src/vikdemlayer.c

   1 /*
   2  * viking -- GPS Data and Topo Analyzer, Explorer, and Manager
   3  *
   4  * Copyright (C) 2003-2005, Evan Battaglia <gtoevan@gmx.net>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  *
  20  */
  21 #include <math.h>
  22 #include <sys/types.h>
  23 #include <sys/stat.h>
  24 #include <string.h>
  25 #include <stdlib.h>
  26
  27 #include "config.h"
  28 #include "globals.h"
  29 #include "coords.h"
  30 #include "vikcoord.h"
  31 #include "download.h"
  32 #include "background.h"
  33 #include "vikwaypoint.h"
  34 #include "viktrack.h"
  35 #include "vikviewport.h"
  36 #include "viktreeview.h"
  37 #include "viklayer.h"
  38 #include "vikaggregatelayer.h"
  39 #include "viklayerspanel.h"
  40 #include "vikdemlayer.h"
  41 #include "vikdemlayer_pixmap.h"
  42 #include "vikmapslayer.h"
  43 #include "dialog.h"
  44
  45 #include "dem.h"
  46 #include "dems.h"
  47
  48 #define MAPS_CACHE_DIR maps_layer_default_dir()
  49
  50 #define SRTM_CACHE_TEMPLATE "%ssrtm3-%s%c%02d%c%03d.hgt.zip"
  51 #define SRTM_FTP_SITE "e0srp01u.ecs.nasa.gov"
  52 #define SRTM_FTP_URI  "/srtm/version2/SRTM3/"
  53
  54 #ifdef VIK_CONFIG_DEM24K
  55 #define DEM24K_DOWNLOAD_SCRIPT "dem24k.pl"
  56 #endif
  57
  58
  59 static VikDEMLayer *dem_layer_copy ( VikDEMLayer *vdl, gpointer vp );
  60 static void dem_layer_marshall( VikDEMLayer *vdl, guint8 **data, gint *len );
  61 static VikDEMLayer *dem_layer_unmarshall( guint8 *data, gint len, VikViewport *vvp );
  62 static gboolean dem_layer_set_param ( VikDEMLayer *vdl, guint16 id, VikLayerParamData data, VikViewport *vp );
  63 static VikLayerParamData dem_layer_get_param ( VikDEMLayer *vdl, guint16 id );
  64 static void dem_layer_update_gc ( VikDEMLayer *vdl, VikViewport *vp, const gchar *color );
  65 static void dem_layer_post_read ( VikLayer *vl, VikViewport *vp, gboolean from_file );
  66 static void srtm_draw_existence ( VikViewport *vp );
  67
  68 #ifdef VIK_CONFIG_DEM24K
  69 static void dem24k_draw_existence ( VikViewport *vp );
  70 #endif
  71
  72 static VikLayerParamScale param_scales[] = {
  73   { 1, 10000, 10, 1 },
  74   { 1, 10, 1, 0 },
  75 };
  76
  77 static gchar *params_source[] = {
  78         "SRTM Global 90m (3 arcsec)",
  79 #ifdef VIK_CONFIG_DEM24K
  80         "USA 10m (USGS 24k)",
  81 #endif
  82         "None",
  83         };
  84
  85 enum { DEM_SOURCE_SRTM,
  86 #ifdef VIK_CONFIG_DEM24K
  87        DEM_SOURCE_DEM24K,
  88 #endif
  89        DEM_SOURCE_NONE,
  90      };
  91
  92 static VikLayerParam dem_layer_params[] = {
  93   { "files", VIK_LAYER_PARAM_STRING_LIST, VIK_LAYER_GROUP_NONE, "DEM Files:", VIK_LAYER_WIDGET_FILELIST },
  94   { "source", VIK_LAYER_PARAM_UINT, VIK_LAYER_GROUP_NONE, "Download Source:", VIK_LAYER_WIDGET_RADIOGROUP_STATIC, params_source, NULL },
  95   { "color", VIK_LAYER_PARAM_STRING, VIK_LAYER_GROUP_NONE, "Color:", VIK_LAYER_WIDGET_ENTRY },
  96   { "max_elev", VIK_LAYER_PARAM_DOUBLE, VIK_LAYER_GROUP_NONE, "Max Elev:", VIK_LAYER_WIDGET_SPINBUTTON, param_scales + 0 },
  97   { "line_thickness", VIK_LAYER_PARAM_UINT, VIK_LAYER_GROUP_NONE, "Line Thickness:", VIK_LAYER_WIDGET_SPINBUTTON, param_scales + 1 },
  98 };
  99
 100
 101 enum { PARAM_FILES=0, PARAM_SOURCE, PARAM_COLOR, PARAM_MAX_ELEV, PARAM_LINE_THICKNESS, NUM_PARAMS };
 102
 103 static gpointer dem_layer_download_create ( VikWindow *vw, VikViewport *vvp);
 104 static gboolean dem_layer_download_release ( VikDEMLayer *vdl, GdkEventButton *event, VikViewport *vvp );
 105 static gboolean dem_layer_download_click ( VikDEMLayer *vdl, GdkEventButton *event, VikViewport *vvp );
 106
 107 static VikToolInterface dem_tools[] = {
 108   { "DEM Download/Import", (VikToolConstructorFunc) dem_layer_download_create, NULL, NULL, NULL,
 109     (VikToolMouseFunc) dem_layer_download_click, NULL,  (VikToolMouseFunc) dem_layer_download_release },
 110 };
 111
 112
 113 /*
 114 */
 115
 116 static gchar *dem_colors[] = {
 117 "#0000FF",
 118 "#9b793c",
 119 "#9c7d40",
 120 "#9d8144",
 121 "#9e8549",
 122 "#9f894d",
 123 "#a08d51",
 124 "#a29156",
 125 "#a3955a",
 126 "#a4995e",
 127 "#a69d63",
 128 "#a89f65",
 129 "#aaa267",
 130 "#ada569",
 131 "#afa76b",
 132 "#b1aa6d",
 133 "#b4ad6f",
 134 "#b6b071",
 135 "#b9b373",
 136 "#bcb676",
 137 "#beb978",
 138 "#c0bc7a",
 139 "#c2c07d",
 140 "#c4c37f",
 141 "#c6c681",
 142 "#c8ca84",
 143 "#cacd86",
 144 "#ccd188",
 145 "#cfd58b",
 146 "#c2ce84",
 147 "#b5c87e",
 148 "#a9c278",
 149 "#9cbb71",
 150 "#8fb56b",
 151 "#83af65",
 152 "#76a95e",
 153 "#6aa358",
 154 "#5e9d52",
 155 "#63a055",
 156 "#69a458",
 157 "#6fa85c",
 158 "#74ac5f",
 159 "#7ab063",
 160 "#80b467",
 161 "#86b86a",
 162 "#8cbc6e",
 163 "#92c072",
 164 "#94c175",
 165 "#97c278",
 166 "#9ac47c",
 167 "#9cc57f",
 168 "#9fc682",
 169 "#a2c886",
 170 "#a4c989",
 171 "#a7cb8d",
 172 "#aacd91",
 173 "#afce99",
 174 "#b5d0a1",
 175 "#bbd2aa",
 176 "#c0d3b2",
 177 "#c6d5ba",
 178 "#ccd7c3",
 179 "#d1d9cb",
 180 "#d7dbd4",
 181 "#DDDDDD",
 182 "#e0e0e0",
 183 "#e4e4e4",
 184 "#e8e8e8",
 185 "#ebebeb",
 186 "#efefef",
 187 "#f3f3f3",
 188 "#f7f7f7",
 189 "#fbfbfb",
 190 "#ffffff"
 191 };
 192
 193 /*
 194 "#9b793c",
 195 "#9e8549",
 196 "#a29156",
 197 "#a69d63",
 198 "#ada569",
 199 "#b4ad6f",
 200 "#bcb676",
 201 "#c2c07d",
 202 "#c8ca84",
 203 "#cfd58b",
 204 "#a9c278",
 205 "#83af65",
 206 "#5e9d52",
 207 "#6fa85c",
 208 "#80b467",
 209 "#92c072",
 210 "#9ac47c",
 211 "#a2c886",
 212 "#aacd91",
 213 "#bbd2aa",
 214 "#ccd7c3",
 215 "#DDDDDD",
 216 "#e8e8e8",
 217 "#f3f3f3",
 218 "#FFFFFF"
 219 };
 220 */
 221
 222 static const guint DEM_N_COLORS = sizeof(dem_colors)/sizeof(dem_colors[0]);
 223
 224
 225 VikLayerInterface vik_dem_layer_interface = {
 226   "DEM",
 227   &demlayer_pixbuf,
 228
 229   dem_tools,
 230   sizeof(dem_tools) / sizeof(dem_tools[0]),
 231
 232   dem_layer_params,
 233   NUM_PARAMS,
 234   NULL,
 235   0,
 236
 237   VIK_MENU_ITEM_ALL,
 238
 239   (VikLayerFuncCreate)                  vik_dem_layer_create,
 240   (VikLayerFuncRealize)                 NULL,
 241                                         dem_layer_post_read,
 242   (VikLayerFuncFree)                    vik_dem_layer_free,
 243
 244   (VikLayerFuncProperties)              NULL,
 245   (VikLayerFuncDraw)                    vik_dem_layer_draw,
 246   (VikLayerFuncChangeCoordMode)         NULL,
 247
 248   (VikLayerFuncSetMenuItemsSelection)   NULL,
 249   (VikLayerFuncGetMenuItemsSelection)   NULL,
 250
 251   (VikLayerFuncAddMenuItems)            NULL,
 252   (VikLayerFuncSublayerAddMenuItems)    NULL,
 253
 254   (VikLayerFuncSublayerRenameRequest)   NULL,
 255   (VikLayerFuncSublayerToggleVisible)   NULL,
 256
 257   (VikLayerFuncCopy)                    dem_layer_copy,
 258   (VikLayerFuncMarshall)                dem_layer_marshall,
 259   (VikLayerFuncUnmarshall)              dem_layer_unmarshall,
 260
 261   (VikLayerFuncSetParam)                dem_layer_set_param,
 262   (VikLayerFuncGetParam)                dem_layer_get_param,
 263
 264   (VikLayerFuncReadFileData)            NULL,
 265   (VikLayerFuncWriteFileData)           NULL,
 266
 267   (VikLayerFuncDeleteItem)              NULL,
 268   (VikLayerFuncCopyItem)                NULL,
 269   (VikLayerFuncPasteItem)               NULL,
 270   (VikLayerFuncFreeCopiedItem)          NULL,
 271   (VikLayerFuncDragDropRequest)         NULL,
 272 };
 273
 274 struct _VikDEMLayer {
 275   VikLayer vl;
 276   GdkGC *gc;
 277   GdkGC **gcs;
 278   GList *files;
 279   gdouble max_elev;
 280   guint8 line_thickness;
 281   gchar *color;
 282   guint source;
 283 };
 284
 285 GType vik_dem_layer_get_type ()
 286 {
 287   static GType vdl_type = 0;
 288
 289   if (!vdl_type)
 290   {
 291     static const GTypeInfo vdl_info =
 292     {
 293       sizeof (VikDEMLayerClass),
 294       NULL, /* base_init */
 295       NULL, /* base_finalize */
 296       NULL, /* class init */
 297       NULL, /* class_finalize */
 298       NULL, /* class_data */
 299       sizeof (VikDEMLayer),
 300       0,
 301       NULL /* instance init */
 302     };
 303     vdl_type = g_type_register_static ( VIK_LAYER_TYPE, "VikDEMLayer", &vdl_info, 0 );
 304   }
 305
 306   return vdl_type;
 307 }
 308
 309 static VikDEMLayer *dem_layer_copy ( VikDEMLayer *vdl, gpointer vp )
 310 {
 311   VikDEMLayer *rv = vik_dem_layer_new ( );
 312   gint i;
 313
 314   rv->files = a_dems_list_copy ( vdl->files );
 315
 316   for ( i = 0; i < DEM_N_COLORS; i++ ) {
 317     rv->gcs[i] = vdl->gcs[i];
 318     g_object_ref ( rv->gcs[i] );
 319   }
 320
 321   rv->source = vdl->source;
 322   rv->max_elev = vdl->max_elev;
 323   rv->line_thickness = vdl->line_thickness;
 324
 325   rv->color = g_strdup ( vdl->color );
 326   rv->gc = vdl->gc;
 327   g_object_ref ( rv->gc );
 328   return rv;
 329 }
 330
 331 static void dem_layer_marshall( VikDEMLayer *vdl, guint8 **data, gint *len )
 332 {
 333   vik_layer_marshall_params ( VIK_LAYER(vdl), data, len );
 334 }
 335
 336 static VikDEMLayer *dem_layer_unmarshall( guint8 *data, gint len, VikViewport *vvp )
 337 {
 338   VikDEMLayer *rv = vik_dem_layer_new ();
 339   gint i;
 340
 341   /* TODO: share GCS between layers */
 342   for ( i = 0; i < DEM_N_COLORS; i++ )
 343     rv->gcs[i] = vik_viewport_new_gc ( vvp, dem_colors[i], rv->line_thickness );
 344
 345   vik_layer_unmarshall_params ( VIK_LAYER(rv), data, len, vvp );
 346   return rv;
 347 }
 348
 349 gboolean dem_layer_set_param ( VikDEMLayer *vdl, guint16 id, VikLayerParamData data, VikViewport *vp )
 350 {
 351   switch ( id )
 352   {
 353     case PARAM_COLOR: if ( vdl->color ) g_free ( vdl->color ); vdl->color = g_strdup ( data.s ); break;
 354     case PARAM_SOURCE: vdl->source = data.u; break;
 355     case PARAM_MAX_ELEV: vdl->max_elev = data.d; break;
 356     case PARAM_LINE_THICKNESS: if ( data.u >= 1 && data.u <= 15 ) vdl->line_thickness = data.u; break;
 357     case PARAM_FILES: a_dems_load_list ( &(data.sl) ); a_dems_list_free ( vdl->files ); vdl->files = data.sl; break;
 358   }
 359   return TRUE;
 360 }
 361
 362 static VikLayerParamData dem_layer_get_param ( VikDEMLayer *vdl, guint16 id )
 363 {
 364   VikLayerParamData rv;
 365   switch ( id )
 366   {
 367     case PARAM_FILES: rv.sl = vdl->files; break;
 368     case PARAM_SOURCE: rv.u = vdl->source; break;
 369     case PARAM_COLOR: rv.s = vdl->color ? vdl->color : ""; break;
 370     case PARAM_MAX_ELEV: rv.d = vdl->max_elev; break;
 371     case PARAM_LINE_THICKNESS: rv.i = vdl->line_thickness; break;
 372   }
 373   return rv;
 374 }
 375
 376 static void dem_layer_post_read ( VikLayer *vl, VikViewport *vp, gboolean from_file )
 377 {
 378   VikDEMLayer *vdl = VIK_DEM_LAYER(vl);
 379   if ( vdl->gc )
 380     g_object_unref ( G_OBJECT(vdl->gc) );
 381
 382   vdl->gc = vik_viewport_new_gc ( vp, vdl->color, vdl->line_thickness );
 383 }
 384
 385 VikDEMLayer *vik_dem_layer_new ( )
 386 {
 387   VikDEMLayer *vdl = VIK_DEM_LAYER ( g_object_new ( VIK_DEM_LAYER_TYPE, NULL ) );
 388
 389   vik_layer_init ( VIK_LAYER(vdl), VIK_LAYER_DEM );
 390
 391   vdl->files = NULL;
 392
 393
 394   vdl->gc = NULL;
 395
 396   vdl->gcs = g_malloc(sizeof(GdkGC *)*DEM_N_COLORS);
 397   /* make new gcs only if we need it (copy layer -> use old) */
 398
 399   vdl->max_elev = 1000.0;
 400   vdl->source = DEM_SOURCE_SRTM;
 401   vdl->line_thickness = 3;
 402   vdl->color = NULL;
 403   return vdl;
 404 }
 405
 406
 407
 408 static void vik_dem_layer_draw_dem ( VikDEMLayer *vdl, VikViewport *vp, VikDEM *dem )
 409 {
 410   VikDEMColumn *column;
 411
 412   struct LatLon dem_northeast, dem_southwest;
 413   gdouble max_lat, max_lon, min_lat, min_lon;
 414
 415   /**** Check if viewport and DEM data overlap ****/
 416
 417   /* get min, max lat/lon of viewport */
 418   vik_viewport_get_min_max_lat_lon ( vp, &min_lat, &max_lat, &min_lon, &max_lon );
 419
 420   /* get min, max lat/lon of DEM data */
 421   if ( dem->horiz_units == VIK_DEM_HORIZ_LL_ARCSECONDS ) {
 422     dem_northeast.lat = dem->max_north / 3600.0;
 423     dem_northeast.lon = dem->max_east / 3600.0;
 424     dem_southwest.lat = dem->min_north / 3600.0;
 425     dem_southwest.lon = dem->min_east / 3600.0;
 426   } else if ( dem->horiz_units == VIK_DEM_HORIZ_UTM_METERS ) {
 427     struct UTM dem_northeast_utm, dem_southwest_utm;
 428     dem_northeast_utm.northing = dem->max_north;
 429     dem_northeast_utm.easting = dem->max_east;
 430     dem_southwest_utm.northing = dem->min_north;
 431     dem_southwest_utm.easting = dem->min_east;
 432     dem_northeast_utm.zone = dem_southwest_utm.zone = dem->utm_zone;
 433     dem_northeast_utm.letter = dem_southwest_utm.letter = dem->utm_letter;
 434
 435     a_coords_utm_to_latlon(&dem_northeast_utm, &dem_northeast);
 436     a_coords_utm_to_latlon(&dem_southwest_utm, &dem_southwest);
 437   }
 438
 439   if ( (max_lat > dem_northeast.lat && min_lat > dem_northeast.lat) ||
 440        (max_lat < dem_southwest.lat && min_lat < dem_southwest.lat) )
 441     return;
 442   else if ( (max_lon > dem_northeast.lon && min_lon > dem_northeast.lon) ||
 443             (max_lon < dem_southwest.lon && min_lon < dem_southwest.lon) )
 444     return;
 445   /* else they overlap */
 446
 447   /**** End Overlap Check ****/
 448   /* boxes to show where we have DEM instead of actually drawing the DEM.
 449    * useful if we want to see what areas we have coverage for (if we want
 450    * to get elevation data for a track) but don't want to cover the map.
 451    */
 452
 453   #if 0
 454   /* draw a box if a DEM is loaded. in future I'd like to add an option for this
 455    * this is useful if we want to see what areas we have dem for but don't want to
 456    * cover the map (or maybe we just need translucent DEM?) */
 457   {
 458     VikCoord demne, demsw;
 459     gint x1, y1, x2, y2;
 460     vik_coord_load_from_latlon(&demne, vik_viewport_get_coord_mode(vp), &dem_northeast);
 461     vik_coord_load_from_latlon(&demsw, vik_viewport_get_coord_mode(vp), &dem_southwest);
 462
 463     vik_viewport_coord_to_screen ( vp, &demne, &x1, &y1 );
 464     vik_viewport_coord_to_screen ( vp, &demsw, &x2, &y2 );
 465
 466     if ( x1 > vik_viewport_get_width(vp) ) x1=vik_viewport_get_width(vp);
 467     if ( y2 > vik_viewport_get_height(vp) ) y2=vik_viewport_get_height(vp);
 468     if ( x2 < 0 ) x2 = 0;
 469     if ( y1 < 0 ) y1 = 0;
 470     vik_viewport_draw_rectangle ( vp, GTK_WIDGET(vp)->style->black_gc,
 471         FALSE, x2, y1, x1-x2, y2-y1 );
 472     return;
 473   }
 474   #endif
 475
 476   if ( dem->horiz_units == VIK_DEM_HORIZ_LL_ARCSECONDS ) {
 477     VikCoord tmp; /* TODO: don't use coord_load_from_latlon, especially if in latlon drawing mode */
 478
 479     gdouble max_lat_as, max_lon_as, min_lat_as, min_lon_as;
 480     gdouble start_lat_as, end_lat_as, start_lon_as, end_lon_as;
 481
 482     gdouble start_lat, end_lat, start_lon, end_lon;
 483
 484     struct LatLon counter;
 485
 486     guint x, y, start_x, start_y;
 487
 488     gint16 elev;
 489
 490     guint skip_factor = ceil ( vik_viewport_get_xmpp(vp) / 40 ); /* todo: smarter calculation. */
 491
 492     gdouble nscale_deg = dem->north_scale / ((gdouble) 3600);
 493     gdouble escale_deg = dem->east_scale / ((gdouble) 3600);
 494
 495     max_lat_as = max_lat * 3600;
 496     min_lat_as = min_lat * 3600;
 497     max_lon_as = max_lon * 3600;
 498     min_lon_as = min_lon * 3600;
 499
 500     start_lat_as = MAX(min_lat_as, dem->min_north);
 501     end_lat_as   = MIN(max_lat_as, dem->max_north);
 502     start_lon_as = MAX(min_lon_as, dem->min_east);
 503     end_lon_as   = MIN(max_lon_as, dem->max_east);
 504
 505     start_lat = floor(start_lat_as / dem->north_scale) * nscale_deg;
 506     end_lat   = ceil (end_lat_as / dem->north_scale) * nscale_deg;
 507     start_lon = floor(start_lon_as / dem->east_scale) * escale_deg;
 508     end_lon   = ceil (end_lon_as / dem->east_scale) * escale_deg;
 509
 510     vik_dem_east_north_to_xy ( dem, start_lon_as, start_lat_as, &start_x, &start_y );
 511
 512     for ( x=start_x, counter.lon = start_lon; counter.lon <= end_lon; counter.lon += escale_deg * skip_factor, x += skip_factor ) {
 513       if ( x > 0 && x < dem->n_columns ) {
 514         column = g_ptr_array_index ( dem->columns, x );
 515         for ( y=start_y, counter.lat = start_lat; counter.lat <= end_lat; counter.lat += nscale_deg * skip_factor, y += skip_factor ) {
 516           if ( y > column->n_points )
 517             break;
 518           elev = column->points[y];
 519           if ( elev > vdl->max_elev ) elev=vdl->max_elev;
 520           {
 521             gint a, b;
 522
 523             vik_coord_load_from_latlon(&tmp, vik_viewport_get_coord_mode(vp), &counter);
 524             vik_viewport_coord_to_screen(vp, &tmp, &a, &b);
 525             if ( elev == VIK_DEM_INVALID_ELEVATION )
 526               ; /* don't draw it */
 527             else if ( elev <= 0 )
 528               vik_viewport_draw_rectangle(vp, vdl->gcs[0], TRUE, a-2, b-2, 4, 4 );
 529             else
 530               vik_viewport_draw_rectangle(vp, vdl->gcs[(gint)floor(elev/vdl->max_elev*(DEM_N_COLORS-2))+1], TRUE, a-2, b-2, 4, 4 );
 531           }
 532         } /* for y= */
 533       }
 534     } /* for x= */
 535   } else if ( dem->horiz_units == VIK_DEM_HORIZ_UTM_METERS ) {
 536     gdouble max_nor, max_eas, min_nor, min_eas;
 537     gdouble start_nor, start_eas, end_nor, end_eas;
 538
 539     gint16 elev;
 540
 541     guint x, y, start_x, start_y;
 542
 543     VikCoord tmp; /* TODO: don't use coord_load_from_latlon, especially if in latlon drawing mode */
 544     struct UTM counter;
 545
 546     guint skip_factor = ceil ( vik_viewport_get_xmpp(vp) / 10 ); /* todo: smarter calculation. */
 547
 548     VikCoord tleft, tright, bleft, bright;
 549
 550     vik_viewport_screen_to_coord ( vp, 0, 0, &tleft );
 551     vik_viewport_screen_to_coord ( vp, vik_viewport_get_width(vp), 0, &tright );
 552     vik_viewport_screen_to_coord ( vp, 0, vik_viewport_get_height(vp), &bleft );
 553     vik_viewport_screen_to_coord ( vp, vik_viewport_get_width(vp), vik_viewport_get_height(vp), &bright );
 554
 555
 556     vik_coord_convert(&tleft, VIK_COORD_UTM);
 557     vik_coord_convert(&tright, VIK_COORD_UTM);
 558     vik_coord_convert(&bleft, VIK_COORD_UTM);
 559     vik_coord_convert(&bright, VIK_COORD_UTM);
 560
 561     max_nor = MAX(tleft.north_south, tright.north_south);
 562     min_nor = MIN(bleft.north_south, bright.north_south);
 563     max_eas = MAX(bright.east_west, tright.east_west);
 564     min_eas = MIN(bleft.east_west, tleft.east_west);
 565
 566     start_nor = MAX(min_nor, dem->min_north);
 567     end_nor   = MIN(max_nor, dem->max_north);
 568     if ( tleft.utm_zone == dem->utm_zone && bleft.utm_zone == dem->utm_zone
 569          && (tleft.utm_letter >= 'N') == (dem->utm_letter >= 'N')
 570          && (bleft.utm_letter >= 'N') == (dem->utm_letter >= 'N') ) /* if the utm zones/hemispheres are different, min_eas will be bogus */
 571       start_eas = MAX(min_eas, dem->min_east);
 572     else
 573       start_eas = dem->min_east;
 574     if ( tright.utm_zone == dem->utm_zone && bright.utm_zone == dem->utm_zone
 575          && (tright.utm_letter >= 'N') == (dem->utm_letter >= 'N')
 576          && (bright.utm_letter >= 'N') == (dem->utm_letter >= 'N') ) /* if the utm zones/hemispheres are different, min_eas will be bogus */
 577       end_eas = MIN(max_eas, dem->max_east);
 578     else
 579       end_eas = dem->max_east;
 580
 581     start_nor = floor(start_nor / dem->north_scale) * dem->north_scale;
 582     end_nor   = ceil (end_nor / dem->north_scale) * dem->north_scale;
 583     start_eas = floor(start_eas / dem->east_scale) * dem->east_scale;
 584     end_eas   = ceil (end_eas / dem->east_scale) * dem->east_scale;
 585
 586     vik_dem_east_north_to_xy ( dem, start_eas, start_nor, &start_x, &start_y );
 587
 588     /* TODO: why start_x and start_y are -1 -- rounding error from above? */
 589
 590     counter.zone = dem->utm_zone;
 591     counter.letter = dem->utm_letter;
 592
 593     for ( x=start_x, counter.easting = start_eas; counter.easting <= end_eas; counter.easting += dem->east_scale * skip_factor, x += skip_factor ) {
 594       if ( x > 0 && x < dem->n_columns ) {
 595         column = g_ptr_array_index ( dem->columns, x );
 596         for ( y=start_y, counter.northing = start_nor; counter.northing <= end_nor; counter.northing += dem->north_scale * skip_factor, y += skip_factor ) {
 597           if ( y > column->n_points )
 598             continue;
 599           elev = column->points[y];
 600           if ( elev > vdl->max_elev ) elev=vdl->max_elev;
 601           {
 602             gint a, b;
 603             vik_coord_load_from_utm(&tmp, vik_viewport_get_coord_mode(vp), &counter);
 604                     vik_viewport_coord_to_screen(vp, &tmp, &a, &b);
 605             if ( elev == VIK_DEM_INVALID_ELEVATION )
 606               ; /* don't draw it */
 607             else if ( elev <= 0 )
 608               vik_viewport_draw_rectangle(vp, vdl->gcs[0], TRUE, a-2, b-2, 4, 4 );
 609             else
 610               vik_viewport_draw_rectangle(vp, vdl->gcs[(gint)floor(elev/vdl->max_elev*(DEM_N_COLORS-2))+1], TRUE, a-2, b-2, 4, 4 );
 611           }
 612         } /* for y= */
 613       }
 614     } /* for x= */
 615   }
 616 }
 617
 618 /* return the continent for the specified lat, lon */
 619 /* TODO */
 620 const gchar *srtm_continent_dir ( gint lat, gint lon )
 621 {
 622   return "North_America/";
 623 }
 624
 625 void vik_dem_layer_draw ( VikDEMLayer *vdl, gpointer data )
 626 {
 627   VikViewport *vp = (VikViewport *) data;
 628   GList *dems_iter = vdl->files;
 629   VikDEM *dem;
 630
 631
 632   /* search for SRTM3 90m */
 633
 634   if ( vdl->source == DEM_SOURCE_SRTM )
 635     srtm_draw_existence ( vp );
 636 #ifdef VIK_CONFIG_DEM24K
 637   else if ( vdl->source == DEM_SOURCE_DEM24K )
 638     dem24k_draw_existence ( vp );
 639 #endif
 640
 641   while ( dems_iter ) {
 642     dem = a_dems_get ( (const char *) (dems_iter->data) );
 643     if ( dem )
 644       vik_dem_layer_draw_dem ( vdl, vp, dem );
 645     dems_iter = dems_iter->next;
 646   }
 647 }
 648
 649 void vik_dem_layer_free ( VikDEMLayer *vdl )
 650 {
 651   gint i;
 652   if ( vdl->gc != NULL )
 653     g_object_unref ( G_OBJECT(vdl->gc) );
 654
 655   if ( vdl->color != NULL )
 656     g_free ( vdl->color );
 657
 658   if ( vdl->gcs )
 659     for ( i = 0; i < DEM_N_COLORS; i++ )
 660       g_object_unref ( vdl->gcs[i] );
 661   g_free ( vdl->gcs );
 662
 663   a_dems_list_free ( vdl->files );
 664 }
 665
 666 static void dem_layer_update_gc ( VikDEMLayer *vdl, VikViewport *vp, const gchar *color )
 667 {
 668   if ( vdl->color )
 669     g_free ( vdl->color );
 670
 671   vdl->color = g_strdup ( color );
 672
 673   if ( vdl->gc )
 674     g_object_unref ( G_OBJECT(vdl->gc) );
 675
 676   vdl->gc = vik_viewport_new_gc ( vp, vdl->color, vdl->line_thickness );
 677 }
 678
 679 VikDEMLayer *vik_dem_layer_create ( VikViewport *vp )
 680 {
 681   VikDEMLayer *vdl = vik_dem_layer_new ();
 682   gint i;
 683
 684   /* TODO: share GCS between layers */
 685   for ( i = 0; i < DEM_N_COLORS; i++ )
 686     vdl->gcs[i] = vik_viewport_new_gc ( vp, dem_colors[i], vdl->line_thickness );
 687
 688   dem_layer_update_gc ( vdl, vp, "red" );
 689   return vdl;
 690 }
 691 /**************************************************************
 692  **** SOURCES & DOWNLOADING
 693  **************************************************************/
 694 typedef struct {
 695   gchar *dest;
 696   gdouble lat, lon;
 697
 698   GMutex *mutex;
 699   VikDEMLayer *vdl; /* NULL if not alive */
 700
 701   guint source;
 702 } DEMDownloadParams;
 703
 704
 705 /**************************************************
 706  *  SOURCE: SRTM                                  *
 707  **************************************************/
 708
 709 static void srtm_dem_download_thread ( DEMDownloadParams *p, gpointer threaddata )
 710 {
 711   gint intlat, intlon;
 712
 713   intlat = (int)floor(p->lat);
 714   intlon = (int)floor(p->lon);
 715   gchar *src_fn = g_strdup_printf("%s%s%c%02d%c%03d.hgt.zip",
 716                 SRTM_FTP_URI,
 717                 srtm_continent_dir(intlat, intlon),
 718                 (intlat >= 0) ? 'N' : 'S',
 719                 ABS(intlat),
 720                 (intlon >= 0) ? 'E' : 'W',
 721                 ABS(intlon) );
 722
 723   DownloadOptions options = { NULL, 0 };
 724   a_ftp_download_get_url ( SRTM_FTP_SITE, src_fn, p->dest, &options );
 725   g_free ( src_fn );
 726 }
 727
 728 static gchar *srtm_lat_lon_to_dest_fn ( gdouble lat, gdouble lon )
 729 {
 730   gint intlat, intlon;
 731   intlat = (int)floor(lat);
 732   intlon = (int)floor(lon);
 733   return g_strdup_printf("srtm3-%s%c%02d%c%03d.hgt.zip",
 734                 srtm_continent_dir(intlat, intlon),
 735                 (intlat >= 0) ? 'N' : 'S',
 736                 ABS(intlat),
 737                 (intlon >= 0) ? 'E' : 'W',
 738                 ABS(intlon) );
 739
 740 }
 741
 742 /* TODO: generalize */
 743 static void srtm_draw_existence ( VikViewport *vp )
 744 {
 745   gdouble max_lat, max_lon, min_lat, min_lon;
 746   gchar buf[strlen(MAPS_CACHE_DIR)+strlen(SRTM_CACHE_TEMPLATE)+30];
 747   gint i, j;
 748
 749   vik_viewport_get_min_max_lat_lon ( vp, &min_lat, &max_lat, &min_lon, &max_lon );
 750
 751   for (i = floor(min_lat); i <= floor(max_lat); i++) {
 752     for (j = floor(min_lon); j <= floor(max_lon); j++) {
 753       g_snprintf(buf, sizeof(buf), SRTM_CACHE_TEMPLATE,
 754                 MAPS_CACHE_DIR,
 755                 srtm_continent_dir(i, j),
 756                 (i >= 0) ? 'N' : 'S',
 757                 ABS(i),
 758                 (j >= 0) ? 'E' : 'W',
 759                 ABS(j) );
 760       if ( access(buf, F_OK ) == 0 ) {
 761         VikCoord ne, sw;
 762         gint x1, y1, x2, y2;
 763         sw.north_south = i;
 764         sw.east_west = j;
 765         sw.mode = VIK_COORD_LATLON;
 766         ne.north_south = i+1;
 767         ne.east_west = j+1;
 768         ne.mode = VIK_COORD_LATLON;
 769         vik_viewport_coord_to_screen ( vp, &sw, &x1, &y1 );
 770         vik_viewport_coord_to_screen ( vp, &ne, &x2, &y2 );
 771         if ( x1 < 0 ) x1 = 0;
 772         if ( y2 < 0 ) y2 = 0;
 773         vik_viewport_draw_rectangle ( vp, GTK_WIDGET(vp)->style->black_gc,
 774                 FALSE, x1, y2, x2-x1, y1-y2 );
 775       }
 776     }
 777   }
 778 }
 779
 780
 781 /**************************************************
 782  *  SOURCE: USGS 24K                              *
 783  **************************************************/
 784
 785 #ifdef VIK_CONFIG_DEM24K
 786
 787 static void dem24k_dem_download_thread ( DEMDownloadParams *p, gpointer threaddata )
 788 {
 789   /* TODO: dest dir */
 790   gchar *cmdline = g_strdup_printf("%s %.03f %.03f",
 791         DEM24K_DOWNLOAD_SCRIPT,
 792         floor(p->lat*8)/8,
 793         ceil(p->lon*8)/8 );
 794   /* FIX: don't use system, use execv or something. check for existence */
 795   system(cmdline);
 796 }
 797
 798 static gchar *dem24k_lat_lon_to_dest_fn ( gdouble lat, gdouble lon )
 799 {
 800   return g_strdup_printf("dem24k/%d/%d/%.03f,%.03f.dem",
 801         (gint) lat,
 802         (gint) lon,
 803         floor(lat*8)/8,
 804         ceil(lon*8)/8);
 805 }
 806
 807 /* TODO: generalize */
 808 static void dem24k_draw_existence ( VikViewport *vp )
 809 {
 810   gdouble max_lat, max_lon, min_lat, min_lon;
 811   gchar buf[strlen(MAPS_CACHE_DIR)+40];
 812   gdouble i, j;
 813
 814   vik_viewport_get_min_max_lat_lon ( vp, &min_lat, &max_lat, &min_lon, &max_lon );
 815
 816   for (i = floor(min_lat*8)/8; i <= floor(max_lat*8)/8; i+=0.125) {
 817     /* check lat dir first -- faster */
 818     g_snprintf(buf, sizeof(buf), "%sdem24k/%d/",
 819         MAPS_CACHE_DIR,
 820         (gint) i );
 821     if ( access(buf, F_OK) != 0 )
 822       continue;
 823     for (j = floor(min_lon*8)/8; j <= floor(max_lon*8)/8; j+=0.125) {
 824       /* check lon dir first -- faster */
 825       g_snprintf(buf, sizeof(buf), "%sdem24k/%d/%d/",
 826         MAPS_CACHE_DIR,
 827         (gint) i,
 828         (gint) j );
 829       if ( access(buf, F_OK) != 0 )
 830         continue;
 831       g_snprintf(buf, sizeof(buf), "%sdem24k/%d/%d/%.03f,%.03f.dem",
 832                 MAPS_CACHE_DIR,
 833                 (gint) i,
 834                 (gint) j,
 835                 floor(i*8)/8,
 836                 floor(j*8)/8 );
 837       if ( access(buf, F_OK ) == 0 ) {
 838         VikCoord ne, sw;
 839         gint x1, y1, x2, y2;
 840         sw.north_south = i;
 841         sw.east_west = j-0.125;
 842         sw.mode = VIK_COORD_LATLON;
 843         ne.north_south = i+0.125;
 844         ne.east_west = j;
 845         ne.mode = VIK_COORD_LATLON;
 846         vik_viewport_coord_to_screen ( vp, &sw, &x1, &y1 );
 847         vik_viewport_coord_to_screen ( vp, &ne, &x2, &y2 );
 848         if ( x1 < 0 ) x1 = 0;
 849         if ( y2 < 0 ) y2 = 0;
 850         vik_viewport_draw_rectangle ( vp, GTK_WIDGET(vp)->style->black_gc,
 851                 FALSE, x1, y2, x2-x1, y1-y2 );
 852       }
 853     }
 854   }
 855 }
 856 #endif
 857
 858 /**************************************************
 859  *   SOURCES -- DOWNLOADING & IMPORTING TOOL      *
 860  **************************************************
 861  */
 862
 863 static void weak_ref_cb ( gpointer ptr, GObject * dead_vdl )
 864 {
 865   DEMDownloadParams *p = ptr;
 866   g_mutex_lock ( p->mutex );
 867   p->vdl = NULL;
 868   g_mutex_unlock ( p->mutex );
 869 }
 870
 871 /* Try to add file full_path.
 872  * full_path will be copied.
 873  * returns FALSE if file does not exists, TRUE otherwise.
 874  */
 875 static gboolean dem_layer_add_file ( VikDEMLayer *vdl, const gchar *full_path )
 876 {
 877   if ( access(full_path, F_OK ) == 0 ) {
 878     /* only load if file size is not 0 (not in progress */
 879     struct stat sb;
 880     stat (full_path, &sb);
 881     if ( sb.st_size ) {
 882       gchar *duped_path = g_strdup(full_path);
 883       vdl->files = g_list_prepend ( vdl->files, duped_path );
 884       a_dems_load ( duped_path );
 885       g_warning(duped_path);
 886       vik_layer_emit_update ( VIK_LAYER(vdl) );
 887     }
 888     return TRUE;
 889   } else
 890     return FALSE;
 891 }
 892
 893 static void dem_download_thread ( DEMDownloadParams *p, gpointer threaddata )
 894 {
 895   if ( p->source == DEM_SOURCE_SRTM )
 896     srtm_dem_download_thread ( p, threaddata );
 897 #ifdef VIK_CONFIG_DEM24K
 898   else if ( p->source == DEM_SOURCE_DEM24K )
 899     dem24k_dem_download_thread ( p, threaddata );
 900 #endif
 901
 902   gdk_threads_enter();
 903   g_mutex_lock ( p->mutex );
 904   if ( p->vdl ) {
 905     g_object_weak_unref ( G_OBJECT(p->vdl), weak_ref_cb, p );
 906
 907     if ( dem_layer_add_file ( p->vdl, p->dest ) )
 908       vik_layer_emit_update ( VIK_LAYER(p->vdl) );
 909   }
 910   g_mutex_unlock ( p->mutex );
 911   gdk_threads_leave();
 912 }
 913
 914
 915 static void free_dem_download_params ( DEMDownloadParams *p )
 916 {
 917   g_mutex_free ( p->mutex );
 918   g_free ( p->dest );
 919   g_free ( p );
 920 }
 921
 922 static gpointer dem_layer_download_create ( VikWindow *vw, VikViewport *vvp)
 923 {
 924   return vvp;
 925 }
 926
 927
 928 static gboolean dem_layer_download_release ( VikDEMLayer *vdl, GdkEventButton *event, VikViewport *vvp )
 929 {
 930   VikCoord coord;
 931   struct LatLon ll;
 932
 933   gchar *full_path;
 934   gchar *dem_file = NULL;
 935
 936   if ( vdl->source == DEM_SOURCE_NONE )
 937     a_dialog_error_msg ( VIK_GTK_WINDOW_FROM_LAYER(vdl), "No download source selected. Edit layer properties." );
 938
 939   vik_viewport_screen_to_coord ( vvp, event->x, event->y, &coord );
 940   vik_coord_to_latlon ( &coord, &ll );
 941
 942
 943   if ( vdl->source == DEM_SOURCE_SRTM )
 944     dem_file = srtm_lat_lon_to_dest_fn ( ll.lat, ll.lon );
 945 #ifdef VIK_CONFIG_DEM24K
 946   else if ( vdl->source == DEM_SOURCE_DEM24K )
 947     dem_file = dem24k_lat_lon_to_dest_fn ( ll.lat, ll.lon );
 948 #endif
 949
 950   if ( ! dem_file )
 951     return TRUE;
 952
 953   full_path = g_strdup_printf("%s%s", MAPS_CACHE_DIR, dem_file );
 954
 955   g_warning(full_path);
 956
 957   // TODO: check if already in filelist
 958
 959   if ( ! dem_layer_add_file(vdl, full_path) ) {
 960     gchar *tmp = g_strdup_printf ( "Downloading DEM %s ", dem_file );
 961     DEMDownloadParams *p = g_malloc(sizeof(DEMDownloadParams));
 962     p->dest = g_strdup(full_path);
 963     p->lat = ll.lat;
 964     p->lon = ll.lon;
 965     p->vdl = vdl;
 966     p->mutex = g_mutex_new();
 967     p->source = vdl->source;
 968     g_object_weak_ref(G_OBJECT(p->vdl), weak_ref_cb, p );
 969
 970     a_background_thread ( VIK_GTK_WINDOW_FROM_LAYER(vdl), tmp,
 971                 (vik_thr_func) dem_download_thread, p,
 972                 (vik_thr_free_func) free_dem_download_params, NULL, 1 );
 973   }
 974
 975   g_free ( dem_file );
 976   g_free ( full_path );
 977
 978   return TRUE;
 979 }
 980
 981 static gboolean dem_layer_download_click ( VikDEMLayer *vdl, GdkEventButton *event, VikViewport *vvp )
 982 {
 983 /* choose & keep track of cache dir
 984  * download in background thread
 985  * download over area */
 986   return TRUE;
 987 }
 988
 989