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@snoyberg snoyberg/main.rs Secret
Created Oct 21, 2018

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Implementation of bounce for Rust crash course lesson 2
use std::fmt::{Display, Formatter};
enum VertDir {
Up,
Down,
}
enum HorizDir {
Left,
Right,
}
struct Ball {
x: u32,
y: u32,
vert_dir: VertDir,
horiz_dir: HorizDir,
}
struct Frame {
width: u32,
height: u32,
}
struct Game {
frame: Frame,
ball: Ball,
}
impl Game {
fn new() -> Game {
let frame = Frame {
width: 60,
height: 30,
};
let ball = Ball {
x: 2,
y: 4,
vert_dir: VertDir::Up,
horiz_dir: HorizDir::Left,
};
Game {frame, ball}
}
fn step(&mut self) {
self.ball.bounce(&self.frame);
self.ball.mv();
}
}
impl Ball {
fn bounce(&mut self, frame: &Frame) {
if self.x == 0 {
self.horiz_dir = HorizDir::Right;
} else if self.x == frame.width - 1 {
self.horiz_dir = HorizDir::Left;
}
if self.y == 0 {
self.vert_dir = VertDir::Down;
} else if self.y == frame.height - 1 {
self.vert_dir = VertDir::Up;
}
}
fn mv(&mut self) {
match self.horiz_dir {
HorizDir::Left => self.x -= 1,
HorizDir::Right => self.x += 1,
}
match self.vert_dir {
VertDir::Up => self.y -= 1,
VertDir::Down => self.y += 1,
}
}
}
impl Display for Game {
fn fmt(&self, fmt: &mut Formatter) -> std::fmt::Result {
let top_bottom = |fmt: &mut Formatter| {
write!(fmt, "+");
for _ in 0..self.frame.width {
write!(fmt, "-");
}
write!(fmt, "+\n")
};
top_bottom(fmt)?;
for row in 0..self.frame.height {
write!(fmt, "|");
for column in 0..self.frame.width {
let c = if row == self.ball.y && column == self.ball.x {
'o'
} else {
' '
};
write!(fmt, "{}", c);
}
write!(fmt, "|\n");
}
top_bottom(fmt)
}
}
fn main () {
let mut game = Game::new();
let sleep_duration = std::time::Duration::from_millis(33);
loop {
println!("{}", game);
game.step();
std::thread::sleep(sleep_duration);
}
}
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