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map.rkt
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#lang typed/racket
(require math/array)
(provide generate-map (struct-out tile) Tile)
(struct tile
([type : Symbol]
[sheet-x : Integer]
[sheet-y : Integer]
[draw-under : Boolean]
[name : String])
#:type-name Tile)
(: land (-> Tile))
(define (land)
(tile 'land 0 0 #f ""))
(: water (-> Tile))
(define (water)
(tile 'water 3 1 #f ""))
(: beach (-> Tile))
(define (beach)
(tile 'beach 3 3 #f ""))
(: mountain (-> Tile))
(define (mountain)
(tile 'mountain (+ 0 (random 2)) (+ 1 (random 2)) #t ""))
(: forest (-> Tile))
(define (forest)
(tile 'forest (+ 1 (random 2)) 0 #t ""))
(: farm (-> Tile))
(define (farm)
(tile 'farm 2 3 #t ""))
(: city (-> String Tile))
(define (city name)
(tile 'city (random 2) 3 #t name))
(: city-name-list (Listof String))
(define city-name-list
(file->lines "resources/city-names.txt"))
(: city-name (-> String))
(define (city-name)
(list-ref city-name-list (random (length city-name-list))))
(: tile-map (-> Integer Integer (Array Tile)))
(define (tile-map m n)
(make-array (vector m n) (water)))
(: init-land-and-water (-> (Array Tile) Integer (Array Tile)))
(define (init-land-and-water tile-map land-mass)
(array-map
(λ: ([x : Tile])
(if (< (random 100) land-mass)
(land)
x))
tile-map))
(: init-mountains (-> (Array Tile) Integer (Array Tile)))
(define (init-mountains tile-map mountain-mass)
(array-map
(λ: ([x : Tile])
(if (equal? (tile-type x) 'land)
(if (< (random 100) mountain-mass)
(mountain)
x)
x))
tile-map))
(: init-forests (-> (Array Tile) Integer (Array Tile)))
(define (init-forests tile-map forest-mass)
(array-map
(λ: ([x : Tile])
(if (equal? (tile-type x) 'land)
(if (< (random 100) forest-mass)
(forest)
x)
x))
tile-map))
(: init-beaches (-> (Array Tile) Integer (Array Tile)))
(define (init-beaches tile-map beach-mass)
(array-map
(λ: ([js : (Vectorof Index)])
(let ([s : Tile (array-ref tile-map js)])
(cond
[(and (equal? (tile-type s) 'water)
(< (random 100) beach-mass)
(> (count-tiles tile-map 'land (vector-ref js 0) (vector-ref js 1)) 0))
(beach)]
[else s])))
(indexes-array (array-shape tile-map))))
(: init-cities (-> (Array Tile) Integer (Array Tile)))
(define (init-cities tile-map city-mass)
(array-map
(λ: ([x : Tile])
(if (equal? (tile-type x) 'land)
(if (< (random 100) city-mass)
(city (city-name))
x)
x))
tile-map))
(: count-tiles (-> (Array Tile) Symbol Integer Integer Integer))
(define (count-tiles tile-map tile x y)
(array-count
(λ: ([s : Tile])
(equal? (tile-type s) tile))
(let ([h : Integer (- (vector-ref (array-shape tile-map) 1) 1)]
[w : Integer (- (vector-ref (array-shape tile-map) 0) 1)])
(array-indexes-ref
tile-map
(array #[(vector (min (+ x 1) w) y)
(vector x (min (+ y 1) h))
(vector (max (- x 1) 0) y)
(vector x (max (- y 1) 0))
(vector (min (+ x 1) w) (min (+ y 1) h))
(vector (max (- x 1) 0) (max (- y 1) 0))
(vector (max (- x 1) 0) (min (+ y 1) h))
(vector (min (+ x 1) w) (max (- y 1) 0))])))))
(: land-step (-> (Array Tile) (Array Tile)))
(define (land-step tile-map)
(array-map
(λ: ([js : (Vectorof Index)])
(let ([s : Tile (array-ref tile-map js)])
(cond
[(and (equal? (tile-type s) 'land)
(< (count-tiles tile-map 'land (vector-ref js 0) (vector-ref js 1)) 2))
(water)]
[(and (equal? (tile-type s) 'land)
(< (count-tiles tile-map 'land (vector-ref js 0) (vector-ref js 1)) 5))
s]
[(equal? (tile-type s) 'land) (water)]
[(equal? (tile-type s) 'water) (if (< (count-tiles tile-map 'land (vector-ref js 0) (vector-ref js 1)) 5) (land) s)]
[else s])))
(indexes-array (array-shape tile-map))))
(: mountain-step (-> (Array Tile) (Array Tile)))
(define (mountain-step tile-map)
(array-map
(λ: ([js : (Vectorof Index)])
(let ([s : Tile (array-ref tile-map js)])
(cond
[(and (equal? (tile-type s) 'mountain)
(< (count-tiles tile-map 'mountain (vector-ref js 0) (vector-ref js 1)) 2))
(land)]
[(equal? (tile-type s) 'land) (if (> (count-tiles tile-map 'mountain (vector-ref js 0) (vector-ref js 1)) 4) (mountain) s)]
[else s])))
(indexes-array (array-shape tile-map))))
(: forest-step (-> (Array Tile) (Array Tile)))
(define (forest-step tile-map)
(array-map
(λ: ([js : (Vectorof Index)])
(let ([s : Tile (array-ref tile-map js)])
(cond
[(and (equal? (tile-type s) 'forest)
(< (count-tiles tile-map 'forest (vector-ref js 0) (vector-ref js 1)) 2))
(land)]
[(equal? (tile-type s) 'land) (if (> (count-tiles tile-map 'forest (vector-ref js 0) (vector-ref js 1)) 4) (forest) s)]
[else s])))
(indexes-array (array-shape tile-map))))
(: farm-step (-> (Array Tile) (Array Tile)))
(define (farm-step tile-map)
(array-map
(λ: ([js : (Vectorof Index)])
(let ([s : Tile (array-ref tile-map js)])
(cond
[(and (equal? (tile-type s) 'farm)
(< (count-tiles tile-map 'city (vector-ref js 0) (vector-ref js 1)) 1)
(< (count-tiles tile-map 'farm (vector-ref js 0) (vector-ref js 1)) 3))
(land)]
[(and (equal? (tile-type s) 'land)
(> (count-tiles tile-map 'city (vector-ref js 0) (vector-ref js 1)) 0))
(farm)]
[(equal? (tile-type s) 'land) (if (> (count-tiles tile-map 'farm (vector-ref js 0) (vector-ref js 1)) 6) (farm) s)]
[else s])))
(indexes-array (array-shape tile-map))))
(: generate-land (-> (Array Tile) Integer Integer (Array Tile)))
(define (generate-land tile-map land-mass iter)
(let ([tm : (Array Tile) (init-land-and-water tile-map land-mass)])
(for ([i iter])
(set! tm (land-step tm)))
tm))
(: generate-mountains (-> (Array Tile) Integer Integer (Array Tile)))
(define (generate-mountains tile-map mountain-mass iter)
(let ([tm : (Array Tile) (init-mountains tile-map mountain-mass)])
(for ([i iter])
(set! tm (mountain-step tm)))
tm))
(: generate-forests (-> (Array Tile) Integer Integer (Array Tile)))
(define (generate-forests tile-map forest-mass iter)
(let ([tm : (Array Tile) (init-forests tile-map forest-mass)])
(for ([i iter])
(set! tm (forest-step tm)))
tm))
(: generate-cities (-> (Array Tile) Integer Integer (Array Tile)))
(define (generate-cities tile-map city-mass iter)
(let ([tm : (Array Tile) (init-cities tile-map city-mass)])
(for ([i iter])
(set! tm (farm-step tm)))
tm))
(: generate-map (-> Integer Integer Integer Integer Integer Integer Integer Integer (Array Tile)))
(define (generate-map map-height map-width iter land-mass mountain-mass forest-mass beach-mass city-mass)
(generate-cities (generate-forests (generate-mountains (init-beaches (generate-land (tile-map map-height map-width) land-mass iter) beach-mass) mountain-mass iter) forest-mass iter) city-mass iter))