55 lines
1.5 KiB
C
55 lines
1.5 KiB
C
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/*
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Apophysis Plugin
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Copyright (C) 2007-2009 Joel Faber
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Copyright (C) 2007-2009 Michael Faber
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(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., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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// Must define this structure before we include apoplugin.h
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typedef struct
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{
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double v;
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} Variables;
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#define _USE_MATH_DEFINES
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#define APO_NOVARIABLES
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#define APO_VIRTUALVAR
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#include "apoplugin.h"
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// Set the name of this plugin
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APO_PLUGIN("butterfly");
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// You must call the argument "vp".
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int PluginVarPrepare(Variation* vp)
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{
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VAR(v) = VVAR * 4.0 / sqrt(3.0 * M_PI);
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// Always return TRUE.
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return TRUE;
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}
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// You must call the argument "vp".
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int PluginVarCalc(Variation* vp)
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{
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double y2 = FTy * 2.0;
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double r = VAR(v) * sqrt(fabs(FTy * FTx)/(EPS + sqr(FTx) + sqr(y2)));
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FPx += r * FTx;
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FPy += r * y2;
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return TRUE;
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}
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