#region Copyright & License Information
/*
 * Copyright 2007-2011 The OpenRA Developers (see AUTHORS)
 * This file is part of OpenRA, which is free software. It is made
 * available to you under the terms of the GNU General Public License
 * as published by the Free Software Foundation. For more information,
 * see COPYING.
 */
#endregion

using System;
using System.Drawing;

namespace OpenRA
{
	/// <summary>
	/// Pixel coordinate position in the world (fine).
	/// </summary>
	public struct PPos
	{
		public readonly int X, Y;

		public PPos(int x, int y) { X = x; Y = y; }

		public static readonly PPos Zero = new PPos(0, 0);

		public static explicit operator PPos(int2 a) { return new PPos(a.X, a.Y); }

		public static explicit operator PVecInt(PPos a) { return new PVecInt(a.X, a.Y); }
		public static explicit operator PVecFloat(PPos a) { return new PVecFloat(a.X, a.Y); }

		public static PPos operator +(PPos a, PVecInt b) { return new PPos(a.X + b.X, a.Y + b.Y); }
		public static PVecInt operator -(PPos a, PPos b) { return new PVecInt(a.X - b.X, a.Y - b.Y); }
		public static PPos operator -(PPos a, PVecInt b) { return new PPos(a.X - b.X, a.Y - b.Y); }

		public static bool operator ==(PPos me, PPos other) { return (me.X == other.X && me.Y == other.Y); }
		public static bool operator !=(PPos me, PPos other) { return !(me == other); }

		public static PPos Max(PPos a, PPos b) { return new PPos(Math.Max(a.X, b.X), Math.Max(a.Y, b.Y)); }
		public static PPos Min(PPos a, PPos b) { return new PPos(Math.Min(a.X, b.X), Math.Min(a.Y, b.Y)); }

		public static PPos Lerp(PPos a, PPos b, int mul, int div)
		{
			return a + ((PVecInt)(b - a) * mul / div);
		}

		public float2 ToFloat2() { return new float2(X, Y); }
		public int2 ToInt2() { return new int2(X, Y); }
		public CPos ToCPos() { return new CPos((int)(1f / Game.CellSize * X), (int)(1f / Game.CellSize * Y)); }
		public PSubPos ToPSubPos() { return new PSubPos(X * PSubPos.PerPx, Y * PSubPos.PerPx); }

		public PPos Clamp(Rectangle r)
		{
			return new PPos(Math.Min(r.Right, Math.Max(X, r.Left)),
							Math.Min(r.Bottom, Math.Max(Y, r.Top)));
		}

		public override int GetHashCode() { return X.GetHashCode() ^ Y.GetHashCode(); }

		public override bool Equals(object obj)
		{
			if (obj == null)
				return false;

			PPos o = (PPos)obj;
			return o == this;
		}

		public override string ToString() { return "{0},{1}".F(X, Y); }
	}
}