialog) -> bool {
     ui.add_space(8.0);
     super::form::caption(
         ui,
-        if d.bool("centerlineStrokes") {
-            tl!("Stroked paths become one zero-width centerline; their fills are omitted.")
-        } else {
-            match preserve {
-                Preserve::Appearance => tl!("Type becomes outlines, and strokes a CAD line can't draw become filled shapes."),
-                Preserve::Editability => tl!("Type stays text, and every stroke is a line with its lineweight and dashes."),
-            }
+        match preserve {
+            Preserve::Appearance => tl!("Type becomes outlines, and strokes a CAD line can't draw become filled shapes."),
+            Preserve::Editability => tl!("Type stays text, and every stroke is a line with its lineweight and dashes."),
         },
     );
     false

crates/ui-egui/src/i18n/cs.tsv

@@ -1906,9 +1906,6 @@ lighting	Light	Světlo
 	Scale to Fit Artboard	Přizpůsobit pracovní ploše
 	Scaling	Měřítko
 	Alter Paths for Appearance	Upravit cesty podle vzhledu
-	3ds Max — R12 Linework	Čárový výkres R12 pro 3ds Max
-	Export Strokes as Centerlines (0 width)	Exportovat tahy jako osy (tloušťka 0)
-	Stroked paths become one zero-width centerline; their fills are omitted.	Cesty s tahem se změní na jednu osu nulové tloušťky; jejich výplně se vynechají.
 	DXF Options	Možnosti DXF
 	Export Option	Možnost exportu
 	Export Selected Art Only	Exportovat jen vybranou kresbu

crates/ui-egui/src/i18n/de.tsv

@@ -147,9 +147,6 @@
 	Alt	Alt
 	Alt:	Alt-Text:
 	Alter Paths for Appearance	Pfade für das Aussehen anpassen
-	3ds Max — R12 Linework	3ds Max — R12-Linien
-	Export Strokes as Centerlines (0 width)	Konturen als Mittellinien exportieren (Breite 0)
-	Stroked paths become one zero-width centerline; their fills are omitted.	Pfade mit Kontur werden zu einer Mittellinie der Breite 0; ihre Flächen entfallen.
 	Amount	Stärke
 	Amount:	Stärke:
 	Anchor Point	Ankerpunkt

crates/ui-egui/src/i18n/es.tsv

@@ -165,9 +165,6 @@
 	Alt	Alt
 	Alt:	Alt:
 	Alter Paths for Appearance	Modificar trazados según la apariencia
-	3ds Max — R12 Linework	Trazado lineal R12 para 3ds Max
-	Export Strokes as Centerlines (0 width)	Exportar trazos como líneas centrales (grosor 0)
-	Stroked paths become one zero-width centerline; their fills are omitted.	Los trazados con trazo se convierten en una línea central de grosor cero; se omiten sus rellenos.
 	Amount	Cantidad
 	Amount:	Cantidad:
 	Anchor Point	Punto de ancla

crates/ui-egui/src/i18n/fr.tsv

@@ -166,9 +166,6 @@
 	Alt	Alt
 	Alt:	Alt :
 	Alter Paths for Appearance	Modifier les tracés selon l’aspect
-	3ds Max — R12 Linework	3ds Max — Tracé linéaire R12
-	Export Strokes as Centerlines (0 width)	Exporter les contours en lignes médianes (épaisseur 0)
-	Stroked paths become one zero-width centerline; their fills are omitted.	Les tracés avec contour deviennent une ligne médiane d’épaisseur nulle ; leurs fonds sont omis.
 	Amount	Quantité
 	Amount:	Quantité :
 	Anchor Point	Point d’ancrage

crates/ui-egui/src/i18n/hu.tsv

@@ -252,10 +252,6 @@
 	Alt+Drag	Alt+húzás
 	Alt:	Helyettesítő szöveg:
 	Alter Paths for Appearance	Útvonalak módosítása a megjelenés szerint
-	3ds Max — R12 Linework	3ds Max — R12 vonalrajz
-	Export Strokes as Centerlines (0 width)	Körvonalak exportálása középvonalként (0 vastagság)
-	Stroked paths become one zero-width centerline; their fills are omitted.	A körvonalas útvonalakból egyetlen 0 vastagságú középvonal lesz; a kitöltésük elmarad.
-	Ambient	Környezeti fény
 	Amount	Mérték
 	Amount:	Mérték:
 	Analogous	Analóg

crates/ui-egui/src/i18n/it.tsv

@@ -165,9 +165,6 @@
 	Alt	Alt
 	Alt:	Alt:
 	Alter Paths for Appearance	Modifica tracciati in base all'aspetto
-	3ds Max — R12 Linework	3ds Max — Linee R12
-	Export Strokes as Centerlines (0 width)	Esporta tracce come linee d’asse (spessore 0)
-	Stroked paths become one zero-width centerline; their fills are omitted.	I tracciati con traccia diventano un’unica linea d’asse a spessore zero; i riempimenti vengono omessi.
 	Amount	Quantità
 	Amount:	Quantità:
 	Anchor Point	Punto di ancoraggio

crates/ui-egui/src/i18n/ja.tsv

@@ -815,9 +815,6 @@
 	All the art	すべてのアート
 	Alt:	代替テキスト:
 	Alter Paths for Appearance	外観を保つためにパスを変更
-	3ds Max — R12 Linework	3ds Max — R12 線画
-	Export Strokes as Centerlines (0 width)	線を中心線として書き出し (幅 0)
-	Stroked paths become one zero-width centerline; their fills are omitted.	線のあるパスは幅 0 の中心線 1 本になり、塗りは省略されます。
 	Amount:	量:
 	Anchor Point	アンカーポイント
 	Anchor Point Tool	アンカーポイントツール

crates/ui-egui/src/i18n/ko.tsv

@@ -810,9 +810,6 @@
 	All the art	모든 아트워크
 	Alt:	Alt:
 	Alter Paths for Appearance	모양에 맞게 패스 변경
-	3ds Max — R12 Linework	3ds Max — R12 선 작업
-	Export Strokes as Centerlines (0 width)	선을 중심선으로 내보내기(두께 0)
-	Stroked paths become one zero-width centerline; their fills are omitted.	선이 있는 패스는 두께 0인 중심선 하나가 되며 칠은 생략됩니다.
 	Amount:	양:
 	Anchor Point	앵커 포인트
 	Anchor Point Tool	앵커 포인트 도구

crates/ui-egui/src/i18n/pl.tsv

@@ -1851,9 +1851,6 @@ lighting	Light	Światło
 	Scale to Fit Artboard	Skaluj, aby dopasować do obszaru kompozycji
 	Scaling	Skalowanie
 	Alter Paths for Appearance	Zmień ścieżki dla zachowania wyglądu
-	3ds Max — R12 Linework	3ds Max — linie R12
-	Export Strokes as Centerlines (0 width)	Eksportuj obrysy jako linie środkowe (szerokość 0)
-	Stroked paths become one zero-width centerline; their fills are omitted.	Ścieżki z obrysem stają się jedną linią środkową o zerowej szerokości; ich wypełnienia są pomijane.
 	DXF Options	Opcje DXF
 	Export Option	Opcja eksportu
 	Export Selected Art Only	Eksportuj tylko zaznaczoną kompozycję

crates/ui-egui/src/i18n/pt-br.tsv

@@ -175,7 +175,6 @@
 	All the art	Toda a arte
 	Alt:	Alt:
 	Alter Paths for Appearance	Alterar Caminhos para Aparência
-	3ds Max — R12 Linework	Traçado em linhas R12 para 3ds Max
 	Amount:	Quantidade:
 	Anchor Point	Ponto de Ancoragem
 	Anchor Point Tool	Ferramenta Ponto de Ancoragem

crates/ui-egui/src/i18n/ru.tsv

@@ -163,9 +163,6 @@
 	Alt	Alt
 	Alt:	Alt:
 	Alter Paths for Appearance	Изменять контуры для оформления
-	3ds Max — R12 Linework	3ds Max — линии R12
-	Export Strokes as Centerlines (0 width)	Экспортировать обводки как осевые линии (толщина 0)
-	Stroked paths become one zero-width centerline; their fills are omitted.	Контуры с обводкой становятся одной осевой линией нулевой толщины; заливки опускаются.
 	Amount	Количество
 	Amount:	Количество:
 	Anchor Point	Опорная точка

crates/ui-egui/src/i18n/uk.tsv

@@ -159,9 +159,6 @@
 	Alt	Alt
 	Alt:	Alt:
 	Alter Paths for Appearance	Змінювати контури для оформлення
-	3ds Max — R12 Linework	3ds Max — лінії R12
-	Export Strokes as Centerlines (0 width)	Експортувати обведення як осьові лінії (товщина 0)
-	Stroked paths become one zero-width centerline; their fills are omitted.	Контури з обведенням стають однією осьовою лінією нульової товщини; заливки пропускаються.
 	Amount	Кількість
 	Amount:	Кількість:
 	Anchor Point	Опорна точка

crates/ui-egui/src/i18n/vi.tsv

@@ -191,10 +191,6 @@
 	Alt	Alt
 	Alt:	Alt:
 	Alter Paths for Appearance	Sửa đường dẫn cho diện mạo
-	3ds Max — R12 Linework	3ds Max — đường nét R12
-	Export Strokes as Centerlines (0 width)	Xuất nét thành đường tâm (độ rộng 0)
-	Stroked paths become one zero-width centerline; their fills are omitted.	Các đường có nét trở thành một đường tâm có độ rộng 0; phần tô của chúng bị bỏ qua.
-	Ambient	Ánh sáng môi trường
 	Amount	Mức độ
 	Amount:	Mức độ:
 	Anchor Point	Điểm neo

crates/ui-egui/src/i18n/zh-hans.tsv

@@ -125,9 +125,6 @@
 	Alt	Alt
 	Alt:	Alt：
 	Alter Paths for Appearance	为外观改变路径
-	3ds Max — R12 Linework	3ds Max — R12 线稿
-	Export Strokes as Centerlines (0 width)	将描边导出为中心线（宽度 0）
-	Stroked paths become one zero-width centerline; their fills are omitted.	带描边的路径变为一条宽度为零的中心线；其填色将被省略。
 	Amount	数量
 	Amount:	数量：
 	Anchor Point	锚点

crates/ui-egui/src/i18n/zh-hant.tsv

@@ -134,9 +134,6 @@
 	Alt	Alt
 	Alt:	Alt：
 	Alter Paths for Appearance	依外觀調整路徑
-	3ds Max — R12 Linework	3ds Max — R12 線稿
-	Export Strokes as Centerlines (0 width)	將筆畫轉存為中心線 (寬度 0)
-	Stroked paths become one zero-width centerline; their fills are omitted.	具有筆畫的路徑會變成一條寬度為零的中心線；其填色不會保留。
 	Amount	數量
 	Amount:	數量：
 	Anchor Point	錨點

docs/mcp.md

@@ -2277,14 +2277,6 @@ selected objects in their layers (every export takes it), and `useArtboards: tru
 artboard holding the art over it. What DXF can't hold (gradients and patterns as one colour, blending, opacity masks,
 raster effects, clipping) comes back in `warnings`.
 
-`centerlineStrokes: true` writes each stroked path once, as a zero-width centerline (its fill and stroke outline
-are left out): the linework 3D and CAM software extrude or sweep along, instead of the outline of the stroke's
-width. For linework intended for 3ds Max, Export As → DXF has a **3ds Max — R12 Linework** preset: millimetres, R12
-polylines (curves are flattened), editable strokes as centerlines, 256 colours and outlined text, the version older
-CAD importers read most reliably. Review the export warnings: R12 drops images and fill interiors. Through
-`document.exportDxf` the preset is `version: "R12"`, `unit: "mm"`, `preserve: "editability"`,
-`centerlineStrokes: true`, `colors: 256` and `outlineText: true`.
-
 DWG can't be written (no openly licensed writer exists): `document.formats` lists it under `unsupported` with that
 hint, and exporting to it answers with the hint to export DXF. PICT files are not supported either and say so when
 opened.