149 lines
4.6 KiB
C#
149 lines
4.6 KiB
C#
using System.Collections;
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using System.Collections.Generic;
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using System.Text;
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using UnityEngine;
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using static Gameplay.Map;
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namespace Gameplay
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{
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public static class PathFinder
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{
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public static List<int> FindPath(Map map,
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int from,
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int to,
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int moveLevel)
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{
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var result = new List<int>();
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if (from == to)
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{
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// 同一个格子
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result.Add(to);
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return result;
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}
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var canReach = true;
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var mapData = map.GetBlockData(to);
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if (mapData == null)
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{
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canReach = false;
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return result;
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}
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if (!MapUtils.CanPass(moveLevel, mapData.GetTerrainTypeProperty()))
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{
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// 如果终点不可通行,直接走无法走通的逻辑
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canReach = false;
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}
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var toData = default(RuntimeBlockProperty);
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var oldCrossLevelTo = 0;
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// 将自己所在点和目标所在点临时设置为可通行
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map.GetRuntimeBlockProperty(from, out RuntimeBlockProperty fromData);
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var oldCrossLevelFrom = fromData.crossLevel;
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MapUtils.ForceSetCanCross(true, ref fromData);
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map.SetRuntimeBlockProperty(from, fromData);
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if (canReach)
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{
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map.GetRuntimeBlockProperty(to, out toData);
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oldCrossLevelTo = toData.crossLevel;
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MapUtils.ForceSetCanCross(true, ref toData);
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map.SetRuntimeBlockProperty(to, toData);
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result = map.TerrainGridSystem.FindPath(from, to, moveLevel);
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}
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// 无法直接走通
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if (!_IsFathExist(result))
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{
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var cacheFrom = from;
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var deepSearch = _ProcessCannotFindPath(map, cacheFrom, to, result);
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while (deepSearch)
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{
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cacheFrom = result[^1];
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deepSearch = _ProcessCannotFindPath(map, cacheFrom, to, result);
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}
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}
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fromData.crossLevel = oldCrossLevelFrom;
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map.SetRuntimeBlockProperty(from, fromData);
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if (canReach)
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{
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// 再设置回去
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toData.crossLevel = oldCrossLevelTo;
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map.SetRuntimeBlockProperty(to, toData);
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}
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if (result.Count == 1 && !MapUtils.CanPass(moveLevel, toData))
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{
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// 只有一格 且下一格子不可通行,则无法到达
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result.Clear();
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}
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if (DebugUtil.LogEnable)
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{
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var stringBuilder = new StringBuilder();
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stringBuilder.Append("FindPath: ");
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stringBuilder.Append(from);
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stringBuilder.Append(" -> ");
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stringBuilder.Append(to);
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stringBuilder.Append(" : ");
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for (int i = 0; i < result.Count; i++)
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{
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stringBuilder.Append(result[i]);
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stringBuilder.Append(" ");
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}
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DebugUtil.Log(stringBuilder);
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}
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return result;
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}
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private static bool _ProcessCannotFindPath(Map map,
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int from,
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int to,
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ICollection<int> pathList)
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{
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// 无法到达
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// 获得附近一圈的格子
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var nearByCells = map.TerrainGridSystem.CellGetNeighboursWithinRange(from, 1, 1);
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if (nearByCells == null || nearByCells.Count <= 0) return false;
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// 取最近的格子
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int closestCell = -1;
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var selfPos = map.TGSCellIndex2WorldPosition(from);
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var targetPos = map.TGSCellIndex2WorldPosition(to);
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var minDistance = Vector3.Distance(selfPos, targetPos);
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for (int i = 0; i < nearByCells.Count; i++)
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{
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var cellIndex = nearByCells[i];
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var newPos = map.TGSCellIndex2WorldPosition(cellIndex);
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var distance = Vector3.Distance(targetPos, newPos);
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if (distance < minDistance)
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{
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minDistance = distance;
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closestCell = cellIndex;
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}
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}
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if (closestCell != -1)
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{
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pathList.Add(closestCell);
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return true;
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}
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return false;
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}
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private static bool _IsFathExist(ICollection pathList)
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{
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return !(pathList == null || pathList.Count <= 0);
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}
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}
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}
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