Method draw

src/invaders.rs:107–118

(&self, frame: &mut Frame)

impl Drawable for Invaders {
    fn draw(&self, frame: &mut Frame) {
        for invader in self.army.iter() {
            frame[invader.x][invader.y] = if (self.move_timer.remaining().as_secs_f32()
                / self.move_timer.duration().as_secs_f32())
                > 0.5
            {
                'x'
            } else {
                '+'
            }
        }
    }
}