From 76df374624e5d82dcb2670789a6c4ff228dda9e9 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?H=C3=A9ctor=20Ram=C3=B3n=20Jim=C3=A9nez?=
 <hector0193@gmail.com>
Date: Fri, 14 Feb 2020 02:23:41 +0100
Subject: [PATCH] Implement additional methods in `path::Builder`

---
 examples/clock/src/main.rs     |  9 +---
 wgpu/src/widget/canvas/path.rs | 85 ++++++++++++++++++++++++++++++----
 2 files changed, 76 insertions(+), 18 deletions(-)

diff --git a/examples/clock/src/main.rs b/examples/clock/src/main.rs
index 25a213cd..0a70709f 100644
--- a/examples/clock/src/main.rs
+++ b/examples/clock/src/main.rs
@@ -94,14 +94,7 @@ impl canvas::layer::Drawable for LocalTime {
         let radius = frame.width().min(frame.height()) / 2.0;
         let offset = Vector::new(center.x, center.y);
 
-        let clock = canvas::Path::new(|path| {
-            path.arc(canvas::path::Arc {
-                center,
-                radius,
-                start_angle: 0.0,
-                end_angle: 2.0 * std::f32::consts::PI,
-            })
-        });
+        let clock = canvas::Path::new(|path| path.circle(center, radius));
 
         frame.fill(
             &clock,
diff --git a/wgpu/src/widget/canvas/path.rs b/wgpu/src/widget/canvas/path.rs
index c8ba10e1..8847ea29 100644
--- a/wgpu/src/widget/canvas/path.rs
+++ b/wgpu/src/widget/canvas/path.rs
@@ -1,4 +1,6 @@
-use iced_native::{Point, Vector};
+use iced_native::{Point, Size, Vector};
+
+use lyon::path::builder::{Build, FlatPathBuilder, PathBuilder, SvgBuilder};
 
 #[derive(Debug, Clone)]
 pub struct Path {
@@ -23,13 +25,13 @@ impl Path {
 
 #[allow(missing_debug_implementations)]
 pub struct Builder {
-    raw: lyon::path::Builder,
+    raw: lyon::path::builder::SvgPathBuilder<lyon::path::Builder>,
 }
 
 impl Builder {
     pub fn new() -> Builder {
         Builder {
-            raw: lyon::path::Path::builder(),
+            raw: lyon::path::Path::builder().with_svg(),
         }
     }
 
@@ -48,14 +50,32 @@ impl Builder {
         self.ellipse(arc.into());
     }
 
-    #[inline]
+    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) {
-        let arc = lyon::geom::Arc {
-            center: lyon::math::Point::new(ellipse.center.x, ellipse.center.y),
-            radii: lyon::math::Vector::new(ellipse.radii.x, ellipse.radii.y),
-            x_rotation: lyon::math::Angle::radians(ellipse.rotation),
-            start_angle: lyon::math::Angle::radians(ellipse.start_angle),
-            sweep_angle: lyon::math::Angle::radians(ellipse.end_angle),
+        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));
@@ -65,6 +85,51 @@ impl Builder {
         });
     }
 
+    #[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()