147 lines
3.7 KiB
C#
147 lines
3.7 KiB
C#
#region Copyright & License Information
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/*
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* Copyright 2007-2021 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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using OpenRA.Primitives;
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namespace OpenRA
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{
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// Represents a layer of "something" that covers the map
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public sealed class CellLayer<T> : CellLayerBase<T>
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{
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public event Action<CPos> CellEntryChanged = null;
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public CellLayer(Map map)
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: base(map) { }
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public CellLayer(MapGridType gridType, Size size)
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: base(gridType, size) { }
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public override void CopyValuesFrom(CellLayerBase<T> anotherLayer)
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{
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if (CellEntryChanged != null)
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throw new InvalidOperationException(
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$"Cannot copy values when there are listeners attached to the {nameof(CellEntryChanged)} event.");
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base.CopyValuesFrom(anotherLayer);
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}
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public override void Clear()
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{
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if (CellEntryChanged != null)
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throw new InvalidOperationException(
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$"Cannot clear values when there are listeners attached to the {nameof(CellEntryChanged)} event.");
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base.Clear();
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}
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public override void Clear(T clearValue)
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{
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if (CellEntryChanged != null)
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throw new InvalidOperationException(
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$"Cannot clear values when there are listeners attached to the {nameof(CellEntryChanged)} event.");
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base.Clear(clearValue);
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}
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// Resolve an array index from cell coordinates
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int Index(CPos cell)
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{
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// PERF: Inline CPos.ToMPos to avoid MPos allocation
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var x = cell.X;
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var y = cell.Y;
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if (GridType == MapGridType.Rectangular)
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return y * Size.Width + x;
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var u = (x - y) / 2;
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var v = x + y;
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return v * Size.Width + u;
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}
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// Resolve an array index from map coordinates
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int Index(MPos uv)
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{
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return uv.V * Size.Width + uv.U;
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}
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/// <summary>Gets or sets the <see cref="CellLayer"/> using cell coordinates</summary>
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public T this[CPos cell]
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{
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get => entries[Index(cell)];
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set
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{
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entries[Index(cell)] = value;
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CellEntryChanged?.Invoke(cell);
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}
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}
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/// <summary>Gets or sets the layer contents using raw map coordinates (not CPos!)</summary>
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public T this[MPos uv]
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{
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get => entries[Index(uv)];
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set
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{
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entries[Index(uv)] = value;
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CellEntryChanged?.Invoke(uv.ToCPos(GridType));
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}
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}
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public bool Contains(CPos cell)
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{
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// .ToMPos() returns the same result if the X and Y coordinates
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// are switched. X < Y is invalid in the RectangularIsometric coordinate system,
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// so we pre-filter these to avoid returning the wrong result
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if (GridType == MapGridType.RectangularIsometric && cell.X < cell.Y)
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return false;
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return Contains(cell.ToMPos(GridType));
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}
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public bool Contains(MPos uv)
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{
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return bounds.Contains(uv.U, uv.V);
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}
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public CPos Clamp(CPos uv)
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{
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return Clamp(uv.ToMPos(GridType)).ToCPos(GridType);
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}
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public MPos Clamp(MPos uv)
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{
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return uv.Clamp(new Rectangle(0, 0, Size.Width - 1, Size.Height - 1));
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}
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}
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// Helper functions
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public static class CellLayer
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{
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/// <summary>Create a new layer by resizing another layer. New cells are filled with defaultValue.</summary>
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public static CellLayer<T> Resize<T>(CellLayer<T> layer, Size newSize, T defaultValue)
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{
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var result = new CellLayer<T>(layer.GridType, newSize);
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var width = Math.Min(layer.Size.Width, newSize.Width);
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var height = Math.Min(layer.Size.Height, newSize.Height);
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result.Clear(defaultValue);
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for (var j = 0; j < height; j++)
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for (var i = 0; i < width; i++)
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result[new MPos(i, j)] = layer[new MPos(i, j)];
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return result;
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}
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}
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}
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