7cfece6dc0
To resolve the ambiguity introduced when the introduction of isometric maps meant that cell and map coordinates were no longer equivalent, a new type has been introduced so they can each be represented separately.
64 lines
1.9 KiB
C#
64 lines
1.9 KiB
C#
#region Copyright & License Information
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/*
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* Copyright 2007-2014 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. For more information,
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* see COPYING.
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*/
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#endregion
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using System;
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using System.Drawing;
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namespace OpenRA
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{
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public struct MPos : IEquatable<MPos>
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{
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public readonly int U, V;
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public MPos(int u, int v) { U = u; V = v; }
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public static readonly MPos Zero = new MPos(0, 0);
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public static bool operator ==(MPos me, MPos other) { return me.U == other.U && me.V == other.V; }
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public static bool operator !=(MPos me, MPos other) { return !(me == other); }
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public override int GetHashCode() { return U.GetHashCode() ^ V.GetHashCode(); }
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public bool Equals(MPos other) { return other == this; }
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public override bool Equals(object obj) { return obj is MPos && Equals((MPos)obj); }
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public MPos Clamp(Rectangle r)
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{
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return new MPos(Math.Min(r.Right, Math.Max(U, r.Left)),
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Math.Min(r.Bottom, Math.Max(V, r.Top)));
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}
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public override string ToString() { return U + "," + V; }
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public CPos ToCPos(Map map)
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{
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return ToCPos(map.TileShape);
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}
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public CPos ToCPos(TileShape shape)
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{
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if (shape == TileShape.Rectangle)
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return new CPos(U, V);
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// Convert from rectangular map position to diamond cell position
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// - The staggered rows make this fiddly (hint: draw a diagram!)
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// (a) Consider the relationships:
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// - +1u (even -> odd) adds (1, -1) to (x, y)
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// - +1v (even -> odd) adds (1, 0) to (x, y)
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// - +1v (odd -> even) adds (0, 1) to (x, y)
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// (b) Therefore:
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// - au + 2bv adds (a + b) to (x, y)
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// - a correction factor is added if v is odd
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var offset = (V & 1) == 1 ? 1 : 0;
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var y = (V - offset) / 2 - U;
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var x = V - y;
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return new CPos(x, y);
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}
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}
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} |