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/******************************************************************/
/* This file is part of the homework assignments for CSCI-427/527 */
/* at The College of William & Mary and authored by Pieter Peers. */
/* No part of this file, whether altered or in original form, can */
/* be distributed or used outside the context of CSCI-427/527 */
/* without consent of either the College of William & Mary or */
/* Pieter Peers. */
/******************************************************************/
#include <cassert>
#include <algorithm>
#include "mat3d.h"
/////////////////
// Constructor //
/////////////////
mat3d::mat3d(void)
{
clear(0.0f);
}
mat3d::mat3d(mat3d::value_type diag)
: mat3d()
{
setDiagonal(diag);
}
mat3d::mat3d(const vec3d& X, const vec3d& Y, const vec3d& Z)
{
for(size_type i=0; i < 3; i++)
{
this->operator()(i,0) = X[i];
this->operator()(i,1) = Y[i];
this->operator()(i,2) = Z[i];
}
}
mat3d::mat3d(const mat3d& m)
{
_data = m._data;
}
////////////////
// Inspectors //
////////////////
mat3d::iterator mat3d::begin(void)
{
return _data.begin();
}
mat3d::const_iterator mat3d::begin(void) const
{
return _data.begin();
}
mat3d::iterator mat3d::end(void)
{
return _data.end();
}
mat3d::const_iterator mat3d::end(void) const
{
return _data.end();
}
//////////////
// Mutators //
//////////////
void mat3d::clear(mat3d::value_type value)
{
std::fill(begin(), end(), value);
}
void mat3d::setDiagonal(mat3d::value_type value)
{
(*this)(0,0) = (*this)(1,1) = (*this)(2,2) = value;
}
mat3d& mat3d::transpose(void)
{
for(size_type row=0; row < height(); row++)
for(size_type column=row+1; column < width(); column++)
std::swap( (*this)(row,column), (*this)(column,row) );
return *this;
}
///////////////
// Operators //
///////////////
mat3d& mat3d::operator=(const mat3d& m)
{
_assign(m);
return *this;
}
mat3d::reference mat3d::operator()(mat3d::size_type row, mat3d::size_type col)
{
assert(row < height() && col < width());
return _data[ row*width() + col];
}
mat3d::const_reference mat3d::operator()(mat3d::size_type row, mat3d::size_type col) const
{
assert(row < height() && col < width());
return _data[ row*width() + col];
}
mat3d mat3d::operator+(const mat3d& m) const
{
mat3d result;
std::transform(begin(), end(), m.begin(), result.begin(), [](const_reference a, const_reference b)
{
return a+b;
});
return result;
}
mat3d mat3d::operator-(const mat3d& m) const
{
mat3d result;
std::transform(begin(), end(), m.begin(), result.begin(), [](const_reference a, const_reference b)
{
return a-b;
});
return result;
}
mat3d mat3d::operator*(const mat3d& m) const
{
mat3d result;
for(size_type i=0; i < result.height(); i++)
for(size_type j=0; j < result.width(); j++)
for(size_type k=0; k < width(); k++)
result(i,j) += (*this)(i,k) * m(k, j);
return result;
}
vec3d mat3d::operator*(const vec3d& v) const
{
vec3d result;
for(size_type i=0; i < height(); i++)
for(size_type j=0; j < width(); j++)
result[i] += v[j] * (*this)(i,j);
return result;
}
mat3d mat3d::operator*(mat3d::value_type scale) const
{
mat3d result;
std::transform(begin(), end(), result.begin(), [&](const_reference v)
{
return v * scale;
});
return result;
}
mat3d mat3d::operator/(mat3d::value_type scale) const
{
mat3d result;
std::transform(begin(), end(), result.begin(), [&](const_reference v)
{
return v / scale;
});
return result;
}
mat3d& mat3d::operator+=(const mat3d& m)
{
std::transform(begin(), end(), m.begin(), begin(), [](const_reference a, const_reference b)
{
return a+b;
});
return *this;
}
mat3d& mat3d::operator-=(const mat3d& m)
{
std::transform(begin(), end(), m.begin(), begin(), [](const_reference a, const_reference b)
{
return a-b;
});
return *this;
}
mat3d& mat3d::operator*=(const mat3d& m)
{
*this = *this * m;
return *this;
}
mat3d& mat3d::operator*=(mat3d::value_type scale)
{
std::for_each(begin(), end(), [&](reference v)
{
v *= scale;
});
return *this;
}
mat3d& mat3d::operator/=(mat3d::value_type scale)
{
std::for_each(begin(), end(), [&](reference v)
{
v /= scale;
});
return *this;
}
/////////////////////
// Private Methods //
/////////////////////
void mat3d::_swap(mat3d& m)
{
if(&m == this) return;
std::swap(_data, m._data);
}
void mat3d::_assign(const mat3d& m)
{
if(&m == this) return;
_data = m._data;
}
vec3d mat3d::_premultiply(const vec3d& v) const
{
// result = v * *this
vec3d result;
for(size_type i=0; i < height(); i++)
for(size_type j=0; j < width(); j++)
result[j] += v[i] * (*this)(i,j);
return result;
}
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