mapnik/src/box2d.cpp

/*****************************************************************************
 * 
 * This file is part of Mapnik (c++ mapping toolkit)
 *
 * Copyright (C) 2006 Artem Pavlenko
 *
 * 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
 *
 *****************************************************************************/
//$Id: envelope.cpp 17 2005-03-08 23:58:43Z pavlenko $

#include <mapnik/box2d.hpp>

namespace mapnik
{
template <typename T>
box2d<T>::box2d()
    :minx_(0),miny_(0),maxx_(-1),maxy_(-1) {}

template <typename T>
box2d<T>::box2d(T minx_,T miny_,T maxx_,T maxy_)
{
    init(minx_,miny_,maxx_,maxy_);
}

template <typename T>
box2d<T>::box2d(const coord<T,2> &c0,const coord<T,2> &c1)
{
    init(c0.x,c0.y,c1.x,c1.y);
}

template <typename T>
box2d<T>::box2d(const box2d &rhs)
{
    init(rhs.minx_,rhs.miny_,rhs.maxx_,rhs.maxy_);
}

template <typename T>
#if !defined(__SUNPRO_CC)
inline
#endif
bool box2d<T>::operator==(const box2d<T>& other) const
{
    return minx_==other.minx_ &&
        miny_==other.miny_ &&
        maxx_==other.maxx_ &&
        maxy_==other.maxy_;
}

template <typename T>
#if !defined(__SUNPRO_CC)
inline
#endif
T box2d<T>::minx() const
{
    return minx_;
}

template <typename T>
#if !defined(__SUNPRO_CC)
inline
#endif
T box2d<T>::maxx() const
{
    return maxx_;
}

template <typename T>
#if !defined(__SUNPRO_CC)
inline
#endif
T box2d<T>::miny() const
{
    return miny_;
}

template <typename T>
#if !defined(__SUNPRO_CC)
inline
#endif
T box2d<T>::maxy() const
{
    return maxy_;
}

template <typename T>
#if !defined(__SUNPRO_CC)
inline
#endif
T box2d<T>::width() const
{
    return maxx_-minx_;
}

template <typename T>
#if !defined(__SUNPRO_CC)
inline
#endif
T box2d<T>::height() const
{
    return maxy_-miny_;
}

template <typename T>
#if !defined(__SUNPRO_CC)
inline
#endif
void box2d<T>::width(T w)
{
    T cx=center().x;
    minx_=static_cast<T>(cx-w*0.5);
    maxx_=static_cast<T>(cx+w*0.5);
}

template <typename T>
#if !defined(__SUNPRO_CC)
inline
#endif
void box2d<T>::height(T h)
{
    T cy=center().y;
    miny_=static_cast<T>(cy-h*0.5);
    maxy_=static_cast<T>(cy+h*0.5);
}

template <typename T>
#if !defined(__SUNPRO_CC)
inline
#endif
coord<T,2> box2d<T>::center() const
{
    return coord<T,2>(static_cast<T>(0.5*(minx_+maxx_)),
                      static_cast<T>(0.5*(miny_+maxy_)));
}

template <typename T>
#if !defined(__SUNPRO_CC)
inline
#endif
void box2d<T>::expand_to_include(const coord<T,2>& c)
{
    expand_to_include(c.x,c.y);
}

template <typename T>
#if !defined(__SUNPRO_CC)
inline
#endif
void box2d<T>::expand_to_include(T x,T y)
{
    if (x<minx_) minx_=x;
    if (x>maxx_) maxx_=x;
    if (y<miny_) miny_=y;
    if (y>maxy_) maxy_=y;
}

template <typename T>
void box2d<T>::expand_to_include(const box2d<T> &other)
{
    if (other.minx_<minx_) minx_=other.minx_;
    if (other.maxx_>maxx_) maxx_=other.maxx_;
    if (other.miny_<miny_) miny_=other.miny_;
    if (other.maxy_>maxy_) maxy_=other.maxy_;
}

template <typename T>
#if !defined(__SUNPRO_CC)
inline
#endif
bool box2d<T>::contains(const coord<T,2> &c) const
{
    return contains(c.x,c.y);
}

template <typename T>
#if !defined(__SUNPRO_CC)
inline
#endif
bool box2d<T>::contains(T x,T y) const
{
    return x>=minx_ && x<=maxx_ && y>=miny_ && y<=maxy_;
}

template <typename T>
#if !defined(__SUNPRO_CC)
inline
#endif
bool box2d<T>::contains(const box2d<T> &other) const
{
    return other.minx_>=minx_ &&
        other.maxx_<=maxx_ &&
        other.miny_>=miny_ &&
        other.maxy_<=maxy_;
}

template <typename T>
#if !defined(__SUNPRO_CC)
inline
#endif
bool box2d<T>::intersects(const coord<T,2> &c) const
{
    return intersects(c.x,c.y);
}

template <typename T>
#if !defined(__SUNPRO_CC)
inline
#endif
bool box2d<T>::intersects(T x,T y) const
{
    return !(x>maxx_ || x<minx_ || y>maxy_ || y<miny_);
}

template <typename T>
#if !defined(__SUNPRO_CC)
inline
#endif
bool box2d<T>::intersects(const box2d<T> &other) const
{
    return !(other.minx_>maxx_ || other.maxx_<minx_ ||
             other.miny_>maxy_ || other.maxy_<miny_);
}

template <typename T>
#if !defined(__SUNPRO_CC)
inline
#endif
box2d<T> box2d<T>::intersect(const box2d_type& other) const
{
    if (intersects(other)) {
        T x0=std::max(minx_,other.minx_);
        T y0=std::max(miny_,other.miny_);

        T x1=std::min(maxx_,other.maxx_);
        T y1=std::min(maxy_,other.maxy_);

        return box2d<T>(x0,y0,x1,y1);
    } else {
        return box2d<T>();
    }
}

template <typename T>
#if !defined(__SUNPRO_CC)
inline
#endif
void box2d<T>::re_center(T cx,T cy)
{
    T dx=cx-center().x;
    T dy=cy-center().y;
    minx_+=dx;
    miny_+=dy;
    maxx_+=dx;
    maxy_+=dy;
}

template <typename T>
#if !defined(__SUNPRO_CC)
inline
#endif
void box2d<T>::init(T x0,T y0,T x1,T y1)
{
    if (x0<x1)
    {
        minx_=x0;maxx_=x1;
    }
    else
    {
        minx_=x1;maxx_=x0;
    }
    if (y0<y1)
    {
        miny_=y0;maxy_=y1;
    }
    else
    {
        miny_=y1;maxy_=y0;
    }
}
    
template <typename T>
box2d<T>&  box2d<T>::operator+=(box2d<T> const& other)
{
    expand_to_include(other);
    return *this;
}
    
template <typename T>    
box2d<T>& box2d<T>::operator-=(box2d<T> const& other)
{
    // not sure what to do here. intersect?
    return *this;
}
    
template <typename T>    
box2d<T>& box2d<T>::operator*=(T t)
{
    coord<T,2> c = center();
    T sx = static_cast<T>(0.5 * width()  * t);
    T sy = static_cast<T>(0.5 * height() * t);
    minx_ = c.x - sx;
    maxx_ = c.x + sx;
    miny_ = c.y - sy;
    maxy_ = c.y + sy;
    return *this;
}
   
template <typename T>    
box2d<T>& box2d<T>::operator/=(T t)
{
    coord<T,2> c = center();
    T sx = static_cast<T>(0.5 * width() / t);
    T sy = static_cast<T>(0.5 * height() / t);
    minx_ = c.x - sx;
    maxx_ = c.x + sx;
    miny_ = c.y - sy;
    maxy_ = c.y + sy;
    return *this;
}
    
template class box2d<int>;
template class box2d<double>;
}