shellquest/src/screens/game/level/overworld/HouseGenerator.ts

Terminal-based procedurally generated dungeon crawler

import type {PRNG} from 'seedrandom';
import type {LevelTile} from '../types.ts';
import {getTileName} from '../types.ts';

export class HouseGenerator {
  constructor(
    private tiles: LevelTile[][],
    private width: number,
    private height: number,
  ) {}

  generateHouse(
    x: number,
    y: number,
    width: number,
    height: number,
    houseType: 'house-1' | 'house-2',
    rng: PRNG,
  ): void {
    if (x + width > this.width || y + height > this.height) return;

    for (let dy = 0; dy < height; dy++) {
      for (let dx = 0; dx < width; dx++) {
        const tile = this.tiles[y + dy][x + dx];
        tile.bottomTile = 'dirt-1';
        tile.solid = false;
        tile.topTile = undefined;
      }
    }

    for (let dx = 0; dx < width; dx++) {
      if (dx === 0) {
        this.tiles[y][x + dx].topTile = `${houseType}-roof-top-top-left`;
      } else if (dx === width - 1) {
        this.tiles[y][x + dx].topTile = `${houseType}-roof-top-top-right`;
      } else {
        if (rng() < 0.3 && dx > 0 && dx < width - 1) {
          this.tiles[y][x + dx].topTile = `${houseType}-roof-top-chimney`;
        } else {
          this.tiles[y][x + dx].topTile = `${houseType}-roof-top-middle`;
        }
      }
      this.tiles[y][x + dx].solid = true;

      if (y + 1 < this.height) {
        if (dx === 0) {
          this.tiles[y + 1][x + dx].topTile = `${houseType}-roof-bottom-left`;
        } else if (dx === width - 1) {
          this.tiles[y + 1][x + dx].topTile = `${houseType}-roof-bottom-right`;
        } else {
          if (rng() < 0.2 && dx > 0 && dx < width - 1) {
            this.tiles[y + 1][x + dx].topTile = `${houseType}-roof-bottom-arch`;
          } else {
            this.tiles[y + 1][x + dx].topTile = `${houseType}-roof-bottom-middle`;
          }
        }
        this.tiles[y + 1][x + dx].solid = true;
      }
    }

    for (let dy = 2; dy < height; dy++) {
      if (y + dy >= this.height) break;

      for (let dx = 0; dx < width; dx++) {
        if (dx === 0) {
          if (rng() < 0.3 && dy > 2 && dy < height - 1) {
            this.tiles[y + dy][x + dx].topTile = `${houseType}-wall-left`;
          } else {
            this.tiles[y + dy][x + dx].topTile = `${houseType}-wall-left`;
          }
        } else if (dx === width - 1) {
          if (rng() < 0.3 && dy > 2 && dy < height - 1) {
            this.tiles[y + dy][x + dx].topTile = `${houseType}-wall-right`;
          } else {
            this.tiles[y + dy][x + dx].topTile = `${houseType}-wall-right`;
          }
        } else {
          if (dy === height - 1) {
            if (width === 3 && dx === 1) {
              this.tiles[y + dy][x + dx].topTile = `${houseType}-wall-door-single`;
              this.tiles[y + dy][x + dx].solid = false;
            } else if (width >= 4 && dx === Math.floor(width / 2) - 1) {
              this.tiles[y + dy][x + dx].topTile = `${houseType}-wall-door-double-left`;
              this.tiles[y + dy][x + dx].solid = false;
            } else if (width >= 4 && dx === Math.floor(width / 2)) {
              this.tiles[y + dy][x + dx].topTile = `${houseType}-wall-door-double-right`;
              this.tiles[y + dy][x + dx].solid = false;
            } else {
              this.tiles[y + dy][x + dx].topTile = `${houseType}-wall-middle`;
            }
          } else if (dy === height - 2 && rng() < 0.5) {
            if (
              (width === 3 && dx === 1) ||
              (width >= 4 && (dx === Math.floor(width / 2) - 1 || dx === Math.floor(width / 2)))
            ) {
              this.tiles[y + dy][x + dx].topTile = `${houseType}-wall-door-hole`;
            } else {
              if (rng() < 0.3) {
                this.tiles[y + dy][x + dx].topTile = `${houseType}-wall-window`;
              } else {
                this.tiles[y + dy][x + dx].topTile = `${houseType}-wall-middle`;
              }
            }
          } else {
            if (rng() < 0.2 && dy > 2) {
              this.tiles[y + dy][x + dx].topTile = `${houseType}-wall-window`;
            } else {
              this.tiles[y + dy][x + dx].topTile = `${houseType}-wall-middle`;
            }
          }
        }

        const topTileName = this.tiles[y + dy][x + dx].topTile
          ? getTileName(this.tiles[y + dy][x + dx].topTile!)
          : null;
        if (!topTileName?.includes('door')) {
          this.tiles[y + dy][x + dx].solid = true;
        }
      }
    }
  }
}