Options: snap marker size (#1770)

The object-snap glyphs were fixed at 5 px; a Drafting slider now scales
them from 1 to 20 px.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

src/app/config.rs

@@ -369,6 +369,8 @@ pub struct ModelSpaceThemeConfig {
     pub grip_hot: u8,
     /// GRIPHOVER: hovered/warm grip ACI color (0 = Theme Primary Strong, 1..=255 = ACI).
     pub grip_hover: u8,
+    /// SNAPMARKERSIZE: object-snap marker half-size in pixels (1–20, default 5).
+    pub snap_marker_size: u8,
 }
 
 impl Default for ModelSpaceThemeConfig {
@@ -390,6 +392,7 @@ impl Default for ModelSpaceThemeConfig {
             grip_color: 0,
             grip_hot: 0,
             grip_hover: 0,
+            snap_marker_size: 5,
         }
     }
 }

src/app/mod.rs

@@ -2609,6 +2609,8 @@ pub enum Message {
     SelectionHighlightColorChanged(u8),
     /// Change Grip size in pixels (1–25, GRIPSIZE).
     GripSizeChanged(u8),
+    /// Change the object-snap marker size in pixels (1–20, SNAPMARKERSIZE).
+    SnapMarkerSizeChanged(u8),
     /// Change Unselected Grip color ACI index (0 = Theme Primary, 1..=255 = ACI, GRIPCOLOR).
     GripColorChanged(u8),
     /// Change Selected/Hot Grip color ACI index (0 = Theme Danger, 1..=255 = ACI, GRIPHOT).

src/app/update/mod.rs

@@ -9052,6 +9052,12 @@ impl OpenCADStudio {
                 Task::none()
             }
 
+            Message::SnapMarkerSizeChanged(size) => {
+                self.model_space.snap_marker_size = size.clamp(1, 20);
+                self.persist_settings_if_changed();
+                Task::none()
+            }
+
             Message::GripColorChanged(color) => {
                 self.model_space.grip_color = color;
                 self.sync_model_space_theme(false);

src/app/view/mod.rs

@@ -958,6 +958,7 @@ bg={bg_ms:.1}ms n={view_count}"
                             || c.is_selection_gathering()
                     }),
                     snap_color: self.snap_marker_color,
+                    snap_size: self.model_space.snap_marker_size as f32,
                 },
                 // MATCHPROP paints properties onto destinations; it gets the
                 // paintbrush cursor instead of the crosshair.