/usr/include/libnoise/module/spheres.h is in libnoise-dev 1.0.0+repack-1.
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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_MODULE_SPHERES_H
#define NOISE_MODULE_SPHERES_H
#include "modulebase.h"
namespace noise
{
namespace module
{
/// @addtogroup libnoise
/// @{
/// @addtogroup modules
/// @{
/// @addtogroup generatormodules
/// @{
/// Default frequency value for the noise::module::Spheres noise module.
const double DEFAULT_SPHERES_FREQUENCY = 1.0;
/// Noise module that outputs concentric spheres.
///
/// @image html modulespheres.png
///
/// This noise module outputs concentric spheres centered on the origin
/// like the concentric rings of an onion.
///
/// The first sphere has a radius of 1.0. Each subsequent sphere has a
/// radius that is 1.0 unit larger than the previous sphere.
///
/// The output value from this noise module is determined by the distance
/// between the input value and the the nearest spherical surface. The
/// input values that are located on a spherical surface are given the
/// output value 1.0 and the input values that are equidistant from two
/// spherical surfaces are given the output value -1.0.
///
/// An application can change the frequency of the concentric spheres.
/// Increasing the frequency reduces the distances between spheres. To
/// specify the frequency, call the SetFrequency() method.
///
/// This noise module, modified with some low-frequency, low-power
/// turbulence, is useful for generating agate-like textures.
///
/// This noise module does not require any source modules.
class Spheres: public Module
{
public:
/// Constructor.
///
/// The default frequency is set to
/// noise::module::DEFAULT_SPHERES_FREQUENCY.
Spheres ();
/// Returns the frequency of the concentric spheres.
///
/// @returns The frequency of the concentric spheres.
///
/// Increasing the frequency increases the density of the concentric
/// spheres, reducing the distances between them.
double GetFrequency () const
{
return m_frequency;
}
virtual int GetSourceModuleCount () const
{
return 0;
}
virtual double GetValue (double x, double y, double z) const;
/// Sets the frequenct of the concentric spheres.
///
/// @param frequency The frequency of the concentric spheres.
///
/// Increasing the frequency increases the density of the concentric
/// spheres, reducing the distances between them.
void SetFrequency (double frequency)
{
m_frequency = frequency;
}
protected:
/// Frequency of the concentric spheres.
double m_frequency;
};
/// @}
/// @}
/// @}
}
}
#endif
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