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//
//
// chaos~
// Copyright (C) 2004 Tim Blechmann
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; see the file COPYING. If not, write to
// the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
// Boston, MA 02111-1307, USA.
#include "map_base.hpp"
// bungalow_tent map: x[n+1] = 1 + 2 * r + 2 * (r + 1) * x[n]
// (for -1 <= x[n] < -0.5f)
// 1 + 2 * (1 - r) * (x[n])
// (for -0.5 <= x[n] < 0)
// 1 + 2 * (r - 1) * (x[n])
// (for 0 <= x[n] < 0.5)
// 1 + 2 * r - 2 * (r + 1) * (x[n])
// (for 0.5 <= x[n] < 1)
// -1 <= x[n] < 1
// -0.5 <= r < 1
// taken from Willi-Hans Steeb: Chaos and Fractals
class bungalow_tent:
public map_base
{
public:
bungalow_tent()
{
m_num_eq = 1;
m_data = new data_t[m_num_eq];
CHAOS_SYS_INIT(x, 0.6);
CHAOS_SYS_INIT(r, 0.5);
}
~bungalow_tent()
{
delete m_data;
}
virtual void m_step()
{
data_t x = m_data[0];
data_t r = CHAOS_PARAMETER(r);
if ( x < - 0.5)
{
m_data[0] = 1 + 2 * r + 2 * (r + 1) * x;
return;
}
if ( x < 0)
{
m_data[0] = 1 + 2 * (1 - r) * x;
return;
}
if ( x < 0.5)
{
m_data[0] = 1 + 2 * (r - 1) * x;
return;
}
else
{
m_data[0] = 1 + 2 * r - 2 * (r + 1) * x;
return;
}
}
CHAOS_SYSVAR_FUNCS_PRED(x, 0, m_pred_x);
bool m_pred_x(t_float f)
{
return (f >= -1) && (f < 1);
}
CHAOS_SYSPAR_FUNCS_PRED(r, m_pred_r);
bool m_pred_r(t_float f)
{
return (f >= -0.5) && (f < 1);
}
};
#define BUNGALOW_TENT_CALLBACKS \
MAP_CALLBACKS; \
CHAOS_SYS_CALLBACKS(x); \
CHAOS_SYS_CALLBACKS(r);
#define BUNGALOW_TENT_ATTRIBUTES \
MAP_ATTRIBUTES; \
CHAOS_SYS_ATTRIBUTE(x) \
CHAOS_SYS_ATTRIBUTE(r)
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