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Diffstat (limited to 'chaos/src/lozi_map.hpp')
-rw-r--r-- | chaos/src/lozi_map.hpp | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/chaos/src/lozi_map.hpp b/chaos/src/lozi_map.hpp new file mode 100644 index 0000000..07656d2 --- /dev/null +++ b/chaos/src/lozi_map.hpp @@ -0,0 +1,80 @@ +// +// +// 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" + +// lozi map: x[n+1] = y[n] + 1 - a * abs(x[n]) +// y[n+1] = b * x[n] +// b != 0 +// taken from Willi-Hans Steeb: Chaos and Fractals + +class lozi_map: + public map_base<2> +{ +public: + lozi_map() + { + CHAOS_SYS_INIT(x,0,0); + CHAOS_SYS_INIT(y,0,1); + + CHAOS_PAR_INIT(a,1.4); + CHAOS_PAR_INIT(b,0.3); + } + + void m_step() + { + data_t x = m_data[0]; + data_t y = m_data[1]; + + if (x > 0) + m_data[0] = 1 + y - CHAOS_PARAMETER(a) * x; + else + m_data[0] = 1 + y + CHAOS_PARAMETER(a) * x; + + m_data[1] = CHAOS_PARAMETER(b) * x; + + } + + CHAOS_SYSVAR_FUNCS(x, 0); + CHAOS_SYSVAR_FUNCS(y, 1); + + CHAOS_SYSPAR_FUNCS(a); + + CHAOS_SYSPAR_FUNCS_PRED(b, m_pred_b); + bool m_pred_b(t_float f) + { + return (f != 0); + } +}; + + +#define LOZI_MAP_CALLBACKS \ +MAP_CALLBACKS; \ +CHAOS_SYS_CALLBACKS(a); \ +CHAOS_SYS_CALLBACKS(b); \ +CHAOS_SYS_CALLBACKS(x); \ +CHAOS_SYS_CALLBACKS(y); + +#define LOZI_MAP_ATTRIBUTES \ +MAP_ATTRIBUTES; \ +CHAOS_SYS_ATTRIBUTE(a); \ +CHAOS_SYS_ATTRIBUTE(b); \ +CHAOS_SYS_ATTRIBUTE(x); \ +CHAOS_SYS_ATTRIBUTE(y); |