Fix Concentric build integration

src/modules/parametric/concentric.rs

@@ -55,8 +55,8 @@ impl ConcentricConstraintCommand {
                 let planar = crate::entities::curve::entity_curve(entity)?;
                 let local = planar.plane.project(point.to_array())?;
                 let segments = planar.curve.segments();
-                let (index, segment) = cadkernel::geom2d::nearest_of(segments.iter(), local)?;
-                matches!(segment, cadkernel::geom2d::Curve::Arc(_))
+                let (index, _) = cadkernel::geom2d::nearest_of(segments.iter(), local)?;
+                matches!(segments.get(index), Some(cadkernel::geom2d::Curve::Arc(_)))
                     .then(|| ParametricRef::segment_center(handle, index))
             }
             _ => None,

src/modules/parametric/mod.rs

@@ -23,8 +23,8 @@ pub use point_on_entity::{
 };
 pub use tangent_command::TangentConstraintCommand;
 pub use tools::{
-    colinear, concentric, equal, fixed, horizontal, normal, parallel, perpendicular, symmetric,
-    tangent, vertical,
+    colinear, concentric as concentric_tool, equal, fixed, horizontal, normal, parallel,
+    perpendicular, symmetric, tangent, vertical,
 };
 pub use value::{
     angle_tool, dimensional_tools, distance_tool, AngleConstraintCommand,
@@ -67,7 +67,7 @@ impl CadModule for ParametricModule {
                             "SMOOTHCONSTRAINT", "Smooth",
                             include_bytes!("../../../assets/icons/constrain/smooth.svg"),
                         )),
-                        RibbonItem::LargeTool(concentric::tool()),
+                        RibbonItem::LargeTool(concentric_tool::tool()),
                         RibbonItem::LargeTool(horizontal::tool()),
                         RibbonItem::LargeTool(symmetric::tool()),
                         RibbonItem::LargeTool(fixed::tool()),

src/scene/parametric_constraints.rs

@@ -837,11 +837,11 @@ fn glyph_placement_for_reference(
     if let Some(segment) = r.segment_center_index() {
         let planar = crate::entities::curve::entity_curve(entity)?;
         let curve = planar.curve.segments().into_iter().nth(segment)?;
+        let on_arc = planar.plane.point_at(curve.point_at(0.5));
         let cadkernel::geom2d::Curve::Arc(arc) = curve else {
             return None;
         };
         let center = planar.plane.point_at(arc.centre);
-        let on_arc = planar.plane.point_at(arc.point_at(0.5));
         let center = Vector3::new(center[0], center[1], center[2]);
         let on_arc = Vector3::new(on_arc[0], on_arc[1], on_arc[2]);
         return Some((on_arc, on_arc - center));