Add missing documentation in fj

fj/src/lib.rs

@@ -21,6 +21,9 @@ pub use self::{shape_2d::*, shape_3d::*};
 #[derive(Clone, Debug)]
 #[repr(C)]
 pub enum Shape {
+    /// A 2D shape
     Shape2d(Shape2d),
+
+    /// A 3D shape
     Shape3d(Shape3d),
 }

fj/src/shape_2d.rs

@@ -46,6 +46,7 @@ impl Circle {
         }
     }
 
+    /// Access the circle's radius
     pub fn radius(&self) -> f64 {
         self.radius
     }
@@ -91,6 +92,7 @@ pub struct Difference2d {
 }
 
 impl Difference2d {
+    /// Create a `Difference2d` from two shapes
     pub fn from_objects(a: Shape2d, b: Shape2d) -> Self {
         Self { a, b }
     }
@@ -100,10 +102,12 @@ impl Difference2d {
         self.a.color()
     }
 
+    /// Access the original shape
     pub fn a(&self) -> &Shape2d {
         &self.a
     }
 
+    /// Access the shape being subtracted
     pub fn b(&self) -> &Shape2d {
         &self.b
     }

fj/src/shape_3d.rs

@@ -99,18 +99,22 @@ pub struct Sweep {
 }
 
 impl Sweep {
+    /// Create a `Sweep` from a shape and a length
     pub fn from_shape_and_length(shape: Shape2d, length: f64) -> Self {
         Self { shape, length }
     }
 
+    /// Access the shape being swept
     pub fn shape(&self) -> &Shape2d {
         &self.shape
     }
 
+    /// Access the length of the sweep
     pub fn length(&self) -> f64 {
         self.length
     }
 
+    /// Access the color of the shape being swept
     pub fn color(&self) -> [u8; 4] {
         self.shape().color()
     }