114 lines
4.0 KiB
C#
114 lines
4.0 KiB
C#
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namespace Ananta.Server.Protocol.Client4229938;
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/// <summary>
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/// 搜打撤的格子占位模型 —— 逐条镜像客户端 LX6/Manager/ExtractionShooterUtils.lua 的
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/// OccupyCells / CheckCanAddItemByCell / TryGetFreeCellByOrder。
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///
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/// 为什么必须镜像：客户端拖拽落地前会**自己**用这套规则校验一次（CheckShiftItemInBag、
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/// CheckCellAllowed、TryGetFreeCellIndexByConfigId），服务端如果只判"原点格空不空"，
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/// 就会出现「2x3 的物品和 1 格的物品叠在一起」——因为 2x3 的覆盖区里那些非原点格在服务端看来是空的。
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///
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/// 三条硬约束（照抄客户端，不要"优化"）：
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/// 1. 坐标是 0 基，合法范围 x∈[0,sizeX-1]、y∈[0,sizeY-1]。
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/// 2. 物品占 Volume.x × Volume.y，IsRotated 时两者互换。
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/// 3. 找空格是 y 外层、x 内层（先铺满一行再换行），无旋转优先、旋转次之。
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/// </summary>
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internal sealed class ExtractionGrid4229938
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{
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private readonly bool[] _cells;
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internal ExtractionGrid4229938(int sizeX, int sizeY)
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{
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SizeX = Math.Max(1, sizeX);
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SizeY = Math.Max(1, sizeY);
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_cells = new bool[SizeX * SizeY];
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}
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internal int SizeX { get; }
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internal int SizeY { get; }
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/// <summary>把 Volume 按旋转换算成实际占格 (宽, 高)。</summary>
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internal static (int W, int H) Rotate(int volumeX, int volumeY, bool isRotated)
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=> isRotated ? (Math.Max(1, volumeY), Math.Max(1, volumeX))
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: (Math.Max(1, volumeX), Math.Max(1, volumeY));
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internal bool InBounds(int x, int y)
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=> x >= 0 && y >= 0 && x < SizeX && y < SizeY;
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internal bool IsFree(int x, int y) => InBounds(x, y) && !_cells[(y * SizeX) + x];
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/// <summary>整块 (x,y,w,h) 是否都在界内且没被占。对应客户端 CheckCanAddItemByCell。</summary>
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internal bool CanPlace(int x, int y, int w, int h)
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{
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if (x < 0 || y < 0 || w <= 0 || h <= 0)
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return false;
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if (x + w > SizeX || y + h > SizeY)
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return false;
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for (var oy = 0; oy < h; oy++)
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for (var ox = 0; ox < w; ox++)
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if (_cells[((y + oy) * SizeX) + x + ox])
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return false;
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return true;
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}
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internal void Occupy(int x, int y, int w, int h)
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{
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for (var oy = 0; oy < h; oy++)
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for (var ox = 0; ox < w; ox++)
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if (InBounds(x + ox, y + oy))
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_cells[((y + oy) * SizeX) + x + ox] = true;
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}
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internal void Release(int x, int y, int w, int h)
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{
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for (var oy = 0; oy < h; oy++)
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for (var ox = 0; ox < w; ox++)
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if (InBounds(x + ox, y + oy))
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_cells[((y + oy) * SizeX) + x + ox] = false;
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}
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/// <summary>
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/// 按客户端的顺序找第一个能放下 (w,h) 的格子：y 外层、x 内层。
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/// 与 TryGetFreeCellByOrder 的扫描顺序一致 —— 顺序不一致会导致服务端认为"放得下"、
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/// 客户端认为"放不下"，玩家看到的就是拖过去弹回。
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/// </summary>
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internal bool TryFirstFit(int w, int h, out int x, out int y)
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{
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x = 0;
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y = 0;
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if (w > SizeX || h > SizeY)
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return false;
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for (var cy = 0; cy <= SizeY - h; cy++)
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for (var cx = 0; cx <= SizeX - w; cx++)
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if (CanPlace(cx, cy, w, h))
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{
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x = cx;
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y = cy;
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return true;
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}
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return false;
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}
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/// <summary>先试不旋转，再试旋转。对应 TryGetFreeCellByOrderWithRotation。</summary>
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internal bool TryFirstFitWithRotation(int volumeX, int volumeY, out int x, out int y, out bool rotated)
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{
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if (TryFirstFit(volumeX, volumeY, out x, out y))
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{
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rotated = false;
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return true;
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}
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if (TryFirstFit(volumeY, volumeX, out x, out y))
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{
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rotated = true;
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return true;
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}
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rotated = false;
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return false;
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}
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}
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