75 lines
1.9 KiB
C
75 lines
1.9 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 sigmoid_shiftx;
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double sigmoid_shifty;
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double sx, sy, ax, ay, vv;
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} Variables;
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#include "apoplugin.h"
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APO_PLUGIN("sigmoid");
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APO_VARIABLES(
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VAR_REAL(sigmoid_shiftx, 1.0),
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VAR_REAL(sigmoid_shifty, 1.0)
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);
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int PluginVarPrepare(Variation* vp)
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{
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VAR(ax) = 1.0; VAR(ay) = 1.0;
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VAR(sx) = VAR(sigmoid_shiftx); VAR(sy) = VAR(sigmoid_shifty);
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if (VAR(sx) < 1 && VAR(sx) > -1) {
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if (VAR(sx) == 0) {
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VAR(sx) = EPS; VAR(ax) = 1.0;
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} else {
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VAR(ax) = (VAR(sx) < 0 ? -1 : 1);
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VAR(sx) = 1 / VAR(sx);
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}
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}
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if (VAR(sy) < 1 && VAR(sy) > -1) {
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if (VAR(sy) == 0) {
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VAR(sy) = EPS; VAR(ay) = 1.0;
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} else {
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VAR(ay) = (VAR(sy) < 0 ? -1 : 1);
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VAR(sy) = 1 / VAR(sy);
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}
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}
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VAR(sx) *= -5;
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VAR(sy) *= -5;
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VAR(vv) = fabs(VVAR);
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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 c0 = VAR(ax) / (1.0 + exp(VAR(sx) * FTx));
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double c1 = VAR(ay) / (1.0 + exp(VAR(sy) * FTy));
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double x = (2 * (c0 - 0.5));
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double y = (2 * (c1 - 0.5));
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FPx += VAR(vv) * x;
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FPy += VAR(vv) * y;
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return TRUE;
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}
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