tuple::new can take any type of number

src/main.rs

@@ -175,7 +175,7 @@ fn clock() {
     let mut canvas = Canvas::new(1024, 1024);
     let color = Color::new(1.0, 0.0, 0.0);
     let middle = 1024.0 / 2.0;
-    canvas.write_pixel(middle as usize, middle as usize, Color::new(0.0, 1.0, 0.0));
+
     let middle_point = &Tuple::point_zero() * &Matrix::translation(middle, middle, 0.0);
     draw_cross(&mut canvas, &middle_point, Color::new(0.0, 1.0, 0.0));