Sketch: infinite construction lines (#1359) (#1547)

Thanks @DuBearte.

assets/icons/ui/source/icons.rs

@@ -490,6 +490,23 @@ pub(crate) fn paint_with(p: &Painter, r: Rect, name: &str, ink: Color32, fill: C
             }
             p.circle_filled(at(0.5), dot_r, a);
         }
+        "infinite" => {
+            // An infinite line (#1359): Construction's broken line, with an open arrowhead at
+            // each end saying it runs on. Accent only, like Construction and Centerline.
+            let w = line_type_stroke(r);
+            let at = |t: f32| pen.at(3.0 + 16.0 * t, 19.0 - 16.0 * t);
+            for (t0, t1) in [(0.0, 0.38), (0.62, 1.0)] {
+                p.add(Shape::line(vec![at(t0), at(t1)], Stroke::new(w, a)));
+            }
+            // Each head: two short strokes back from the tip, either side of the line.
+            let tip_len = 0.3;
+            for (tip, back) in [(0.0f32, tip_len), (1.0, 1.0 - tip_len)] {
+                let (t, b) = (at(tip), at(back));
+                let along = b - t;
+                let side = egui::vec2(-along.y, along.x) * 0.55;
+                p.add(Shape::line(vec![b + side, t, b - side], Stroke::new(w, a)));
+            }
+        }
         "c_hv" => {
             pen.line(&[(4.0, 18.0), (20.0, 18.0)], a);
             pen.line(&[(6.0, 4.0), (6.0, 14.0)], a);
@@ -1482,7 +1499,7 @@ mod tests {
     /// theme's construction orange) and must not change with `ink`.
     #[test]
     fn construction_and_centerline_icons_follow_the_callers_accent_only() {
-        for name in ["construction", "centerline"] {
+        for name in ["construction", "centerline", "infinite"] {
             let base = drawn(name, Color32::BLACK, Color32::WHITE, Color32::from_rgb(1, 2, 3));
             let other_accent = drawn(name, Color32::BLACK, Color32::WHITE, Color32::from_rgb(4, 5, 6));
             assert_ne!(base, other_accent, "{name} icon must change with the caller's accent colour");

assets/locales/de.json

@@ -305,6 +305,7 @@
   "cmd.sketch_fit_curves_to_section": "Kurven an Netzquerschnitt anpassen",
   "cmd.sketch_glyphs": "Bedingungssymbole",
   "cmd.sketch_include_3d": "3D-Geometrie einbeziehen",
+  "cmd.sketch_infinite": "Unendliche Linie",
   "cmd.sketch_insert_dxf": "DXF einfügen",
   "cmd.sketch_insert_svg": "SVG einfügen",
   "cmd.sketch_inspect": "Skizze prüfen",
@@ -907,6 +908,7 @@
   "ui.home": "Start",
   "ui.homeView": "Startansicht",
   "ui.horizontal_vertical": "Horizontal/Vertikal",
+  "ui.infinite": "Unendlich",
   "ui.insert": "Einfügen",
   "ui.inspect": "Prüfen",
   "ui.intersect": "Schnitt",

assets/locales/en.json

@@ -507,6 +507,7 @@
   "cmd.sketch_fit_curves_to_section": "Fit Curves to Mesh Section",
   "cmd.sketch_glyphs": "Constraint Glyphs",
   "cmd.sketch_include_3d": "Include 3D Geometry",
+  "cmd.sketch_infinite": "Infinite Line",
   "cmd.sketch_insert_dxf": "Insert DXF",
   "cmd.sketch_insert_svg": "Insert SVG",
   "cmd.sketch_inspect": "Inspect Sketch",
@@ -1139,6 +1140,7 @@
   "ui.homeView": "Home View",
   "ui.horizontal_vertical": "Horizontal/Vertical",
   "ui.import_ellipsis": "Import…",
+  "ui.infinite": "Infinite",
   "ui.insert": "Insert",
   "ui.inspect": "Inspect",
   "ui.intersect": "Intersect",

assets/locales/fr.json

@@ -487,6 +487,7 @@
   "cmd.sketch_fit_curves_to_section": "Ajuster des courbes à la section du maillage",
   "cmd.sketch_glyphs": "Symboles de contraintes",
   "cmd.sketch_include_3d": "Inclure une géométrie 3D",
+  "cmd.sketch_infinite": "Ligne infinie",
   "cmd.sketch_insert_dxf": "Insérer un DXF",
   "cmd.sketch_insert_svg": "Insérer un SVG",
   "cmd.sketch_inspect": "Inspecter l'esquisse",
@@ -979,6 +980,7 @@
   "ui.homeView": "Vue d'accueil",
   "ui.horizontal_vertical": "Horizontale/Verticale",
   "ui.import_ellipsis": "Importer…",
+  "ui.infinite": "Infinie",
   "ui.insert": "Insérer",
   "ui.inspect": "Inspecter",
   "ui.intersect": "Intersection",

assets/locales/ja.json

@@ -507,6 +507,7 @@
   "cmd.sketch_fit_curves_to_section": "メッシュ断面に曲線をフィット",
   "cmd.sketch_glyphs": "拘束記号",
   "cmd.sketch_include_3d": "3D ジオメトリを含める",
+  "cmd.sketch_infinite": "無限線",
   "cmd.sketch_insert_dxf": "DXF を挿入",
   "cmd.sketch_insert_svg": "SVG を挿入",
   "cmd.sketch_inspect": "スケッチを検査",
@@ -1139,6 +1140,7 @@
   "ui.homeView": "ホームビュー",
   "ui.horizontal_vertical": "水平/垂直",
   "ui.import_ellipsis": "インポート…",
+  "ui.infinite": "無限",
   "ui.insert": "挿入",
   "ui.inspect": "検査",
   "ui.intersect": "交差",

assets/locales/ko.json

@@ -305,6 +305,7 @@
   "cmd.sketch_fit_curves_to_section": "메시 단면에 곡선 맞추기",
   "cmd.sketch_glyphs": "구속 기호",
   "cmd.sketch_include_3d": "3D 기하 포함",
+  "cmd.sketch_infinite": "무한선",
   "cmd.sketch_insert_dxf": "DXF 삽입",
   "cmd.sketch_insert_svg": "SVG 삽입",
   "cmd.sketch_inspect": "스케치 검사",
@@ -907,6 +908,7 @@
   "ui.home": "홈",
   "ui.homeView": "홈 보기",
   "ui.horizontal_vertical": "수평/수직",
+  "ui.infinite": "무한",
   "ui.insert": "삽입",
   "ui.inspect": "검사",
   "ui.intersect": "교차",

assets/locales/ru.json

@@ -458,6 +458,7 @@
   "cmd.sketch_fit_curves_to_section": "Подобрать кривые по сечению меша",
   "cmd.sketch_glyphs": "Знаки ограничений",
   "cmd.sketch_include_3d": "Включить 3D-геометрию",
+  "cmd.sketch_infinite": "Бесконечная линия",
   "cmd.sketch_insert_dxf": "Вставить DXF",
   "cmd.sketch_insert_svg": "Вставить SVG",
   "cmd.sketch_inspect": "Инспекция эскиза",
@@ -931,6 +932,7 @@
   "ui.homeView": "Главный вид",
   "ui.horizontal_vertical": "Горизонталь/Вертикаль",
   "ui.import_ellipsis": "Импорт…",
+  "ui.infinite": "Бесконечная",
   "ui.insert": "Вставить",
   "ui.inspect": "Инспекция",
   "ui.intersect": "Пересечение",

assets/locales/uk.json

@@ -455,6 +455,7 @@
   "cmd.sketch_fit_curves_to_section": "Підігнати криві до перерізу сітки",
   "cmd.sketch_glyphs": "Позначки обмежень",
   "cmd.sketch_include_3d": "Включити 3D-геометрію",
+  "cmd.sketch_infinite": "Нескінченна лінія",
   "cmd.sketch_insert_dxf": "Вставити DXF",
   "cmd.sketch_insert_svg": "Вставити SVG",
   "cmd.sketch_inspect": "Перевірити ескіз",
@@ -830,6 +831,7 @@
   "ui.homeView": "Головний вид",
   "ui.horizontal_vertical": "Горизонталь/вертикаль",
   "ui.import_ellipsis": "Імпорт…",
+  "ui.infinite": "Нескінченна",
   "ui.insert": "Вставити",
   "ui.inspect": "Перевірити",
   "ui.intersect": "Перетин",

assets/locales/zh.json

@@ -507,6 +507,7 @@
   "cmd.sketch_fit_curves_to_section": "将曲线拟合到网格截面",
   "cmd.sketch_glyphs": "约束符号",
   "cmd.sketch_include_3d": "包含三维几何",
+  "cmd.sketch_infinite": "无限长直线",
   "cmd.sketch_insert_dxf": "插入 DXF",
   "cmd.sketch_insert_svg": "插入 SVG",
   "cmd.sketch_inspect": "检查草图",
@@ -1139,6 +1140,7 @@
   "ui.homeView": "主视图",
   "ui.horizontal_vertical": "水平/垂直",
   "ui.import_ellipsis": "导入…",
+  "ui.infinite": "无限",
   "ui.insert": "插入",
   "ui.inspect": "检查",
   "ui.intersect": "相交",