Add layer infrastructure for Geometry

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

@@ -0,0 +1,46 @@
+//! Layer infrastructure for [`Geometry`]
+
+use crate::{
+    geometry::{Geometry, SurfaceGeometry},
+    objects::Surface,
+    storage::Handle,
+};
+
+use super::{Command, Event, Layer};
+
+impl Layer<Geometry> {
+    /// Define the geometry of the provided surface
+    pub fn define_surface(
+        &mut self,
+        surface: Handle<Surface>,
+        geometry: SurfaceGeometry,
+    ) {
+        let mut events = Vec::new();
+        self.process(DefineSurface { surface, geometry }, &mut events);
+    }
+}
+
+/// Define the geometry of a surface
+pub struct DefineSurface {
+    surface: Handle<Surface>,
+    geometry: SurfaceGeometry,
+}
+
+impl Command<Geometry> for DefineSurface {
+    type Result = ();
+    type Event = Self;
+
+    fn decide(
+        self,
+        _: &Geometry,
+        events: &mut Vec<Self::Event>,
+    ) -> Self::Result {
+        events.push(self);
+    }
+}
+
+impl Event<Geometry> for DefineSurface {
+    fn evolve(&self, state: &mut Geometry) {
+        state.define_surface_inner(self.surface.clone(), self.geometry);
+    }
+}

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

@@ -1,4 +1,5 @@
 use crate::{
+    geometry::Geometry,
     objects::Objects,
     presentation::Presentation,
     validation::{Validation, ValidationConfig},
@@ -27,6 +28,11 @@ pub struct Layers {
     /// shapes.
     pub objects: Layer<Objects>,
 
+    /// The geometry layer
+    ///
+    /// Manages geometric information that applies to topological objects.
+    pub geometry: Layer<Geometry>,
+
     /// The validation layer
     ///
     /// Monitors objects and validates them, as they are inserted.
@@ -42,9 +48,11 @@ impl Layers {
     /// Construct an instance of `Layers`
     pub fn new() -> Self {
         let objects = Objects::new();
+        let geometry = Geometry::new(&objects);
 
         Self {
             objects: Layer::new(objects),
+            geometry: Layer::new(geometry),
             validation: Layer::default(),
             presentation: Layer::default(),
         }

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

@@ -2,6 +2,7 @@
 //!
 //! See [`Layers`].
 
+pub mod geometry;
 pub mod objects;
 pub mod presentation;
 pub mod validation;