1 files changed, 121 insertions, 0 deletions
diff --git a/chaos/src/henon_map.hpp b/chaos/src/henon_map.hpp
new file mode 100644
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+++ b/chaos/src/henon_map.hpp
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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"
+
+//  henon map: x[n+1] = y[n] + 1 - a * x[n] * x[n]
+//             y[n+1] = b * x[n]
+//             b != 0  
+//  taken from Willi-Hans Steeb: Chaos and Fractals
+
+class henon:
+	protected map_base
+{
+public:
+	henon()
+		: m_a(1.4), m_b(0.3)
+	{
+		m_num_eq = 2;
+		m_data = new data_t[1];
+		set_x(0.f);
+		set_y(0.f);
+	}
+
+	~henon()
+	{
+		delete m_data;
+	}
+
+	virtual void m_step()
+	{
+		data_t x = m_data[0];
+		data_t y = m_data[1];
+		
+		m_data[0] = 1 + y - m_a * x * x;
+		m_data[1] = m_b * x;
+		
+	}
+	
+
+	void set_x(t_float f)
+	{
+		m_data[0] = (data_t) f;
+	}
+
+	t_float get_x()
+	{
+		return (t_float)m_data[0];
+	}
+
+
+	void set_y(t_float f)
+	{
+		m_data[1] = (data_t) f;
+	}
+
+	t_float get_y()
+	{
+		return (t_float)m_data[1];
+	}
+
+
+	void set_a(t_float f)
+	{
+		m_a = (data_t) f;
+	}
+
+	t_float get_a()
+	{
+		return (t_float)m_a;
+	}
+
+
+	void set_b(t_float f)
+	{
+		if (f != 0)
+			m_b = (data_t) f;
+		else
+			post("value for b %f out of range", f);
+	}
+
+	t_float get_b()
+	{
+		return (t_float)m_b;
+	}
+
+private:
+	data_t m_a;
+	data_t m_b;
+};
+
+
+#define HENON_CALLBACKS								\
+MAP_CALLBACKS;										\
+FLEXT_CALLVAR_F(m_system->get_a, m_system->set_a);	\
+FLEXT_CALLVAR_F(m_system->get_b, m_system->set_b);	\
+FLEXT_CALLVAR_F(m_system->get_x, m_system->set_x);	\
+FLEXT_CALLVAR_F(m_system->get_y, m_system->set_y);
+
+#define HENON_ATTRIBUTES									\
+MAP_ATTRIBUTES;												\
+FLEXT_ADDATTR_VAR("a",m_system->get_a, m_system->set_a);	\
+FLEXT_ADDATTR_VAR("b",m_system->get_b, m_system->set_b);	\
+FLEXT_ADDATTR_VAR("x",m_system->get_x, m_system->set_x);	\
+FLEXT_ADDATTR_VAR("y",m_system->get_y, m_system->set_y);