95a2f54683
git-svn-id: https://svn.code.sf.net/p/apophysis7x/svn/trunk@1 a5d1c0f9-a0e9-45c6-87dd-9d276e40c949
66 lines
2.2 KiB
C
66 lines
2.2 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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typedef struct
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{
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double npolar_vvar;
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double npolar_vvar_2;
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int npolar_n;
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int npolar_nnz;
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int npolar_parity;
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int npolar_isodd;
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double npolar_cn;
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double npolar_absn;
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} Variables;
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#define _USE_MATH_DEFINES
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#include "apoplugin.h"
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APO_PLUGIN("npolar");
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APO_VARIABLES(
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VAR_INTEGER(npolar_parity, 0),
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VAR_INTEGER(npolar_n, 1)
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);
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int PluginVarPrepare(Variation* vp)
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{
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VAR(npolar_nnz) = (VAR(npolar_n) == 0) ? 1 : VAR(npolar_n);
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VAR(npolar_vvar) = VVAR / M_PI;
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VAR(npolar_vvar_2) = VAR(npolar_vvar) * 0.5;
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VAR(npolar_absn) = abs(VAR(npolar_nnz));
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VAR(npolar_cn) = 1.0 / VAR(npolar_nnz) / 2;
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VAR(npolar_isodd) = abs(VAR(npolar_parity)) % 2;
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return TRUE;
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}
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int PluginVarCalc(Variation* vp)
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{
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double sina = 0.0, cosa = 0.0;
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double x = (VAR(npolar_isodd) != 0) ? FTx : VAR(npolar_vvar) * atan2(FTx, FTy);
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double y = (VAR(npolar_isodd) != 0) ? FTy : VAR(npolar_vvar_2) * log(FTx*FTx + FTy*FTy);
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double angle = (atan2(y, x) + M_2PI * (rand() % (int)VAR(npolar_absn)))/ VAR(npolar_nnz);
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double r = VVAR * pow(sqr(x) + sqr(y), VAR(npolar_cn)) * ((VAR(npolar_isodd) == 0) ? 1.0 : VAR(npolar_parity));
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fsincos(angle, &sina, &cosa); cosa *= r; sina *= r;
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x = (VAR(npolar_isodd) != 0) ? cosa : (VAR(npolar_vvar_2) * log(cosa*cosa + sina*sina));
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y = (VAR(npolar_isodd) != 0) ? sina : (VAR(npolar_vvar) * atan2(cosa, sina));
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FPx += x; FPy += y;
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return TRUE;
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}
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