histogram tick drawing - added format generation for optimum tick drawing

[pspp] / tests / math / chart-get-ticks-format-test.c

diff --git a/tests/math/chart-get-ticks-format-test.c b/tests/math/chart-get-ticks-format-test.c
new file mode 100644 (file)
index 0000000..a1b155e
--- /dev/null
+++ b/tests/math/chart-get-ticks-format-test.c
@@ -0,0 +1,75 @@
+/* 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 <stdio.h>
+#include "math/chart-geometry.h"
+#include "libpspp/compiler.h"
+
+struct range {
+  double max;
+  double min;
+  int nticks;
+};
+
+struct range tv[] = {
+  {       1000.0,            10.0,     10},
+  {      10000.0,            10.0,     10},
+  {     100000.0,            10.0,     10},
+  {    1000000.0,            10.0,     10},
+  {   10000000.0,            10.0,     10},
+  {  100000000.0,            10.0,     10},
+  {          0.1,            0.01,     10},
+  {      0.00001,        0.000001,     10},
+  { 0.0000100001,         0.00001,     10},
+  {  100000010.0,     100000000.0,     10},
+  {     100000.0,       -500000.0,     10},
+  {          5.0,            -5.0,     10},
+  {          5.0,          -4.999,     10},
+  {          5.0,          -4.999,      9},
+  {          5.0,             0.0,     10},
+  {          0.0,            -5.0,      9},
+  {    1.001E-95,         1.0E-95,     10},
+  {     1.001E98,          1.0E98,     10},
+  {     1.001E33,         1.0E-22,     10},
+  {          0.0,             0.0,     -1}
+};
+
+int
+main (int argc UNUSED, char **argv UNUSED)
+{
+  char *fs;
+  double scale;
+  int i = 0;
+  double max, min;
+  int nticks;
+
+  for(i=0;tv[i].nticks > 0;i++)
+    {
+      max = tv[i].max;
+      min = tv[i].min;
+      nticks = tv[i].nticks;
+      fs = chart_get_ticks_format (max, min, nticks, &scale);
+      printf("max: %lg, min: %lg, nticks: %d, fs: %s, scale: %lg, example: ",
+            max, min, nticks, fs, scale);
+      printf(fs,((max-min)/2.0+min)*scale);
+      printf("\n");
+      free(fs);
+    }
+
+  return 0;
+}