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 colormap_t *colormap;
  36 static guint sweep_tex = 0;
  37 static Radar *radar = NULL;
  38
  39 static AWeatherGui *gui = NULL;
  40
  41 /**************************
  42  * Data loading functions *
  43  **************************/
  44 /* Convert a sweep to an 2d array of data points */
  45 static void bscan_sweep(Sweep *sweep, guint8 **data, int *width, int *height)
  46 {
  47         /* Calculate max number of bins */
  48         int i, max_bins = 0;
  49         for (i = 0; i < sweep->h.nrays; i++)
  50                 max_bins = MAX(max_bins, sweep->ray[i]->h.nbins);
  51
  52         /* Allocate buffer using max number of bins for each ray */
  53         guint8 *buf = g_malloc0(sweep->h.nrays * max_bins * 4);
  54
  55         /* Fill the data */
  56         int ri, bi;
  57         for (ri = 0; ri < sweep->h.nrays; ri++) {
  58                 Ray *ray  = sweep->ray[ri];
  59                 for (bi = 0; bi < ray->h.nbins; bi++) {
  60                         /* copy RGBA into buffer */
  61                         //guint val   = dz_f(ray->range[bi]);
  62                         guint8 val   = (guint8)ray->h.f(ray->range[bi]);
  63                         guint  buf_i = (ri*max_bins+bi)*4;
  64                         buf[buf_i+0] = colormap->data[val][0];
  65                         buf[buf_i+1] = colormap->data[val][1];
  66                         buf[buf_i+2] = colormap->data[val][2];
  67                         buf[buf_i+3] = colormap->data[val][3];
  68                         if (val == BADVAL     || val == RFVAL      || val == APFLAG ||
  69                             val == NOTFOUND_H || val == NOTFOUND_V || val == NOECHO) {
  70                                 buf[buf_i+3] = 0x00; // transparent
  71                         }
  72                 }
  73         }
  74
  75         /* set output */
  76         *width  = max_bins;
  77         *height = sweep->h.nrays;
  78         *data   = buf;
  79 }
  80
  81 static void load_color_table(char *table)
  82 {
  83         for (int i = 0; colormaps[i].name; i++)
  84                 if (g_str_equal(colormaps[i].name, table))
  85                         colormap = &colormaps[i];
  86 }
  87
  88 /* Load a sweep as the active texture */
  89 static void load_sweep(Sweep *sweep)
  90 {
  91         aweather_gui_gl_begin(gui);
  92         cur_sweep = sweep;
  93         int height, width;
  94         guint8 *data;
  95         bscan_sweep(sweep, &data, &width, &height);
  96         glDeleteTextures(1, &sweep_tex);
  97         glGenTextures(1, &sweep_tex);
  98         glBindTexture(GL_TEXTURE_2D, sweep_tex);
  99         glPixelStorei(GL_PACK_ALIGNMENT, 1);
 100         glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
 101         glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 102         glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 103         glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, width, height, 0,
 104                         GL_RGBA, GL_UNSIGNED_BYTE, data);
 105         g_free(data);
 106         gtk_widget_queue_draw(aweather_gui_get_widget(gui, "drawing"));
 107         aweather_gui_gl_end(gui);
 108 }
 109
 110 /* Add selectors to the config area for the sweeps */
 111 static void load_radar_gui(Radar *radar)
 112 {
 113         /* Clear existing items */
 114         GtkWidget *child = gtk_bin_get_child(GTK_BIN(config_body));
 115         if (child)
 116                 gtk_widget_destroy(child);
 117
 118         GtkWidget *hbox = gtk_hbox_new(TRUE, 0);
 119         GtkWidget *button = NULL;
 120         int vi = 0, si = 0;
 121         for (vi = 0; vi < radar->h.nvolumes; vi++) {
 122                 Volume *vol = radar->v[vi];
 123                 if (vol == NULL) continue;
 124                 GtkWidget *vbox = gtk_vbox_new(FALSE, 0);
 125                 for (si = 0; si < vol->h.nsweeps; si++) {
 126                         Sweep *sweep = vol->sweep[si];
 127                         if (sweep == NULL) continue;
 128                         char *label = g_strdup_printf("Tilt: %.2f (%s)",
 129                                         sweep->h.elev, vol->h.type_str);
 130                         button = gtk_radio_button_new_with_label_from_widget(
 131                                         GTK_RADIO_BUTTON(button), label);
 132                         g_object_set(button, "draw-indicator", FALSE, NULL);
 133                         g_signal_connect_swapped(button, "clicked",
 134                                         G_CALLBACK(load_color_table), vol->h.type_str);
 135                         g_signal_connect_swapped(button, "clicked",
 136                                         G_CALLBACK(load_sweep), sweep);
 137                         gtk_box_pack_start(GTK_BOX(vbox), button, FALSE, TRUE, 0);
 138                         g_free(label);
 139                 }
 140                 gtk_box_pack_start(GTK_BOX(hbox), vbox, TRUE, TRUE, 0);
 141         }
 142         gtk_scrolled_window_add_with_viewport(GTK_SCROLLED_WINDOW(config_body), hbox);
 143         gtk_widget_show_all(hbox);
 144 }
 145
 146 /* Load a radar from a file */
 147 static void load_radar_rsl(GPid pid, gint status, gpointer _path)
 148 {
 149         gchar *path = _path;
 150         if (status != 0) {
 151                 g_warning("wsr88ddec exited with status %d", status);
 152                 return;
 153         }
 154         char *dir  = g_path_get_dirname(path);
 155         char *site = g_path_get_basename(dir);
 156         g_free(dir);
 157         RSL_read_these_sweeps("all", NULL);
 158         if (radar) {
 159                 g_message("Freeing radar");
 160                 RSL_free_radar(radar);
 161         }
 162         g_message("Allocating radar");
 163         radar = RSL_wsr88d_to_radar(path, site);
 164         if (radar == NULL) {
 165                 g_warning("fail to load radar: path=%s, site=%s", path, site);
 166                 g_free(path);
 167                 g_free(site);
 168                 return;
 169         }
 170         g_free(path);
 171         g_free(site);
 172
 173         /* Load the first sweep by default */
 174         if (radar->h.nvolumes < 1 || radar->v[0]->h.nsweeps < 1) {
 175                 g_warning("No sweeps found\n");
 176         } else {
 177                 /* load first available sweep */
 178                 for (int vi = 0; vi < radar->h.nvolumes; vi++) {
 179                         if (radar->v[vi]== NULL) continue;
 180                         for (int si = 0; si < radar->v[vi]->h.nsweeps; si++) {
 181                                 if (radar->v[vi]->sweep[si]== NULL) continue;
 182                                 load_color_table(radar->v[vi]->h.type_str);
 183                                 load_sweep(radar->v[vi]->sweep[si]);
 184                                 break;
 185                         }
 186                         break;
 187                 }
 188         }
 189
 190         load_radar_gui(radar);
 191 }
 192
 193 /* decompress a radar file, then chain to the actuall loading function */
 194 static void load_radar(char *path, gboolean updated, gpointer user_data)
 195 {
 196         char *raw  = g_strconcat(path, ".raw", NULL);
 197         if (!updated) {
 198                 load_radar_rsl(0, 0, raw);
 199         } else {
 200                 g_message("File updated, decompressing..");
 201                 char *argv[] = {"wsr88ddec", path, raw, NULL};
 202                 GPid pid;
 203                 GError *error = NULL;
 204                 g_spawn_async(
 205                         NULL,    // const gchar *working_directory,
 206                         argv,    // gchar **argv,
 207                         NULL,    // gchar **envp,
 208                         G_SPAWN_SEARCH_PATH|
 209                         G_SPAWN_DO_NOT_REAP_CHILD,
 210                                  // GSpawnFlags flags,
 211                         NULL,    // GSpawnChildSetupFunc child_setup,
 212                         NULL,    // gpointer user_data,
 213                         &pid,    // GPid *child_pid,
 214                         &error); // GError **error
 215                 if (error) {
 216                         g_warning("failed to decompress WSR88D data: %s",
 217                                         error->message);
 218                         g_error_free(error);
 219                 }
 220                 g_child_watch_add(pid, load_radar_rsl, raw);
 221         }
 222 }
 223
 224 static void update_times(char *site, char **last_time)
 225 {
 226         char *list_uri = g_strdup_printf(
 227                         "http://mesonet.agron.iastate.edu/data/nexrd2/raw/K%s/dir.list",
 228                         site);
 229         GFile *list    = g_file_new_for_uri(list_uri);
 230         g_free(list_uri);
 231
 232         gchar *data;
 233         gsize length;
 234         GError *error = NULL;
 235         g_file_load_contents(list, NULL, &data, &length, NULL, &error);
 236         g_object_unref(list);
 237         if (error) {
 238                 g_warning("Error loading list for %s: %s", site, error->message);
 239                 g_error_free(error);
 240                 return;
 241         }
 242         gchar **lines = g_strsplit(data, "\n", -1);
 243         GtkTreeView  *tview  = GTK_TREE_VIEW(aweather_gui_get_widget(gui, "time"));
 244         GtkListStore *lstore = GTK_LIST_STORE(gtk_tree_view_get_model(tview));
 245         gtk_list_store_clear(lstore);
 246         GtkTreeIter iter;
 247         for (int i = 0; lines[i] && lines[i][0]; i++) {
 248                 // format: `841907 KABR_20090510_0159'
 249                 //g_message("\tadding %p [%s]", lines[i], lines[i]);
 250                 char **parts = g_strsplit(lines[i], " ", 2);
 251                 char *time = parts[1]+5;
 252                 gtk_list_store_insert(lstore, &iter, 0);
 253                 gtk_list_store_set(lstore, &iter, 0, time, -1);
 254                 g_strfreev(parts);
 255         }
 256
 257         if (last_time)
 258                 gtk_tree_model_get(GTK_TREE_MODEL(lstore), &iter, 0, last_time, -1);
 259
 260         g_free(data);
 261         g_strfreev(lines);
 262 }
 263
 264 /*************
 265  * Callbacks *
 266  *************/
 267 static gboolean on_expose(GtkWidget *da, GdkEventExpose *event, gpointer user_data)
 268 {
 269         g_message("radar:expose");
 270         if (cur_sweep == NULL)
 271                 return FALSE;
 272         Sweep *sweep = cur_sweep;
 273
 274         /* Draw the rays */
 275
 276         glMatrixMode(GL_MODELVIEW);
 277         glPushMatrix();
 278         glBindTexture(GL_TEXTURE_2D, sweep_tex);
 279         glEnable(GL_TEXTURE_2D);
 280         glDisable(GL_ALPHA_TEST);
 281         glColor4f(1,1,1,1);
 282         glBegin(GL_QUAD_STRIP);
 283         for (int ri = 0; ri <= sweep->h.nrays; ri++) {
 284                 Ray  *ray = NULL;
 285                 double angle = 0;
 286                 if (ri < sweep->h.nrays) {
 287                         ray = sweep->ray[ri];
 288                         angle = ((ray->h.azimuth - ((double)ray->h.beam_width/2.))*M_PI)/180.0;
 289                 } else {
 290                         /* Do the right side of the last sweep */
 291                         ray = sweep->ray[ri-1];
 292                         angle = ((ray->h.azimuth + ((double)ray->h.beam_width/2.))*M_PI)/180.0;
 293                 }
 294
 295                 double lx = sin(angle);
 296                 double ly = cos(angle);
 297
 298                 double near_dist = ray->h.range_bin1;
 299                 double far_dist  = ray->h.nbins*ray->h.gate_size + ray->h.range_bin1;
 300
 301                 /* (find middle of bin) / scale for opengl */
 302                 // near left
 303                 glTexCoord2f(0.0, (double)ri/sweep->h.nrays);
 304                 glVertex3f(lx*near_dist, ly*near_dist, 2.0);
 305
 306                 // far  left
 307                 glTexCoord2f(1.0, (double)ri/sweep->h.nrays);
 308                 glVertex3f(lx*far_dist,  ly*far_dist,  2.0);
 309         }
 310         //g_print("ri=%d, nr=%d, bw=%f\n", _ri, sweep->h.nrays, sweep->h.beam_width);
 311         glEnd();
 312         glPopMatrix();
 313
 314         /* Texture debug */
 315         //glBegin(GL_QUADS);
 316         //glTexCoord2d( 0.,  0.); glVertex3f(-1.,  0., 0.); // bot left
 317         //glTexCoord2d( 0.,  1.); glVertex3f(-1.,  1., 0.); // top left
 318         //glTexCoord2d( 1.,  1.); glVertex3f( 0.,  1., 0.); // top right
 319         //glTexCoord2d( 1.,  0.); glVertex3f( 0.,  0., 0.); // bot right
 320         //glEnd();
 321
 322         /* Print the color table */
 323         glDisable(GL_TEXTURE_2D);
 324         glDisable(GL_DEPTH_TEST);
 325         glMatrixMode(GL_MODELVIEW ); glPushMatrix(); glLoadIdentity();
 326         glMatrixMode(GL_PROJECTION); glPushMatrix(); glLoadIdentity();
 327         glBegin(GL_QUADS);
 328         int i;
 329         for (i = 0; i < 256; i++) {
 330                 glColor4ub(colormap->data[i][0],
 331                            colormap->data[i][1],
 332                            colormap->data[i][2],
 333                            colormap->data[i][3]);
 334                 glVertex3f(-1.0, (float)((i  ) - 256/2)/(256/2), 0.0); // bot left
 335                 glVertex3f(-1.0, (float)((i+1) - 256/2)/(256/2), 0.0); // top left
 336                 glVertex3f(-0.9, (float)((i+1) - 256/2)/(256/2), 0.0); // top right
 337                 glVertex3f(-0.9, (float)((i  ) - 256/2)/(256/2), 0.0); // bot right
 338         }
 339         glEnd();
 340         glEnable(GL_DEPTH_TEST);
 341         glEnable(GL_ALPHA_TEST);
 342         glMatrixMode(GL_PROJECTION); glPopMatrix();
 343         glMatrixMode(GL_MODELVIEW ); glPopMatrix();
 344         return FALSE;
 345 }
 346
 347 static void on_time_changed(AWeatherView *view, char *time, gpointer user_data)
 348 {
 349         g_message("radar:setting time");
 350         // format: http://mesonet.agron.iastate.edu/data/nexrd2/raw/KABR/KABR_20090510_0323
 351         char *site = aweather_view_get_location(view);
 352         char *base = "http://mesonet.agron.iastate.edu/data/";
 353         char *path = g_strdup_printf("nexrd2/raw/K%s/K%s_%s", site, site, time);
 354
 355         radar = NULL;
 356         cur_sweep = NULL; // Clear radar
 357         gtk_widget_queue_draw(aweather_gui_get_widget(gui, "drawing"));
 358
 359         cache_file(base, path, AWEATHER_AUTOMATIC, load_radar, NULL);
 360         g_free(path);
 361 }
 362
 363 static void on_location_changed(AWeatherView *view, char *site, gpointer user_data)
 364 {
 365         g_message("Loading wsr88d list for %s", site);
 366         char *time = NULL;
 367         update_times(site, &time);
 368         aweather_view_set_time(view, time);
 369
 370         g_free(time);
 371 }
 372
 373 static void on_refresh(AWeatherView *view, gpointer user_data)
 374 {
 375         char *site = aweather_view_get_location(view);
 376         char *time = NULL;
 377         update_times(site, &time);
 378         aweather_view_set_time(view, time);
 379         g_free(time);
 380 }
 381
 382 /* Init */
 383 gboolean radar_init(AWeatherGui *_gui)
 384 {
 385         gui = _gui;
 386         drawing = aweather_gui_get_widget(gui, "drawing");
 387         GtkWidget    *config  = aweather_gui_get_widget(gui, "tabs");
 388         AWeatherView *view    = aweather_gui_get_view(gui);
 389
 390         /* Add configuration tab */
 391         config_body = gtk_scrolled_window_new(NULL, NULL);
 392         gtk_scrolled_window_add_with_viewport(GTK_SCROLLED_WINDOW(config_body),
 393                         gtk_label_new("No radar loaded"));
 394         gtk_scrolled_window_set_policy(GTK_SCROLLED_WINDOW(config_body),
 395                         GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC);
 396         gtk_notebook_prepend_page(GTK_NOTEBOOK(config),
 397                         config_body, gtk_label_new("Radar"));
 398
 399         /* Set up OpenGL Stuff */
 400         g_signal_connect(drawing, "expose-event",     G_CALLBACK(on_expose),           NULL);
 401         g_signal_connect(view,    "location-changed", G_CALLBACK(on_location_changed), NULL);
 402         g_signal_connect(view,    "time-changed",     G_CALLBACK(on_time_changed),     NULL);
 403         g_signal_connect(view,    "refresh",          G_CALLBACK(on_refresh),          NULL);
 404
 405         return TRUE;
 406 }