начал писать turtle impl

src/main.rs

@@ -3,12 +3,7 @@ mod turtle;
 use turtle::Turtle;
 
 fn main() {
-
     let mut turtle = Turtle::new();
-    println!("Pos = {:?}", turtle.position());
-
-    let start = (50, 50);
-    let end = (200, 200);
-    turtle.draw_line(start, end);
+    turtle.draw_line((50, 50), (200, 200));
     turtle.save("output.png").unwrap();
 }

src/turtle.rs

@@ -10,11 +10,12 @@ type Coord = (i32, i32);
 
 const DEFAULT_WIDTH: u32 = 800;
 const DEFAULT_HEIGHT: u32 = 800;
+const DEFAULT_BACKGROUND_COLOUR: Colour = Rgb([255u8, 255u8, 255u8]);
+const DEFAULT_COLOUR: Colour = Rgb([0u8, 0u8, 0u8]);
 
 pub struct Turtle {
     buf: ImgBufU8,
     colour: Colour,
-    background_colour: Colour,
     pos: Coord,
     angle: f64,
 }
@@ -23,13 +24,12 @@ impl Turtle {
     pub fn new() -> Self {
         let mut buf = ImageBuffer::new(DEFAULT_WIDTH, DEFAULT_HEIGHT);
         for pixel in buf.pixels_mut() {
-            *pixel = Rgb([255u8, 255u8, 255u8]);
+            *pixel = DEFAULT_BACKGROUND_COLOUR;
         }
 
         Turtle {
             buf,
-            colour: Rgb([0u8, 0u8, 0u8]),
-            background_colour: Rgb([255u8, 255u8, 255u8]),
+            colour: DEFAULT_COLOUR,
             pos: (0, 0),
             angle: 0.0,
         }