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/* PSPP - a program for statistical analysis.
Copyright (C) 2015 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include <config.h>
#include <stdlib.h>
#include <stdbool.h>
#include <assert.h>
#include <string.h>
#include "libpspp/compiler.h"
#include "math/chart-geometry.h"
#include <limits.h>
#include <float.h>
#include <math.h>
#if 0
static void
dump_scale (const double low, const double interval, int n_ticks)
{
int i;
double tick = low;
for (i = 0; i <= n_ticks; ++i)
{
printf ("Tick %d: %g\n", i, tick);
tick += interval;
}
}
#endif
static void
test_range (double low, double high)
{
int n_ticks = 0;
double interval;
double lower;
chart_get_scale (high, low,
&lower, &interval, &n_ticks);
if ((high - low) < 10 * DBL_MIN){
assert (n_ticks == 0);
assert (lower == low);
assert (interval <= 10 * DBL_MIN);
}
else
assert (n_ticks > 4);
assert (n_ticks <= 10);
#if 0
printf("%s: high: %lg, low %lg, interval: %lg, nticks: %d\n",
__FUNCTION__, high, low, interval, n_ticks);
dump_scale (lower, interval, n_ticks);
#endif
if ((high - low) > 10 * DBL_MIN) {
assert (lower <= low);
assert (lower + interval > low);
assert (lower + n_ticks * interval < high);
assert (lower + (n_ticks + 1) * interval >= high);
}
}
int
main (int argc UNUSED, char **argv UNUSED)
{
test_range (0, 0);
test_range (5, 5);
test_range (-5, -5);
test_range (0, 7);
test_range (0.2, 11);
test_range (-0.2, 11);
test_range (-10, 0.2);
test_range (-10, -0.2);
test_range (-10000, 10003);
test_range (50042,50053);
test_range (-50010, -49999);
test_range (0.000100002, 0.000100010);
test_range (102, 50030);
test_range (0.00102, 0.0050030);
return 0;
}
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