63 lines
1.7 KiB
C
63 lines
1.7 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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typedef struct
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{
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double swtin_distort;
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} Variables;
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#include "apoplugin.h"
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APO_PLUGIN("stwin");
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APO_VARIABLES(
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VAR_REAL(swtin_distort, 1.0)
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);
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int PluginVarPrepare(Variation* vp)
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{
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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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// at multiplier=1 the function begins to overlap at 0.05 so we
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// multiply with 0.05
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const double multiplier = 0.05;
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// then do the rest
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double x = FTx * VVAR * multiplier;
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double y = FTy * VVAR * multiplier;
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double x2 = x * x; double y2 = y * y;
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double x_plus_y = x + y;
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double x2_minus_y2 = x2 - y2;
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double x2_plus_y2 = x2 + y2;
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double result = x2_minus_y2 * sin(M_2PI * VAR(swtin_distort) * x_plus_y);
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double divident = 1.0;
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if (x2_plus_y2 != 0) divident = x2_plus_y2;
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result /= divident;
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FPx += VVAR * FTx + result;
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FPy += VVAR * FTy + result;
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return TRUE;
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}
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