77 lines
2.2 KiB
C#
77 lines
2.2 KiB
C#
#region Copyright & License Information
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/*
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* Copyright 2007-2022 The OpenRA Developers (see AUTHORS)
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* This file is part of OpenRA, which is free software. It is made
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* available to you under the terms of the GNU General Public License
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* as published by the Free Software Foundation, either version 3 of
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* the License, or (at your option) any later version. For more
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* information, see COPYING.
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*/
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#endregion
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using System;
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namespace OpenRA.Mods.Common.Pathfinder
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{
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/// <summary>
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/// Describes the three states that a node in the graph can have.
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/// Based on A* algorithm specification
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/// </summary>
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public enum CellStatus : byte
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{
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Unvisited,
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Open,
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Closed
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}
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/// <summary>
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/// Stores information about nodes in the pathfinding graph.
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/// The default value of this struct represents an <see cref="CellStatus.Unvisited"/> location.
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/// </summary>
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public readonly struct CellInfo
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{
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/// <summary>
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/// The status of this node. Accessing other fields is only valid when the status is not <see cref="CellStatus.Unvisited"/>.
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/// </summary>
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public readonly CellStatus Status;
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/// <summary>
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/// The cost to move from the start up to this node.
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/// </summary>
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public readonly int CostSoFar;
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/// <summary>
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/// The estimation of how far this node is from our target.
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/// </summary>
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public readonly int EstimatedTotalCost;
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/// <summary>
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/// The previous node of this one that follows the shortest path.
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/// </summary>
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public readonly CPos PreviousNode;
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public CellInfo(CellStatus status, int costSoFar, int estimatedTotalCost, CPos previousNode)
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{
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if (status == CellStatus.Unvisited)
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throw new ArgumentException(
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$"The default {nameof(CellInfo)} is the only such {nameof(CellInfo)} allowed for representing an {nameof(CellStatus.Unvisited)} location.",
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nameof(status));
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Status = status;
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CostSoFar = costSoFar;
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EstimatedTotalCost = estimatedTotalCost;
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PreviousNode = previousNode;
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}
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public override string ToString()
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{
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if (Status == CellStatus.Unvisited)
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return Status.ToString();
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return
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$"{Status} {nameof(CostSoFar)}={CostSoFar} " +
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$"{nameof(EstimatedTotalCost)}={EstimatedTotalCost} {nameof(PreviousNode)}={PreviousNode}";
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}
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}
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}
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