Pileus Git - aweather/blob - src/radar.c

   1 #include <config.h>
   2 #include <gtk/gtk.h>
   3 #include <gtk/gtkgl.h>
   4 #include <gdk/gdkkeysyms.h>
   5 #include <GL/gl.h>
   6 #include <math.h>
   7
   8 #include "rsl.h"
   9
  10 #include "radar.h"
  11
  12 GtkWidget *drawing;
  13 static Sweep *cur_sweep = NULL;  // make this not global
  14 static int nred, ngreen, nblue;
  15 static char red[256], green[256], blue[256];
  16 static guint sweep_tex = 0;
  17
  18 static guint8 get_alpha(guint8 db)
  19 {
  20         if (db == BADVAL) return 0;
  21         if (db == RFVAL ) return 0;
  22         if (db == APFLAG) return 0;
  23         if (db == NOECHO) return 0;
  24         if (db == 0     ) return 0;
  25         //if      (db > 60) return 0;
  26         //else if (db < 10) return 0;
  27         //else if (db < 25) return (db-10)*(255.0/15);
  28         else              return 255;
  29 }
  30
  31 //#ifdef USE_TWO_BYTE_PRECISION
  32 //#define F_FACTOR 100.0
  33 //#define F_DR_FACTOR 1000.0
  34 //#define F_DZ_RANGE_OFFSET 50
  35 //#else
  36 //#define F_FACTOR 2.0
  37 //#define F_DR_FACTOR 10.0
  38 //#define F_DZ_RANGE_OFFSET 32
  39 //#endif
  40 //#define F_OFFSET 4
  41 //static float dz_f(Range x)
  42 //{
  43 //      if (x >= F_OFFSET)
  44 //              return (((float)x-F_OFFSET)/F_FACTOR - F_DZ_RANGE_OFFSET);
  45 //      if (x == 0) return BADVAL;
  46 //      if (x == 1) return RFVAL;
  47 //      if (x == 2) return APFLAG;
  48 //      if (x == 3) return NOECHO;
  49 //      return BADVAL;
  50 //}
  51
  52 /* Convert a sweep to an 2d array of data points */
  53 static void bscan_sweep(Sweep *sweep, guint8 **data, int *width, int *height)
  54 {
  55         /* Calculate max number of bins */
  56         int i, max_bins = 0;
  57         for (i = 0; i < sweep->h.nrays; i++)
  58                 max_bins = MAX(max_bins, sweep->ray[i]->h.nbins);
  59
  60         /* Allocate buffer using max number of bins for each ray */
  61         guint8 *buf = g_malloc0(sweep->h.nrays * max_bins * 4);
  62
  63         /* Fill the data */
  64         int ri, bi;
  65         for (ri = 0; ri < sweep->h.nrays; ri++) {
  66                 Ray *ray  = sweep->ray[ri];
  67                 for (bi = 0; bi < ray->h.nbins; bi++) {
  68                         /* copy RGBA into buffer */
  69                         //guint val   = dz_f(ray->range[bi]);
  70                         guint val   = ray->h.f(ray->range[bi]);
  71                         guint buf_i = (ri*max_bins+bi)*4;
  72                         buf[buf_i+0] =   red[val];
  73                         buf[buf_i+1] = green[val];
  74                         buf[buf_i+2] =  blue[val];
  75                         buf[buf_i+3] = get_alpha(val);
  76                 }
  77         }
  78
  79         /* set output */
  80         *width  = max_bins;
  81         *height = sweep->h.nrays;
  82         *data   = buf;
  83 }
  84
  85 /* Load a sweep as the active texture */
  86 static void load_sweep(Sweep *sweep)
  87 {
  88         cur_sweep = sweep;
  89         int height, width;
  90         guint8 *data;
  91         bscan_sweep(sweep, &data, &width, &height);
  92         glGenTextures(1, &sweep_tex);
  93         glBindTexture(GL_TEXTURE_2D, sweep_tex);
  94         glPixelStorei(GL_PACK_ALIGNMENT, 1);
  95         glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
  96         glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
  97         glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
  98         glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, data);
  99         g_free(data);
 100         gdk_window_invalidate_rect(drawing->window, &drawing->allocation, FALSE);
 101 }
 102
 103 /* Load the default sweep */
 104 static gboolean configure(GtkWidget *da, GdkEventConfigure *event, gpointer user_data)
 105 {
 106         Sweep *first = (Sweep*)user_data;
 107         if (cur_sweep == NULL)
 108                 load_sweep(first);
 109         return FALSE;
 110 }
 111
 112 static gboolean expose(GtkWidget *da, GdkEventExpose *event, gpointer user_data)
 113 {
 114         //g_message("radar:expose");
 115         Sweep *sweep = cur_sweep;
 116
 117         /* Draw the rays */
 118         glBindTexture(GL_TEXTURE_2D, sweep_tex);
 119         glEnable(GL_TEXTURE_2D);
 120
 121         glBegin(GL_QUAD_STRIP);
 122         int _ri; // not really used, creates strange fragments..
 123         for (_ri = 0; _ri < sweep->h.nrays; _ri++) {
 124                 /* Do the first sweep twice to complete the last Quad */
 125                 int ri = _ri % sweep->h.nrays;
 126                 Ray *ray = sweep->ray[ri];
 127
 128                 /* right and left looking out from radar */
 129                 double left  = ((ray->h.azimuth - ((double)ray->h.beam_width/2.))*M_PI)/180.0;
 130                 //double right = ((ray->h.azimuth + ((double)ray->h.beam_width/2.))*M_PI)/180.0;
 131
 132                 double lx = sin(left);
 133                 double ly = cos(left);
 134
 135                 double near_dist = ray->h.range_bin1;
 136                 double far_dist  = ray->h.nbins*ray->h.gate_size + ray->h.range_bin1;
 137
 138                 /* (find middle of bin) / scale for opengl */
 139                 // near left
 140                 glTexCoord2f(0.0, (double)ri/sweep->h.nrays);
 141                 glVertex3f(lx*near_dist, ly*near_dist, 0.0);
 142
 143                 // far  left
 144                 glTexCoord2f(1.0, (double)ri/sweep->h.nrays);
 145                 glVertex3f(lx*far_dist,  ly*far_dist,  0.0);
 146         }
 147         //g_print("ri=%d, nr=%d, bw=%f\n", _ri, sweep->h.nrays, sweep->h.beam_width);
 148         glEnd();
 149
 150         /* Texture debug */
 151         //glBegin(GL_QUADS);
 152         //glTexCoord2d( 0.,  0.); glVertex3f(-1.,  0., 0.); // bot left
 153         //glTexCoord2d( 0.,  1.); glVertex3f(-1.,  1., 0.); // top left
 154         //glTexCoord2d( 1.,  1.); glVertex3f( 0.,  1., 0.); // top right
 155         //glTexCoord2d( 1.,  0.); glVertex3f( 0.,  0., 0.); // bot right
 156         //glEnd();
 157
 158         /* Print the color table */
 159         glDisable(GL_TEXTURE_2D);
 160         glPushMatrix();
 161         glLoadIdentity();
 162         glBegin(GL_QUADS);
 163         int i;
 164         for (i = 0; i < nred; i++) {
 165                 glColor4ub(red[i], green[i], blue[i], get_alpha(i));
 166                 glVertex3f(-1., (float)((i  ) - nred/2)/(nred/2), 0.); // bot left
 167                 glVertex3f(-1., (float)((i+1) - nred/2)/(nred/2), 0.); // top left
 168                 glVertex3f(-.9, (float)((i+1) - nred/2)/(nred/2), 0.); // top right
 169                 glVertex3f(-.9, (float)((i  ) - nred/2)/(nred/2), 0.); // bot right
 170         }
 171         glEnd();
 172         glPopMatrix();
 173
 174         return FALSE;
 175 }
 176
 177 gboolean radar_init(GtkDrawingArea *_drawing, GtkNotebook *config)
 178 {
 179         drawing = GTK_WIDGET(_drawing);
 180
 181         /* Parse hard coded file.. */
 182         RSL_read_these_sweeps("all", NULL);
 183         //RSL_read_these_sweeps("all", NULL);
 184         Radar *radar = RSL_wsr88d_to_radar("/scratch/aweather/data/level2/KNQA_20090501_1925.raw", "KNQA");
 185         RSL_load_refl_color_table();
 186         RSL_get_color_table(RSL_RED_TABLE,   red,   &nred);
 187         RSL_get_color_table(RSL_GREEN_TABLE, green, &ngreen);
 188         RSL_get_color_table(RSL_BLUE_TABLE,  blue,  &nblue);
 189         if (radar->h.nvolumes < 1 || radar->v[0]->h.nsweeps < 1)
 190                 g_print("No sweeps found\n");
 191
 192         /* Add configuration tab */
 193         GtkWidget *hbox = gtk_hbox_new(TRUE, 0);
 194         GtkWidget *button = NULL;
 195         int vi = 0, si = 0;
 196         for (vi = 0; vi < radar->h.nvolumes; vi++) {
 197                 Volume *vol = radar->v[vi];
 198                 if (vol == NULL) continue;
 199                 GtkWidget *vbox = gtk_vbox_new(TRUE, 0);
 200                 gtk_box_pack_start(GTK_BOX(hbox), vbox, TRUE, TRUE, 0);
 201                 for (si = 0; si < vol->h.nsweeps; si++) {
 202                         Sweep *sweep = vol->sweep[si];
 203                         if (sweep == NULL) continue;
 204                         char *label = g_strdup_printf("Tilt: %.2f (%s)", sweep->h.elev, vol->h.type_str);
 205                         button = gtk_radio_button_new_with_label_from_widget(GTK_RADIO_BUTTON(button), label);
 206                         g_signal_connect_swapped(button, "clicked", G_CALLBACK(load_sweep), sweep);
 207                         gtk_box_pack_start(GTK_BOX(vbox), button, TRUE, TRUE, 0);
 208                         g_free(label);
 209                 }
 210         }
 211         GtkWidget *label = gtk_label_new("Radar");
 212         gtk_notebook_append_page(GTK_NOTEBOOK(config), hbox, label);
 213
 214         /* Set up OpenGL Stuff */
 215         g_signal_connect(drawing, "expose-event",    G_CALLBACK(expose),    NULL);
 216         g_signal_connect(drawing, "configure-event", G_CALLBACK(configure), radar->v[0]->sweep[0]);
 217
 218         return TRUE;
 219 }