fix(plot): match PDF output to viewport

Refs #618

src/app/update/file.rs

@@ -2632,6 +2632,7 @@ pub(super) fn on_open_file(&mut self) -> Task<Message> {
     /// layout's plot settings and the printers found on the system.
     pub(super) fn on_plot_dialog_open(&mut self) -> Task<Message> {
         use crate::io::paper_sizes::Orientation;
+        let previous = self.plot_dialog.clone();
         let scales: Vec<(String, f64)> = self.tabs[self.active_tab]
             .scene
             .scale_list()
@@ -2654,7 +2655,7 @@ pub(super) fn on_open_file(&mut self) -> Task<Message> {
             d.scale_lw = false;
             d.scale = one_to_one.clone();
         } else if !d.scales.iter().any(|(name, _)| name == &d.scale) {
-            d.scale = one_to_one;
+            d.scale = one_to_one.clone();
         }
         d.paper_space = self.tabs[self.active_tab].scene.current_layout != "Model";
         d.paper = self.plot_format.label().to_string();
@@ -2704,28 +2705,39 @@ pub(super) fn on_open_file(&mut self) -> Task<Message> {
         if self.plot_dialog.fit_to_paper {
             self.plot_dialog.scale_lw = false;
         }
-        // Refresh the list (<none> / <previous> / layouts / named setups) and
+        // Refresh document/runtime lists, then restore the live choices from
-        // snapshot the just-loaded settings as the `<previous>` restore point.
+        // the preceding dialog session. Previously the snapshot happened
+        // after the layout values above were reloaded, so opening Plot itself
+        // destroyed the user's last paper, area, scale and output choices.
         self.refresh_page_setups();
-        self.plot_prev = Some(self.plot_dialog.clone());
+        self.plot_prev = Some(previous);
-        // Model space keeps the last-used setup; a paper layout starts from its
+        self.select_page_setup(crate::ui::window::plot::SETUP_PREV);
-        // embedded setup.
+        // `<previous>` may come from another tab/drawing whose custom scale is
+        // not present in this document. Validate again after restoring it; the
+        // pre-restore validation above only saw the temporarily reseeded state.
+        if self.plot_dialog.scale.eq_ignore_ascii_case("fit") {
+            self.plot_dialog.fit_to_paper = true;
+            self.plot_dialog.scale = one_to_one.clone();
+        } else if !self
+            .plot_dialog
+            .scales
+            .iter()
+            .any(|(name, _)| name == &self.plot_dialog.scale)
+        {
+            self.plot_dialog.scale = one_to_one;
+        }
+        if self.plot_dialog.fit_to_paper {
+            self.plot_dialog.scale_lw = false;
+        }
+        // A model-space plot cannot use the paper-only Layout area. Other
+        // values remain exactly as the user left them; selecting a layout or
+        // named setup explicitly still reloads that setup below.
         let cur = self.tabs[self.active_tab].scene.current_layout.clone();
         if cur == "Model" {
-            self.select_page_setup(crate::ui::window::plot::SETUP_PREV);
             if self.plot_dialog.area == "Layout" {
                 self.plot_dialog.area = "Window".into();
                 self.normalize_common_plot_dialog();
             }
-        } else {
-            self.select_page_setup(&format!("*{cur}*"));
-            if self.plot_dialog.area != "Layout" {
-                // A layout may persist Window/Extents/Display together with its
-                // sheet-only origin/rotation. Start common area modes with the
-                // same neutral transform as Model even when no Area-change event
-                // fires after opening the dialog.
-                self.normalize_common_plot_dialog();
-            }
         }
         self.active_modal = Some(crate::app::ModalKind::Plot);
         Task::none()

src/io/pdf_export.rs

@@ -54,13 +54,15 @@ pub async fn pick_pdf_path_owned(_stem: String) -> Option<std::path::PathBuf> {
 /// mm to PDF points (1 mm = 2.834645 pt).
 #[cfg(not(target_arch = "wasm32"))]
 const MM_TO_PT: f32 = 2.834645;
-/// `wire.line_weight_px` is the on-screen pixel weight: mm × (96/25.4) × 2.0,
+/// `wire.line_weight_px` is the on-screen pixel weight. Convert the 96-dpi
-/// where the ×2 is a screen-legibility boost (see render.rs). Print wants the
+/// pixels to points while retaining the viewport's lineweight visibility
-/// true physical weight, so undo both the 96-dpi scaling and the boost before
+/// boost, so "As displayed" output has the same visual hierarchy as the
-/// converting to points — otherwise weights export ~2× too heavy in pixels
+/// canvas instead of making 0.35 mm ByLayer outlines look half as thick.
-/// (and the old `× 0.35278` left them inconsistent with the physical mm).
 #[cfg(not(target_arch = "wasm32"))]
-const LW_PX_TO_PT: f32 = MM_TO_PT / ((96.0 / 25.4) * 2.0);
+const LW_PX_TO_PT: f32 = MM_TO_PT / (96.0 / 25.4);
+
+#[cfg(not(target_arch = "wasm32"))]
+const SCREEN_DOT_MM: f32 = 25.4 / 96.0;
 
 /// Output controls shared by preview, PDF export, and printer rendering.
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
@@ -365,14 +367,16 @@ fn build_pdf(
             .map(|c| (c[0] - r).abs() > 0.01 || (c[1] - g).abs() > 0.01 || (c[2] - b).abs() > 0.01)
             .unwrap_or(true)
         {
-            ops.push(Op::SetOutlineColor {
+            let color = Color::Rgb(Rgb {
-                col: Color::Rgb(Rgb {
+                r,
-                    r,
+                g,
-                    g,
+                b,
-                    b,
+                icc_profile: None,
-                    icc_profile: None,
-                }),
             });
+            ops.push(Op::SetOutlineColor {
+                col: color.clone(),
+            });
+            ops.push(Op::SetFillColor { col: color });
             last_color = Some([r, g, b]);
         }
 
@@ -431,9 +435,11 @@ fn build_pdf(
         // low-coordinate drawings came out clean. The result is a sheet-mm value
         // in single digits, so f32 is lossless from here.
         let mut segment: Vec<LinePoint> = Vec::new();
+        let dot_radius = (wire.name == "viewport_hatch_pattern")
+            .then_some(Pt(SCREEN_DOT_MM * MM_TO_PT / (2.0 * scale.max(1e-6))));
         for (pi, &[x, y, _z]) in wire.points.iter().enumerate() {
             if x.is_nan() || y.is_nan() {
-                flush_line(&mut ops, &segment);
+                flush_line(&mut ops, &segment, dot_radius);
                 segment.clear();
             } else {
                 let lo = wire.points_low.get(pi).copied().unwrap_or([0.0; 3]);
@@ -445,7 +451,7 @@ fn build_pdf(
                 });
             }
         }
-        flush_line(&mut ops, &segment);
+        flush_line(&mut ops, &segment, dot_radius);
     }
 
     // Text (SDF glyph quads) — re-emitted as vector strokes / fills. Text now
@@ -499,10 +505,21 @@ fn dash_array_from_pattern(pattern_length: f32, pattern: &[f32; 8], mm_to_pt: f3
 }
 
 #[cfg(not(target_arch = "wasm32"))]
-fn flush_line(ops: &mut Vec<Op>, pts: &[LinePoint]) {
+fn flush_line(ops: &mut Vec<Op>, pts: &[LinePoint], dot_radius: Option<Pt>) {
     if pts.len() < 2 {
         return;
     }
+    if let Some(radius) = dot_radius {
+        let first = pts[0].p;
+        let coincident = pts.iter().skip(1).all(|point| {
+            (point.p.x.0 - first.x.0).abs() <= 1e-6
+                && (point.p.y.0 - first.y.0).abs() <= 1e-6
+        });
+        if coincident {
+            emit_round_dot(ops, first, radius);
+            return;
+        }
+    }
     ops.push(Op::DrawLine {
         line: Line {
             points: pts.to_vec(),
@@ -511,6 +528,30 @@ fn flush_line(ops: &mut Vec<Op>, pts: &[LinePoint]) {
     });
 }
 
+#[cfg(not(target_arch = "wasm32"))]
+fn emit_round_dot(ops: &mut Vec<Op>, center: Point, radius: Pt) {
+    const SIDES: usize = 12;
+    let points = (0..SIDES)
+        .map(|index| {
+            let angle = std::f32::consts::TAU * index as f32 / SIDES as f32;
+            LinePoint {
+                p: Point {
+                    x: Pt(center.x.0 + radius.0 * angle.cos()),
+                    y: Pt(center.y.0 + radius.0 * angle.sin()),
+                },
+                bezier: false,
+            }
+        })
+        .collect();
+    ops.push(Op::DrawPolygon {
+        polygon: Polygon {
+            rings: vec![PolygonRing { points }],
+            mode: PaintMode::Fill,
+            winding_order: WindingOrder::NonZero,
+        },
+    });
+}
+
 #[cfg(not(target_arch = "wasm32"))]
 fn plotted_color(
     rgb: [f32; 3],
@@ -685,7 +726,9 @@ fn emit_hatch(
         r = 1.0;
         g = 1.0;
         b = 1.0;
-    } else if !color_overridden {
+    } else if !color_overridden
+        && !(hatch.aci == 7 && matches!(hatch.pattern, HatchPattern::Solid))
+    {
         let is_light = r > 0.80 && g > 0.80 && b > 0.80;
         let is_yellow = r > 0.80 && g > 0.70 && b < 0.30;
         let is_cyan = r < 0.30 && g > 0.70 && b > 0.70;
@@ -778,21 +821,20 @@ fn emit_hatch(
         } else {
             scale.max(1e-6)
         };
-        let screen_dot_mm = 25.4 / 96.0;
+        let segments = hatch.pattern_segments_for_plot();
-        let dot_length = (physical / MM_TO_PT / divisor)
-            .max(screen_dot_mm / scale.max(1e-6));
-        let segments = hatch.pattern_segments_for_plot(dot_length as f64);
         if segments.is_empty() {
             return;
         }
-        ops.push(Op::SetOutlineColor {
+        let color = Color::Rgb(Rgb {
-            col: Color::Rgb(Rgb {
+            r,
-                r,
+            g,
-                g,
+            b,
-                b,
+            icc_profile: None,
-                icc_profile: None,
-            }),
         });
+        ops.push(Op::SetOutlineColor {
+            col: color.clone(),
+        });
+        ops.push(Op::SetFillColor { col: color });
         ops.push(Op::SetOutlineThickness {
             pt: Pt(physical / divisor),
         });
@@ -806,21 +848,18 @@ fn emit_hatch(
             // before narrowing, as everywhere else in this file.
             let (ax, ay) = ((a[0] + ox) as f32, (a[1] + oy) as f32);
             let (bx, by) = ((b_pt[0] + ox) as f32, (b_pt[1] + oy) as f32);
-            ops.push(Op::DrawLine {
+            let points = vec![
-                line: Line {
+                LinePoint {
-                    points: vec![
+                    p: Point::new(Mm(ax), Mm(ay)),
-                        LinePoint {
+                    bezier: false,
-                            p: Point::new(Mm(ax), Mm(ay)),
-                            bezier: false,
-                        },
-                        LinePoint {
-                            p: Point::new(Mm(bx), Mm(by)),
-                            bezier: false,
-                        },
-                    ],
-                    is_closed: false,
                 },
-            });
+                LinePoint {
+                    p: Point::new(Mm(bx), Mm(by)),
+                    bezier: false,
+                },
+            ];
+            let dot_radius = Pt(SCREEN_DOT_MM * MM_TO_PT / (2.0 * scale.max(1e-6)));
+            flush_line(ops, &points, Some(dot_radius));
         }
         return;
     }

src/scene/entity.rs

@@ -1343,8 +1343,20 @@ impl Scene {
                             style.4
                         };
                         let color = style.0;
-                        let color =
+                        // Explicit ACI 7 solid fills inside blocks are often
-                            crate::scene::view::render::adapt_to_bg(color, hatch_bg);
+                        // white masks. Keep the explicit white on a light
+                        // layout; adapting it to paper turns the mask into a
+                        // black rectangle unlike the viewport (#618).
+                        let preserve_white_mask = dxf.is_solid
+                            && matches!(
+                                dxf.common.color,
+                                acadrust::types::Color::Index(7)
+                            );
+                        let color = if preserve_white_mask {
+                            color
+                        } else {
+                            crate::scene::view::render::adapt_to_bg(color, hatch_bg)
+                        };
                         if let Some(mut model) =
                             Self::hatch_model_from_dxf(&dxf, color)
                         {

src/scene/model/hatch_model.rs

@@ -210,16 +210,12 @@ impl HatchModel {
         self.pattern_segments_with_dot_length(None)
     }
 
-    /// Plot variant of [`Self::pattern_segments`] that renders PAT zero-length
+    /// Plot variant of [`Self::pattern_segments`] that preserves PAT
-    /// dash entries at a caller-provided world length. Screen rendering snaps
+    /// zero-length dash entries as coincident endpoints. The PDF exporter can
-    /// these entries to one pixel; plot callers know the model-to-paper scale
+    /// then paint a round point; turning them into short segments here makes
-    /// and can therefore choose the equivalent physical mark without tying its
+    /// point-only patterns such as AR-CONC visibly look like tiny lines.
-    /// size to the pattern period.
+    pub(crate) fn pattern_segments_for_plot(&self) -> Vec<[[f64; 2]; 2]> {
-    pub(crate) fn pattern_segments_for_plot(
+        self.pattern_segments_with_dot_length(Some(0.0))
-        &self,
-        dot_length: f64,
-    ) -> Vec<[[f64; 2]; 2]> {
-        self.pattern_segments_with_dot_length(Some(dot_length.max(1e-9)))
     }
 
     fn pattern_segments_with_dot_length(
@@ -436,13 +432,18 @@ impl HatchModel {
                                     ]);
                                 }
                             } else if d == 0.0 && seg_t >= t0 - 1e-6 && seg_t <= t1 + 1e-6 {
-                                let a = (seg_t - dot_len * 0.5).max(t0);
+                                if plot_dot_length == Some(0.0) {
-                                let b = (seg_t + dot_len * 0.5).min(t1);
+                                    let point = [lx + seg_t * cos_a, ly + seg_t * sin_a];
-                                if b > a {
+                                    segments.push([point, point]);
-                                    segments.push([
+                                } else {
-                                        [lx + a * cos_a, ly + a * sin_a],
+                                    let a = (seg_t - dot_len * 0.5).max(t0);
-                                        [lx + b * cos_a, ly + b * sin_a],
+                                    let b = (seg_t + dot_len * 0.5).min(t1);
-                                    ]);
+                                    if b > a {
+                                        segments.push([
+                                            [lx + a * cos_a, ly + a * sin_a],
+                                            [lx + b * cos_a, ly + b * sin_a],
+                                        ]);
+                                    }
                                 }
                             }
                             seg_t += dl;

src/scene/project.rs

@@ -433,13 +433,6 @@ impl Scene {
             let hatches = self.plot_hatches_for_block(model_block, Some(&frozen));
             for hatch in hatches {
                 if matches!(&hatch.pattern, HatchPattern::Pattern(_)) {
-                    // The GPU draws PAT zero-length dash entries as one-pixel
-                    // dots. Convert that display pixel to model units before
-                    // projecting so vector output keeps the same dot size
-                    // instead of expanding it from the pattern period.
-                    let dot_length = (25.4 / 96.0)
-                        * self.paper_space_unit_factor()
-                        / viewport_scale.max(1e-9);
                     let mut points = Vec::new();
                     let mut aabb = [
                         f32::INFINITY,
@@ -447,7 +440,7 @@ impl Scene {
                         f32::NEG_INFINITY,
                         f32::NEG_INFINITY,
                     ];
-                    for [a, b] in hatch.pattern_segments_for_plot(dot_length) {
+                    for [a, b] in hatch.pattern_segments_for_plot() {
                         let (Some(a), Some(b)) =
                             (project(a[0], a[1]), project(b[0], b[1]))
                         else {

src/ui/window/plot.rs

@@ -99,18 +99,13 @@ pub struct PlotDialogState {
     pub printer: Option<String>,
     /// Output goes to a PDF file instead of a printer.
     pub to_file: bool,
-    #[serde(skip)]
     pub paper: String,
-    #[serde(skip)]
     pub orientation: String,
     pub upside_down: bool,
     pub copies: String,
     pub area: String,
-    #[serde(skip)]
     pub center: bool,
-    #[serde(skip)]
     pub offset_x: String,
-    #[serde(skip)]
     pub offset_y: String,
     pub scale: String,
     #[serde(default = "legacy_fit_to_paper_default")]