/usr/include/claw/impl/line_2d.tpp is in libclaw-dev 1.7.4-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 | /*
CLAW - a C++ Library Absolutely Wonderful
CLAW is a free library without any particular aim but being useful to
anyone.
Copyright (C) 2005-2011 Julien Jorge
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
contact: julien.jorge@gamned.org
*/
/**
* \file line_2d.tpp
* \brief Implementation of claw::math::line_2d class.
* \author Julien Jorge
*/
/*----------------------------------------------------------------------------*/
/**
* \brief Constructor.
*/
template<class T>
claw::math::line_2d<T>::line_2d()
{
} // line_2d::line_2d() [constructor]
/*----------------------------------------------------------------------------*/
/**
* \brief Constructor.
* \param that Line to copy from.
*/
template<class T>
template<class U>
claw::math::line_2d<T>::line_2d( const line_2d<U>& that )
: origin(that.origin), direction(that.direction)
{
} // line_2d::line_2d() [copy constructor]
/*----------------------------------------------------------------------------*/
/**
* \brief Constructor with initializations.
* \param _origin A point on the line.
* \param _direction The direction of the line.
*/
template<class T>
claw::math::line_2d<T>::line_2d
( const point_type& _origin, const direction_type& _direction )
: origin(_origin), direction(_direction)
{
} // line_2d::line_2d() [constructor with values]
/*----------------------------------------------------------------------------*/
/**
* \brief Constructor with initializations.
* \param ox X-coordinate of the origin.
* \param oy Y-coordinate of the origin.
* \param dx X direction of the line.
* \param dy Y direction of the line.
*/
template<class T>
claw::math::line_2d<T>::line_2d( const value_type& ox, const value_type& oy,
const value_type& dx, const value_type& dy )
: origin(ox, oy), direction(dx, dy)
{
} // line_2d::line_2d() [constructor with detailed origin & direction]
/*----------------------------------------------------------------------------*/
/**
* \brief Tell if two lines are parallels.
* \param that The other line.
*/
template<class T>
bool claw::math::line_2d<T>::parallel( const self_type& that ) const
{
return !( (direction.x * that.direction.y)
- (that.direction.x * direction.y) );
} // line_2d::parallel()
/*----------------------------------------------------------------------------*/
/**
* \brief Tell if two lines are orthogonal.
* \param that The other line.
*/
template<class T>
bool claw::math::line_2d<T>::orthogonal( const self_type& that ) const
{
return !( direction.dot_product( that.direction ) );
} // line_2d::orthogonal()
/*----------------------------------------------------------------------------*/
/**
* \brief Get the point at the intersection of two lines.
* \param that The other line.
* \remark The result if unknow if the two lines are parallel.
*/
template<class T>
typename claw::math::line_2d<T>::point_type
claw::math::line_2d<T>::intersection( const self_type& that ) const
{
point_type result;
if ( ! parallel( that ) )
{
point_type delta( that.origin - origin );
value_type n, m;
n = direction.x * delta.y - direction.y * delta.x;
m = that.direction.x * direction.y - direction.x * that.direction.y;
result.x = that.origin.x + (n * that.direction.x) / m;
result.y = that.origin.y + (n * that.direction.y) / m;
}
return result;
} // line_2d::intersection()
/*----------------------------------------------------------------------------*/
/**
* \brief Get the y value of the point of the line at position \a x.
* \param x The X-coordinate for which we want the Y-coordinate.
*/
template<class T>
typename claw::math::line_2d<T>::value_type
claw::math::line_2d<T>::y_value( const value_type& x ) const
{
return (direction.y * (x - origin.x) + direction.x * origin.y) / direction.x;
} // line_2d::y_value()
|