102 lines
2.2 KiB
C#
102 lines
2.2 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.Collections;
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using System.Collections.Generic;
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using System.Drawing;
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using OpenRA.Graphics;
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namespace OpenRA
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{
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// Represents a (on-screen) rectangular collection of tiles.
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// TopLeft and BottomRight are inclusive
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public class CellRegion : IEnumerable<CPos>
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{
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// Corners of the region
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public readonly CPos TopLeft;
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public readonly CPos BottomRight;
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// Corners in map coordinates
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// Defined for forward compatibility with diagonal cell grids
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readonly CPos mapTopLeft;
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readonly CPos mapBottomRight;
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public CellRegion(CPos topLeft, CPos bottomRight)
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{
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TopLeft = topLeft;
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BottomRight = bottomRight;
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mapTopLeft = TopLeft;
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mapBottomRight = BottomRight;
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}
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public bool Contains(CPos cell)
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{
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// Defined for forward compatibility with diagonal cell grids
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var uv = cell;
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return uv.X >= mapTopLeft.X && uv.X <= mapBottomRight.X && uv.Y >= mapTopLeft.Y && uv.Y <= mapBottomRight.Y;
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}
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public IEnumerator<CPos> GetEnumerator()
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{
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return new CellRegionEnumerator(this);
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}
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IEnumerator IEnumerable.GetEnumerator()
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{
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return GetEnumerator();
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}
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class CellRegionEnumerator : IEnumerator<CPos>
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{
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readonly CellRegion r;
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// Current position, in map coordinates
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int u, v;
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public CellRegionEnumerator(CellRegion region)
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{
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r = region;
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Reset();
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}
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public bool MoveNext()
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{
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u += 1;
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// Check for column overflow
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if (u > r.mapBottomRight.X)
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{
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v += 1;
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u = r.mapTopLeft.X;
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// Check for row overflow
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if (v > r.mapBottomRight.Y)
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return false;
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}
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return true;
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}
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public void Reset()
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{
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// Enumerator starts *before* the first element in the sequence.
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u = r.mapTopLeft.X - 1;
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v = r.mapTopLeft.Y;
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}
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public CPos Current { get { return new CPos(u, v); } }
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object IEnumerator.Current { get { return Current; } }
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public void Dispose() { }
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}
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}
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}
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