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#include "map.hpp"
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#include "dbc.hpp"
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#include <vector>
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#include <fmt/core.h>
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#include <random>
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#include <utility>
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std::random_device g_rng;
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std::mt19937 g_generator(g_rng());
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using std::vector, std::pair;
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using namespace fmt;
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void dump_map(const std::string &msg, Matrix &map) {
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println("----------------- {}", msg);
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for(auto row : map) {
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for(auto col : row) {
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print("{} ", col);
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}
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print("\n");
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}
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}
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inline void add_neighbors(PairList &neighbors, Matrix &closed, size_t j, size_t i) {
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size_t h = closed.size();
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size_t w = closed[0].size();
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vector<size_t> rows{j - 1, j, j + 1};
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vector<size_t> cols{i - 1, i, i + 1};
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for(auto row : rows) {
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for(auto col : cols) {
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if((0 <= row && row < h) &&
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(0 <= col && col < w) &&
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closed[row][col] == 0)
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{
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closed[row][col] = 1;
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neighbors.push_back({.j=row, .i=col});
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}
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}
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}
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}
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Map::Map(size_t width, size_t height) : m_limit(1000) {
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m_walls = Matrix(height, MatrixRow(width, 0));
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m_input_map = Matrix(height, MatrixRow(width, 1));
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}
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void Map::make_paths() {
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size_t h = m_input_map.size();
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size_t w = m_input_map[0].size();
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// Initialize the new array with every pixel at limit distance
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// NOTE: this is normally ones() * limit
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int limit = m_limit == 0 ? h * w : m_limit;
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Matrix new_arr = Matrix(h, MatrixRow(w, limit));
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Matrix closed = m_walls;
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PairList starting_pixels;
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PairList open_pixels;
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// First pass: Add starting pixels and put them in closed
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for(size_t counter = 0; counter < h * w; counter++) {
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size_t i = counter % w;
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size_t j = counter / w;
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if(m_input_map[j][i] == 0) {
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new_arr[j][i] = 0;
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closed[j][i] = 1;
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starting_pixels.push_back({.j=j,.i=i});
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}
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}
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// Second pass: Add border to open
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for(auto sp : starting_pixels) {
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add_neighbors(open_pixels, closed, sp.j, sp.i);
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}
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// Third pass: Iterate filling in the open list
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int counter = 1; // leave this here so it's available below
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for(; counter < limit && !open_pixels.empty(); ++counter) {
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PairList next_open;
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for(auto sp : open_pixels) {
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new_arr[sp.j][sp.i] = counter;
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add_neighbors(next_open, closed, sp.j, sp.i);
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}
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open_pixels = next_open;
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}
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// Last pass: flood last pixels
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for(auto sp : open_pixels) {
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new_arr[sp.j][sp.i] = counter;
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}
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m_paths = new_arr;
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}
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void Map::make_room(size_t origin_x, size_t origin_y, size_t w, size_t h) {
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dbc::pre("x out of bounds", origin_x < width());
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dbc::pre("y out of bounds", origin_y < height());
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dbc::pre("w out of bounds", w <= width());
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dbc::pre("h out of bounds", h <= height());
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for(size_t y = origin_y; y < origin_y + h; ++y) {
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dbc::check(y < m_walls.size(), "y is out of bounds");
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for(size_t x = origin_x; x < origin_x + w; ++x) {
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dbc::check(x < m_walls[y].size(), "x is out of bounds");
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m_walls[y][x] = 1;
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}
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}
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}
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inline int make_split(Room &cur, bool horiz) {
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println("MAKE SPLIT horiz={}, y={}, w={}, h={}", horiz,
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cur.y, cur.width, cur.height);
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size_t dimension = horiz ? cur.height : cur.width;
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int min = dimension / 4;
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int max = dimension - min;
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println("dimension={}, min={}, max={}", dimension, min, max);
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std::uniform_int_distribution<int> rand_dim(min, max);
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return rand_dim(g_generator);
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}
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void Map::partition_map(Room &cur, int depth) {
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if(cur.width >= 5 && cur.width <= 10 &&
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cur.height >= 5 && cur.height <= 10) {
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m_rooms.push_back(cur);
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return;
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}
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std::uniform_int_distribution<int> rsplit(0, 1);
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bool horiz = cur.width > cur.height ? false : true;
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int split = make_split(cur, horiz);
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Room left = cur;
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Room right = cur;
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if(horiz) {
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dbc::check(split > 0, "split is not > 0");
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dbc::check(split < int(cur.height), "split is too big!");
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left.height = size_t(split - 1);
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right.y = cur.y + split;
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right.height = size_t(cur.height - split);
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} else {
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dbc::check(split > 0, "split is not > 0");
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dbc::check(split < int(cur.width), "split is too big!");
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left.width = size_t(split-1);
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right.x = cur.x + split,
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right.width = size_t(cur.width - split);
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}
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if(depth > 0 && left.width > 5 && left.height > 5) {
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partition_map(left, depth-1);
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}
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if(depth > 0 && right.width > 5 && right.height > 5) {
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partition_map(right, depth-1);
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}
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}
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void Map::place_rooms(Room &cur) {
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for(auto &cur : m_rooms) {
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make_room(cur.x+1, cur.y+1, cur.width-2, cur.height-2);
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cur.door_x = cur.x+1;
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cur.door_y = cur.y;
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m_input_map[cur.door_y][cur.door_x] = 0;
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}
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}
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void Map::generate() {
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Room root{
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.x = 0,
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.y = 0,
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.width = width(),
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.height = height()
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};
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partition_map(root, 10);
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place_rooms(root);
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make_paths();
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Room &room0 = m_rooms[0];
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Room &room1 = m_rooms[1];
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int cur = m_paths[room0.door_y][room0.door_x];
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int next = m_paths[room0.door_y][room0.door_x+1];
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int i = 1;
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while(next >= cur) {
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cur = next;
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next = m_paths[room0.door_y][room0.door_x+i];
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++i;
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println("door_y: {}, door_x: {}, CUR: {}, NEXT: {}", room0.door_y, room0.door_x, cur, next);
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}
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}
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void Map::dump() {
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dump_map("PATHS", m_paths);
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dump_map("WALLS", m_walls);
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dump_map("INPUT", m_input_map);
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}
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