//
// Copyright 2016 Pixar
//
// Licensed under the Apache License, Version 2.0 (the "Apache License")
// with the following modification; you may not use this file except in
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// This file is generated by a script.  Do not edit directly.  Edit the
// matrix2.template.h file to make changes.

#ifndef GF_MATRIX2F_H
#define GF_MATRIX2F_H

#include "pxr/base/gf/matrixData.h"
#include "pxr/base/gf/vec2f.h"
#include "pxr/base/gf/traits.h"

#include <boost/functional/hash.hpp>

#include <iosfwd>
#include <vector>

/// \file matrix2f.h
/// \ingroup group_gf_LinearAlgebra
///

template <>
struct GfIsGfMatrix<class GfMatrix2f> { static const bool value = true; };

class GfMatrix2d;
class GfMatrix2f;

/// \class GfMatrix2f matrix2f.h "pxr/base/gf/matrix2f.h"
/// \ingroup group_gf_LinearAlgebra
/// \brief Stores a 2x2 matrix of \c float elements. A basic type.
///
/// Matrices are defined to be in row-major order, so <c>matrix[i][j]</c> 
/// indexes the element in the \e i th row and the \e j th column.
///
class GfMatrix2f
{
public:
    typedef float ScalarType;

    static const size_t numRows = 2;
    static const size_t numColumns = 2;

    /// Default constructor. Leaves the matrix component values
    /// undefined.
    GfMatrix2f() {}

    /// Constructor. Initializes the matrix from 4 independent
    /// \c float values, specified in row-major order. For example,
    /// parameter \e m10 specifies the value in row 1 and column 0.
    GfMatrix2f(float m00, float m01, 
               float m10, float m11) {
        Set(m00, m01, 
            m10, m11);
    }

    /// Constructor. Initializes the matrix from a 2x2 array of
    /// \c float values, specified in row-major order.
    GfMatrix2f(const float m[2][2]) {
        Set(m);
    }

    /// Constructor. Explicitly initializes the matrix to \e s times
    /// the identity matrix.
    explicit GfMatrix2f(float s) {
        SetDiagonal(s);
    }

    /// This explicit constructor initializes the matrix to \p s times
    /// the identity matrix.
    explicit GfMatrix2f(int s) {
	SetDiagonal(s);
    }

    /// Constructor. Explicitly initializes the matrix to diagonal form,
    /// with the \e i th element on the diagonal set to <c>v[i]</c>.
    explicit GfMatrix2f(const GfVec2f& v) {
        SetDiagonal(v);
    }

    /// Constructor.  Initialize the matrix from a vector of vectors of double.
    /// The vector is expected to be 2x2.  If it is too big, only the first
    /// 2 rows and/or columns will be used.  If it is too small, uninitialized
    /// elements will be filled in with the corresponding elements from an
    /// identity matrix.
    ///
    explicit GfMatrix2f(const std::vector< std::vector<double> >& v);

    /// Constructor.  Initialize the matrix from a vector of vectors of float.
    /// The vector is expected to be 2x2.  If it is too big, only the first
    /// 2 rows and/or columns will be used.  If it is too small, uninitialized
    /// elements will be filled in with the corresponding elements from an
    /// identity matrix.
    ///
    explicit GfMatrix2f(const std::vector< std::vector<float> >& v);

    //!
    // This explicit constructor converts a "double" matrix to a "float" matrix.
    explicit GfMatrix2f(const class GfMatrix2d& m);

    /// Sets a row of the matrix from a Vec2.
    void SetRow(int i, const GfVec2f & v) {
        _mtx[i][0] = v[0];
        _mtx[i][1] = v[1];
    }

    /// Sets a column of the matrix from a Vec2.
    void SetColumn(int i, const GfVec2f & v) {
        _mtx[0][i] = v[0];
        _mtx[1][i] = v[1];
    }

    /// Gets a row of the matrix as a Vec2.
    GfVec2f GetRow(int i) const {
        return GfVec2f(_mtx[i][0], _mtx[i][1]);
    }

    /// Gets a column of the matrix as a Vec2.
    GfVec2f GetColumn(int i) const {
        return GfVec2f(_mtx[0][i], _mtx[1][i]);
    }

    /// \brief Sets the matrix from 4 independent \c float values, specified
    /// in row-major order. For example, parameter \e m10 specifies the
    /// value in row 1 and column 0.
    GfMatrix2f& Set(float m00, float m01, 
                    float m10, float m11) {
        _mtx[0][0] = m00; _mtx[0][1] = m01; 
        _mtx[1][0] = m10; _mtx[1][1] = m11;
        return *this;
    }

    /// \brief Sets the matrix from a 2x2 array of \c float values, specified
    /// in row-major order.
    GfMatrix2f& Set(const float m[2][2]) {
        _mtx[0][0] = m[0][0];
        _mtx[0][1] = m[0][1];
        _mtx[1][0] = m[1][0];
        _mtx[1][1] = m[1][1];
        return *this;
    }

    /// Sets the matrix to the identity matrix.
    GfMatrix2f& SetIdentity() {
        return SetDiagonal(1);
    }

    /// Sets the matrix to zero.
    GfMatrix2f& SetZero() {
        return SetDiagonal(0);
    }

    /// Sets the matrix to \e s times the identity matrix.
    GfMatrix2f& SetDiagonal(float s);

    /// Sets the matrix to have diagonal (<c>v[0], v[1]</c>).
    GfMatrix2f& SetDiagonal(const GfVec2f&);

    /// Fills a 2x2 array of \c float values with the values in
    /// the matrix, specified in row-major order.
    float* Get(float m[2][2]);

    /// Returns vector components as an array of \c float values.
    float* GetArray()  {
        return _mtx.GetData();
    }

    /// Returns vector components as a const array of \c float values.
    const float* GetArray() const {
        return _mtx.GetData();
    }
    
    /// Accesses an indexed row \e i of the matrix as an array of 2 \c float
    /// values so that standard indexing (such as <c>m[0][1]</c>) works
    /// correctly.
    float* operator [](int i) { return _mtx[i]; }

    /// Accesses an indexed row \e i of the matrix as an array of 2 \c float
    /// values so that standard indexing (such as <c>m[0][1]</c>) works
    /// correctly.
    const float* operator [](int i) const { return _mtx[i]; }

    /// Hash.
    friend inline size_t hash_value(GfMatrix2f const &m) {
        int nElems = 2 * 2;
        size_t h = 0;
        const float *p = m.GetArray();
        while (nElems--)
            boost::hash_combine(h, *p++);
        return h;
    }        

    /// Tests for element-wise matrix equality. All elements must match
    /// exactly for matrices to be considered equal.
    bool operator ==(const GfMatrix2d& m) const;

    /// Tests for element-wise matrix equality. All elements must match
    /// exactly for matrices to be considered equal.
    bool operator ==(const GfMatrix2f& m) const;

    /// Tests for element-wise matrix inequality. All elements must match
    /// exactly for matrices to be considered equal.
    bool operator !=(const GfMatrix2d& m) const {
        return !(*this == m);
    }

    /// Tests for element-wise matrix inequality. All elements must match
    /// exactly for matrices to be considered equal.
    bool operator !=(const GfMatrix2f& m) const {
        return !(*this == m);
    }

    /// Returns the transpose of the matrix.
    GfMatrix2f GetTranspose() const;

    /// Returns the inverse of the matrix, or FLT_MAX * SetIdentity() if the
    /// matrix is singular. (FLT_MAX is the largest value a \c float can have, 
    /// as defined by the system.) The matrix is considered singular if the 
    /// determinant is less than or equal to the optional parameter \e eps.
    /// If \e det is non-null, <c>*det</c> is set to the determinant.
    GfMatrix2f GetInverse(double* det = NULL, double eps = 0) const;

    /// Returns the determinant of the matrix.
    double GetDeterminant() const;


    /// Post-multiplies matrix \e m into this matrix.
    GfMatrix2f& operator *=(const GfMatrix2f& m);

    /// Multiplies the matrix by a float.
    GfMatrix2f& operator *=(double);

    ///
    // Returns the product of a matrix and a float.
    friend GfMatrix2f operator *(const GfMatrix2f& m1, double d)
    {
	GfMatrix2f m = m1;
	return m *= d;
    }

    ///
    // Returns the product of a matrix and a float.
    friend GfMatrix2f operator *(double d, const GfMatrix2f& m)
    {
        return m * d;
    }

    /// Adds matrix \e m to this matrix.
    GfMatrix2f& operator +=(const GfMatrix2f& m);

    /// Subtracts matrix \e m from this matrix.
    GfMatrix2f& operator -=(const GfMatrix2f& m);

    /// Returns the unary negation of matrix \e m.
    friend GfMatrix2f operator -(const GfMatrix2f& m);

    /// Adds matrix \e m2 to \e m1
    friend GfMatrix2f operator +(const GfMatrix2f& m1, const GfMatrix2f& m2)
    {
        GfMatrix2f tmp(m1);
        tmp += m2;
        return tmp;
    }

    /// Subtracts matrix \e m2 from \e m1
    friend GfMatrix2f operator -(const GfMatrix2f& m1, const GfMatrix2f& m2)
    {
        GfMatrix2f tmp(m1);
        tmp -= m2;
        return tmp;
    }
    
    /// Multiplies matrix \e m1 by \e m2
    friend GfMatrix2f operator *(const GfMatrix2f& m1, const GfMatrix2f& m2)
    {
        GfMatrix2f tmp(m1);
        tmp *= m2;
        return tmp;
    }

    /// Divides matrix \e m1 by \e m2 (that is, <c>m1 * inv(m2)</c>).
    friend GfMatrix2f operator /(const GfMatrix2f& m1, const GfMatrix2f& m2)
    {
        return(m1 * m2.GetInverse());
    }

    /// Returns the product of a matrix \e m and a column vector \e vec.
    friend inline GfVec2f operator *(const GfMatrix2f& m, const GfVec2f& vec) {
        return GfVec2f(vec[0] * m._mtx[0][0] + vec[1] * m._mtx[0][1],
                       vec[0] * m._mtx[1][0] + vec[1] * m._mtx[1][1]);
    }

    /// Returns the product of row vector \e vec and a matrix \e m.
    friend inline GfVec2f operator *(const GfVec2f &vec, const GfMatrix2f& m) {
        return GfVec2f(vec[0] * m._mtx[0][0] + vec[1] * m._mtx[1][0],
                       vec[0] * m._mtx[0][1] + vec[1] * m._mtx[1][1]);
    }


private:
    /// Matrix storage, in row-major order.
    GfMatrixData<float, 2, 2> _mtx;

    // Friend declarations
    friend class GfMatrix2d;
};

/// Output a GfMatrix2f
/// \ingroup group_gf_DebuggingOutput
std::ostream& operator<<(std::ostream &, GfMatrix2f const &);

#endif // GF_MATRIX2F_H
