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git-svn-id: https://lmms.svn.sf.net/svnroot/lmms/trunk/lmms@414 0778d3d1-df1d-0410-868b-ea421aaaa00d
101 lines
1.8 KiB
C++
101 lines
1.8 KiB
C++
/*
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dsp/Roessler.h
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Copyright 2003-4 Tim Goetze <tim@quitte.de>
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http://quitte.de/dsp/
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Roessler fractal.
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*/
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/*
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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02111-1307, USA or point your web browser to http://www.gnu.org.
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*/
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#ifndef _DSP_ROESSLER_H_
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#define _DSP_ROESSLER_H_
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namespace DSP {
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class Roessler
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{
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public:
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double x[2], y[2], z[2];
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double h, a, b, c;
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int I;
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public:
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Roessler()
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{
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h = 0.001;
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a = .2;
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b = .2;
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c = 5.7;
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}
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/* rate is normalized (0 .. 1) */
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void set_rate (double r)
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{
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h = max (.000001, r * .096);
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}
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void init (double _h = .001, double seed = .0)
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{
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h = _h;
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I = 0;
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x[0] = .0001 + .0001 * seed;
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y[0] = .0001;
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z[0] = .0001;
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for (int i = 0; i < 5000; ++i)
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get();
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}
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d_sample get()
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{
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int J = I ^ 1;
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x[J] = x[I] + h * (- y[I] - z[I]);
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y[J] = y[I] + h * (x[I] + a * y[I]);
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z[J] = z[I] + h * (b + z[I] * (x[I] - c));
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I = J;
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return x[I] * .01725 + z[I] * .015;
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}
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double get_x()
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{
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return x[I];
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}
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double get_y()
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{
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return y[I];
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}
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double get_z()
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{
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return z[I];
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}
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};
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} /* namespace DSP */
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#endif /* _DSP_ROESSLER_H_ */
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