Write documentation for new `canvas` module

1 files changed, 17 insertions, 151 deletions

diff --git a/wgpu/src/widget/canvas/path.rs b/wgpu/src/widget/canvas/path.rs
index b70d0aef..15c2e853 100644
--- a/wgpu/src/widget/canvas/path.rs
+++ b/wgpu/src/widget/canvas/path.rs
@@ -1,13 +1,28 @@
-use iced_native::{Point, Size, Vector};
+//! Build different kinds of 2D shapes.
+pub mod arc;
 
-use lyon::path::builder::{Build, FlatPathBuilder, PathBuilder, SvgBuilder};
+mod builder;
 
+pub use arc::Arc;
+pub use builder::Builder;
+
+/// An immutable set of points that may or may not be connected.
+///
+/// A single [`Path`] can represent different kinds of 2D shapes!
+///
+/// [`Path`]: struct.Path.html
 #[derive(Debug, Clone)]
 pub struct Path {
     raw: lyon::path::Path,
 }
 
 impl Path {
+    /// Creates a new [`Path`] with the provided closure.
+    ///
+    /// Use the [`Builder`] to configure your [`Path`].
+    ///
+    /// [`Path`]: struct.Path.html
+    /// [`Builder`]: struct.Builder.html
     pub fn new(f: impl FnOnce(&mut Builder)) -> Self {
         let mut builder = Builder::new();
 
@@ -32,152 +47,3 @@ impl Path {
         }
     }
 }
-
-#[allow(missing_debug_implementations)]
-pub struct Builder {
-    raw: lyon::path::builder::SvgPathBuilder<lyon::path::Builder>,
-}
-
-impl Builder {
-    pub fn new() -> Builder {
-        Builder {
-            raw: lyon::path::Path::builder().with_svg(),
-        }
-    }
-
-    #[inline]
-    pub fn move_to(&mut self, point: Point) {
-        let _ = self.raw.move_to(lyon::math::Point::new(point.x, point.y));
-    }
-
-    #[inline]
-    pub fn line_to(&mut self, point: Point) {
-        let _ = self.raw.line_to(lyon::math::Point::new(point.x, point.y));
-    }
-
-    #[inline]
-    pub fn arc(&mut self, arc: Arc) {
-        self.ellipse(arc.into());
-    }
-
-    pub fn arc_to(&mut self, a: Point, b: Point, radius: f32) {
-        use lyon::{math, path};
-
-        let a = math::Point::new(a.x, a.y);
-
-        if self.raw.current_position() != a {
-            let _ = self.raw.line_to(a);
-        }
-
-        let _ = self.raw.arc_to(
-            math::Vector::new(radius, radius),
-            math::Angle::radians(0.0),
-            path::ArcFlags::default(),
-            math::Point::new(b.x, b.y),
-        );
-    }
-
-    pub fn ellipse(&mut self, ellipse: Ellipse) {
-        use lyon::{geom, math};
-
-        let arc = geom::Arc {
-            center: math::Point::new(ellipse.center.x, ellipse.center.y),
-            radii: math::Vector::new(ellipse.radii.x, ellipse.radii.y),
-            x_rotation: math::Angle::radians(ellipse.rotation),
-            start_angle: math::Angle::radians(ellipse.start_angle),
-            sweep_angle: math::Angle::radians(ellipse.end_angle),
-        };
-
-        let _ = self.raw.move_to(arc.sample(0.0));
-
-        arc.for_each_quadratic_bezier(&mut |curve| {
-            let _ = self.raw.quadratic_bezier_to(curve.ctrl, curve.to);
-        });
-    }
-
-    #[inline]
-    pub fn bezier_curve_to(
-        &mut self,
-        control_a: Point,
-        control_b: Point,
-        to: Point,
-    ) {
-        use lyon::math;
-
-        let _ = self.raw.cubic_bezier_to(
-            math::Point::new(control_a.x, control_a.y),
-            math::Point::new(control_b.x, control_b.y),
-            math::Point::new(to.x, to.y),
-        );
-    }
-
-    #[inline]
-    pub fn quadratic_curve_to(&mut self, control: Point, to: Point) {
-        use lyon::math;
-
-        let _ = self.raw.quadratic_bezier_to(
-            math::Point::new(control.x, control.y),
-            math::Point::new(to.x, to.y),
-        );
-    }
-
-    #[inline]
-    pub fn rectangle(&mut self, p: Point, size: Size) {
-        self.move_to(p);
-        self.line_to(Point::new(p.x + size.width, p.y));
-        self.line_to(Point::new(p.x + size.width, p.y + size.height));
-        self.line_to(Point::new(p.x, p.y + size.height));
-        self.close();
-    }
-
-    #[inline]
-    pub fn circle(&mut self, center: Point, radius: f32) {
-        self.arc(Arc {
-            center,
-            radius,
-            start_angle: 0.0,
-            end_angle: 2.0 * std::f32::consts::PI,
-        });
-    }
-
-    #[inline]
-    pub fn close(&mut self) {
-        self.raw.close()
-    }
-
-    #[inline]
-    pub fn build(self) -> Path {
-        Path {
-            raw: self.raw.build(),
-        }
-    }
-}
-
-#[derive(Debug, Clone, Copy)]
-pub struct Arc {
-    pub center: Point,
-    pub radius: f32,
-    pub start_angle: f32,
-    pub end_angle: f32,
-}
-
-#[derive(Debug, Clone, Copy)]
-pub struct Ellipse {
-    pub center: Point,
-    pub radii: Vector,
-    pub rotation: f32,
-    pub start_angle: f32,
-    pub end_angle: f32,
-}
-
-impl From<Arc> for Ellipse {
-    fn from(arc: Arc) -> Ellipse {
-        Ellipse {
-            center: arc.center,
-            radii: Vector::new(arc.radius, arc.radius),
-            rotation: 0.0,
-            start_angle: arc.start_angle,
-            end_angle: arc.end_angle,
-        }
-    }
-}