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

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