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pathfinding works.

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2014-09-02 22:52:29 -07:00
parent 049cc6b059
commit a79651ed04
4 changed files with 98 additions and 12 deletions
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desktop/resources/pathfind-test-big.png Normal file
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30
desktop/src-common/advent/core.clj
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@@ -3,7 +3,8 @@
[play-clj.ui :refer :all]
[play-clj.utils :refer :all]
[play-clj.g2d :refer :all]
[clojure.pprint])
[clojure.pprint]
[advent.pathfind])
(:import [com.badlogic.gdx.graphics Pixmap Pixmap$Filter]))
(def scale 4)
@@ -32,7 +33,10 @@
(defn left-click [screen entities]
(let [{:keys [x y]} (input->screen screen {:x (:input-x screen) :y (:input-y screen)})]
(assoc-in entities [:ego :target] {:x x :y y})))
(assoc-in entities [:ego :target-path] (take-nth 10 (advent.pathfind/visit-all
(:collision (:background entities))
[(int (:x (:ego entities))) (int (:y (:ego entities)))]
[(int x) (int y)])))))
(defn get-ego [screen]
(let [player-sheet (texture! (texture "player.png") :split 18 36)
@@ -42,27 +46,29 @@
(texture (aget player-sheet 1 i))))
:anim (animation 0.075 (for [i (range 8)]
(texture (aget player-sheet 0 i))))
:x 100 :y 75 :x-velocity 1
:x 150 :y 95 :x-velocity 1
:id "ego"}]
(merge (animation->texture screen (:anim ego)) ego)))
(defn update-ego [screen entities ego]
(let [ego (merge ego (animation->texture screen (:anim ego)))
target (:target ego)]
(if target
(let [delta-x (- (:x target) (:x ego))
target-path (:target-path ego)
[target-x target-y] (first target-path)
target {:x target-x :y target-y}]
(if (and target (seq target-path))
(let [
delta-x (- (:x target) (:x ego))
delta-y (- (:y target) (:y ego))
mag (Math/sqrt (+ (* delta-x delta-x) (* delta-y delta-y)))
vector-x (* 2 (/ delta-x mag))
vector-y (* 2 (/ delta-y mag))]
vector-x (* 1.5 (/ delta-x mag))
vector-y (* 1.5 (/ delta-y mag))]
(if (< mag 1)
(dissoc ego :target)
(update-in ego [:target-path] rest)
(-> ego
(update-in [:x] #(+ % vector-x))
(update-in [:y] #(+ % vector-y)))))
ego)))
(dissoc ego :target-path))))
(defscreen main-screen
:on-show
(fn [screen entities]
@@ -71,7 +77,7 @@
_ (input! :set-cursor-image (cursor "cursor.png" 0) 0 0)
background (texture "bg5.png")]
{:cursor {:id "cursor" :cursor-index 0}
:background (assoc background :origin-y 0 :origin-x 0 :id "background" :x 0 :y 0 :scale-x 1 :scale-y 1)
:background (assoc background :origin-y 0 :origin-x 0 :id "background" :x 0 :y 0 :scale-x 1 :scale-y 1 :collision (advent.pathfind/map-from-resource "pathfind-test-big.png"))
:ego (get-ego screen)}))
:on-render

80
desktop/src-common/advent/pathfind.clj Normal file
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@@ -0,0 +1,80 @@
(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)))))))