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// Boost.Geometry Index
//
// R-tree OpenGL drawing visitor implementation
//
// Copyright (c) 2011-2013 Adam Wulkiewicz, Lodz, Poland.
//
// Use, modification and distribution is subject to the Boost Software License,
// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
#ifndef BOOST_GEOMETRY_INDEX_DETAIL_RTREE_UTILITIES_GL_DRAW_HPP
#define BOOST_GEOMETRY_INDEX_DETAIL_RTREE_UTILITIES_GL_DRAW_HPP
namespace boost { namespace geometry { namespace index { namespace detail {
namespace utilities {
namespace dispatch {
template <typename Point, size_t Dimension>
struct gl_draw_point
{};
template <typename Point>
struct gl_draw_point<Point, 2>
{
static inline void apply(Point const& p, typename coordinate_type<Point>::type z)
{
glBegin(GL_POINT);
glVertex3f(geometry::get<0>(p), geometry::get<1>(p), z);
glEnd();
}
};
template <typename Box, size_t Dimension>
struct gl_draw_box
{};
template <typename Box>
struct gl_draw_box<Box, 2>
{
static inline void apply(Box const& b, typename coordinate_type<Box>::type z)
{
glBegin(GL_LINE_LOOP);
glVertex3f(geometry::get<min_corner, 0>(b), geometry::get<min_corner, 1>(b), z);
glVertex3f(geometry::get<max_corner, 0>(b), geometry::get<min_corner, 1>(b), z);
glVertex3f(geometry::get<max_corner, 0>(b), geometry::get<max_corner, 1>(b), z);
glVertex3f(geometry::get<min_corner, 0>(b), geometry::get<max_corner, 1>(b), z);
glEnd();
}
};
template <typename Indexable, typename Tag>
struct gl_draw_indexable
{
};
template <typename Indexable>
struct gl_draw_indexable<Indexable, box_tag>
{
static const size_t dimension = geometry::dimension<Indexable>::value;
static inline void apply(Indexable const& i, typename coordinate_type<Indexable>::type z)
{
gl_draw_box<Indexable, dimension>::apply(i, z);
}
};
template <typename Indexable>
struct gl_draw_indexable<Indexable, point_tag>
{
static const size_t dimension = geometry::dimension<Indexable>::value;
static inline void apply(Indexable const& i, typename coordinate_type<Indexable>::type z)
{
gl_draw_point<Indexable, dimension>::apply(i, z);
}
};
} // namespace dispatch
template <typename Indexable> inline
void gl_draw_indexable(Indexable const& i, typename coordinate_type<Indexable>::type z)
{
dispatch::gl_draw_indexable<
Indexable,
typename tag<Indexable>::type
>::apply(i, z);
}
} // namespace utilities
namespace rtree { namespace utilities {
namespace visitors {
template <typename Value, typename Options, typename Translator, typename Box, typename Allocators>
struct gl_draw : public rtree::visitor<Value, typename Options::parameters_type, Box, Allocators, typename Options::node_tag, true>::type
{
typedef typename rtree::internal_node<Value, typename Options::parameters_type, Box, Allocators, typename Options::node_tag>::type internal_node;
typedef typename rtree::leaf<Value, typename Options::parameters_type, Box, Allocators, typename Options::node_tag>::type leaf;
inline gl_draw(Translator const& t,
size_t level_first = 0,
size_t level_last = (std::numeric_limits<size_t>::max)(),
typename coordinate_type<Box>::type z_coord_level_multiplier = 1
)
: tr(t)
, level_f(level_first)
, level_l(level_last)
, z_mul(z_coord_level_multiplier)
, level(0)
{}
inline void operator()(internal_node const& n)
{
typedef typename rtree::elements_type<internal_node>::type elements_type;
elements_type const& elements = rtree::elements(n);
if ( level_f <= level )
{
size_t level_rel = level - level_f;
if ( level_rel == 0 )
glColor3f(0.75f, 0.0f, 0.0f);
else if ( level_rel == 1 )
glColor3f(0.0f, 0.75f, 0.0f);
else if ( level_rel == 2 )
glColor3f(0.0f, 0.0f, 0.75f);
else if ( level_rel == 3 )
glColor3f(0.75f, 0.75f, 0.0f);
else if ( level_rel == 4 )
glColor3f(0.75f, 0.0f, 0.75f);
else if ( level_rel == 5 )
glColor3f(0.0f, 0.75f, 0.75f);
else
glColor3f(0.5f, 0.5f, 0.5f);
for (typename elements_type::const_iterator it = elements.begin();
it != elements.end(); ++it)
{
detail::utilities::gl_draw_indexable(it->first, level_rel * z_mul);
}
}
size_t level_backup = level;
++level;
if ( level < level_l )
{
for (typename elements_type::const_iterator it = elements.begin();
it != elements.end(); ++it)
{
rtree::apply_visitor(*this, *it->second);
}
}
level = level_backup;
}
inline void operator()(leaf const& n)
{
typedef typename rtree::elements_type<leaf>::type elements_type;
elements_type const& elements = rtree::elements(n);
if ( level_f <= level )
{
size_t level_rel = level - level_f;
glColor3f(0.25f, 0.25f, 0.25f);
for (typename elements_type::const_iterator it = elements.begin();
it != elements.end(); ++it)
{
detail::utilities::gl_draw_indexable(tr(*it), level_rel * z_mul);
}
}
}
Translator const& tr;
size_t level_f;
size_t level_l;
typename coordinate_type<Box>::type z_mul;
size_t level;
};
} // namespace visitors
template <typename Rtree> inline
void gl_draw(Rtree const& tree,
size_t level_first = 0,
size_t level_last = (std::numeric_limits<size_t>::max)(),
typename coordinate_type<
typename Rtree::bounds_type
>::type z_coord_level_multiplier = 1
)
{
typedef utilities::view<Rtree> RTV;
RTV rtv(tree);
if ( !tree.empty() )
{
glColor3f(0.75f, 0.75f, 0.75f);
detail::utilities::gl_draw_indexable(tree.bounds(), 0);
}
visitors::gl_draw<
typename RTV::value_type,
typename RTV::options_type,
typename RTV::translator_type,
typename RTV::box_type,
typename RTV::allocators_type
> gl_draw_v(rtv.translator(), level_first, level_last, z_coord_level_multiplier);
rtv.apply_visitor(gl_draw_v);
}
}} // namespace rtree::utilities
}}}} // namespace boost::geometry::index::detail
#endif // BOOST_GEOMETRY_INDEX_DETAIL_RTREE_UTILITIES_GL_DRAW_HPP
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