42 lines
1.8 KiB
C#
42 lines
1.8 KiB
C#
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namespace Theriapolis.Core.Tactical;
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/// <summary>
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/// Integer (cx, cy) key for a tactical chunk. The chunk covers world-pixel
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/// rectangle [cx*CHUNK_SIZE, cy*CHUNK_SIZE, (cx+1)*CHUNK_SIZE, (cy+1)*CHUNK_SIZE).
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/// At the current constants (CHUNK_SIZE = 64, TACTICAL_PER_WORLD_TILE = 32),
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/// each chunk covers 2×2 world tiles.
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/// </summary>
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public readonly struct ChunkCoord : IEquatable<ChunkCoord>
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{
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public readonly int X;
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public readonly int Y;
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public ChunkCoord(int x, int y) { X = x; Y = y; }
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/// <summary>Chunk that contains the given tactical-tile (world-pixel) coordinate.</summary>
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public static ChunkCoord ForTactical(int tx, int ty)
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=> new(FloorDiv(tx, C.TACTICAL_CHUNK_SIZE), FloorDiv(ty, C.TACTICAL_CHUNK_SIZE));
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/// <summary>Chunk that contains the given world-tile coordinate.</summary>
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public static ChunkCoord ForWorldTile(int wx, int wy)
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{
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// 1 world tile = TACTICAL_PER_WORLD_TILE world pixels = TACTICAL_PER_WORLD_TILE
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// tactical tiles. One chunk covers CHUNK_SIZE / TACTICAL_PER_WORLD_TILE world tiles.
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int worldTilesPerChunk = C.TACTICAL_CHUNK_SIZE / C.TACTICAL_PER_WORLD_TILE;
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return new(FloorDiv(wx, worldTilesPerChunk), FloorDiv(wy, worldTilesPerChunk));
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}
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private static int FloorDiv(int a, int b)
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{
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int q = a / b;
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if ((a ^ b) < 0 && q * b != a) q--;
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return q;
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}
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public bool Equals(ChunkCoord other) => X == other.X && Y == other.Y;
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public override bool Equals(object? obj) => obj is ChunkCoord c && Equals(c);
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public override int GetHashCode() => HashCode.Combine(X, Y);
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public static bool operator ==(ChunkCoord a, ChunkCoord b) => a.Equals(b);
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public static bool operator !=(ChunkCoord a, ChunkCoord b) => !a.Equals(b);
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public override string ToString() => $"({X},{Y})";
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}
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