//
// System.Drawing.PointF.cs
//
// Author:
//   Mike Kestner (mkestner@speakeasy.net)
//
// Copyright (C) 2001 Mike Kestner
// Copyright (C) 2004 Novell, Inc. http://www.novell.com
//

//
// Copyright (C) 2004 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//

using System;
using System.Runtime.InteropServices;
using System.ComponentModel;

namespace System.Drawing
{
	[Serializable]
	[ComVisible (true)]
	public struct PointF
	{
		// Private x and y coordinate fields.
		private float cx, cy;

		// -----------------------
		// Public Shared Members
		// -----------------------

		/// <summary>
		///	Empty Shared Field
		/// </summary>
		///
		/// <remarks>
		///	An uninitialized PointF Structure.
		/// </remarks>
		
		public static readonly PointF Empty;

		/// <summary>
		///	Addition Operator
		/// </summary>
		///
		/// <remarks>
		///	Translates a PointF using the Width and Height
		///	properties of the given Size.
		/// </remarks>

		public static PointF operator + (PointF pt, Size sz)
		{
			return new PointF (pt.X + sz.Width, pt.Y + sz.Height);
		}
		
		/// <summary>
		///	Equality Operator
		/// </summary>
		///
		/// <remarks>
		///	Compares two PointF objects. The return value is
		///	based on the equivalence of the X and Y properties 
		///	of the two points.
		/// </remarks>

		public static bool operator == (PointF pt_a, PointF pt_b)
		{
			return ((pt_a.X == pt_b.X) && (pt_a.Y == pt_b.Y));
		}
		
		/// <summary>
		///	Inequality Operator
		/// </summary>
		///
		/// <remarks>
		///	Compares two PointF objects. The return value is
		///	based on the equivalence of the X and Y properties 
		///	of the two points.
		/// </remarks>

		public static bool operator != (PointF pt_a, PointF pt_b)
		{
			return ((pt_a.X != pt_b.X) || (pt_a.Y != pt_b.Y));
		}
		
		/// <summary>
		///	Subtraction Operator
		/// </summary>
		///
		/// <remarks>
		///	Translates a PointF using the negation of the Width 
		///	and Height properties of the given Size.
		/// </remarks>

		public static PointF operator - (PointF pt, Size sz)
		{
			return new PointF (pt.X - sz.Width, pt.Y - sz.Height);
		}
		
		// -----------------------
		// Public Constructor
		// -----------------------

		/// <summary>
		///	PointF Constructor
		/// </summary>
		///
		/// <remarks>
		///	Creates a PointF from a specified x,y coordinate pair.
		/// </remarks>
		
		public PointF (float x, float y)
		{
			cx = x;
			cy = y;
		}

		// -----------------------
		// Public Instance Members
		// -----------------------

		/// <summary>
		///	IsEmpty Property
		/// </summary>
		///
		/// <remarks>
		///	Indicates if both X and Y are zero.
		/// </remarks>
		
		[Browsable (false)]
		public bool IsEmpty {
			get {
				return ((cx == 0.0) && (cy == 0.0));
			}
		}

		/// <summary>
		///	X Property
		/// </summary>
		///
		/// <remarks>
		///	The X coordinate of the PointF.
		/// </remarks>
		
		public float X {
			get {
				return cx;
			}
			set {
				cx = value;
			}
		}

		/// <summary>
		///	Y Property
		/// </summary>
		///
		/// <remarks>
		///	The Y coordinate of the PointF.
		/// </remarks>
		
		public float Y {
			get {
				return cy;
			}
			set {
				cy = value;
			}
		}

		/// <summary>
		///	Equals Method
		/// </summary>
		///
		/// <remarks>
		///	Checks equivalence of this PointF and another object.
		/// </remarks>
		
		public override bool Equals (object o)
		{
			if (!(o is PointF))
				return false;

			return (this == (PointF) o);
		}

		/// <summary>
		///	GetHashCode Method
		/// </summary>
		///
		/// <remarks>
		///	Calculates a hashing value.
		/// </remarks>
		
		public override int GetHashCode ()
		{
			return (int) cx ^ (int) cy;
		}

		/// <summary>
		///	ToString Method
		/// </summary>
		///
		/// <remarks>
		///	Formats the PointF as a string in coordinate notation.
		/// </remarks>
		
		public override string ToString ()
		{
			return String.Format ("{{X={0}, Y={1}}}", cx, cy);
		}
	}
}