72 lines
1.8 KiB
C
72 lines
1.8 KiB
C
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/*
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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 murl_c;
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int murl_power;
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double c, p2, 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("murl");
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// Define the Variables
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APO_VARIABLES(
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VAR_REAL(murl_c, 0.0),
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VAR_INTEGER_RANGE(murl_power, 2, 0x7fffffff, 2),
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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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if (VAR(murl_power) != 1)
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VAR(c) = VAR(murl_c) / (VAR(murl_power) - 1);
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else
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VAR(c) = VAR(murl_c);
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VAR(p2) = VAR(murl_power) / 2.0;
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VAR(vp) = VVAR * (VAR(c) + 1);
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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(murl_power), &sina, &cosa);
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double r = VAR(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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double r1 = VAR(vp) / (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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