1 /* PSPP - computes sample statistics.
2 Copyright (C) 2004 Free Software Foundation, Inc.
4 This program is free software; you can redistribute it and/or
5 modify it under the terms of the GNU General Public License as
6 published by the Free Software Foundation; either version 2 of the
7 License, or (at your option) any later version.
9 This program is distributed in the hope that it will be useful, but
10 WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
23 #include "chart-geometry.h"
25 /* Adjust tick to be a sensible value
26 ie: ... 0.1,0.2,0.5, 1,2,5, 10,20,50 ... */
28 chart_rounded_tick(double tick)
33 double diff = DBL_MAX;
36 static const double standard_ticks[] = {1, 2, 5, 10};
38 const double factor = pow(10,ceil(log10(standard_ticks[0] / tick))) ;
40 for (i = 3 ; i >= 0 ; --i)
42 const double d = fabs( tick - standard_ticks[i] / factor ) ;
47 t = standard_ticks[i] / factor ;