// -----------------------------------------------------------------------
// <copyright file="Point.cs" company="Steven Kirk">
// Copyright 2014 MIT Licence. See licence.md for more information.
// </copyright>
// -----------------------------------------------------------------------

namespace Perspex
{
    using System.Globalization;

    /// <summary>
    /// Defines a point.
    /// </summary>
    public struct Point
    {
        /// <summary>
        /// The X position.
        /// </summary>
        private double x;

        /// <summary>
        /// The Y position.
        /// </summary>
        private double y;

        /// <summary>
        /// Initializes a new instance of the <see cref="Point"/> structure.
        /// </summary>
        /// <param name="x">The X position.</param>
        /// <param name="y">The Y position.</param>
        public Point(double x, double y)
        {
            this.x = x;
            this.y = y;
        }

        /// <summary>
        /// Gets the X position.
        /// </summary>
        public double X
        {
            get { return this.x; }
        }

        /// <summary>
        /// Gets the Y position.
        /// </summary>
        public double Y
        {
            get { return this.y; }
        }

        public static Point operator -(Point a, Point b)
        {
            return new Point(a.x - b.x, a.y - b.y);
        }

        /// <summary>
        /// Returns the string representation of the point.
        /// </summary>
        /// <returns>The string representation of the point.</returns>
        public override string ToString()
        {
            return string.Format(CultureInfo.InvariantCulture, "{0}, {1}", this.x, this.y);
        }
    }
}