Pileus Git - grits/blob - src/plugin-radar.c

   1 /*
   2  * Copyright (C) 2009 Andy Spencer <spenceal@rose-hulman.edu>
   3  *
   4  * This program is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 3 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include <config.h>
  19 #include <gtk/gtk.h>
  20 #include <gtk/gtkgl.h>
  21 #include <GL/gl.h>
  22 #include <math.h>
  23
  24 #include "rsl.h"
  25
  26 #include "aweather-gui.h"
  27 #include "plugin-radar.h"
  28 #include "data.h"
  29
  30 GtkWidget *drawing;
  31 GtkWidget *config_body;
  32 static Sweep *cur_sweep = NULL;  // make this not global
  33 static int nred, ngreen, nblue;
  34 static char red[256], green[256], blue[256];
  35 static guint sweep_tex = 0;
  36
  37 static AWeatherGui *gui = NULL;
  38 static Radar *radar = NULL;
  39
  40 /**************************
  41  * Data loading functions *
  42  **************************/
  43 /* return a GL alpha value for a radar pixle */
  44 static guint8 get_alpha(guint8 db)
  45 {
  46         if (db == BADVAL) return 0;
  47         if (db == RFVAL ) return 0;
  48         if (db == APFLAG) return 0;
  49         if (db == NOECHO) return 0;
  50         if (db == 0     ) return 0;
  51         if      (db > 60) return 0;
  52         else if (db < 10) return 0;
  53         else if (db < 25) return (db-10)*(255.0/15);
  54         else              return 255;
  55 }
  56
  57 /* Convert a sweep to an 2d array of data points */
  58 static void bscan_sweep(Sweep *sweep, guint8 **data, int *width, int *height)
  59 {
  60         /* Calculate max number of bins */
  61         int i, max_bins = 0;
  62         for (i = 0; i < sweep->h.nrays; i++)
  63                 max_bins = MAX(max_bins, sweep->ray[i]->h.nbins);
  64
  65         /* Allocate buffer using max number of bins for each ray */
  66         guint8 *buf = g_malloc0(sweep->h.nrays * max_bins * 4);
  67
  68         /* Fill the data */
  69         int ri, bi;
  70         for (ri = 0; ri < sweep->h.nrays; ri++) {
  71                 Ray *ray  = sweep->ray[ri];
  72                 for (bi = 0; bi < ray->h.nbins; bi++) {
  73                         /* copy RGBA into buffer */
  74                         //guint val   = dz_f(ray->range[bi]);
  75                         guint val   = ray->h.f(ray->range[bi]);
  76                         guint buf_i = (ri*max_bins+bi)*4;
  77                         buf[buf_i+0] =   red[val];
  78                         buf[buf_i+1] = green[val];
  79                         buf[buf_i+2] =  blue[val];
  80                         buf[buf_i+3] = get_alpha(val);
  81                 }
  82         }
  83
  84         /* set output */
  85         *width  = max_bins;
  86         *height = sweep->h.nrays;
  87         *data   = buf;
  88 }
  89
  90 /* Load a sweep as the active texture */
  91 static void load_sweep(Sweep *sweep)
  92 {
  93         aweather_gui_gl_begin(gui);
  94         cur_sweep = sweep;
  95         int height, width;
  96         guint8 *data;
  97         bscan_sweep(sweep, &data, &width, &height);
  98         glGenTextures(1, &sweep_tex);
  99         glBindTexture(GL_TEXTURE_2D, sweep_tex);
 100         glPixelStorei(GL_PACK_ALIGNMENT, 1);
 101         glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
 102         glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 103         glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 104         glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, data);
 105         g_free(data);
 106         gdk_window_invalidate_rect(drawing->window, &drawing->allocation, FALSE);
 107         gdk_window_process_updates(drawing->window, FALSE);
 108         aweather_gui_gl_end(gui);
 109 }
 110
 111 /* Add selectors to the config area for the sweeps */
 112 static void load_radar_gui(Radar *radar)
 113 {
 114         /* Clear existing items */
 115         GtkWidget *child = gtk_bin_get_child(GTK_BIN(config_body));
 116         if (child)
 117                 gtk_widget_destroy(child);
 118
 119         GtkWidget *hbox = gtk_hbox_new(TRUE, 0);
 120         GtkWidget *button = NULL;
 121         int vi = 0, si = 0;
 122         for (vi = 0; vi < radar->h.nvolumes; vi++) {
 123                 Volume *vol = radar->v[vi];
 124                 if (vol == NULL) continue;
 125                 GtkWidget *vbox = gtk_vbox_new(TRUE, 0);
 126                 for (si = vol->h.nsweeps-1; si >= 0; si--) {
 127                         Sweep *sweep = vol->sweep[si];
 128                         if (sweep == NULL) continue;
 129                         char *label = g_strdup_printf("Tilt: %.2f (%s)", sweep->h.elev, vol->h.type_str);
 130                         button = gtk_radio_button_new_with_label_from_widget(GTK_RADIO_BUTTON(button), label);
 131                         g_object_set(button, "draw-indicator", FALSE, NULL);
 132                         g_signal_connect_swapped(button, "clicked", G_CALLBACK(load_sweep), sweep);
 133                         gtk_box_pack_start(GTK_BOX(vbox), button, FALSE, TRUE, 0);
 134                         g_free(label);
 135                 }
 136                 gtk_box_set_homogeneous(GTK_BOX(vbox), FALSE);
 137                 gtk_box_pack_start(GTK_BOX(hbox), vbox, TRUE, TRUE, 0);
 138         }
 139         gtk_scrolled_window_add_with_viewport(GTK_SCROLLED_WINDOW(config_body), hbox);
 140         gtk_widget_show_all(hbox);
 141 }
 142
 143 /* Load a radar from a file */
 144 static void load_radar_rsl(GPid pid, gint status, gpointer _path)
 145 {
 146         gchar *path = _path;
 147         if (status != 0) {
 148                 g_warning("wsr88ddec exited with status %d", status);
 149                 return;
 150         }
 151         char *site = g_path_get_basename(g_path_get_dirname(path));
 152         if (radar) RSL_free_radar(radar);
 153         RSL_read_these_sweeps("all", NULL);
 154         radar = RSL_wsr88d_to_radar(path, site);
 155         if (radar == NULL) {
 156                 g_warning("fail to load radar: path=%s, site=%s", path, site);
 157                 return;
 158         }
 159
 160         /* TODO: replace this with a better color table */
 161         g_message("loading color table");
 162         RSL_load_refl_color_table();
 163         RSL_get_color_table(RSL_RED_TABLE,   red,   &nred);
 164         RSL_get_color_table(RSL_GREEN_TABLE, green, &ngreen);
 165         RSL_get_color_table(RSL_BLUE_TABLE,  blue,  &nblue);
 166
 167         /* Load the first sweep by default */
 168         if (radar->h.nvolumes < 1 || radar->v[0]->h.nsweeps < 1) {
 169                 g_warning("No sweeps found\n");
 170         } else {
 171                 /* load first available sweep */
 172                 for (int vi = 0; vi < radar->h.nvolumes; vi++) {
 173                         if (radar->v[vi]== NULL) continue;
 174                         for (int si = 0; si < radar->v[vi]->h.nsweeps; si++) {
 175                                 if (radar->v[vi]->sweep[si]== NULL) continue;
 176                                 load_sweep(radar->v[vi]->sweep[si]);
 177                                 break;
 178                         }
 179                         break;
 180                 }
 181         }
 182
 183         load_radar_gui(radar);
 184 }
 185
 186 /* decompress a radar file, then chain to the actuall loading function */
 187 static void load_radar(char *path, gpointer user_data)
 188 {
 189         char *raw  = g_strconcat(path, ".raw", NULL);
 190         if (g_file_test(raw, G_FILE_TEST_EXISTS)) {
 191                 load_radar_rsl(0, 0, raw);
 192         } else {
 193                 char *argv[] = {"wsr88ddec", path, raw, NULL};
 194                 GPid pid;
 195                 GError *error = NULL;
 196                 g_spawn_async(
 197                         NULL,    // const gchar *working_directory,
 198                         argv,    // gchar **argv,
 199                         NULL,    // gchar **envp,
 200                         G_SPAWN_SEARCH_PATH|
 201                         G_SPAWN_DO_NOT_REAP_CHILD,
 202                                  // GSpawnFlags flags,
 203                         NULL,    // GSpawnChildSetupFunc child_setup,
 204                         NULL,    // gpointer user_data,
 205                         &pid,    // GPid *child_pid,
 206                         &error); // GError **error
 207                 if (error)
 208                         g_warning("failed to decompress WSR88D data: %s", error->message);
 209                 g_child_watch_add(pid, load_radar_rsl, raw);
 210         }
 211 }
 212
 213 /*************
 214  * Callbacks *
 215  *************/
 216 static gboolean expose(GtkWidget *da, GdkEventExpose *event, gpointer user_data)
 217 {
 218         g_message("radar:expose");
 219         if (cur_sweep == NULL)
 220                 return FALSE;
 221         Sweep *sweep = cur_sweep;
 222
 223         /* Draw the rays */
 224
 225         glMatrixMode(GL_MODELVIEW);
 226         glPushMatrix();
 227         glBindTexture(GL_TEXTURE_2D, sweep_tex);
 228         glEnable(GL_TEXTURE_2D);
 229         glDisable(GL_ALPHA_TEST);
 230         glColor4f(1,1,1,1);
 231         glBegin(GL_QUAD_STRIP);
 232         for (int ri = 0; ri <= sweep->h.nrays+1; ri++) {
 233                 /* Do the first sweep twice to complete the last Quad */
 234                 Ray *ray = sweep->ray[ri % sweep->h.nrays];
 235
 236                 /* right and left looking out from radar */
 237                 double left  = ((ray->h.azimuth - ((double)ray->h.beam_width/2.))*M_PI)/180.0;
 238                 //double right = ((ray->h.azimuth + ((double)ray->h.beam_width/2.))*M_PI)/180.0;
 239
 240                 double lx = sin(left);
 241                 double ly = cos(left);
 242
 243                 double near_dist = ray->h.range_bin1;
 244                 double far_dist  = ray->h.nbins*ray->h.gate_size + ray->h.range_bin1;
 245
 246                 /* (find middle of bin) / scale for opengl */
 247                 // near left
 248                 glTexCoord2f(0.0, (double)ri/sweep->h.nrays);
 249                 glVertex3f(lx*near_dist, ly*near_dist, 2.0);
 250
 251                 // far  left
 252                 glTexCoord2f(1.0, (double)ri/sweep->h.nrays);
 253                 glVertex3f(lx*far_dist,  ly*far_dist,  2.0);
 254         }
 255         //g_print("ri=%d, nr=%d, bw=%f\n", _ri, sweep->h.nrays, sweep->h.beam_width);
 256         glEnd();
 257         glPopMatrix();
 258
 259         /* Texture debug */
 260         //glBegin(GL_QUADS);
 261         //glTexCoord2d( 0.,  0.); glVertex3f(-1.,  0., 0.); // bot left
 262         //glTexCoord2d( 0.,  1.); glVertex3f(-1.,  1., 0.); // top left
 263         //glTexCoord2d( 1.,  1.); glVertex3f( 0.,  1., 0.); // top right
 264         //glTexCoord2d( 1.,  0.); glVertex3f( 0.,  0., 0.); // bot right
 265         //glEnd();
 266
 267         /* Print the color table */
 268         glDisable(GL_TEXTURE_2D);
 269         glDisable(GL_DEPTH_TEST);
 270         glMatrixMode(GL_MODELVIEW ); glPushMatrix(); glLoadIdentity();
 271         glMatrixMode(GL_PROJECTION); glPushMatrix(); glLoadIdentity();
 272         glBegin(GL_QUADS);
 273         int i;
 274         for (i = 0; i < nred; i++) {
 275                 glColor4ub(red[i], green[i], blue[i], get_alpha(i));
 276                 glVertex3f(-1.0, (float)((i  ) - nred/2)/(nred/2), 0.0); // bot left
 277                 glVertex3f(-1.0, (float)((i+1) - nred/2)/(nred/2), 0.0); // top left
 278                 glVertex3f(-0.9, (float)((i+1) - nred/2)/(nred/2), 0.0); // top right
 279                 glVertex3f(-0.9, (float)((i  ) - nred/2)/(nred/2), 0.0); // bot right
 280         }
 281         glEnd();
 282         glEnable(GL_DEPTH_TEST);
 283         glEnable(GL_ALPHA_TEST);
 284         glMatrixMode(GL_PROJECTION); glPopMatrix();
 285         glMatrixMode(GL_MODELVIEW ); glPopMatrix();
 286         return FALSE;
 287 }
 288
 289 static void set_time(AWeatherView *view, char *time, gpointer user_data)
 290 {
 291         g_message("radar:setting time");
 292         // format: http://mesonet.agron.iastate.edu/data/nexrd2/raw/KABR/KABR_20090510_0323
 293         char *site = aweather_view_get_location(view);
 294         char *base = "http://mesonet.agron.iastate.edu/data/";
 295         char *path = g_strdup_printf("nexrd2/raw/K%s/K%s_%s", site, site, time);
 296         //g_message("caching %s/%s", base, path);
 297         cache_file(base, path, load_radar, NULL);
 298 }
 299
 300 static void set_site(AWeatherView *view, char *site, gpointer user_data)
 301 {
 302         g_message("Loading wsr88d list for %s", site);
 303         gchar *data;
 304         gsize length;
 305         GError *error = NULL;
 306         char *list_uri = g_strdup_printf("http://mesonet.agron.iastate.edu/data/nexrd2/raw/K%s/dir.list", site);
 307         GFile *list    = g_file_new_for_uri(list_uri);
 308         g_file_load_contents(list, NULL, &data, &length, NULL, &error);
 309         if (error) {
 310                 g_warning("Error loading list for %s: %s", site, error->message);
 311                 return;
 312         }
 313         gchar **lines = g_strsplit(data, "\n", -1);
 314         GtkTreeView  *tview  = GTK_TREE_VIEW(aweather_gui_get_widget(gui, "time"));
 315         GtkListStore *lstore = GTK_LIST_STORE(gtk_tree_view_get_model(tview));
 316         gtk_list_store_clear(lstore);
 317         radar = NULL;
 318         char *time = NULL;
 319         for (int i = 0; lines[i] && lines[i][0]; i++) {
 320                 // format: `841907 KABR_20090510_0159'
 321                 //g_message("\tadding %p [%s]", lines[i], lines[i]);
 322                 char **parts = g_strsplit(lines[i], " ", 2);
 323                 time = parts[1]+5;
 324                 GtkTreeIter iter;
 325                 gtk_list_store_insert(lstore, &iter, 0);
 326                 gtk_list_store_set(lstore, &iter, 0, time, -1);
 327         }
 328         if (time != NULL)
 329                 aweather_view_set_time(view, time);
 330 }
 331
 332 /* Init */
 333 gboolean radar_init(AWeatherGui *_gui)
 334 {
 335         gui = _gui;
 336         drawing = aweather_gui_get_widget(gui, "drawing");
 337         GtkNotebook    *config  = GTK_NOTEBOOK(aweather_gui_get_widget(gui, "tabs"));
 338         AWeatherView   *view    = aweather_gui_get_view(gui);
 339
 340         /* Add configuration tab */
 341         config_body = gtk_scrolled_window_new(NULL, NULL);
 342         gtk_scrolled_window_add_with_viewport(GTK_SCROLLED_WINDOW(config_body), gtk_label_new("No radar loaded"));
 343         gtk_scrolled_window_set_policy(GTK_SCROLLED_WINDOW(config_body), GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC);
 344         gtk_notebook_append_page(GTK_NOTEBOOK(config), config_body, gtk_label_new("Radar"));
 345
 346         /* Set up OpenGL Stuff */
 347         g_signal_connect(drawing, "expose-event",     G_CALLBACK(expose),   NULL);
 348         g_signal_connect(view,    "location-changed", G_CALLBACK(set_site), NULL);
 349         g_signal_connect(view,    "time-changed",     G_CALLBACK(set_time), NULL);
 350
 351         return TRUE;
 352 }