回答編集履歴
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修正
test
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@@ -100,9 +100,9 @@
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Node currNode = null;
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for (int y = 0; y <
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for (int y = 0; y < h; y++) {
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for (int x = 0; x <
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for (int x = 0; x < w; x++) {
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Node node = nodes [y, x];
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1
サンプルを追加
test
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@@ -1 +1,187 @@
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A*より簡単な[ダイクストラ法](http://www.deqnotes.net/acmicpc/dijkstra/)がおすすめです。
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---
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サンプルを書いてみました。
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ご参考ください。
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```cshapr
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using System.Collections;
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using System.Collections.Generic;
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using UnityEngine;
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public class DijkstraSample : MonoBehaviour {
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class Node {
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public int x;
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public int y;
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public bool wall;
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public int cost;
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public bool done;
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public Node prev;
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public Node(int x, int y, bool wall) {
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this.x = x;
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this.y = y;
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this.wall = wall;
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cost = -1;
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done = false;
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prev = null;
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}
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}
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void Start() {
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int w = 5;
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int h = 5;
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int[,] map = new int[,] {
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{ 0, 1, 0, 0, 0 },
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{ 0, 0, 0, 1, 0 },
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{ 0, 1, 0, 1, 0 },
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{ 0, 1, 0, 1, 0 },
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{ 0, 0, 0, 1, 0 }
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};
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Node[,] nodes = new Node[h, w];
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for (int y = 0; y < h; y++)
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for (int x = 0; x < w; x++)
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nodes [y, x] = new Node (x, y, map [y, x] == 1);
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int sx = 0; // 現在地x。
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int sy = 0; // 現在地y。
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nodes [sy, sx].cost = 0;
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while (true) {
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Node currNode = null;
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for (int y = 0; y < 5; y++) {
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for (int x = 0; x < 5; x++) {
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Node node = nodes [y, x];
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if (node.done || node.cost == -1)
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continue;
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if (currNode == null || node.cost < currNode.cost)
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currNode = node;
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}
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}
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if (currNode == null)
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break;
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currNode.done = true;
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for (int dy = -1; dy <= 1; dy++) {
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for (int dx = -1; dx <= 1; dx++) {
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if (dx == 0 && dy == 0)
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continue;
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int x = currNode.x + dx;
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int y = currNode.y + dy;
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if (x < 0 || y < 0 || x >= w || y >= h)
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continue;
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Node node = nodes [y, x];
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if (node.wall)
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146
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continue;
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int newCost = currNode.cost + 1;
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if (node.cost == -1 || newCost < node.cost) {
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node.cost = newCost;
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node.prev = currNode;
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}
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159
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}
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}
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}
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int gx = 4; // 目的地x。
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int gy = 4; // 目的地y。
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Node tempNode = nodes [gy, gx];
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while (tempNode != null) {
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Debug.Log (string.Format ("x:{0} y:{1}", tempNode.x, tempNode.y));
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tempNode = tempNode.prev;
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}
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}
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}
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187
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```
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