Files
gitea-docker/desktop/src-common/advent/pathfind.clj
2014-09-02 22:52:29 -07:00

81 lines
3.2 KiB
Clojure

(ns advent.pathfind
(:require [play-clj.core :refer :all]
[play-clj.ui :refer :all]
[play-clj.utils :refer :all]
[play-clj.g2d :refer :all]
[clojure.pprint])
(:import [com.badlogic.gdx.files FileHandle]
[com.badlogic.gdx Files]
[com.badlogic.gdx.graphics Camera Color GL20 OrthographicCamera
PerspectiveCamera Pixmap Pixmap$Format PixmapIO Texture
VertexAttributes$Usage]))
(defn printmap [my-map & [skip]]
(let [skip (or skip 1)]
(doseq [row (take-nth skip my-map)]
(println (take-nth skip (map {0 \space 1 "W" "X" "X" "." "."} row))))))
(defn random-map [] (-> (vec (take (/ 240 2) (repeatedly (fn [] (vec (take (/ 320 2) (repeatedly (fn [] (rand-nth [0 0 1 ])))))))))
(update-in [1 1] (constantly 0))
(update-in [50 50] (constantly 0))))
(defn neighbors [x y my-map]
(let [candidates [[(dec x) (dec y)] [x (dec y)] [(inc x) (dec y)]
[(dec x) y] [(inc x) y]
[(dec x) (inc y)] [x (inc y)] [(inc x) (inc y)]]]
(remove #(= 1 (get-in my-map (reverse %)))
(filter (fn [[x y]] (and (< -1 x (count (first my-map)))
(< -1 y (count my-map)))) candidates))))
(defn resolve [came-from play-loc target-loc]
(loop [path []
current-node target-loc]
(if (or (= current-node play-loc)
(nil? current-node))
(reverse (conj path current-node))
(recur
(conj path current-node)
(came-from current-node)))))
(defn visit-all [my-map play-loc target-loc ]
(if (= 1 (get-in my-map (reverse target-loc)))
nil
(loop [came-from {}
fronteir [play-loc]]
(let [[current-x current-y] (first fronteir)]
(if (or (empty? fronteir)
(= [current-x current-y] target-loc))
(if (nil? (came-from target-loc))
nil
(resolve came-from play-loc target-loc))
(let [neighbors (neighbors current-x current-y my-map)
[came-from fronteir] (reduce (fn [[came-from fronteir] neighbor]
(if (came-from neighbor)
[came-from (vec fronteir)]
[(assoc came-from neighbor [current-x current-y])
(vec (conj fronteir neighbor))]))
[came-from fronteir]
neighbors)]
(recur came-from (vec (rest fronteir)))))))))
(defn print-resolved [path my-map]
(doseq [row (reduce (fn [acc path]
(if path
(update-in acc (reverse path) (constantly "X"))
acc))
my-map
path)]
(println (map {0 \space 1 "W" "X" "X"} row)))
nil)
(defn map-from-resource [filename]
(let [pm (pixmap filename)]
(vec (for [y (reverse (range (pixmap! pm :get-height)))]
(vec (for [x (range (pixmap! pm :get-width))]
(if (color! (color (pixmap! pm :get-pixel x y)) :equals (color 0 0 0 255))
1 0)))))))