define the struct Point

src/drawing.rs

@@ -1,9 +1,15 @@
 use std::f64;
 
-  pub fn draw_circle(center: (f64, f64), radius: f64, context: &web_sys::CanvasRenderingContext2d) {
-    let (x, y) = center;
-    context.move_to(x+radius, y);
-    context
-      .arc(x, y, radius, 0.0, f64::consts::PI * 2.0)
-      .unwrap();
-  }
+pub struct Point(pub f64, pub f64);
+
+pub fn draw_circle(center: Point, radius: f64, context: &web_sys::CanvasRenderingContext2d) {
+  context.move_to(center.0+radius, center.1);
+  context
+    .arc(center.0, center.1, radius, 0.0, f64::consts::PI * 2.0)
+    .unwrap();
+}
+
+/*
+pub fn draw_line(p1: Point, p2: Point, context: &web_sys::CanvasRenderingContext2d) {
+}
+*/

src/lib.rs

@@ -1,6 +1,7 @@
 use wasm_bindgen::prelude::*;
 use wasm_bindgen::JsCast;
 pub mod drawing;
+use drawing::Point;
 
 #[wasm_bindgen(start)]
 pub fn start() {
@@ -20,9 +21,9 @@ pub fn start() {
 
   context.begin_path();
 
-  drawing::draw_circle((75.0, 75.0), 70.0, &context);
-  drawing::draw_circle((75.0, 75.0), 35.0, &context);
-  drawing::draw_circle((60.0, 65.0), 5.0, &context);
+  drawing::draw_circle(Point(75.0, 75.0), 70.0, &context);
+  drawing::draw_circle(Point(75.0, 75.0), 35.0, &context);
+  drawing::draw_circle(Point(60.0, 65.0), 5.0, &context);
 
   context.stroke();
 }