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minimal spanning tree implemented

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no disconnected rooms
This commit is contained in:
Joachim Lusiardi
2023-11-19 09:59:19 +01:00
parent b4122d321b
commit 91160edb3f
3 changed files with 144 additions and 56 deletions
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164
src/level_generator.rs
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@@ -1,5 +1,10 @@
use rand::prelude::SliceRandom;
use rand::Rng;
use petgraph::graph::UnGraph;
use petgraph::graph::Graph;
use petgraph::data::*;
use petgraph::algo::min_spanning_tree;
use rand::rngs::ThreadRng;
use crate::level::{Level, LevelElement, RoomType};
@@ -15,9 +20,9 @@ struct Room {
pub offset_y: usize,
pub width: usize,
pub height: usize,
pub connection_down: bool,
pub connection_right: bool,
pub connected: bool,
// pub connection_down: bool,
// pub connection_right: bool,
// pub connected: bool,
}
impl Room {
@@ -28,11 +33,20 @@ impl Room {
offset_y: 0,
width: 0,
height: 0,
connection_down: false,
connection_right: false,
connected: false,
// connection_down: false,
// connection_right: false,
// connected: false,
}
}
/// change the size and position of a room randomly within its bounds
fn random(&mut self, rng: &mut ThreadRng) {
let width = rng.gen_range(3..6);
let height = rng.gen_range(3..5);
self.width = width;
self.height = height;
self.offset_x = rng.gen_range(0..(ROOM_WIDTH - width));
self.offset_y = rng.gen_range(0..(ROOM_HEIGHT - height));
}
}
#[derive(Debug)]
@@ -42,74 +56,114 @@ pub struct LevelGenerator {
impl LevelGenerator {
pub fn generate(level: usize) -> Self {
let mut room_types: Vec<RoomType> = Vec::with_capacity(ROOMS_HORIZONTAL * ROOMS_VERTICAL);
if level > 0 {
room_types.push(RoomType::StairUp);
} else {
room_types.push(RoomType::Start);
}
if level < 24 {
room_types.push(RoomType::StairDown);
} else {
room_types.push(RoomType::End);
}
let mut rng = rand::thread_rng();
for _ in room_types.len()..ROOMS_HORIZONTAL * ROOMS_VERTICAL {
match rng.gen_range(1..=6) {
1..=3 => { room_types.push(RoomType::EmptyRoom) }
_ => { room_types.push(RoomType::BasicRoom) }
}
}
room_types.shuffle(&mut rng);
let mut rooms = [[Room::new(); ROOMS_HORIZONTAL]; ROOMS_VERTICAL];
for r in 0..ROOMS_VERTICAL {
for c in 0..ROOMS_HORIZONTAL {
rooms[r][c].kind = room_types.pop().unwrap();
if rooms[r][c].kind != RoomType::EmptyRoom {
let width = rng.gen_range(3..6);
let height = rng.gen_range(3..5);
rooms[r][c].width = width;
rooms[r][c].height = height;
rooms[r][c].offset_x = rng.gen_range(0..(ROOM_WIDTH - width));
rooms[r][c].offset_y = rng.gen_range(0..(ROOM_HEIGHT - height));
let mut graph = UnGraph::<(usize, usize), u16>::default();
// trick the room_connectable function into failing on the first iteration
rooms[0][0].kind = RoomType::BasicRoom;
while !LevelGenerator::rooms_connectable(&rooms) {
let mut room_types: Vec<RoomType> = Vec::with_capacity(ROOMS_HORIZONTAL * ROOMS_VERTICAL);
// level 0 contains a start room, all others contain a stair up
if level == 0 {
room_types.push(RoomType::Start);
} else {
room_types.push(RoomType::StairUp);
}
// level 24 (the last) contains an end room, all others a stair down
if level == 24 {
room_types.push(RoomType::End);
} else {
room_types.push(RoomType::StairDown);
}
// generate a random set of rooms and shuffle them
for _ in room_types.len()..ROOMS_HORIZONTAL * ROOMS_VERTICAL {
match rng.gen_range(1..=6) {
// TODO tune room type distribution
1..=3 => { room_types.push(RoomType::EmptyRoom) }
_ => { room_types.push(RoomType::BasicRoom) }
}
if r == ROOMS_HORIZONTAL - 1 || c == ROOMS_HORIZONTAL - 1 {
continue;
}
match rng.gen_range(0..3) {
0 => { rooms[r][c].connection_down = true }
1 => { rooms[r][c].connection_right = true }
2 => {
rooms[r][c].connection_down = true;
rooms[r][c].connection_down = true
}
room_types.shuffle(&mut rng);
graph.clear();
// place the rooms in the array an add nodes to the graph for every non empty room
for c in 0..ROOMS_VERTICAL {
for r in 0..ROOMS_HORIZONTAL {
rooms[c][r].kind = room_types.pop().unwrap();
if rooms[c][r].kind != RoomType::EmptyRoom {
rooms[c][r].random(&mut rng);
graph.add_node((c, r));
}
_ => {}
}
}
}
let mut unconnected_rooms = 0;//ROOMS_HORIZONTAL * ROOMS_VERTICAL - 1;
rooms[0][0].connected = true;
for r in 0..ROOMS_VERTICAL {
for c in 0..ROOMS_HORIZONTAL {
if !rooms[r][c].connected {
// add edges to the graph connecting each room to all of its neighbours (max 4 of them)
for c in 0..ROOMS_VERTICAL {
for r in 0..ROOMS_HORIZONTAL {
if rooms[c][r].kind == RoomType::EmptyRoom {
continue;
}
if rooms[r][c].connection_right {
rooms[r][c + 1].connected = true;
let src_index = graph.node_indices().find(|i| graph[*i] == (c, r)).unwrap();
for r_1 in r + 1..ROOMS_HORIZONTAL {
if rooms[c][r_1].kind != RoomType::EmptyRoom {
let tgt_index = graph.node_indices().find(|i| graph[*i] == (c, r_1)).unwrap();
// todo use random weight for edge
graph.add_edge(src_index, tgt_index, 1);
break;
}
}
if rooms[r][c].connection_down {
rooms[r + 1][c].connected = true;
for c_1 in c + 1..ROOMS_VERTICAL {
if rooms[c_1][r].kind != RoomType::EmptyRoom {
let tgt_index = graph.node_indices().find(|i| graph[*i] == (c_1, r)).unwrap();
// todo use random weight for edge
graph.add_edge(src_index, tgt_index, 1);
break;
}
}
}
}
println!("Unconnected: {}", unconnected_rooms);
// calculate a minimum spanning tree
let mst: Graph<(usize, usize), u16, petgraph::Undirected> = Graph::from_elements(min_spanning_tree(&graph));
for edge in mst.raw_edges() {
let src = mst[edge.source()];
let tgt = mst[edge.target()];
println!("{:?} {:?}", src, tgt);
}
// println!("Level {}\n{}", level, Dot::new(&mst));
LevelGenerator {
rooms
}
}
/// Verifies that for a given matrix of rooms each room has at least one other room in the
/// same row or column.
fn rooms_connectable(rooms: &[[Room; ROOMS_HORIZONTAL]; ROOMS_VERTICAL]) -> bool {
for c in 0..ROOMS_VERTICAL {
for r in 0..ROOMS_HORIZONTAL {
if rooms[c][r].kind != RoomType::EmptyRoom {
let mut connected = 0;
for c1 in 0..ROOMS_VERTICAL {
if rooms[c1][r].kind != RoomType::EmptyRoom {
connected += 1;
}
}
for r1 in 0..ROOMS_HORIZONTAL {
if rooms[c][r1].kind != RoomType::EmptyRoom {
connected += 1;
}
}
if connected <= 2 {
return false;
}
}
}
}
return true;
}
pub fn render(&self) -> Level {
let mut rng = rand::thread_rng();
let mut s = [[LevelElement::Wall; 1 + ROOMS_HORIZONTAL * ROOM_HEIGHT]; 1 + ROOMS_VERTICAL * ROOM_WIDTH];