Add FaceBuilder

crates/fj-kernel/src/builder/face.rs

@@ -0,0 +1,58 @@
+use fj_interop::mesh::Color;
+
+use crate::{
+    insert::Insert,
+    objects::{Face, Objects, Surface},
+    services::Service,
+    storage::Handle,
+};
+
+use super::CycleBuilder;
+
+/// Builder API for [`Face`]
+pub struct FaceBuilder {
+    surface: Handle<Surface>,
+    exterior: CycleBuilder,
+    interiors: Vec<CycleBuilder>,
+    color: Option<Color>,
+}
+impl FaceBuilder {
+    /// Create an instance of `FaceBuilder`
+    pub fn new(surface: Handle<Surface>) -> Self {
+        Self {
+            surface,
+            exterior: CycleBuilder::new(),
+            interiors: Vec::new(),
+            color: None,
+        }
+    }
+
+    /// Replace the face's exterior cycle
+    pub fn with_exterior(mut self, exterior: CycleBuilder) -> Self {
+        self.exterior = exterior;
+        self
+    }
+
+    /// Add an interior cycle to the face
+    pub fn with_interior(mut self, interior: CycleBuilder) -> Self {
+        self.interiors.push(interior);
+        self
+    }
+
+    /// Define the color of the face
+    pub fn with_color(mut self, color: Color) -> Self {
+        self.color = Some(color);
+        self
+    }
+
+    /// Build the face
+    pub fn build(self, objects: &mut Service<Objects>) -> Face {
+        let exterior = self.exterior.build(objects).insert(objects);
+        let interiors = self
+            .interiors
+            .into_iter()
+            .map(|cycle| cycle.build(objects).insert(objects));
+
+        Face::new(self.surface, exterior, interiors, self.color)
+    }
+}

crates/fj-kernel/src/builder/mod.rs

@@ -3,5 +3,6 @@
 // These are new-style builders that build on top of the partial object API.
 mod cycle;
 mod edge;
+mod face;
 
-pub use self::{cycle::CycleBuilder, edge::HalfEdgeBuilder};
+pub use self::{cycle::CycleBuilder, edge::HalfEdgeBuilder, face::FaceBuilder};