lib.rs

impl Game {
    // ...
    pub fn is_over(&self) -> bool {
        let snake_len = self.snake.len();
        let last = self.snake[snake_len - 1];
        let Vector { x, y } = last;
        if x < 0_f64 || x > f64::from(self.width) || y < 0_f64 || y > f64::from(self.height) {
            return true;
        }
        if snake_len < 5 {
            return false;
        }

        let segments = get_segments_from_vectors(&self.snake[..snake_len - 3]);
        return segments.iter().any(|segment| {
            let projected = segment.get_projected_point(&last);
            segment.is_point_inside(&projected) && Segment::new(&last, &projected).length() < 0.5
        });
    }
    // ...
}