/usr/include/libnoise/model/sphere.h is in libnoise-dev 1.0.0+nmu1.
This file is owned by root:root, with mode 0o644.
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//
// Copyright (C) 2003, 2004 Jason Bevins
//
// 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 (COPYING.txt) 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
//
// The developer's email is jlbezigvins@gmzigail.com (for great email, take
// off every 'zig'.)
//
#ifndef NOISE_MODEL_SPHERE_H
#define NOISE_MODEL_SPHERE_H
#include <assert.h>
#include "../module/modulebase.h"
namespace noise
{
namespace model
{
/// @addtogroup libnoise
/// @{
/// @addtogroup models
/// @{
/// Model that defines the surface of a sphere.
///
/// @image html modelsphere.png
///
/// This model returns an output value from a noise module given the
/// coordinates of an input value located on the surface of a sphere.
///
/// To generate an output value, pass the (latitude, longitude)
/// coordinates of an input value to the GetValue() method.
///
/// This model is useful for creating:
/// - seamless textures that can be mapped onto a sphere
/// - terrain height maps for entire planets
///
/// This sphere has a radius of 1.0 unit and its center is located at
/// the origin.
class Sphere
{
public:
/// Constructor.
Sphere ();
/// Constructor
///
/// @param module The noise module that is used to generate the output
/// values.
Sphere (const module::Module& module);
/// Returns the noise module that is used to generate the output
/// values.
///
/// @returns A reference to the noise module.
///
/// @pre A noise module was passed to the SetModule() method.
const module::Module& GetModule () const
{
assert (m_pModule != NULL);
return *m_pModule;
}
/// Returns the output value from the noise module given the
/// (latitude, longitude) coordinates of the specified input value
/// located on the surface of the sphere.
///
/// @param lat The latitude of the input value, in degrees.
/// @param lon The longitude of the input value, in degrees.
///
/// @returns The output value from the noise module.
///
/// @pre A noise module was passed to the SetModule() method.
///
/// This output value is generated by the noise module passed to the
/// SetModule() method.
///
/// Use a negative latitude if the input value is located on the
/// southern hemisphere.
///
/// Use a negative longitude if the input value is located on the
/// western hemisphere.
double GetValue (double lat, double lon) const;
/// Sets the noise module that is used to generate the output values.
///
/// @param module The noise module that is used to generate the output
/// values.
///
/// This noise module must exist for the lifetime of this object,
/// until you pass a new noise module to this method.
void SetModule (const module::Module& module)
{
m_pModule = &module;
}
private:
/// A pointer to the noise module used to generate the output values.
const module::Module* m_pModule;
};
/// @}
/// @}
}
}
#endif
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