Show active tracking reference tooltip

src/app/command_driver.rs

@@ -87,6 +87,7 @@ impl OpenCADStudio {
         self.snapper.from_point = None;
         self.snapper.clear_tracking();
         self.otrack_active = None;
+        self.otrack_kind = None;
         self.axis_lock_dir = None;
         self.dyn_user_reshaped = false;
         self.dyn_coord_absolute = false;

src/app/mod.rs

@@ -430,6 +430,9 @@ pub(super) struct OpenCADStudio {
     /// cursor is on a tracking ray. Lets a typed distance place a point along
     /// the ray from the tracking point (issue #69). `None` when not aligned.
     otrack_active: Option<(glam::DVec3, glam::DVec3)>,
+    /// Kind of the currently active tracking reference, kept separately from
+    /// `otrack_active` so typed-distance behavior remains unchanged.
+    otrack_kind: Option<crate::snap::TrackingKind>,
     /// Whether Tangent snap was enabled before a tangent-pick command started.
     pre_cmd_tangent: Option<bool>,
     /// Drawing defaults captured by ADDSELECTED before it adopts the template
@@ -3052,6 +3055,7 @@ impl OpenCADStudio {
             annotation_auto_scale: -4,
             last_saved_config: None,
             otrack_active: None,
+            otrack_kind: None,
             clean_screen: false,
             quick_properties: false,
             quick_properties_anchor: Point::new(12.0, 12.0),

src/app/update/mod.rs

@@ -255,6 +255,7 @@ impl OpenCADStudio {
         {
             self.snapper.clear_tracking();
             self.otrack_active = None;
+            self.otrack_kind = None;
         }
         if let Some(started) = perf_started {
             let elapsed_ms = started.elapsed().as_secs_f64() * 1000.0;
@@ -280,6 +281,7 @@ impl OpenCADStudio {
     pub(in crate::app) fn reset_tracking_after_point(&mut self) {
         self.snapper.clear_tracking();
         self.otrack_active = None;
+        self.otrack_kind = None;
     }
 
     fn update_inner(&mut self, msg: Message) -> Task<Message> {

src/app/update/viewport.rs

@@ -1083,6 +1083,7 @@ impl OpenCADStudio {
             };
 
             self.otrack_active = otrack_hit.map(|hit| (hit.base, hit.dir));
+            self.otrack_kind = otrack_hit.map(|hit| hit.kind);
 
             let mut snapped = if let Some(hit) = otrack_hit {
                 hit.aligned
@@ -1519,6 +1520,7 @@ impl OpenCADStudio {
                 }
             };
             self.otrack_active = otrack_hit.map(|h| (h.base, h.dir));
+            self.otrack_kind = otrack_hit.map(|h| h.kind);
 
             // Parallel snap: with nothing else snapped or tracked, lock
             // the point onto the line through last_point parallel to the

src/app/view/mod.rs

@@ -809,6 +809,17 @@ impl OpenCADStudio {
                     .as_ref()
                     .map(|c| c.prompt())
                     .unwrap_or_default();
+
+                let tracking_hint = match self.otrack_kind {
+                    Some(crate::snap::TrackingKind::Perpendicular) => {
+                        Some("Perpendicular".to_string())
+                    }
+                    Some(crate::snap::TrackingKind::Extension) => {
+                        Some("Extension".to_string())
+                    }
+                    _ => None,
+                };
+
                 Some(crate::ui::overlay::dynamic_input_overlay(
                     tab.last_cursor_screen,
                     tab.last_point_screen,
@@ -816,6 +827,7 @@ impl OpenCADStudio {
                     tab.dyn_guide,
                     boxes,
                     prompt,
+                    tracking_hint,
                 ))
             } else {
                 None