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#ifndef VPYTHON_UTIL_EXTENT_HPP
#define VPYTHON_UTIL_EXTENT_HPP
// Copyright (c) 2000, 2001, 2002, 2003 by David Scherer and others.
// Copyright (c) 2004 by Jonathan Brandmeyer and others.
// See the file license.txt for complete license terms.
// See the file authors.txt for a complete list of contributors.
#include "util/vector.hpp"
#include "util/tmatrix.hpp"
namespace cvisual {
class extent_data {
private:
friend class extent;
double cot_hfov, invsin_hfov, sin_hfov, cos_hfov;
vector mins, maxs;
double camera_z;
size_t buffer_depth; ///< The required depth of the selection buffer.
bool is_empty() const;
public:
extent_data( double tan_hfov );
// The following functions represent the interface for render_surface objects.
/** Returns the center position of the scene in world space. */
vector get_center() const;
/** Returns distance that are nearest and farthest toward center along forward. */
void get_near_and_far( const vector& forward, double& nearest, double& farthest) const;
/** Determines the range that the axes need to be to include the bounding
* box.
*/
vector get_range( vector center) const;
double get_camera_z() const { return camera_z; }
/** Returns the size for the select buffer when rendering in select mode,
* after having traversed the world. */
size_t get_select_buffer_depth() { return buffer_depth; }
};
/** A helper class to determine the extent of the rendered universe in world
space.
*/
class extent
{
private:
extent_data& data;
tmatrix l_cw;
int frame_depth;
public:
extent( extent_data& data, const tmatrix& local_to_centered_world );
extent( extent& parent, const tmatrix& local_to_parent );
~extent(); //< Might be necessary to "flush" local cached results into parent
// The following functions represent the interface for renderable objects.
/** Extend the range to include this point.
@param point a point in world space coordinates.
*/
void add_point( vector point);
/** Extend the range to include this sphere.
@param center The center of the sphere.
@param radius The radius of the bounding sphere.
*/
void add_sphere( vector center, double radius);
/** Extend the range to include the region of local coordinate system
from min to max **/
void add_box( const tmatrix& local_to_world, const vector& min, const vector& max );
/** Extend the range to include this circle */
void add_circle( const vector& center, const vector& normal, double radius );
/** Report the number of bodies that this object represents. This is used
* for the calculation of the hit buffer size.
*/
void add_body();
/** See implementation of frame::grow_extent()
*/
};
} // !namespace cvisual
#endif // !defined VPYTHON_UTIL_EXTENT_HPP
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