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use owo_colors::OwoColorize;
use rand::prelude::*;
use rand::rngs::ThreadRng;
use std::fmt;
#[derive(Debug, Default)]
pub struct Generator {
pub map: Vec<usize>,
pub width: usize,
pub height: usize,
rooms: Vec<Room>,
}
impl Generator {
pub fn new() -> Self {
Self::default()
}
fn spawn_base(&mut self, number: usize, rng: &mut ThreadRng) -> usize {
let start = rng.gen_range(0, self.map.len());
self.map[start] = number;
start
}
fn populate(&mut self, start: usize, probability: f64, rng: &mut ThreadRng) {
let number = self.map[start];
let candidates = vec![
start.saturating_sub(1),
start + 1,
start.saturating_sub(self.width),
start + self.width,
];
for candidate in candidates {
let remainder = candidate % self.width;
if candidate > 0
&& candidate < self.map.len()
&& remainder > 0
&& remainder < self.width
{
let should_spawn = rng.gen_bool(probability);
if should_spawn {
self.map[candidate] = number;
self.populate(candidate, probability / 2., rng);
}
}
}
}
fn spawn_room(&mut self, number: usize, size: &Size, rng: &mut ThreadRng) -> &mut Self {
let mut x = rng.gen_range(0, self.width);
let mut y = rng.gen_range(0, self.height);
let width = rng.gen_range(size.min_size.0, size.max_size.0);
let height = rng.gen_range(size.min_size.1, size.max_size.1);
if x + width > self.width {
x = self.width - width;
}
if y + height > self.height {
y = self.height - height;
}
let mut collides = false;
let room = Room::new(x, y, width, height);
for other_room in &self.rooms {
if room.intersects(&other_room) {
collides = true;
break;
}
}
if !collides {
for row in 0..height {
for col in 0..width {
let pos = (room.x + col, room.y + row);
self.map[pos.0 + pos.1 * self.width] = number;
}
}
self.rooms.push(room);
}
self
}
pub fn show(&self) {
println!("{}", self);
}
pub fn get_2d_map(&self) -> Vec<Vec<usize>> {
self.map.chunks(self.width).fold(vec![], |mut map, chunk| {
map.push(chunk.into());
map
})
}
pub fn with_size(&mut self, width: usize, height: usize) -> &mut Self {
self.map = vec![0; width * height];
self.width = width;
self.height = height;
self
}
pub fn spawn_terrain(&mut self, number: usize, repeats: usize) -> &mut Self {
let mut rng = rand::thread_rng();
for _ in 0..repeats {
let start = self.spawn_base(number, &mut rng);
self.populate(start, 0.5, &mut rng);
}
self
}
pub fn spawn_rooms(&mut self, number: usize, rooms: usize, size: &Size) -> &mut Self {
let mut rng = rand::thread_rng();
for _ in 0..rooms {
self.spawn_room(number, size, &mut rng);
}
self
}
}
impl fmt::Display for Generator {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
for y in 0..self.height {
for x in 0..self.width {
let value = self.map[x + y * self.width];
let remainder = value % 7;
match remainder {
1 => write!(f, "{:?} ", value.red())?,
2 => write!(f, "{:?} ", value.green())?,
3 => write!(f, "{:?} ", value.cyan())?,
4 => write!(f, "{:?} ", value.magenta())?,
5 => write!(f, "{:?} ", value.white())?,
6 => write!(f, "{:?} ", value.yellow())?,
_ => write!(f, "{:?} ", value.blue())?,
}
}
if y < self.height - 1 {
write!(f, "\n")?
}
}
Ok(())
}
}
pub struct Size {
pub min_size: (usize, usize),
pub max_size: (usize, usize),
}
impl Size {
pub fn new(min_size: (usize, usize), max_size: (usize, usize)) -> Self {
Self {
min_size,
max_size,
}
}
}
#[derive(Debug)]
struct Room {
x: usize,
y: usize,
x2: usize,
y2: usize,
width: usize,
height: usize,
}
impl Room {
fn new(x: usize, y: usize, width: usize, height: usize) -> Self {
Room {
x,
y,
x2: x + width,
y2: y + height,
width,
height,
}
}
fn intersects(&self, other: &Self) -> bool {
self.x <= other.x2 && self.x2 >= other.x && self.y <= other.y2 && self.y2 >= other.y
}
}