hondacrx
616 lines
24 KiB
C#
616 lines
24 KiB
C#
/*
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* Copyright (C) 2012-2018 CypherCore <http://github.com/CypherCore>
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* Copyright (C) 2003-2004 Eran Kampf eran@ekampf.com http://www.ekampf.com
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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using System;
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using System.Collections.Generic;
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using System.ComponentModel;
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using System.Diagnostics;
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using System.Runtime.InteropServices;
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using System.Text.RegularExpressions;
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namespace Framework.GameMath
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{
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/// <summary>
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/// Represents a 2-dimentional single-precision floating point matrix.
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/// </summary>
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[Serializable]
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[StructLayout(LayoutKind.Sequential)]
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[TypeConverter(typeof(ExpandableObjectConverter))]
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public struct Matrix2 : ICloneable
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{
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#region Private Fields
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private float _m11, _m12;
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private float _m21, _m22;
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#endregion
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#region Constructors
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/// <summary>
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/// Initializes a new instance of the <see cref="Matrix2"/> structure with the specified values.
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/// </summary>
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public Matrix2(float m11, float m12, float m21, float m22)
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{
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_m11 = m11; _m12 = m12;
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_m21 = m21; _m22 = m22;
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}
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/// <summary>
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/// Initializes a new instance of the <see cref="Matrix2"/> structure with the specified values.
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/// </summary>
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/// <param name="elements">An array containing the matrix values in row-major order.</param>
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public Matrix2(float[] elements)
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{
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Debug.Assert(elements != null);
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Debug.Assert(elements.Length >= 4);
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_m11 = elements[0]; _m12 = elements[1];
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_m21 = elements[2]; _m22 = elements[3];
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}
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/// <summary>
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/// Initializes a new instance of the <see cref="Matrix4"/> structure with the specified values.
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/// </summary>
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/// <param name="elements">An array containing the matrix values in row-major order.</param>
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public Matrix2(List<float> elements)
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{
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Debug.Assert(elements != null);
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Debug.Assert(elements.Count >= 4);
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_m11 = elements[0]; _m12 = elements[1];
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_m21 = elements[2]; _m22 = elements[3];
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}
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/// <summary>
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/// Initializes a new instance of the <see cref="Matrix2"/> structure with the specified values.
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/// </summary>
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/// <param name="column1">A <see cref="Vector2"/> instance holding values for the first column.</param>
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/// <param name="column2">A <see cref="Vector2"/> instance holding values for the second column.</param>
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public Matrix2(Vector2 column1, Vector2 column2)
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{
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_m11 = column1.X; _m12 = column2.X;
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_m21 = column1.Y; _m22 = column2.Y;
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}
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/// <summary>
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/// Initializes a new instance of the <see cref="Matrix2"/> class using a given matrix.
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/// </summary>
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public Matrix2(Matrix2 m)
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{
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_m11 = m.M11; _m12 = m.M12;
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_m21 = m.M21; _m22 = m.M22;
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}
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#endregion
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#region Constants
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/// <summary>
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/// 4-dimentional single-precision floating point zero matrix.
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/// </summary>
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public static readonly Matrix2 Zero = new Matrix2(0, 0, 0, 0);
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/// <summary>
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/// 4-dimentional single-precision floating point identity matrix.
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/// </summary>
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public static readonly Matrix2 Identity = new Matrix2(1, 0, 0, 1);
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#endregion
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#region Public Properties
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/// <summary>
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/// Gets or sets the value of the [1,1] matrix element.
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/// </summary>
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/// <value>A single-precision floating-point number.</value>
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public float M11
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{
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get { return _m11; }
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set { _m11 = value; }
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}
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/// <summary>
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/// Gets or sets the value of the [1,2] matrix element.
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/// </summary>
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/// <value>A single-precision floating-point number.</value>
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public float M12
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{
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get { return _m12; }
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set { _m12 = value; }
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}
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/// <summary>
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/// Gets or sets the value of the [2,1] matrix element.
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/// </summary>
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/// <value>A single-precision floating-point number.</value>
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public float M21
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{
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get { return _m21; }
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set { _m21 = value; }
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}
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/// <summary>
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/// Gets or sets the value of the [2,2] matrix element.
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/// </summary>
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/// <value>A single-precision floating-point number.</value>
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public float M22
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{
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get { return _m22; }
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set { _m22 = value; }
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}
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/// <summary>
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/// Gets the matrix's trace value.
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/// </summary>
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/// <value>A single-precision floating-point number.</value>
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public float Trace
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{
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get
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{
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return _m11 + _m22;
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}
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}
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#endregion
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#region ICloneable Members
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/// <summary>
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/// Creates an exact copy of this <see cref="Matrix2"/> object.
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/// </summary>
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/// <returns>The <see cref="Matrix2"/> object this method creates, cast as an object.</returns>
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object ICloneable.Clone()
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{
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return new Matrix2(this);
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}
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/// <summary>
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/// Creates an exact copy of this <see cref="Matrix2"/> object.
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/// </summary>
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/// <returns>The <see cref="Matrix2"/> object this method creates.</returns>
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public Matrix2 Clone()
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{
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return new Matrix2(this);
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}
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#endregion
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#region Public Static Parse Methods
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private const string regularExp = @"2x2\s*\[(?<m11>.*),(?<m12>.*),(?<m21>.*),(?<m22>.*)\]";
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/// <summary>
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/// Converts the specified string to its <see cref="Matrix2"/> equivalent.
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/// </summary>
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/// <param name="value">A string representation of a <see cref="Matrix2"/>.</param>
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/// <returns>A <see cref="Matrix2"/> that represents the vector specified by the <paramref name="value"/> parameter.</returns>
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/// <remarks>
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/// The string should be in the following form: "2x2..matrix elements..>".<br/>
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/// Exmaple : "2x2[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16]"
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/// </remarks>
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public static Matrix2 Parse(string value)
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{
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Regex r = new Regex(regularExp, RegexOptions.Singleline | RegexOptions.IgnorePatternWhitespace);
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Match m = r.Match(value);
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if (m.Success)
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{
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return new Matrix2(
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float.Parse(m.Result("${m11}")),
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float.Parse(m.Result("${m12}")),
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float.Parse(m.Result("${m21}")),
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float.Parse(m.Result("${m22}"))
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);
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}
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else
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{
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throw new Exception("Unsuccessful Match.");
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}
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}
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/// <summary>
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/// Converts the specified string to its <see cref="Matrix2"/> equivalent.
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/// A return value indicates whether the conversion succeeded or failed.
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/// </summary>
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/// <param name="value">A string representation of a <see cref="Matrix2"/>.</param>
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/// <param name="result">
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/// When this method returns, if the conversion succeeded,
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/// contains a <see cref="Matrix2"/> representing the vector specified by <paramref name="value"/>.
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/// </param>
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/// <returns><see langword="true"/> if value was converted successfully; otherwise, <see langword="false"/>.</returns>
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/// <remarks>
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/// The string should be in the following form: "2x2..matrix elements..>".<br/>
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/// Exmaple : "2x2[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16]"
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/// </remarks>
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public static bool TryParse(string value, out Matrix2 result)
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{
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Regex r = new Regex(regularExp, RegexOptions.Singleline);
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Match m = r.Match(value);
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if (m.Success)
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{
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result = new Matrix2(
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float.Parse(m.Result("${m11}")),
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float.Parse(m.Result("${m12}")),
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float.Parse(m.Result("${m21}")),
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float.Parse(m.Result("${m22}"))
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);
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return true;
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}
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result = Matrix2.Zero;
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return false;
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}
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#endregion
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#region Public Static Matrix Arithmetics
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/// <summary>
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/// Adds two matrices.
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/// </summary>
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/// <param name="left">A <see cref="Matrix2"/> instance.</param>
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/// <param name="right">A <see cref="Matrix2"/> instance.</param>
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/// <returns>A new <see cref="Matrix2"/> instance containing the sum.</returns>
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public static Matrix2 Add(Matrix2 left, Matrix2 right)
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{
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return new Matrix2(
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left.M11 + right.M11, left.M12 + right.M12,
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left.M21 + right.M21, left.M22 + right.M22
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);
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}
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/// <summary>
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/// Adds a matrix and a scalar.
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/// </summary>
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/// <param name="matrix">A <see cref="Matrix2"/> instance.</param>
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/// <param name="scalar">A single-precision floating-point number.</param>
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/// <returns>A new <see cref="Matrix2"/> instance containing the sum.</returns>
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public static Matrix2 Add(Matrix2 matrix, float scalar)
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{
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return new Matrix2(
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matrix.M11 + scalar, matrix.M12 + scalar,
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matrix.M21 + scalar, matrix.M22 + scalar
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);
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}
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/// <summary>
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/// Adds two matrices and put the result in a third matrix.
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/// </summary>
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/// <param name="left">A <see cref="Matrix2"/> instance.</param>
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/// <param name="right">A <see cref="Matrix2"/> instance.</param>
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/// <param name="result">A <see cref="Matrix2"/> instance to hold the result.</param>
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public static void Add(Matrix2 left, Matrix2 right, ref Matrix2 result)
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{
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result.M11 = left.M11 + right.M11;
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result.M12 = left.M12 + right.M12;
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result.M21 = left.M21 + right.M21;
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result.M22 = left.M22 + right.M22;
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}
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/// <summary>
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/// Adds a matrix and a scalar and put the result in a third matrix.
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/// </summary>
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/// <param name="matrix">A <see cref="Matrix2"/> instance.</param>
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/// <param name="scalar">A single-precision floating-point number.</param>
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/// <param name="result">A <see cref="Matrix2"/> instance to hold the result.</param>
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public static void Add(Matrix2 matrix, float scalar, ref Matrix2 result)
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{
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result.M11 = matrix.M11 + scalar;
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result.M12 = matrix.M12 + scalar;
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result.M21 = matrix.M21 + scalar;
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result.M22 = matrix.M22 + scalar;
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}
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/// <summary>
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/// Subtracts a matrix from a matrix.
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/// </summary>
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/// <param name="left">A <see cref="Matrix2"/> instance to subtract from.</param>
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/// <param name="right">A <see cref="Matrix2"/> instance to subtract.</param>
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/// <returns>A new <see cref="Matrix2"/> instance containing the difference.</returns>
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/// <remarks>result[x][y] = left[x][y] - right[x][y]</remarks>
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public static Matrix2 Subtract(Matrix2 left, Matrix2 right)
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{
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return new Matrix2(
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left.M11 - right.M11, left.M12 - right.M12,
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left.M21 - right.M21, left.M22 - right.M22
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);
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}
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/// <summary>
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/// Subtracts a scalar from a matrix.
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/// </summary>
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/// <param name="matrix">A <see cref="Matrix2"/> instance.</param>
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/// <param name="scalar">A single-precision floating-point number.</param>
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/// <returns>A new <see cref="Matrix2"/> instance containing the difference.</returns>
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public static Matrix2 Subtract(Matrix2 matrix, float scalar)
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{
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return new Matrix2(
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matrix.M11 - scalar, matrix.M12 - scalar,
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matrix.M21 - scalar, matrix.M22 - scalar
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);
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}
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/// <summary>
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/// Subtracts a matrix from a matrix and put the result in a third matrix.
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/// </summary>
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/// <param name="left">A <see cref="Matrix2"/> instance to subtract from.</param>
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/// <param name="right">A <see cref="Matrix2"/> instance to subtract.</param>
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/// <param name="result">A <see cref="Matrix2"/> instance to hold the result.</param>
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/// <remarks>result[x][y] = left[x][y] - right[x][y]</remarks>
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public static void Subtract(Matrix2 left, Matrix2 right, ref Matrix2 result)
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{
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result.M11 = left.M11 - right.M11;
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result.M12 = left.M12 - right.M12;
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result.M21 = left.M21 - right.M21;
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result.M22 = left.M22 - right.M22;
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}
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/// <summary>
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/// Subtracts a scalar from a matrix and put the result in a third matrix.
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/// </summary>
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/// <param name="matrix">A <see cref="Matrix2"/> instance.</param>
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/// <param name="scalar">A single-precision floating-point number.</param>
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/// <param name="result">A <see cref="Matrix2"/> instance to hold the result.</param>
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public static void Subtract(Matrix2 matrix, float scalar, ref Matrix2 result)
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{
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result.M11 = matrix.M11 - scalar;
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result.M12 = matrix.M12 - scalar;
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result.M21 = matrix.M21 - scalar;
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result.M22 = matrix.M22 - scalar;
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}
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/// <summary>
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/// Multiplies two matrices.
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/// </summary>
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/// <param name="left">A <see cref="Matrix2"/> instance.</param>
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/// <param name="right">A <see cref="Matrix2"/> instance.</param>
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/// <returns>A new <see cref="Matrix2"/> instance containing the result.</returns>
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public static Matrix2 Multiply(Matrix2 left, Matrix2 right)
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{
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return new Matrix2(
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left.M11 * right.M11 + left.M12 * right.M21,
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left.M11 * right.M12 + left.M12 * right.M22,
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left.M21 * right.M11 + left.M22 * right.M21,
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left.M21 * right.M12 + left.M22 * right.M22
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);
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}
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/// <summary>
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/// Multiplies two matrices and put the result in a third matrix.
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/// </summary>
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/// <param name="left">A <see cref="Matrix2"/> instance.</param>
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/// <param name="right">A <see cref="Matrix2"/> instance.</param>
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/// <param name="result">A <see cref="Matrix2"/> instance to hold the result.</param>
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public static void Multiply(Matrix2 left, Matrix2 right, ref Matrix2 result)
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{
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result.M11 = left.M11 * right.M11 + left.M12 * right.M21;
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result.M12 = left.M11 * right.M12 + left.M12 * right.M22;
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result.M21 = left.M21 * right.M11 + left.M22 * right.M21;
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result.M22 = left.M21 * right.M12 + left.M22 * right.M22;
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}
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/// <summary>
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/// Transforms a given vector by a matrix.
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/// </summary>
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/// <param name="matrix">A <see cref="Matrix2"/> instance.</param>
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/// <param name="vector">A <see cref="Vector2"/> instance.</param>
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/// <returns>A new <see cref="Vector2"/> instance containing the result.</returns>
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public static Vector2 Transform(Matrix2 matrix, Vector2 vector)
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{
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return new Vector2(
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(matrix.M11 * vector.X) + (matrix.M12 * vector.Y),
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(matrix.M21 * vector.X) + (matrix.M22 * vector.Y));
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}
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/// <summary>
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/// Transforms a given vector by a matrix and put the result in a vector.
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/// </summary>
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/// <param name="matrix">A <see cref="Matrix2"/> instance.</param>
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/// <param name="vector">A <see cref="Vector2"/> instance.</param>
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/// <param name="result">A <see cref="Vector2"/> instance to hold the result.</param>
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public static void Transform(Matrix2 matrix, Vector2 vector, ref Vector2 result)
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{
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result.X = (matrix.M11 * vector.X) + (matrix.M12 * vector.Y);
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result.Y = (matrix.M21 * vector.X) + (matrix.M22 * vector.Y);
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}
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/// <summary>
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/// Transposes a matrix.
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/// </summary>
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/// <param name="m">A <see cref="Matrix2"/> instance.</param>
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/// <returns>A new <see cref="Matrix2"/> instance containing the transposed matrix.</returns>
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public static Matrix2 Transpose(Matrix2 m)
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{
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Matrix2 t = new Matrix2(m);
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t.Transpose();
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return t;
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}
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#endregion
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#region System.Object overrides
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/// <summary>
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/// Returns the hashcode for this instance.
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/// </summary>
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/// <returns>A 32-bit signed integer hash code.</returns>
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public override int GetHashCode()
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{
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return
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_m11.GetHashCode() ^ _m12.GetHashCode() ^
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_m21.GetHashCode() ^ _m22.GetHashCode();
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}
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/// <summary>
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/// Returns a value indicating whether this instance is equal to
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/// the specified object.
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/// </summary>
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/// <param name="obj">An object to compare to this instance.</param>
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/// <returns><see langword="true"/> if <paramref name="obj"/> is a <see cref="Matrix2"/> and has the same values as this instance; otherwise, <see langword="false"/>.</returns>
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public override bool Equals(object obj)
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{
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if (obj is Matrix2)
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{
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Matrix2 m = (Matrix2)obj;
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return
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(_m11 == m.M11) && (_m12 == m.M12) &&
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(_m21 == m.M21) && (_m22 == m.M22);
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}
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return false;
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}
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/// <summary>
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/// Returns a string representation of this object.
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/// </summary>
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/// <returns>A string representation of this object.</returns>
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public override string ToString()
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{
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return string.Format("2x2[{0}, {1}, {2}, {3}]",
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_m11, _m12, _m21, _m22);
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}
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#endregion
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#region Public Methods
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/// <summary>
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/// Calculates the determinant value of the matrix.
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/// </summary>
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/// <returns>The determinant value of the matrix.</returns>
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public float GetDeterminant()
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{
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return (_m11 * _m22) - (_m12 * _m21);
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}
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/// <summary>
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/// Transposes this matrix.
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/// </summary>
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public void Transpose()
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{
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MathFunctions.Swap(ref _m12, ref _m21);
|
|
}
|
|
#endregion
|
|
|
|
#region Comparison Operators
|
|
/// <summary>
|
|
/// Tests whether two specified matrices are equal.
|
|
/// </summary>
|
|
/// <param name="left">A <see cref="Matrix2"/> instance.</param>
|
|
/// <param name="right">A <see cref="Matrix2"/> instance.</param>
|
|
/// <returns><see langword="true"/> if the two matrices are equal; otherwise, <see langword="false"/>.</returns>
|
|
public static bool operator ==(Matrix2 left, Matrix2 right)
|
|
{
|
|
return ValueType.Equals(left, right);
|
|
}
|
|
/// <summary>
|
|
/// Tests whether two specified matrices are not equal.
|
|
/// </summary>
|
|
/// <param name="left">A <see cref="Matrix2"/> instance.</param>
|
|
/// <param name="right">A <see cref="Matrix2"/> instance.</param>
|
|
/// <returns><see langword="true"/> if the two matrices are not equal; otherwise, <see langword="false"/>.</returns>
|
|
public static bool operator !=(Matrix2 left, Matrix2 right)
|
|
{
|
|
return !ValueType.Equals(left, right);
|
|
}
|
|
#endregion
|
|
|
|
#region Binary Operators
|
|
/// <summary>
|
|
/// Adds two matrices.
|
|
/// </summary>
|
|
/// <param name="left">A <see cref="Matrix2"/> instance.</param>
|
|
/// <param name="right">A <see cref="Matrix2"/> instance.</param>
|
|
/// <returns>A new <see cref="Matrix2"/> instance containing the sum.</returns>
|
|
public static Matrix2 operator +(Matrix2 left, Matrix2 right)
|
|
{
|
|
return Matrix2.Add(left, right);
|
|
}
|
|
/// <summary>
|
|
/// Adds a matrix and a scalar.
|
|
/// </summary>
|
|
/// <param name="matrix">A <see cref="Matrix2"/> instance.</param>
|
|
/// <param name="scalar">A single-precision floating-point number.</param>
|
|
/// <returns>A new <see cref="Matrix2"/> instance containing the sum.</returns>
|
|
public static Matrix2 operator +(Matrix2 matrix, float scalar)
|
|
{
|
|
return Matrix2.Add(matrix, scalar);
|
|
}
|
|
/// <summary>
|
|
/// Adds a matrix and a scalar.
|
|
/// </summary>
|
|
/// <param name="matrix">A <see cref="Matrix2"/> instance.</param>
|
|
/// <param name="scalar">A single-precision floating-point number.</param>
|
|
/// <returns>A new <see cref="Matrix2"/> instance containing the sum.</returns>
|
|
public static Matrix2 operator +(float scalar, Matrix2 matrix)
|
|
{
|
|
return Matrix2.Add(matrix, scalar);
|
|
}
|
|
/// <summary>
|
|
/// Subtracts a matrix from a matrix.
|
|
/// </summary>
|
|
/// <param name="left">A <see cref="Matrix2"/> instance.</param>
|
|
/// <param name="right">A <see cref="Matrix2"/> instance.</param>
|
|
/// <returns>A new <see cref="Matrix2"/> instance containing the difference.</returns>
|
|
public static Matrix2 operator -(Matrix2 left, Matrix2 right)
|
|
{
|
|
return Matrix2.Subtract(left, right);
|
|
}
|
|
/// <summary>
|
|
/// Subtracts a scalar from a matrix.
|
|
/// </summary>
|
|
/// <param name="matrix">A <see cref="Matrix2"/> instance.</param>
|
|
/// <param name="scalar">A single-precision floating-point number.</param>
|
|
/// <returns>A new <see cref="Matrix2"/> instance containing the difference.</returns>
|
|
public static Matrix2 operator -(Matrix2 matrix, float scalar)
|
|
{
|
|
return Matrix2.Subtract(matrix, scalar);
|
|
}
|
|
/// <summary>
|
|
/// Multiplies two matrices.
|
|
/// </summary>
|
|
/// <param name="left">A <see cref="Matrix2"/> instance.</param>
|
|
/// <param name="right">A <see cref="Matrix2"/> instance.</param>
|
|
/// <returns>A new <see cref="Matrix2"/> instance containing the result.</returns>
|
|
public static Matrix2 operator *(Matrix2 left, Matrix2 right)
|
|
{
|
|
return Matrix2.Multiply(left, right);
|
|
}
|
|
/// <summary>
|
|
/// Transforms a given vector by a matrix.
|
|
/// </summary>
|
|
/// <param name="matrix">A <see cref="Matrix2"/> instance.</param>
|
|
/// <param name="vector">A <see cref="Vector2"/> instance.</param>
|
|
/// <returns>A new <see cref="Vector2"/> instance containing the result.</returns>
|
|
public static Vector2 operator *(Matrix2 matrix, Vector2 vector)
|
|
{
|
|
return Matrix2.Transform(matrix, vector);
|
|
}
|
|
#endregion
|
|
|
|
#region Indexing Operators
|
|
/// <summary>
|
|
/// Indexer allowing to access the matrix elements by an index
|
|
/// where index = 2*row + column.
|
|
/// </summary>
|
|
public unsafe float this[int index]
|
|
{
|
|
get
|
|
{
|
|
if (index < 0 || index >= 4)
|
|
throw new IndexOutOfRangeException("Invalid matrix index!");
|
|
|
|
fixed (float* f = &_m11)
|
|
{
|
|
return *(f + index);
|
|
}
|
|
}
|
|
set
|
|
{
|
|
if (index < 0 || index >= 4)
|
|
throw new IndexOutOfRangeException("Invalid matrix index!");
|
|
|
|
fixed (float* f = &_m11)
|
|
{
|
|
*(f + index) = value;
|
|
}
|
|
}
|
|
}
|
|
/// <summary>
|
|
/// Indexer allowing to access the matrix elements by row and column.
|
|
/// </summary>
|
|
public float this[int row, int column]
|
|
{
|
|
get
|
|
{
|
|
return this[(row - 1) * 2 + (column - 1)];
|
|
}
|
|
set
|
|
{
|
|
this[(row - 1) * 2 + (column - 1)] = value;
|
|
}
|
|
}
|
|
#endregion
|
|
}
|
|
}
|