Fix API for defining curve geometry

The previous version would not allow defining local curve geometry for
multiple surfaces.

crates/fj-core/src/geometry/geometry.rs

@@ -7,7 +7,7 @@ use crate::{
     topology::{Curve, HalfEdge, Surface, Topology},
 };
 
-use super::{CurveGeom, GlobalPath, HalfEdgeGeom, SurfaceGeom};
+use super::{CurveGeom, GlobalPath, HalfEdgeGeom, LocalCurveGeom, SurfaceGeom};
 
 /// Geometric data that is associated with topological objects
 pub struct Geometry {
@@ -65,9 +65,14 @@ impl Geometry {
     pub(crate) fn define_curve_inner(
         &mut self,
         curve: Handle<Curve>,
-        geometry: CurveGeom,
+        surface: Handle<Surface>,
+        geometry: LocalCurveGeom,
     ) {
-        self.curve.insert(curve, geometry);
+        self.curve
+            .entry(curve)
+            .or_default()
+            .definitions
+            .insert(surface, geometry);
     }
 
     pub(crate) fn define_half_edge_inner(

crates/fj-core/src/layers/geometry.rs

@@ -1,7 +1,7 @@
 //! Layer infrastructure for [`Geometry`]
 
 use crate::{
-    geometry::{CurveGeom, Geometry, HalfEdgeGeom, SurfaceGeom},
+    geometry::{Geometry, HalfEdgeGeom, LocalCurveGeom, SurfaceGeom},
     storage::Handle,
     topology::{Curve, HalfEdge, Surface},
 };
@@ -10,9 +10,21 @@ use super::{Command, Event, Layer};
 
 impl Layer<Geometry> {
     /// Define the geometry of the provided curve
-    pub fn define_curve(&mut self, curve: Handle<Curve>, geometry: CurveGeom) {
+    pub fn define_curve(
+        &mut self,
+        curve: Handle<Curve>,
+        surface: Handle<Surface>,
+        geometry: LocalCurveGeom,
+    ) {
         let mut events = Vec::new();
-        self.process(DefineCurve { curve, geometry }, &mut events);
+        self.process(
+            DefineCurve {
+                curve,
+                surface,
+                geometry,
+            },
+            &mut events,
+        );
     }
 
     /// Define the geometry of the provided half-edge
@@ -50,7 +62,8 @@ impl Layer<Geometry> {
 /// Define the geometry of a curve
 pub struct DefineCurve {
     curve: Handle<Curve>,
-    geometry: CurveGeom,
+    surface: Handle<Surface>,
+    geometry: LocalCurveGeom,
 }
 
 impl Command<Geometry> for DefineCurve {
@@ -68,7 +81,11 @@ impl Command<Geometry> for DefineCurve {
 
 impl Event<Geometry> for DefineCurve {
     fn evolve(&self, state: &mut Geometry) {
-        state.define_curve_inner(self.curve.clone(), self.geometry.clone());
+        state.define_curve_inner(
+            self.curve.clone(),
+            self.surface.clone(),
+            self.geometry.clone(),
+        );
     }
 }
 

crates/fj-core/src/operations/build/half_edge.rs

@@ -2,7 +2,7 @@ use fj_interop::ext::ArrayExt;
 use fj_math::{Arc, Point, Scalar};
 
 use crate::{
-    geometry::{CurveGeom, HalfEdgeGeom, SurfacePath},
+    geometry::{HalfEdgeGeom, LocalCurveGeom, SurfacePath},
     operations::{geometry::UpdateHalfEdgeGeometry, insert::Insert},
     storage::Handle,
     topology::{Curve, HalfEdge, Surface, Vertex},
@@ -65,7 +65,8 @@ pub trait BuildHalfEdge {
 
         core.layers.geometry.define_curve(
             half_edge.curve().clone(),
-            CurveGeom::from_path_and_surface(path, surface),
+            surface,
+            LocalCurveGeom { path },
         );
         core.layers.geometry.define_half_edge(
             half_edge.clone(),
@@ -93,7 +94,8 @@ pub trait BuildHalfEdge {
 
         core.layers.geometry.define_curve(
             half_edge.curve().clone(),
-            CurveGeom::from_path_and_surface(path, surface),
+            surface,
+            LocalCurveGeom { path },
         );
         core.layers.geometry.define_half_edge(
             half_edge.clone(),
@@ -123,7 +125,8 @@ pub trait BuildHalfEdge {
 
         core.layers.geometry.define_curve(
             half_edge.curve().clone(),
-            CurveGeom::from_path_and_surface(path, surface),
+            surface,
+            LocalCurveGeom { path },
         );
         core.layers.geometry.define_half_edge(
             half_edge.clone(),

crates/fj-core/src/operations/geometry/curve.rs

@@ -1,5 +1,5 @@
 use crate::{
-    geometry::{CurveGeom, Geometry, SurfacePath},
+    geometry::{Geometry, LocalCurveGeom, SurfacePath},
     layers::Layer,
     storage::Handle,
     topology::{Curve, Surface},
@@ -23,10 +23,7 @@ impl UpdateCurveGeometry for Handle<Curve> {
         surface: Handle<Surface>,
         geometry: &mut Layer<Geometry>,
     ) -> Self {
-        geometry.define_curve(
-            self.clone(),
-            CurveGeom::from_path_and_surface(path, surface),
-        );
+        geometry.define_curve(self.clone(), surface, LocalCurveGeom { path });
 
         self
     }