1 files changed, 130 insertions, 0 deletions
diff --git a/chaos/src/standard_map.hpp b/chaos/src/standard_map.hpp
new file mode 100644
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+++ b/chaos/src/standard_map.hpp
@@ -0,0 +1,130 @@
+// 
+//  
+//  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"
+#include <cmath>
+
+//  standard map: I[n+1] = I[n] + k * sin(theta[n])
+//                theta[n+1] = theta[n] + I[n] + k * sin(theta[n])
+//                0 <= theta <= 2*pi
+//  taken from Willi-Hans Steeb: Chaos and Fractals
+
+class standard:
+	protected map_base
+{
+public:
+	standard()
+		: m_k(0.8)
+	{
+		m_num_eq = 2;
+		m_data = new data_t[2];
+		set_I(0.1);
+		set_theta(0.2);
+	}
+
+	~standard()
+	{
+		delete m_data;
+	}
+
+	virtual void m_step()
+	{
+		data_t I = m_data[0];
+		data_t theta = m_data[1];
+		
+		m_data[0] = I + m_k * sin(theta);
+		theta = theta + I + k * sin(theta);
+
+		if (y > 2 * M_PI)
+		{
+			do
+			{
+				y -= 2*M_PI;
+			}
+			while (y > 2 * M_PI);
+			goto put_data;
+		}
+		
+		if (y < 0)
+		{
+			do
+			{
+				y += 2*M_PI;
+			}
+			while (y < 0);
+		}
+		
+	put_data:
+		m_data[1] = theta;
+	}
+
+
+	void set_I(t_float f)
+	{
+		m_data[0] = (data_t) f;
+	}
+
+	t_float get_I()
+	{
+		return (t_float)m_data[0];
+	}
+
+
+	void set_theta(t_float f)
+	{
+		if ( (f >= 0) && (f < 2*M_PI))
+			m_data[1] = (data_t) f;
+		else
+			post("value for theta %f out of range", f);
+	}
+
+	t_float get_theta()
+	{
+		return (t_float)m_data[1];
+	}
+
+
+	void set_k(t_float f)
+	{
+		m_k = (data_t) f;
+	}
+
+	t_float get_k()
+	{
+		return (t_float)m_k;
+	}
+
+private:	
+	data_t m_k;
+};
+
+
+#define STANDARD_CALLBACKS									\
+MAP_CALLBACKS;												\
+FLEXT_CALLVAR_F(m_system->get_I, m_system->set_I);			\
+FLEXT_CALLVAR_F(m_system->get_theta, m_system->set_theta);	\
+FLEXT_CALLVAR_F(m_system->get_k, m_system->set_k);
+
+
+#define STANDARD_ATTRIBUTES												\
+MAP_ATTRIBUTES;															\
+FLEXT_ADDATTR_VAR("I",m_system->get_I, m_system->set_I);				\
+FLEXT_ADDATTR_VAR("theta",m_system->get_theta, m_system->set_theta);	\
+FLEXT_ADDATTR_VAR("k",m_system->get_k, m_system->set_k);