81 lines
3.2 KiB
Clojure
81 lines
3.2 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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(:import [com.badlogic.gdx.files FileHandle]
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[com.badlogic.gdx Files]
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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 {0 \space 1 "W" "X" "X" "." "."} row))))))
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(defn random-map [] (-> (vec (take (/ 240 2) (repeatedly (fn [] (vec (take (/ 320 2) (repeatedly (fn [] (rand-nth [0 0 1 ])))))))))
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(update-in [1 1] (constantly 0))
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(update-in [50 50] (constantly 0))))
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(defn neighbors [x y my-map]
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(let [candidates [[(dec x) (dec y)] [x (dec y)] [(inc x) (dec y)]
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[(dec x) y] [(inc x) y]
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[(dec x) (inc y)] [x (inc y)] [(inc x) (inc y)]]]
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(remove #(= 1 (get-in my-map (reverse %)))
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(filter (fn [[x y]] (and (< -1 x (count (first my-map)))
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(< -1 y (count my-map)))) candidates))))
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(defn resolve [came-from play-loc target-loc]
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(loop [path []
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current-node target-loc]
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(if (or (= current-node play-loc)
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(nil? current-node))
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(reverse (conj path current-node))
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(recur
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(conj path current-node)
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(came-from current-node)))))
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(defn visit-all [my-map play-loc target-loc ]
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(if (= 1 (get-in my-map (reverse target-loc)))
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nil
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(loop [came-from {}
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fronteir [play-loc]]
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(let [[current-x current-y] (first fronteir)]
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(if (or (empty? fronteir)
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(= [current-x current-y] target-loc))
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(if (nil? (came-from target-loc))
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nil
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(resolve came-from play-loc target-loc))
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(let [neighbors (neighbors current-x current-y my-map)
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[came-from fronteir] (reduce (fn [[came-from fronteir] neighbor]
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(if (came-from neighbor)
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[came-from (vec fronteir)]
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[(assoc came-from neighbor [current-x current-y])
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(vec (conj fronteir neighbor))]))
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[came-from fronteir]
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neighbors)]
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(recur came-from (vec (rest 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 {0 \space 1 "W" "X" "X"} row)))
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nil)
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(defn map-from-resource [filename]
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(let [pm (pixmap filename)]
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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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(if (color! (color (pixmap! pm :get-pixel x y)) :equals (color 0 0 0 255))
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1 0)))))))
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