implement the next() function

Cargo.toml

@@ -10,6 +10,7 @@ crate-type = ["cdylib"]
 [dependencies]
 js-sys = "0.3.55"
 wasm-bindgen = "0.2.78"
+num-complex = "0.4.0"
 
 [dependencies.web-sys]
 version = "0.3.4"

src/circle.rs

@@ -1,3 +1,6 @@
+extern crate num_complex;
+
+use num_complex::Complex;
 use crate::shapes::*;
 
 /// An iterator containing the shapes to display
@@ -26,6 +29,18 @@ impl Iterator for CircleShapes {
         if self.position == 0 {
             self.position += 1;
             Some(Shape::Circle(self.circle))
+        } else if self.position < self.modulo {
+            let center = Complex::new(self.circle.center.x, self.circle.center.y);
+            let pi = std::f64::consts::PI;
+            let radius = self.circle.radius;
+            let azimuth_1 = (self.position as f64) * 2. * pi / (self.modulo as f64);
+            let azimuth_2 = (self.position * self.factor) as f64 * 2. * pi / self.modulo as f64;
+            let complex_point_1 = Complex::from_polar(radius, azimuth_1) + center;
+            let complex_point_2 = Complex::from_polar(radius, azimuth_2) + center;
+            let p1 = Point { x: complex_point_1.re, y: complex_point_1.im };
+            let p2 = Point { x: complex_point_2.re, y: complex_point_2.im };
+            self.position += 1;
+            Some(Shape::Line(Line {p1, p2}))
         } else {
             None
         }

src/lib.rs

@@ -26,19 +26,9 @@ pub fn start() {
 
     context.begin_path();
   
-    let iter = CircleShapes::new(10, 2, Circle {center: Point {x: 75.0, y: 75.0}, radius: 70.0});
+    let iter = CircleShapes::new(100, 13, Circle {center: Point {x: 75.0, y: 75.0}, radius: 70.0});
     for shape in iter {
         drawing::draw_shape(shape, &context);
     }
-
-/*
-    drawing::draw_circle(Circle {center: Point {x: 75.0, y: 75.0}, radius: 70.0}, &context);
-    drawing::draw_circle(Circle {center: Point {x: 75.0, y: 75.0}, radius: 35.0}, &context);
-    drawing::draw_circle(Circle {center: Point {x: 60.0, y: 65.0}, radius: 5.0}, &context);
-  
-    drawing::draw_line(Line {p1: Point {x: 0.0, y: 0.0}, p2: Point {x: 150.0, y: 150.0}}, &context);
-    drawing::draw_line(Line {p1: Point {x: 0.0, y: 150.0}, p2: Point {x: 150.0, y: 0.0}}, &context);
-*/
-
     context.stroke();
 }