95a2f54683
git-svn-id: https://svn.code.sf.net/p/apophysis7x/svn/trunk@1 a5d1c0f9-a0e9-45c6-87dd-9d276e40c949
80 lines
2.2 KiB
C
80 lines
2.2 KiB
C
/*
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Apophysis Plugin
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Copyright (C) 2007-2009 Joel Faber
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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 cpow_r;
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double cpow_i;
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int cpow_power;
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double c;
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double d;
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double ang;
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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("cpow");
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// Define the Variables
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APO_VARIABLES(
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VAR_REAL(cpow_r, 1.0),
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VAR_REAL(cpow_i, 0.0),
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VAR_INTEGER_NONZERO(cpow_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(ang) = 2.0 * M_PI / ((double) VAR(cpow_power));
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VAR(c) = VAR(cpow_r) / ((double) VAR(cpow_power));
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VAR(d) = VAR(cpow_i) / ((double) VAR(cpow_power));
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return TRUE; // Always return TRUE.
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}
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/*
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z' = z^(cpow_r + i * cpow_i)
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Simplified using formula:
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(a + i*b)^(c + i*d) = rho^c * e^(-d * theta) * [cos(c * theta + d * ln(rho) + i * sin(c * theta + d * ln(rho)],
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where (rho, theta) is the polar coordinate equivalent of z=(x, y).
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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); // Angular polar dimension
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double lnr = 0.5 * log(FTx*FTx + FTy*FTy); // Natural logarithm of the radial polar dimension.
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double m = VVAR * exp(VAR(c) * lnr - VAR(d) * a);
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fsincos(VAR(c) * a + VAR(d) * lnr + VAR(ang) * (rand() % VAR(cpow_power)), &sn, &cs);
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FPx += m * cs;
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FPy += m * sn;
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return TRUE;
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}
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