feat: add stroke stabilizer

Author: devmobasa

README.md

@@ -208,6 +208,7 @@ For distro-specific package details, see [Installation](#installation). For keyb
 - Selection: Alt-drag, <kbd>V</kbd> tool, properties panel
 - Duplicate (<kbd>Ctrl+D</kbd>), delete (<kbd>Delete</kbd>), undo/redo
 - Color picker, palettes, size via hotkeys or scroll
+- Opt-in stroke stabilizer for completed pen/marker paths
 - Render color profiles for print/projector/light-theme preview
 - Radial menu at cursor (<kbd>Middle-click</kbd>): quick tool/color selection + scroll size adjust
 

config.example.toml

@@ -813,6 +813,10 @@ default_eraser_mode = "brush"
 # Default marker opacity multiplier (0.05 - 0.90). Multiplies the current color alpha.
 marker_opacity = 0.32
 
+# Stroke stabilizer strength for completed pen/marker paths (0.0 - 1.0).
+# 0.0 disables smoothing; live previews remain raw and the finalized stroke is smoothed on release.
+stroke_stabilizer_strength = 0.0
+
 # Default fill state for fill-capable shapes
 default_fill_enabled = false
 

configurator/src/app/search/terms.rs

@@ -88,6 +88,9 @@ pub(super) const DRAWING_DEFAULT_TERMS: &[&str] = &[
     "shape",
     "marker",
     "marker opacity",
+    "stroke stabilizer",
+    "stabilizer",
+    "smoothing",
     "fill",
     "start shapes filled",
     "enable text background",

configurator/src/app/search/tests.rs

@@ -106,7 +106,13 @@ fn field_level_terms_do_not_force_whole_tab_visible() {
 
 #[test]
 fn exact_drawing_default_labels_match_defaults_section() {
-    for query in ["font size pt", "eraser size px", "enable text background"] {
+    for query in [
+        "font size pt",
+        "eraser size px",
+        "enable text background",
+        "stroke stabilizer",
+        "smoothing",
+    ] {
         let (mut app, _task) = ConfiguratorApp::new_app();
         app.search_query = SearchQuery::new(query);
 

configurator/src/app/view/drawing/mod.rs

@@ -106,6 +106,18 @@ impl ConfiguratorApp {
                             None,
                             validate_f64_range(&self.draft.drawing_marker_opacity, 0.05, 0.9),
                         ),
+                        labeled_input_with_feedback(
+                            "Stroke stabilizer",
+                            &self.draft.drawing_stroke_stabilizer_strength,
+                            &self.defaults.drawing_stroke_stabilizer_strength,
+                            TextField::DrawingStrokeStabilizerStrength,
+                            Some("Range: 0-1"),
+                            validate_f64_range(
+                                &self.draft.drawing_stroke_stabilizer_strength,
+                                0.0,
+                                1.0,
+                            ),
+                        ),
                         labeled_input_with_feedback(
                             "Undo stack limit",
                             &self.draft.drawing_undo_stack_limit,

configurator/src/app/view/widgets/validation.rs

@@ -8,7 +8,9 @@ pub(in crate::app::view) fn validate_f64_range(value: &str, min: f64, max: f64)
 
     match trimmed.parse::<f64>() {
         Ok(value) => {
-            if value < min || value > max {
+            if !value.is_finite() {
+                Some("Expected a finite numeric value".to_string())
+            } else if value < min || value > max {
                 Some(format!(
                     "Range: {}-{}",
                     format_float(min),
@@ -132,6 +134,10 @@ mod tests {
             validate_f64_range("", 0.5, 2.0),
             Some("Expected a numeric value".to_string())
         );
+        assert_eq!(
+            validate_f64_range("nan", 0.5, 2.0),
+            Some("Expected a finite numeric value".to_string())
+        );
     }
 
     #[test]

configurator/src/models/config/draft/from_config.rs

@@ -34,6 +34,9 @@ impl ConfigDraft {
             drawing_default_font_size: format_float(config.drawing.default_font_size),
             drawing_polygon_sides: config.drawing.polygon_sides.to_string(),
             drawing_marker_opacity: format_float(config.drawing.marker_opacity),
+            drawing_stroke_stabilizer_strength: format_float(
+                config.drawing.stroke_stabilizer_strength,
+            ),
             drawing_hit_test_tolerance: format_float(config.drawing.hit_test_tolerance),
             drawing_hit_test_linear_threshold: config.drawing.hit_test_linear_threshold.to_string(),
             drawing_undo_stack_limit: config.drawing.undo_stack_limit.to_string(),

configurator/src/models/config/draft/mod.rs

@@ -25,6 +25,7 @@ pub struct ConfigDraft {
     pub drawing_default_font_size: String,
     pub drawing_polygon_sides: String,
     pub drawing_marker_opacity: String,
+    pub drawing_stroke_stabilizer_strength: String,
     pub drawing_hit_test_tolerance: String,
     pub drawing_hit_test_linear_threshold: String,
     pub drawing_undo_stack_limit: String,

configurator/src/models/config/setters.rs

@@ -258,6 +258,9 @@ impl ConfigDraft {
             TextField::DrawingFontSize => self.drawing_default_font_size = value,
             TextField::DrawingPolygonSides => self.drawing_polygon_sides = value,
             TextField::DrawingMarkerOpacity => self.drawing_marker_opacity = value,
+            TextField::DrawingStrokeStabilizerStrength => {
+                self.drawing_stroke_stabilizer_strength = value;
+            }
             TextField::DrawingFontFamily => self.drawing_font_family = value,
             TextField::DrawingFontWeight => {
                 self.drawing_font_weight = value;

configurator/src/models/config/tests.rs

@@ -364,6 +364,12 @@ fn setters_update_draft_state() {
     assert_eq!(draft.drawing_font_weight, "weird");
     assert_eq!(draft.drawing_font_weight_option, FontWeightOption::Custom);
 
+    draft.set_text(
+        TextField::DrawingStrokeStabilizerStrength,
+        "0.5".to_string(),
+    );
+    assert_eq!(draft.drawing_stroke_stabilizer_strength, "0.5");
+
     draft.set_text(TextField::DrawingColorName, "green".to_string());
     assert_eq!(draft.drawing_color.name, "green");
     assert_eq!(draft.drawing_color.selected_named, NamedColorOption::Green);