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- Let max. 100 UFOs cross the screen.
This commit is contained in:
Manuel Friedli 2023-01-02 00:26:57 +01:00
commit ea6093bd0a
Signed by: manuel
GPG key ID: 41D08ABA75634DA1
15 changed files with 765 additions and 0 deletions
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version = "0.1.0"
edition = "2021"
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crossterm = "0.25.0"
rand = "0.8.5"

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use std::thread;
use std::time::Duration;
use rand::Rng;
use crate::Direction::{Down, Left, Right, Up};
use crate::movables::{Movable, Ufo};
mod movables;
mod terminal;
const WIDTH: u16 = 160;
const HEIGHT: u16 = 40;
const HEADER_ROW: u16 = 0;
const FOOTER_ROW: u16 = HEIGHT - 1;
const TANK_ROW: u16 = FOOTER_ROW - 1;
const MIN_UFO_ROW: u16 = 1;
const MAX_UFO_ROW: u16 = TANK_ROW - 5;
const DELAY: Duration = Duration::from_millis(10);
const UFO_STR: &str = "<=000=>";
const TANK_STR: &str = "⊆≡≣🠭≣≡⊇";
fn main() {
let terminal = terminal::setup();
const MAX_UFOS: u8 = 100;
let mut ufos = vec![Ufo::create(), Ufo::create(), Ufo::create(), Ufo::create(), Ufo::create()];
let mut n_ufos = ufos.len() as u8;
loop {
let iter_mut = ufos.iter_mut();
for x in iter_mut {
x.mov(Direction::Left);
x.draw();
}
if rand::thread_rng().gen_bool(0.1) && n_ufos < MAX_UFOS {
ufos.push(Ufo::create());
n_ufos += 1;
}
ufos.retain(|ufo| ufo.is_on_screen());
if ufos.is_empty() {
break;
}
thread::sleep(DELAY);
}
// for _ in 0..N_UFOS {
// let mut ufo = Ufo::create();
// while ufo.is_on_screen() {
// ufo.mov(Direction::Left);
// ufo.draw();
// thread::sleep(DELAY);
// }
// }
terminal::restore(terminal);
}
fn tank_at(col: u16) {
terminal::print_str_at(col, TANK_ROW, TANK_STR);
}
pub enum Direction {
Left,
Right,
Up,
Down,
}
impl Direction {
fn invert(&self) -> Direction {
match self {
Left => Right,
Right => Left,
Up => Down,
Down => Up
}
}
}

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use rand::Rng;
use crate::{Direction, MAX_UFO_ROW, MIN_UFO_ROW, TANK_STR, UFO_STR, WIDTH};
use crate::Direction::{Down, Left, Right};
use crate::terminal::print_str_at;
pub trait Movable<T> {
fn create() -> T;
fn mov(&mut self, direction: Direction);
fn draw(&self);
fn is_on_screen(&self) -> bool;
}
impl Movable<Ufo> for Ufo {
fn create() -> Ufo {
let mut rng = rand::thread_rng();
let direction: Direction = if rng.gen() { Left } else { Right };
let row = rng.gen_range(MIN_UFO_ROW..=MAX_UFO_ROW);
let column = match direction {
// If the UFO is moving right, we will initially place it just at the left edge.
Right => -(UFO_STR.len() as i16) + 1,
// If the UFO is moving left, we will initially place it just at the right edge.
Left => WIDTH as i16 - 1,
// Above, we're creating either a Left or a Right direction value. So, we CANNOT get here. Hence: PANIC!
_ => panic!("Programming error. We're not supposed to get here.")
};
Ufo { row, column, direction }
}
fn mov(&mut self, direction: Direction) {
let ufo_str_len = UFO_STR.len() as i16;
match direction {
Down => { todo!("Implement crash movement (down + direction)") }
_ => {
match self.direction {
Left => {
if self.column >= -ufo_str_len {
self.column -= 1;
}
}
Right => {
if self.column < WIDTH as i16 {
self.column += 1;
}
}
_ => { /* Ignore, this can't be the case. */ }
};
}
};
}
fn draw(&self) {
let mut body: String;
let ufo_str_len = UFO_STR.len() as i16;
if self.column < -ufo_str_len {
// left outside
body = String::new();
} else if self.column < 0 {
// left transitioning in/out
body = String::new();
} else if self.column < (WIDTH as i16 - ufo_str_len) {
// normal range
body = String::from(UFO_STR);
match self.direction {
Left => { body.push(' ') }
Right => { body = String::from(" ") + body.as_str() }
Down => { todo!("How do we handle the downward movement?") }
_ => {}
}
let max_len = WIDTH as i16 - self.column;
body.truncate(max_len as usize)
} else if self.column < WIDTH as i16 {
// right transitioning in/out
body = String::new();
} else {
// right outside
body = String::new();
}
print_str_at(if self.column < 0 { 0 } else { self.column as u16 }, self.row, body.as_str())
}
fn is_on_screen(&self) -> bool {
self.column > -(UFO_STR.len() as i16) && self.column < WIDTH as i16
}
}
impl Movable<Tank> for Tank {
fn create() -> Tank {
let column = (WIDTH - TANK_STR.len() as u16) / 2;
Tank { column }
}
fn mov(&mut self, direction: Direction) {
todo!("Implement tank movement")
}
fn draw(&self) {
todo!("Implement drawing tank")
}
fn is_on_screen(&self) -> bool {
todo!("Implement tank visibility check")
}
}
pub struct Ufo {
row: u16,
column: i16,
direction: Direction,
}
pub struct Tank {
column: u16,
}

109
src/terminal.rs Normal file
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use std::io::{stdout, Write};
use crossterm::{execute, queue};
use crossterm::cursor::{Hide, MoveTo, RestorePosition, SavePosition, Show};
use crossterm::style::Print;
use crossterm::terminal::{disable_raw_mode, enable_raw_mode, EnterAlternateScreen, LeaveAlternateScreen, SetSize, size};
use crate::{FOOTER_ROW, HEADER_ROW, HEIGHT, WIDTH};
pub struct Terminal {
cols: u16,
rows: u16,
}
pub fn setup() -> Terminal {
let (cols, rows) = size()
.expect("Failed to get terminal screen size");
execute!(
stdout(),
EnterAlternateScreen,
SetSize(WIDTH, HEIGHT),
Hide
).expect("Failed to set up terminal screen");
enable_raw_mode()
.expect("Failed to enable raw terminal mode");
write_header();
write_footer();
Terminal { cols, rows }
}
pub fn restore(terminal: Terminal) {
disable_raw_mode()
.expect("Failed to disable raw terminal mode");
execute!(
stdout(),
SetSize(terminal.cols, terminal.rows),
Show,
LeaveAlternateScreen
)
.expect("Failed to tear down terminal screen");
}
pub fn write_header() {
queue!(
stdout(),
MoveTo(0,HEADER_ROW),
Print(center_text("UFO goes RUST! ** by fritteli, ufo@fritteli.ch ** Have fun!", None))
).expect("Failed to write to terminal");
stdout().flush().expect("Failed to write to terminal");
}
pub fn write_footer() {
queue!(
stdout(),
MoveTo(0,FOOTER_ROW),
Print(center_text("v0.0.0-dev", None))
).expect("Failed to write to terminal");
stdout().flush().expect("Failed to write to terminal");
}
fn center_text(text: &str, filler: Option<&str>) -> String {
let length = text.len();
let surplus = (WIDTH as i16) - (length as i16) - 2;
if surplus < 0 {
return String::from(text);
}
let left: usize = (surplus as usize) / 2;
let right: usize;
if surplus % 2 == 0 {
right = left;
} else {
right = left + 1;
}
let left_fill = filler.unwrap_or("=").repeat(left);
let right_fill = filler.unwrap_or("=").repeat(right);
format!("{} {} {}", left_fill, text, right_fill)
}
fn print_char_at(col: u16, row: u16, char: char) {
execute!(
stdout(),
SavePosition,
MoveTo(col, row),
Print(char),
RestorePosition
)
.expect("Failed to print char to terminal");
}
pub fn print_str_at(col: u16, row: u16, s: &str) {
execute!(
stdout(),
SavePosition,
MoveTo(col, row),
Print(s),
RestorePosition
)
.expect("Failed to print string to terminal");
}
pub fn clear_pos(col: u16, row: u16) {
print_char_at(col, row, ' ');
}
pub fn clear_stretch(col: u16, row: u16, len: usize) {
print_str_at(col, row, " ".repeat(len).as_str());
}