turtle 1.0.0-rc.3

Learn the Rust language by creating animated drawings!
Documentation 
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use turtle::{Turtle, Color};

fn main() {
    let mut turtle = Turtle::new();
    turtle.drawing_mut().set_background_color("pink");

    for i in 0..36 {
        let base_color: Color = if i % 2 == 0 {
            "red".into()
        } else {
            "white".into()
        };
        turtle.set_fill_color(base_color.with_alpha(1.0 - i as f64 / 54.0));
        turtle.begin_fill();
        square(&mut turtle);
        turtle.end_fill();
        turtle.right(10.0);
    }
}

fn square(turtle: &mut Turtle) {
    for _ in 0..4 {
        turtle.forward(200.0);
        turtle.right(90.0);
    }
}