85 lines
2.4 KiB
C
85 lines
2.4 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 cpow2_r, cpow2_a;
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int cpow2_divisor;
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int cpow2_spread;
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double c, half_c;
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double d, half_d;
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double ang;
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double inv_spread, full_spread;
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} Variables;
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#define _USE_MATH_DEFINES
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#include "apoplugin.h"
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// Set the name of this plugin
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APO_PLUGIN("cpow2");
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// Define the Variables
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APO_VARIABLES(
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VAR_REAL(cpow2_r, 1.0),
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VAR_REAL(cpow2_a, 0.0),
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VAR_INTEGER_NONZERO(cpow2_divisor, 1),
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VAR_INTEGER_RANGE(cpow2_spread, 1, 0x7fffffff, 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(ang) = 2*M_PI / ((double) VAR(cpow2_divisor));
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VAR(c) = VAR(cpow2_r) * cos(M_PI/2*VAR(cpow2_a)) / ((double) VAR(cpow2_divisor));
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VAR(d) = VAR(cpow2_r) * sin(M_PI/2*VAR(cpow2_a)) / ((double) VAR(cpow2_divisor));
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VAR(half_c) = VAR(c) / 2;
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VAR(half_d) = VAR(d) / 2;
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VAR(inv_spread) = 0.5 / VAR(cpow2_spread);
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VAR(full_spread) = 2*M_PI*VAR(cpow2_spread);
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return TRUE; // Always 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 sn, cs;
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double a = atan2(FTy, FTx);
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int n = rand() % VAR(cpow2_spread);
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if (a < 0) n++;
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a += 2*M_PI*n;
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if (cos(a*VAR(inv_spread)) < rand()*2.0/RAND_MAX - 1.0)
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a -= VAR(full_spread);
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double lnr2 = log(FTx*FTx + FTy*FTy); // logarithm * 2
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double r = VVAR * exp(VAR(half_c) * lnr2 - VAR(d) * a);
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fsincos(VAR(c) * a + VAR(half_d) * lnr2 + VAR(ang) * rand(),
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&sn, &cs);
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FPx += r * cs;
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FPy += r * sn;
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return TRUE;
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}
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