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/****************************************************************************
*
* MODULE: d.histogram
* AUTHOR(S): Dave Johnson, DBA Systems, Inc. (original contributor)
* 10560 Arrowhead Drive Fairfax, Virginia 22030
* Markus Neteler <neteler itc.it>
* Bernhard Reiter <bernhard intevation.de>,
* Eric G. Miller <egm2 jps.net>,
* Glynn Clements <glynn gclements.plus.com>,
* Hamish Bowman <hamish_b yahoo.com>,
* Jan-Oliver Wagner <jan intevation.de>
* PURPOSE: draw a bar-chart or a pie-chart representing the
* histogram statistics of a cell-file
* COPYRIGHT: (C) 1999-2007 by the GRASS Development Team
*
* This program is free software under the GNU General Public
* License (>=v2). Read the file COPYING that comes with GRASS
* for details.
*
*****************************************************************************/
/******************************************************************************
* NOTE (shapiro):
* This program can NOT handle area information.
* Areas (as output by the r.stats command) are doubles.
* This program was written assuming areas are integers.
*
* The area option has been #ifdef'ed out of the code until someone
* upgrades both the get_stats() and the pie() and bar() routines
* as well as the struct stat_list (defined in dhist.h).
*****************************************************************************/
#include <stdlib.h>
#include <string.h>
#include <grass/gis.h>
#include <grass/raster.h>
#include <grass/display.h>
#include <grass/glocale.h>
#include "options.h"
#include "dhist.h"
struct stat_list dist_stats;
struct Categories cats;
struct FPRange fp_range;
int is_fp;
char *map_name;
int color;
float size;
int style;
int type;
int is_fp;
int nodata;
int nsteps;
int cat_ranges;
int main(int argc, char **argv)
{
int text_height;
int text_width;
struct Categories cats;
struct Range range;
struct Colors pcolors;
char title[GNAME_MAX];
double tt, tb, tl, tr;
double t, b, l, r;
struct GModule *module;
struct Option *opt1;
struct Option *opt2, *bg_opt;
struct Option *opt4;
struct Option *opt5;
struct Flag *flag1;
struct Flag *flag2;
/* Initialize the GIS calls */
G_gisinit(argv[0]);
module = G_define_module();
G_add_keyword(_("display"));
G_add_keyword(_("histogram"));
G_add_keyword(_("statistics"));
module->description =
_("Displays a histogram in the form of a pie or bar chart "
"for a user-specified raster map.");
opt1 = G_define_standard_option(G_OPT_R_MAP);
opt1->description = _("Raster map for which histogram will be displayed");
opt4 = G_define_option();
opt4->key = "style";
opt4->description = _("Indicate if a pie or bar chart is desired");
opt4->type = TYPE_STRING;
opt4->required = NO;
opt4->options = "pie,bar";
opt4->answer = "bar";
/* The color option specifies the color for the labels, tic-marks,
* and borders of the chart. */
opt2 = G_define_standard_option(G_OPT_C);
opt2->label = _("Color for text and axes");
bg_opt = G_define_standard_option(G_OPT_CN);
bg_opt->key = "bgcolor";
bg_opt->label = _("Background color");
bg_opt->answer = DEFAULT_BG_COLOR;
#ifdef CAN_DO_AREAS
opt3 = G_define_option();
opt3->key = "type";
opt3->description =
_("Indicate if cell counts or map areas should be displayed");
opt3->type = TYPE_STRING;
opt3->required = NO;
opt3->answer = "count";
opt3->options = "count,area";
#endif
opt5 = G_define_option();
opt5->key = "nsteps";
opt5->description =
_("Number of steps to divide the data range into (fp maps only)");
opt5->type = TYPE_INTEGER;
opt5->required = NO;
opt5->answer = "255";
flag1 = G_define_flag();
flag1->key = 'n';
flag1->description = _("Display information for null cells");
flag2 = G_define_flag();
flag2->key = 'c';
flag2->description =
_("Report for ranges defined in cats file (fp maps only)");
if (G_parser(argc, argv))
exit(EXIT_FAILURE);
map_name = opt1->answer;
color = D_parse_color(opt2->answer, FALSE);
type = COUNT;
#ifdef CAN_DO_AREAS
if (strcmp(opt3->answer, "count") == 0)
type = COUNT;
else
type = AREA;
#endif
if (strcmp(opt4->answer, "bar") == 0)
style = BAR;
else
style = PIE;
if (sscanf(opt5->answer, "%d", &nsteps) != 1)
G_fatal_error(_("Invalid number of steps: %s"), opt5->answer);
cat_ranges = flag2->answer;
if (cat_ranges && nsteps != 255)
G_warning(_("When -C flag is set, the nsteps argument is ignored"));
nodata = flag1->answer;
if (Rast_read_colors(map_name, "", &pcolors) == -1)
G_fatal_error(_("Color file for <%s> not available"), map_name);
if (Rast_read_cats(map_name, "", &cats) == -1)
G_fatal_error(_("Category file for <%s> not available"), map_name);
if (Rast_read_range(map_name, "", &range) == -1)
G_fatal_error(_("Range information for <%s> not available"), map_name);
/* get the distribution statistics */
get_stats(map_name, &dist_stats);
/* set up the graphics driver and initialize its color-table */
D_open_driver();
D_setup_unity(0); /* 0 = don't clear frame */
D_get_src(&t, &b, &l, &r);
/* clear the frame, if requested to do so */
if (strcmp(bg_opt->answer, "none") != 0)
D_erase(bg_opt->answer);
/* draw a title for */
sprintf(title, "%s", map_name);
text_height = (b - t) * 0.05;
text_width = (r - l) * 0.05 * 0.50;
D_text_size(text_width, text_height);
D_get_text_box(title, &tt, &tb, &tl, &tr);
D_pos_abs(l + (r - l) / 2 - (tr - tl) / 2, t + (b - t) * 0.07);
D_use_color(color);
D_text(title);
/* plot the distributrion statistics */
if (style == PIE)
pie(&dist_stats, &pcolors);
else
bar(&dist_stats, &pcolors);
D_save_command(G_recreate_command());
D_close_driver();
exit(EXIT_SUCCESS);
}
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