#region MIT License
/*Copyright (c) 2012 Robert Rouhani <robert.rouhani@gmail.com>

SharpFont based on Tao.FreeType, Copyright (c) 2003-2007 Tao Framework Team

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.*/
#endregion

using System;
using System.Runtime.InteropServices;

using SharpFont.Internal;

#if WIN64
using FT_26Dot6 = System.Int32;
using FT_Fixed = System.Int32;
using FT_Long = System.Int32;
using FT_Pos = System.Int32;
using FT_ULong = System.UInt32;
#else
using FT_26Dot6 = System.IntPtr;
using FT_Fixed = System.IntPtr;
using FT_Long = System.IntPtr;
using FT_Pos = System.IntPtr;
using FT_ULong = System.UIntPtr;
#endif

namespace SharpFont
{
	/// <summary>
	/// A simple structure used to store a 2D vector.
	/// </summary>
	[StructLayout(LayoutKind.Sequential)]
	public struct FTVector
	{
		#region Fields

		private FT_Long x;
		private FT_Long y;

		#endregion

		#region Constructors

		/// <summary>
		/// Initializes a new instance of the <see cref="FTVector"/> struct.
		/// </summary>
		/// <param name="x">The horizontal coordinate.</param>
		/// <param name="y">The vertical coordinate.</param>
		public FTVector(int x, int y)
			: this()
		{
#if WIN64
			this.x = x;
			this.y = y;
#else
			this.x = (IntPtr)x;
			this.y = (IntPtr)y;
#endif
		}

		internal FTVector(IntPtr reference)
			: this()
		{
#if WIN64
			this.x = Marshal.ReadInt32(reference);
			this.y = Marshal.ReadInt32(reference, sizeof(int));
#else
			this.x = Marshal.ReadIntPtr(reference);
			this.y = Marshal.ReadIntPtr(reference, IntPtr.Size);
#endif
		}

		#endregion

		#region Properties

		/// <summary>
		/// Gets or sets the horizontal coordinate.
		/// </summary>
		public int X
		{
			get
			{
				return (int)x;
			}

			set
			{
#if WIN64
				x = value;
#else
				x = (IntPtr)value;
#endif
			}
		}

		/// <summary>
		/// Gets or sets the vertical coordinate.
		/// </summary>
		public int Y
		{
			get
			{
				return (int)y;
			}

			set
			{
#if WIN64
				y = value;
#else
				y = (IntPtr)value;
#endif
			}
		}

		#endregion

		#region Methods

		/// <summary><para>
		/// Return the unit vector corresponding to a given angle. After the call, the value of ‘vec.x’ will be
		/// ‘sin(angle)’, and the value of ‘vec.y’ will be ‘cos(angle)’.
		/// </para><para>
		/// This function is useful to retrieve both the sinus and cosinus of a given angle quickly.
		/// </para></summary>
		/// <param name="angle">The address of angle.</param>
		/// <returns>The address of target vector.</returns>
		public static FTVector Unit(int angle)
		{
			FTVector vec;
			FT.FT_Vector_Unit(out vec, angle);

			return vec;
		}

		/// <summary>
		/// Compute vector coordinates from a length and angle.
		/// </summary>
		/// <param name="length">The vector length.</param>
		/// <param name="angle">The vector angle.</param>
		/// <returns>The address of source vector.</returns>
		public static FTVector FromPolar(int length, int angle)
		{
			FTVector vec;
			FT.FT_Vector_From_Polar(out vec, length, angle);

			return vec;
		}

		/// <summary>
		/// Transform a single vector through a 2x2 matrix.
		/// </summary>
		/// <remarks>
		/// The result is undefined if either ‘vector’ or ‘matrix’ is invalid.
		/// </remarks>
		/// <param name="matrix">A pointer to the source 2x2 matrix.</param>
		public void Transform(FTMatrix matrix)
		{
			FT.FT_Vector_Transform(ref this, ref matrix);
		}

		/// <summary>
		/// Rotate a vector by a given angle.
		/// </summary>
		/// <param name="angle">The address of angle.</param>
		public void Rotate(int angle)
		{
			FT.FT_Vector_Rotate(ref this, angle);
		}

		/// <summary>
		/// Return the length of a given vector.
		/// </summary>
		/// <returns>The vector length, expressed in the same units that the original vector coordinates.</returns>
		public int Length()
		{
			return FT.FT_Vector_Length(ref this);
		}

		/// <summary>
		/// Compute both the length and angle of a given vector.
		/// </summary>
		/// <param name="length">The vector length.</param>
		/// <param name="angle">The vector angle.</param>
		public void Polarize(out int length, out int angle)
		{
			FT.FT_Vector_Polarize(ref this, out length, out angle);
		}

		#endregion
	}
}