93 lines
2.2 KiB
C
93 lines
2.2 KiB
C
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/*
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Apophysis Plugin
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Copyright (c) 2008 Joel Faber. All rights reserverd.
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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 cell_size;
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double inv_cell_size;
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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("cell");
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// Define the Variables
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APO_VARIABLES(
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VAR_REAL(cell_size, 1.0)
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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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if (VAR(cell_size) == 0) VAR(cell_size) = 1e-6;
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VAR(inv_cell_size) = 1.0 / VAR(cell_size);
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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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// calculate input cell
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int x = floor(FTx*VAR(inv_cell_size));
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int y = floor(FTy*VAR(inv_cell_size));
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// Offset from cell origin
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double dx = FTx - x*VAR(cell_size);
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double dy = FTy - y*VAR(cell_size);
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// interleave cells
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if (y >= 0)
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{
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if (x >= 0)
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{
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y *= 2;
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x *= 2;
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}
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else
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{
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y *= 2;
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x = -(2*x+1);
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}
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}
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else
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{
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if (x >= 0)
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{
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y = -(2*y+1);
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x *= 2;
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}
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else
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{
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y = -(2*y+1);
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x = -(2*x+1);
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}
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}
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// calculate output point from interleaved cell
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FPx += VVAR * (dx + x*VAR(cell_size));
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FPy -= VVAR * (dy + y*VAR(cell_size));
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return TRUE;
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}
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