shapes: use a builder pattern with helps in prelude.

rtchallenge/src/shapes.rs

@@ -44,7 +44,7 @@ impl PartialEq for Geometry {
 /// many different shapes based on the value of it's geometry field.  Users chose the shape by
 /// calling the appropriate constructor, i.e. [Shape::sphere].
 #[derive(Builder, Debug, Clone, PartialEq)]
-#[builder(default)]
+#[builder(default, pattern = "owned")]
 pub struct Shape {
     transform: Matrix4x4,
     #[builder(private, default = "self.default_inverse_transform()?")]
@@ -53,41 +53,93 @@ pub struct Shape {
     geometry: Geometry,
 }
 
-/// Short hand for creating a Shape with a plane geometry.
+/// Short hand for creating a ShapeBuilder with a plane geometry.
 ///
 /// # Examples
 /// ```
 /// use rtchallenge::shapes::{plane, Shape};
-///
-/// assert_eq!(plane(), Shape::plane());
+/// # fn main() -> Result<(), Box<std::error::Error>> {
+/// assert_eq!(plane().build()?, Shape::plane());
+/// # Ok(())
+/// # }
 /// ```
-pub fn plane() -> Shape {
-    Shape::plane()
+pub fn plane() -> ShapeBuilder {
+    ShapeBuilder::plane()
 }
-/// Short hand for creating a Shape with a sphere geometry.
+/// Short hand for creating a ShapeBuilder with a sphere geometry.
 ///
 /// # Examples
 /// ```
 /// use rtchallenge::shapes::{sphere, Shape};
 ///
-/// assert_eq!(sphere(), Shape::sphere());
+/// # fn main() -> Result<(), Box<std::error::Error>> {
+/// assert_eq!(sphere().build()?, Shape::sphere());
+/// # Ok(())
+/// # }
 /// ```
-pub fn sphere() -> Shape {
-    Shape::sphere()
+pub fn sphere() -> ShapeBuilder {
+    ShapeBuilder::sphere()
 }
-/// Short hand for creating a Shape with a test shape geometry.
+/// Short hand for creating a ShapeBuilder with a test shape geometry.
 ///
 /// # Examples
 /// ```
 /// use rtchallenge::shapes::{test_shape, Shape};
 ///
-/// assert_eq!(test_shape(), Shape::test_shape());
+/// # fn main() -> Result<(), Box<std::error::Error>> {
+/// assert_eq!(test_shape().build()?, Shape::test_shape());
+/// # Ok(())
+/// # }
 /// ```
-pub fn test_shape() -> Shape {
-    Shape::test_shape()
+pub fn test_shape() -> ShapeBuilder {
+    ShapeBuilder::test_shape()
 }
 
 impl ShapeBuilder {
+    /// Short hand for creating a ShapeBuilder with a plane geometry.
+    ///
+    /// # Examples
+    /// ```
+    /// use rtchallenge::shapes::{plane, Shape};
+    ///
+    /// # fn main() -> Result<(), Box<std::error::Error>> {
+    /// assert_eq!(plane().build()?, Shape::plane());
+    /// # Ok(())
+    /// # }
+    /// ```
+    pub fn plane() -> ShapeBuilder {
+        ShapeBuilder::default().geometry(Geometry::Plane)
+    }
+    /// Short hand for creating a ShapeBuilder with a sphere geometry.
+    ///
+    /// # Examples
+    /// ```
+    /// use rtchallenge::shapes::{sphere, Shape};
+    ///
+    /// # fn main() -> Result<(), Box<std::error::Error>> {
+    /// assert_eq!(sphere().build()?, Shape::sphere());
+    /// # Ok(())
+    /// # }
+    /// ```
+    pub fn sphere() -> ShapeBuilder {
+        ShapeBuilder::default().geometry(Geometry::Sphere)
+    }
+    /// Short hand for creating a ShapeBuilder with a test shape geometry.
+    ///
+    /// # Examples
+    /// ```
+    /// use rtchallenge::shapes::{test_shape, Shape};
+    ///
+    /// # fn main() -> Result<(), Box<std::error::Error>> {
+    /// assert_eq!(test_shape().build()?, Shape::test_shape());
+    /// # Ok(())
+    /// # }
+    /// ```
+    pub fn test_shape() -> ShapeBuilder {
+        ShapeBuilder::default().geometry(Geometry::TestShape(Arc::new(Mutex::new(
+            TestData::default(),
+        ))))
+    }
     fn default_inverse_transform(&self) -> Result<Matrix4x4, String> {
         Ok(self.transform.unwrap_or(Matrix4x4::identity()).inverse())
     }