Pass Services into model functions

This makes those functions more composable. Right now, they basically
can't be combined.

models/cuboid/src/lib.rs

@@ -9,9 +9,7 @@ use fj::{
     math::Vector,
 };
 
-pub fn model(x: f64, y: f64, z: f64) -> Handle<Solid> {
+pub fn model(x: f64, y: f64, z: f64, services: &mut Services) -> Handle<Solid> {
-    let mut services = Services::new();
-
     let sketch = Sketch::empty()
         .add_region(
             Region::polygon(
@@ -21,13 +19,13 @@ pub fn model(x: f64, y: f64, z: f64) -> Handle<Solid> {
                     [x / 2., y / 2.],
                     [-x / 2., y / 2.],
                 ],
-                &mut services,
+                services,
             )
-            .insert(&mut services),
+            .insert(services),
         )
-        .insert(&mut services);
+        .insert(services);
 
     let surface = services.objects.surfaces.xy_plane();
     let path = Vector::from([0., 0., z]);
-    (sketch, surface).sweep(path, &mut services)
+    (sketch, surface).sweep(path, services)
 }

models/cuboid/src/main.rs

@@ -1,7 +1,7 @@
-use fj::handle_model;
+use fj::{core::services::Services, handle_model};
 
 fn main() -> fj::Result {
-    let model = cuboid::model(3., 2., 1.);
+    let model = cuboid::model(3., 2., 1., &mut Services::new());
     handle_model(model)?;
     Ok(())
 }

models/spacer/src/lib.rs

@@ -12,24 +12,27 @@ use fj::{
     math::{Point, Vector},
 };
 
-pub fn model(outer: f64, inner: f64, height: f64) -> Handle<Solid> {
+pub fn model(
-    let mut services = Services::new();
+    outer: f64,
-
+    inner: f64,
+    height: f64,
+    services: &mut Services,
+) -> Handle<Solid> {
     let sketch = Sketch::empty()
         .add_region(
-            Region::circle(Point::origin(), outer, &mut services)
+            Region::circle(Point::origin(), outer, services)
                 .add_interiors([Cycle::circle(
                     Point::origin(),
                     inner,
-                    &mut services,
+                    services,
                 )
-                .reverse(&mut services)
+                .reverse(services)
-                .insert(&mut services)])
+                .insert(services)])
-                .insert(&mut services),
+                .insert(services),
         )
-        .insert(&mut services);
+        .insert(services);
 
     let surface = services.objects.surfaces.xy_plane();
     let path = Vector::from([0., 0., height]);
-    (sketch, surface).sweep(path, &mut services)
+    (sketch, surface).sweep(path, services)
 }

models/spacer/src/main.rs

@@ -1,7 +1,7 @@
-use fj::handle_model;
+use fj::{core::services::Services, handle_model};
 
 fn main() -> fj::Result {
-    let model = spacer::model(1., 0.5, 1.);
+    let model = spacer::model(1., 0.5, 1., &mut Services::new());
     handle_model(model)?;
     Ok(())
 }

models/star/src/lib.rs

@@ -14,9 +14,13 @@ use fj::{
     math::Vector,
 };
 
-pub fn model(num_points: u64, r1: f64, r2: f64, h: f64) -> Handle<Solid> {
+pub fn model(
-    let mut services = Services::new();
+    num_points: u64,
-
+    r1: f64,
+    r2: f64,
+    h: f64,
+    services: &mut Services,
+) -> Handle<Solid> {
     let num_vertices = num_points * 2;
     let vertex_iter = (0..num_vertices).map(|i| {
         let angle_rad = 2. * PI / num_vertices as f64 * i as f64;
@@ -39,15 +43,15 @@ pub fn model(num_points: u64, r1: f64, r2: f64, h: f64) -> Handle<Solid> {
 
     let sketch = Sketch::empty()
         .add_region(
-            Region::polygon(outer_points, &mut services)
+            Region::polygon(outer_points, services)
-                .add_interiors([Cycle::polygon(inner_points, &mut services)
+                .add_interiors([Cycle::polygon(inner_points, services)
-                    .reverse(&mut services)
+                    .reverse(services)
-                    .insert(&mut services)])
+                    .insert(services)])
-                .insert(&mut services),
+                .insert(services),
         )
-        .insert(&mut services);
+        .insert(services);
 
     let surface = services.objects.surfaces.xy_plane();
     let path = Vector::from([0., 0., h]);
-    (sketch, surface).sweep(path, &mut services)
+    (sketch, surface).sweep(path, services)
 }

models/star/src/main.rs

@@ -1,7 +1,7 @@
-use fj::handle_model;
+use fj::{core::services::Services, handle_model};
 
 fn main() -> fj::Result {
-    let model = star::model(5, 1., 2., 1.);
+    let model = star::model(5, 1., 2., 1., &mut Services::new());
     handle_model(model)?;
     Ok(())
 }