116 lines
4.9 KiB
Clojure
116 lines
4.9 KiB
Clojure
(ns advent.pathfind
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(:require [play-clj.core :refer :all]
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[play-clj.ui :refer :all]
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[play-clj.utils :refer :all]
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[play-clj.g2d :refer :all]
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[clojure.pprint]
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[clojure.data.priority-map :refer [priority-map]])
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(:import [com.badlogic.gdx.files FileHandle]
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[com.badlogic.gdx Files]
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[java.lang Math]
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[com.badlogic.gdx.graphics Camera Color GL20 OrthographicCamera
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PerspectiveCamera Pixmap Pixmap$Format PixmapIO Texture
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VertexAttributes$Usage]))
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(defn printmap [my-map & [skip]]
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(let [skip (or skip 1)]
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(doseq [row (take-nth skip my-map)]
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(println (take-nth skip (map {1 \space 0 "W" "X" "X" "." "."} row))))))
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(defn random-map [] (-> (vec (take (/ 240 4) (repeatedly (fn [] (vec (take (/ 320 4) (repeatedly (fn [] (rand-nth [1 1 1 5 5 0])))))))))
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(update-in [1 1] (constantly 1))
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(update-in [50 50] (constantly 1))))
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(defn neighbors [[^long x ^long y] my-map]
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(let [candidates [[^long (dec x) ^long (dec y)] [x ^long (dec y)] [^long (inc x) ^long (dec y)]
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[^long (dec x) y] [^long (inc x) y]
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[^long (dec x) ^long (inc y)] [x ^long (inc y)] [^long (inc x) ^long (inc y)]]
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width (count (first my-map))
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height (count my-map)]
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(vec (remove #(= 0 (get-in my-map (reverse %)))
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(filter (fn [[x y]] (and (< -1 x width)
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(< -1 y height))) candidates)))))
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(defn resolve-path [came-from play-loc target-loc]
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(let [came-from (into {} came-from)]
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(if (nil? (came-from target-loc))
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nil
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(loop [path []
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current-node (vec target-loc)]
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(if (or (= current-node play-loc)
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(nil? current-node))
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(reverse (map (fn [[x y]] [x y]) (conj path current-node)))
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(recur
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(conj path current-node)
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(came-from (vec current-node))))))))
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(def d2 ^double (- (Math/sqrt 2) 1))
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(defn heuristic [^long goal-x ^long goal-y ^long current-x ^long current-y]
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(let [dist-x ^long (if (< goal-x current-x)
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^long (- current-x goal-x)
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^long (- goal-x current-x ))
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dist-y ^long (if (< goal-y current-y)
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^long (- current-y goal-y)
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^long (- goal-y current-y))]
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^long (+ dist-x dist-y (* ^double d2
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^long (min dist-x dist-y)))))
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(defn visit-all [my-map play-loc target-loc]
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(let [play-loc (vec play-loc)
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target-log (vec target-loc)]
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(if (= 0 (get-in my-map (reverse target-loc)))
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nil
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(let [cost-so-far ^java.util.HashMap (java.util.HashMap. {play-loc 0})
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came-from ^java.util.HashMap (java.util.HashMap.)
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fronteir ^java.util.PriorityQueue (java.util.PriorityQueue. 100 (comparator (fn [a b] (< (:cost a) (:cost b)))))]
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(.offer fronteir {:cost 0 :loc play-loc})
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(loop [current-loc (.poll fronteir)]
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(if (or (nil? current-loc)
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(= (:loc current-loc) target-loc))
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(resolve-path came-from play-loc target-loc)
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(do (doseq [neighbor (neighbors (:loc current-loc) my-map)]
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(let [cost-for-neighbor (.get cost-so-far neighbor)
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new-cost (+ (.get cost-so-far (:loc current-loc)) (get-in my-map (reverse neighbor)))]
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(when (or (nil? cost-for-neighbor)
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(< new-cost cost-for-neighbor))
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(.put came-from (vec neighbor) (vec (:loc current-loc)))
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(.put cost-so-far (vec neighbor) new-cost)
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(.offer fronteir {:cost (+ new-cost (heuristic (first target-loc) (second target-loc) (first neighbor) (second neighbor)))
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:loc neighbor}))))
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(recur (.poll fronteir)))))))))
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(defn print-resolved [path my-map]
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(doseq [row (reduce (fn [acc path]
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(if path
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(update-in acc (reverse path) (constantly "X"))
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acc))
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my-map
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path)]
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(println (map {1 \space 5 "." 0 "W" "X" "X"} row)))
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nil)
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(defn test-pathfind []
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(let [my-map (random-map)
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path (visit-all my-map [1 1] [50 50])]
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(println "Test")
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(print-resolved path my-map)
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(println path)))
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(defn map-from-resource [filename]
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(let [pm (pixmap filename)
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black (color 0 0 0 255)
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painful (color 255 0 0 255)]
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(vec (for [y (reverse (range (pixmap! pm :get-height)))]
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(vec (for [x (range (pixmap! pm :get-width))
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:let [current-color (color (pixmap! pm :get-pixel x y))]]
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(cond
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(color! current-color :equals black) 0
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(color! current-color :equals painful) 10
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:else 1)))))))
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