95a2f54683
git-svn-id: https://svn.code.sf.net/p/apophysis7x/svn/trunk@1 a5d1c0f9-a0e9-45c6-87dd-9d276e40c949
76 lines
2.1 KiB
C
76 lines
2.1 KiB
C
/*
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Apophysis Plugin
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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 murl2_c;
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int murl2_power;
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double p2, invp, invp2, vp;
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} Variables;
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#include "apoplugin.h"
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// Set the name of this plugin
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APO_PLUGIN("murl2");
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// Define the Variables
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APO_VARIABLES(
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VAR_REAL_RANGE(murl2_c, -1.0, 1.0, 0.0),
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VAR_INTEGER_NONZERO(murl2_power, 1),
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);
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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(p2) = VAR(murl2_power) / 2.0;
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VAR(invp) = 1.0 / VAR(murl2_power); // (2/p)/2
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VAR(invp2) = 2.0 / VAR(murl2_power);
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if (VAR(murl2_c) == -1) VAR(vp) = 0; else
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VAR(vp) = VVAR * pow(VAR(murl2_c) + 1, 2.0 / VAR(murl2_power));
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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 sina, cosa;
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fsincos(atan2(FTy, FTx) * VAR(murl2_power), &sina, &cosa);
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double r = VAR(murl2_c) * pow(sqr(FTx) + sqr(FTy), VAR(p2));
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double re = r*cosa + 1;
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double im = r*sina;
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r = pow(sqr(re) + sqr(im), VAR(invp));
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fsincos(atan2(im, re) * VAR(invp2), &sina, &cosa);
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re = r * cosa;
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im = r * sina;
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double r1 = VAR(vp) / sqr(r); //(sqr(re) + sqr(im));
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FPx += r1 * (FTx*re + FTy*im);
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FPy += r1 * (FTy*re - FTx*im);
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return TRUE;
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}
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