66 lines
2.2 KiB
C
66 lines
2.2 KiB
C
|
/*
|
||
|
|
Apophysis Plugin
|
||
|
|
|
||
|
|
This program is free software; you can redistribute it and/or modify
|
||
|
|
it under the terms of the GNU General Public License as published by
|
||
|
|
the Free Software Foundation; either version 2 of the License, or
|
||
|
|
(at your option) any later version.
|
||
|
|
|
||
|
|
This program is distributed in the hope that it will be useful,
|
||
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
|
|
GNU General Public License for more details.
|
||
|
|
|
||
|
|
You should have received a copy of the GNU General Public License
|
||
|
|
along with this program; if not, write to the Free Software
|
||
|
|
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
||
|
|
*/
|
||
|
|
|
||
|
|
typedef struct
|
||
|
|
{
|
||
|
|
double npolar_vvar;
|
||
|
|
double npolar_vvar_2;
|
||
|
|
|
||
|
|
int npolar_n;
|
||
|
|
int npolar_nnz;
|
||
|
|
int npolar_parity;
|
||
|
|
int npolar_isodd;
|
||
|
|
|
||
|
|
double npolar_cn;
|
||
|
|
double npolar_absn;
|
||
|
|
} Variables;
|
||
|
|
|
||
|
|
#define _USE_MATH_DEFINES
|
||
|
|
#include "apoplugin.h"
|
||
|
|
APO_PLUGIN("npolar");
|
||
|
|
APO_VARIABLES(
|
||
|
|
VAR_INTEGER(npolar_parity, 0),
|
||
|
|
VAR_INTEGER(npolar_n, 1)
|
||
|
|
);
|
||
|
|
|
||
|
|
int PluginVarPrepare(Variation* vp)
|
||
|
|
{
|
||
|
|
VAR(npolar_nnz) = (VAR(npolar_n) == 0) ? 1 : VAR(npolar_n);
|
||
|
|
VAR(npolar_vvar) = VVAR / M_PI;
|
||
|
|
VAR(npolar_vvar_2) = VAR(npolar_vvar) * 0.5;
|
||
|
|
VAR(npolar_absn) = abs(VAR(npolar_nnz));
|
||
|
|
VAR(npolar_cn) = 1.0 / VAR(npolar_nnz) / 2;
|
||
|
|
VAR(npolar_isodd) = abs(VAR(npolar_parity)) % 2;
|
||
|
|
return TRUE;
|
||
|
|
}
|
||
|
|
int PluginVarCalc(Variation* vp)
|
||
|
|
{
|
||
|
|
double sina = 0.0, cosa = 0.0;
|
||
|
|
double x = (VAR(npolar_isodd) != 0) ? FTx : VAR(npolar_vvar) * atan2(FTx, FTy);
|
||
|
|
double y = (VAR(npolar_isodd) != 0) ? FTy : VAR(npolar_vvar_2) * log(FTx*FTx + FTy*FTy);
|
||
|
|
double angle = (atan2(y, x) + M_2PI * (rand() % (int)VAR(npolar_absn)))/ VAR(npolar_nnz);
|
||
|
|
double r = VVAR * pow(sqr(x) + sqr(y), VAR(npolar_cn)) * ((VAR(npolar_isodd) == 0) ? 1.0 : VAR(npolar_parity));
|
||
|
|
|
||
|
|
fsincos(angle, &sina, &cosa); cosa *= r; sina *= r;
|
||
|
|
x = (VAR(npolar_isodd) != 0) ? cosa : (VAR(npolar_vvar_2) * log(cosa*cosa + sina*sina));
|
||
|
|
y = (VAR(npolar_isodd) != 0) ? sina : (VAR(npolar_vvar) * atan2(cosa, sina));
|
||
|
|
FPx += x; FPy += y;
|
||
|
|
|
||
|
|
return TRUE;
|
||
|
|
}
|