src/vikgeoreflayer.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
  22 #ifdef HAVE_CONFIG_H
  23 #include "config.h"
  24 #endif
  25
  26 #include "viking.h"
  27 #include <glib.h>
  28 #include <glib/gstdio.h>
  29 #include <glib/gi18n.h>
  30 #include <string.h>
  31
  32 #include "icons/icons.h"
  33
  34 VikLayerParam georef_layer_params[] = {
  35   { "image", VIK_LAYER_PARAM_STRING, VIK_LAYER_NOT_IN_PROPERTIES },
  36   { "corner_easting", VIK_LAYER_PARAM_DOUBLE, VIK_LAYER_NOT_IN_PROPERTIES },
  37   { "corner_northing", VIK_LAYER_PARAM_DOUBLE, VIK_LAYER_NOT_IN_PROPERTIES },
  38   { "mpp_easting", VIK_LAYER_PARAM_DOUBLE, VIK_LAYER_NOT_IN_PROPERTIES },
  39   { "mpp_northing", VIK_LAYER_PARAM_DOUBLE, VIK_LAYER_NOT_IN_PROPERTIES },
  40 };
  41
  42 enum { PARAM_IMAGE = 0, PARAM_CE, PARAM_CN, PARAM_ME, PARAM_MN, NUM_PARAMS };
  43
  44 static void georef_layer_marshall( VikGeorefLayer *vgl, guint8 **data, gint *len );
  45 static VikGeorefLayer *georef_layer_unmarshall( guint8 *data, gint len, VikViewport *vvp );
  46 static gboolean georef_layer_set_param ( VikGeorefLayer *vgl, guint16 id, VikLayerParamData data, VikViewport *vp );
  47 static VikLayerParamData georef_layer_get_param ( VikGeorefLayer *vgl, guint16 id );
  48 VikGeorefLayer *georef_layer_new ( );
  49 VikGeorefLayer *georef_layer_create ( VikViewport *vp );
  50 static void georef_layer_free ( VikGeorefLayer *vgl );
  51 gboolean georef_layer_properties ( VikGeorefLayer *vgl, gpointer vp );
  52 static void georef_layer_draw ( VikGeorefLayer *vgl, gpointer data );
  53 static void georef_layer_add_menu_items ( VikGeorefLayer *vgl, GtkMenu *menu, gpointer vlp );
  54 static void georef_layer_set_image ( VikGeorefLayer *vgl, const gchar *image );
  55 static gboolean georef_layer_dialog ( VikGeorefLayer **vgl, gpointer vp, GtkWindow *w );
  56 static void georef_layer_load_image ( VikGeorefLayer *vgl );
  57
  58 /* tools */
  59 static gpointer georef_layer_move_create ( VikWindow *vw, VikViewport *vvp);
  60 static gboolean georef_layer_move_release ( VikGeorefLayer *vgl, GdkEventButton *event, VikViewport *vvp );
  61 static gboolean georef_layer_move_press ( VikGeorefLayer *vgl, GdkEventButton *event, VikViewport *vvp );
  62 static gpointer georef_layer_zoom_create ( VikWindow *vw, VikViewport *vvp);
  63 static gboolean georef_layer_zoom_press ( VikGeorefLayer *vgl, GdkEventButton *event, VikViewport *vvp );
  64
  65 static VikToolInterface georef_tools[] = {
  66   { N_("Georef Move Map"), (VikToolConstructorFunc) georef_layer_move_create, NULL, NULL, NULL,
  67     (VikToolMouseFunc) georef_layer_move_press, NULL, (VikToolMouseFunc) georef_layer_move_release,
  68     (VikToolKeyFunc) NULL, GDK_CURSOR_IS_PIXMAP, &cursor_geomove_pixbuf },
  69
  70   { N_("Georef Zoom Tool"), (VikToolConstructorFunc) georef_layer_zoom_create, NULL, NULL, NULL,
  71     (VikToolMouseFunc) georef_layer_zoom_press, NULL, NULL,
  72     (VikToolKeyFunc) NULL, GDK_CURSOR_IS_PIXMAP, &cursor_geozoom_pixbuf },
  73 };
  74
  75 VikLayerInterface vik_georef_layer_interface = {
  76   "GeoRef Map",
  77   &vikgeoreflayer_pixbuf, /*icon */
  78
  79   georef_tools,
  80   sizeof(georef_tools) / sizeof(VikToolInterface),
  81
  82   georef_layer_params,
  83   NUM_PARAMS,
  84   NULL,
  85   0,
  86
  87   VIK_MENU_ITEM_ALL,
  88
  89   (VikLayerFuncCreate)                  georef_layer_create,
  90   (VikLayerFuncRealize)                 NULL,
  91   (VikLayerFuncPostRead)                georef_layer_load_image,
  92   (VikLayerFuncFree)                    georef_layer_free,
  93
  94   (VikLayerFuncProperties)              georef_layer_properties,
  95   (VikLayerFuncDraw)                    georef_layer_draw,
  96   (VikLayerFuncChangeCoordMode)         NULL,
  97
  98   (VikLayerFuncSetMenuItemsSelection)   NULL,
  99   (VikLayerFuncGetMenuItemsSelection)   NULL,
 100
 101   (VikLayerFuncAddMenuItems)            georef_layer_add_menu_items,
 102   (VikLayerFuncSublayerAddMenuItems)    NULL,
 103
 104   (VikLayerFuncSublayerRenameRequest)   NULL,
 105   (VikLayerFuncSublayerToggleVisible)   NULL,
 106
 107   (VikLayerFuncMarshall)                georef_layer_marshall,
 108   (VikLayerFuncUnmarshall)              georef_layer_unmarshall,
 109
 110   (VikLayerFuncSetParam)                georef_layer_set_param,
 111   (VikLayerFuncGetParam)                georef_layer_get_param,
 112
 113   (VikLayerFuncReadFileData)            NULL,
 114   (VikLayerFuncWriteFileData)           NULL,
 115
 116   (VikLayerFuncDeleteItem)              NULL,
 117   (VikLayerFuncCopyItem)                NULL,
 118   (VikLayerFuncPasteItem)               NULL,
 119   (VikLayerFuncFreeCopiedItem)          NULL,
 120   (VikLayerFuncDragDropRequest)         NULL,
 121 };
 122
 123 struct _VikGeorefLayer {
 124   VikLayer vl;
 125   gchar *image;
 126   GdkPixbuf *pixbuf;
 127   struct UTM corner;
 128   gdouble mpp_easting, mpp_northing;
 129   guint width, height;
 130
 131   gint click_x, click_y;
 132 };
 133
 134
 135
 136 GType vik_georef_layer_get_type ()
 137 {
 138   static GType vgl_type = 0;
 139
 140   if (!vgl_type)
 141   {
 142     static const GTypeInfo vgl_info =
 143     {
 144       sizeof (VikGeorefLayerClass),
 145       NULL, /* base_init */
 146       NULL, /* base_finalize */
 147       NULL, /* class init */
 148       NULL, /* class_finalize */
 149       NULL, /* class_data */
 150       sizeof (VikGeorefLayer),
 151       0,
 152       NULL /* instance init */
 153     };
 154     vgl_type = g_type_register_static ( VIK_LAYER_TYPE, "VikGeorefLayer", &vgl_info, 0 );
 155   }
 156
 157   return vgl_type;
 158 }
 159
 160 static void georef_layer_marshall( VikGeorefLayer *vgl, guint8 **data, gint *len )
 161 {
 162   vik_layer_marshall_params ( VIK_LAYER(vgl), data, len );
 163 }
 164
 165 static VikGeorefLayer *georef_layer_unmarshall( guint8 *data, gint len, VikViewport *vvp )
 166 {
 167   VikGeorefLayer *rv = georef_layer_new ( vvp );
 168   vik_layer_unmarshall_params ( VIK_LAYER(rv), data, len, vvp );
 169   if (rv->image) {
 170     georef_layer_load_image ( rv );
 171   }
 172   return rv;
 173 }
 174
 175 static gboolean georef_layer_set_param ( VikGeorefLayer *vgl, guint16 id, VikLayerParamData data, VikViewport *vp )
 176 {
 177   switch ( id )
 178   {
 179     case PARAM_IMAGE: georef_layer_set_image ( vgl, data.s ); break;
 180     case PARAM_CN: vgl->corner.northing = data.d; break;
 181     case PARAM_CE: vgl->corner.easting = data.d; break;
 182     case PARAM_MN: vgl->mpp_northing = data.d; break;
 183     case PARAM_ME:  vgl->mpp_easting = data.d; break;
 184   }
 185   return TRUE;
 186 }
 187
 188 static VikLayerParamData georef_layer_get_param ( VikGeorefLayer *vgl, guint16 id )
 189 {
 190   VikLayerParamData rv;
 191   switch ( id )
 192   {
 193     case PARAM_IMAGE: rv.s = vgl->image ? vgl->image : ""; break;
 194     case PARAM_CN: rv.d = vgl->corner.northing; break;
 195     case PARAM_CE: rv.d = vgl->corner.easting; break;
 196     case PARAM_MN: rv.d = vgl->mpp_northing; break;
 197     case PARAM_ME: rv.d = vgl->mpp_easting; break;
 198   }
 199   return rv;
 200 }
 201
 202 VikGeorefLayer *georef_layer_new ( )
 203 {
 204   VikGeorefLayer *vgl = VIK_GEOREF_LAYER ( g_object_new ( VIK_GEOREF_LAYER_TYPE, NULL ) );
 205   vik_layer_init ( VIK_LAYER(vgl), VIK_LAYER_GEOREF );
 206
 207   vgl->image = NULL;
 208   vgl->pixbuf = NULL;
 209   vgl->click_x = -1;
 210   vgl->click_y = -1;
 211   return vgl;
 212 }
 213
 214 static void georef_layer_draw ( VikGeorefLayer *vgl, gpointer data )
 215 {
 216 /* bla, bla */
 217   if ( vgl->pixbuf )
 218   {
 219     VikViewport *vp = VIK_VIEWPORT(data);
 220     struct UTM utm_middle;
 221     gdouble xmpp = vik_viewport_get_xmpp(vp), ympp = vik_viewport_get_ympp(vp);
 222     vik_coord_to_utm ( vik_viewport_get_center ( vp ), &utm_middle );
 223
 224     if ( xmpp == vgl->mpp_easting && ympp == vgl->mpp_northing )
 225     {
 226       guint width = vik_viewport_get_width(vp), height = vik_viewport_get_height(vp);
 227       gint32 x, y;
 228       vgl->corner.zone = utm_middle.zone;
 229       vgl->corner.letter = utm_middle.letter;
 230       VikCoord corner_coord;
 231       vik_coord_load_from_utm ( &corner_coord, vik_viewport_get_coord_mode(vp), &(vgl->corner) );
 232       vik_viewport_coord_to_screen ( vp, &corner_coord, &x, &y );
 233       if ( (x < 0 || x < width) && (y < 0 || y < height) && x+vgl->width > 0 && y+vgl->height > 0 )
 234         vik_viewport_draw_pixbuf ( vp, vgl->pixbuf, 0, 0, x, y, vgl->width, vgl->height ); /* todo: draw only what we need to. */
 235     }
 236   }
 237 }
 238
 239 static void georef_layer_free ( VikGeorefLayer *vgl )
 240 {
 241   if ( vgl->image != NULL )
 242     g_free ( vgl->image );
 243 }
 244
 245 VikGeorefLayer *georef_layer_create ( VikViewport *vp )
 246 {
 247   return georef_layer_new ();
 248 }
 249
 250 gboolean georef_layer_properties ( VikGeorefLayer *vgl, gpointer vp )
 251 {
 252   return georef_layer_dialog ( &vgl, vp, VIK_GTK_WINDOW_FROM_WIDGET(vp) );
 253 }
 254
 255 static void georef_layer_load_image ( VikGeorefLayer *vgl )
 256 {
 257   GError *gx = NULL;
 258   if ( vgl->image == NULL )
 259     return;
 260
 261   if ( vgl->pixbuf )
 262     g_object_unref ( G_OBJECT(vgl->pixbuf) );
 263
 264   vgl->pixbuf = gdk_pixbuf_new_from_file ( vgl->image, &gx );
 265
 266   if (gx)
 267   {
 268     g_warning ( _("Couldn't open image file: %s"), gx->message );
 269     g_error_free ( gx );
 270   }
 271   else
 272   {
 273     vgl->width = gdk_pixbuf_get_width ( vgl->pixbuf );
 274     vgl->height = gdk_pixbuf_get_height ( vgl->pixbuf );
 275   }
 276
 277   /* should find length and width here too */
 278 }
 279
 280 static void georef_layer_set_image ( VikGeorefLayer *vgl, const gchar *image )
 281 {
 282   if ( vgl->image )
 283     g_free ( vgl->image );
 284   if ( image == NULL )
 285     vgl->image = NULL;
 286   vgl->image = g_strdup ( image );
 287 }
 288
 289 static gboolean world_file_read_line ( gchar *buffer, gint size, FILE *f, GtkWidget *widget, gboolean use_value )
 290 {
 291   if (!fgets ( buffer, 1024, f ))
 292   {
 293     a_dialog_error_msg ( VIK_GTK_WINDOW_FROM_WIDGET(widget), _("Unexpected end of file reading World file.") );
 294     g_free ( buffer );
 295     fclose ( f );
 296     f = NULL;
 297     return FALSE;
 298   }
 299   if ( use_value )
 300   {
 301     gdouble val = g_strtod ( buffer, NULL );
 302     gtk_spin_button_set_value ( GTK_SPIN_BUTTON(widget), val > 0 ? val : -val );
 303   }
 304   return TRUE;
 305 }
 306
 307 static void georef_layer_dialog_load ( GtkWidget *pass_along[4] )
 308 {
 309   GtkWidget *file_selector = gtk_file_chooser_dialog_new (_("Choose World file"),
 310                                       NULL,
 311                                       GTK_FILE_CHOOSER_ACTION_OPEN,
 312                                       GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,
 313                                       GTK_STOCK_OPEN, GTK_RESPONSE_ACCEPT,
 314                                       NULL);
 315
 316   if ( gtk_dialog_run ( GTK_DIALOG ( file_selector ) ) == GTK_RESPONSE_ACCEPT )
 317   {
 318     FILE *f = g_fopen ( gtk_file_chooser_get_filename ( GTK_FILE_CHOOSER(file_selector) ), "r" );
 319     gtk_widget_destroy ( file_selector );
 320     if ( !f )
 321     {
 322       a_dialog_error_msg ( VIK_GTK_WINDOW_FROM_WIDGET(pass_along[0]), _("The World file you requested could not be opened for reading.") );
 323       return;
 324     }
 325     else
 326     {
 327       gchar *buffer = g_malloc ( 1024 * sizeof(gchar) );
 328       if ( world_file_read_line ( buffer, 1024, f, pass_along[0], TRUE ) && world_file_read_line ( buffer, 1024, f, pass_along[1], TRUE )
 329         && world_file_read_line ( buffer, 1024, f, pass_along[0], FALSE ) && world_file_read_line ( buffer, 1024, f, pass_along[0], FALSE )
 330         && world_file_read_line ( buffer, 1024, f, pass_along[2], TRUE ) && world_file_read_line ( buffer, 1024, f, pass_along[3], TRUE ) )
 331       {
 332         g_free ( buffer );
 333         fclose ( f );
 334         f = NULL;
 335       }
 336     }
 337   }
 338   else
 339     gtk_widget_destroy ( file_selector );
 340 /* do your jazz
 341 We need a
 342   file selection dialog
 343   file opener for reading, if NULL, send error_msg ( VIK_GTK_WINDOW_FROM_WIDGET(pass_along[0]) )
 344   does that catch directories too?
 345   read lines -- if not enough lines, give error.
 346   if anything outside, give error. define range with #define CONSTANTS
 347   put 'em in thar widgets, and that's it.
 348 */
 349 }
 350
 351 static void georef_layer_export_params ( gpointer *pass_along[2] )
 352 {
 353   VikGeorefLayer *vgl = VIK_GEOREF_LAYER(pass_along[0]);
 354   GtkWidget *file_selector = gtk_file_chooser_dialog_new (_("Choose World file"),
 355                                       NULL,
 356                                       GTK_FILE_CHOOSER_ACTION_SAVE,
 357                                       GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,
 358                                       GTK_STOCK_OPEN, GTK_RESPONSE_ACCEPT,
 359                                       NULL);
 360   if ( gtk_dialog_run ( GTK_DIALOG ( file_selector ) ) == GTK_RESPONSE_ACCEPT )
 361   {
 362     FILE *f = g_fopen ( gtk_file_chooser_get_filename ( GTK_FILE_CHOOSER(file_selector) ), "w" );
 363
 364     gtk_widget_destroy ( file_selector );
 365     if ( !f )
 366     {
 367       a_dialog_error_msg ( VIK_GTK_WINDOW_FROM_WIDGET(pass_along[0]), _("The file you requested could not be opened for writing.") );
 368       return;
 369     }
 370     else
 371     {
 372       fprintf ( f, "%f\n%f\n%f\n%f\n%f\n%f\n", vgl->mpp_easting, vgl->mpp_northing, 0.0, 0.0, vgl->corner.easting, vgl->corner.northing );
 373       fclose ( f );
 374       f = NULL;
 375     }
 376   }
 377   else
 378    gtk_widget_destroy ( file_selector );
 379 }
 380
 381 /* returns TRUE if OK was pressed. */
 382 static gboolean georef_layer_dialog ( VikGeorefLayer **vgl, gpointer vp, GtkWindow *w )
 383 {
 384   GtkWidget *dialog = gtk_dialog_new_with_buttons (_("Layer Properties"),
 385                                                   w,
 386                                                   GTK_DIALOG_MODAL | GTK_DIALOG_DESTROY_WITH_PARENT,
 387                                                   GTK_STOCK_CANCEL,
 388                                                   GTK_RESPONSE_REJECT,
 389                                                   GTK_STOCK_OK,
 390                                                   GTK_RESPONSE_ACCEPT,
 391                                                   NULL );
 392   GtkWidget *table, *wfp_hbox, *wfp_label, *wfp_button, *ce_label, *ce_spin, *cn_label, *cn_spin, *xlabel, *xspin, *ylabel, *yspin, *imagelabel, *imageentry;
 393
 394   GtkWidget *pass_along[4];
 395
 396   table = gtk_table_new ( 6, 2, FALSE );
 397   gtk_box_pack_start ( GTK_BOX(GTK_DIALOG(dialog)->vbox), table, TRUE, TRUE, 0 );
 398
 399   wfp_hbox = gtk_hbox_new ( FALSE, 0 );
 400   wfp_label = gtk_label_new ( _("World File Parameters:") );
 401   wfp_button = gtk_button_new_with_label ( _("Load From File...") );
 402
 403   gtk_box_pack_start ( GTK_BOX(wfp_hbox), wfp_label, TRUE, TRUE, 0 );
 404   gtk_box_pack_start ( GTK_BOX(wfp_hbox), wfp_button, FALSE, FALSE, 3 );
 405
 406   ce_label = gtk_label_new ( _("Corner pixel easting:") );
 407   ce_spin = gtk_spin_button_new ( (GtkAdjustment *) gtk_adjustment_new ( 4, 0.0, 1500000.0, 1, 5, 5 ), 1, 4 );
 408
 409   cn_label = gtk_label_new ( _("Corner pixel northing:") );
 410   cn_spin = gtk_spin_button_new ( (GtkAdjustment *) gtk_adjustment_new ( 4, 0.0, 9000000.0, 1, 5, 5 ), 1, 4 );
 411
 412   xlabel = gtk_label_new ( _("X (easting) scale (mpp): "));
 413   ylabel = gtk_label_new ( _("Y (northing) scale (mpp): "));
 414
 415   xspin = gtk_spin_button_new ( (GtkAdjustment *) gtk_adjustment_new ( 4, VIK_VIEWPORT_MIN_ZOOM, VIK_VIEWPORT_MAX_ZOOM, 1, 5, 5 ), 1, 8 );
 416   yspin = gtk_spin_button_new ( (GtkAdjustment *) gtk_adjustment_new ( 4, VIK_VIEWPORT_MIN_ZOOM, VIK_VIEWPORT_MAX_ZOOM, 1, 5, 5 ), 1, 8 );
 417
 418   imagelabel = gtk_label_new ( _("Map Image:") );
 419   imageentry = vik_file_entry_new ();
 420
 421   if (*vgl)
 422   {
 423     gtk_spin_button_set_value ( GTK_SPIN_BUTTON(ce_spin), (*vgl)->corner.easting );
 424     gtk_spin_button_set_value ( GTK_SPIN_BUTTON(cn_spin), (*vgl)->corner.northing );
 425     gtk_spin_button_set_value ( GTK_SPIN_BUTTON(xspin), (*vgl)->mpp_easting );
 426     gtk_spin_button_set_value ( GTK_SPIN_BUTTON(yspin), (*vgl)->mpp_northing );
 427     if ( (*vgl)->image )
 428     vik_file_entry_set_filename ( VIK_FILE_ENTRY(imageentry), (*vgl)->image );
 429   }
 430   else
 431   {
 432     VikCoord corner_coord;
 433     struct UTM utm;
 434     vik_viewport_screen_to_coord ( VIK_VIEWPORT(vp), 0, 0, &corner_coord );
 435     vik_coord_to_utm ( &corner_coord, &utm );
 436     gtk_spin_button_set_value ( GTK_SPIN_BUTTON(ce_spin), utm.easting );
 437     gtk_spin_button_set_value ( GTK_SPIN_BUTTON(cn_spin), utm.northing );
 438     gtk_spin_button_set_value ( GTK_SPIN_BUTTON(xspin), vik_viewport_get_xmpp ( VIK_VIEWPORT(vp) ) );
 439     gtk_spin_button_set_value ( GTK_SPIN_BUTTON(yspin), vik_viewport_get_ympp ( VIK_VIEWPORT(vp) ) );
 440   }
 441
 442   gtk_table_attach_defaults ( GTK_TABLE(table), imagelabel, 0, 1, 0, 1 );
 443   gtk_table_attach_defaults ( GTK_TABLE(table), imageentry, 1, 2, 0, 1 );
 444   gtk_table_attach_defaults ( GTK_TABLE(table), wfp_hbox, 0, 2, 1, 2 );
 445   gtk_table_attach_defaults ( GTK_TABLE(table), xlabel, 0, 1, 2, 3 );
 446   gtk_table_attach_defaults ( GTK_TABLE(table), xspin, 1, 2, 2, 3 );
 447   gtk_table_attach_defaults ( GTK_TABLE(table), ylabel, 0, 1, 3, 4 );
 448   gtk_table_attach_defaults ( GTK_TABLE(table), yspin, 1, 2, 3, 4 );
 449   gtk_table_attach_defaults ( GTK_TABLE(table), ce_label, 0, 1, 4, 5 );
 450   gtk_table_attach_defaults ( GTK_TABLE(table), ce_spin, 1, 2, 4, 5 );
 451   gtk_table_attach_defaults ( GTK_TABLE(table), cn_label, 0, 1, 5, 6 );
 452   gtk_table_attach_defaults ( GTK_TABLE(table), cn_spin, 1, 2, 5, 6 );
 453
 454   pass_along[0] = xspin;
 455   pass_along[1] = yspin;
 456   pass_along[2] = ce_spin;
 457   pass_along[3] = cn_spin;
 458   g_signal_connect_swapped ( G_OBJECT(wfp_button), "clicked", G_CALLBACK(georef_layer_dialog_load), pass_along );
 459
 460   gtk_widget_show_all ( table );
 461
 462   if ( gtk_dialog_run ( GTK_DIALOG(dialog) ) == GTK_RESPONSE_ACCEPT )
 463   {
 464     if (! *vgl)
 465     {
 466       *vgl = georef_layer_new ();
 467        vik_layer_rename ( VIK_LAYER(*vgl), vik_georef_layer_interface.name );
 468     }
 469     (*vgl)->corner.easting = gtk_spin_button_get_value ( GTK_SPIN_BUTTON(ce_spin) );
 470     (*vgl)->corner.northing = gtk_spin_button_get_value ( GTK_SPIN_BUTTON(cn_spin) );
 471     (*vgl)->mpp_easting = gtk_spin_button_get_value ( GTK_SPIN_BUTTON(xspin) );
 472     (*vgl)->mpp_northing = gtk_spin_button_get_value ( GTK_SPIN_BUTTON(yspin) );
 473     if ( (!(*vgl)->image) || strcmp( (*vgl)->image, vik_file_entry_get_filename(VIK_FILE_ENTRY(imageentry)) ) != 0 )
 474     {
 475       georef_layer_set_image ( *vgl, vik_file_entry_get_filename(VIK_FILE_ENTRY(imageentry)) );
 476       georef_layer_load_image ( *vgl );
 477     }
 478
 479     gtk_widget_destroy ( GTK_WIDGET(dialog) );
 480     return TRUE;
 481   }
 482   gtk_widget_destroy ( GTK_WIDGET(dialog) );
 483   return FALSE;
 484 }
 485
 486 static void georef_layer_zoom_to_fit ( gpointer vgl_vlp[2] )
 487 {
 488   vik_viewport_set_xmpp ( vik_layers_panel_get_viewport(VIK_LAYERS_PANEL(vgl_vlp[1])), VIK_GEOREF_LAYER(vgl_vlp[0])->mpp_easting );
 489   vik_viewport_set_ympp ( vik_layers_panel_get_viewport(VIK_LAYERS_PANEL(vgl_vlp[1])), VIK_GEOREF_LAYER(vgl_vlp[0])->mpp_northing );
 490   vik_layers_panel_emit_update ( VIK_LAYERS_PANEL(vgl_vlp[1]) );
 491 }
 492
 493 static void georef_layer_goto_center ( gpointer vgl_vlp[2] )
 494 {
 495   VikGeorefLayer *vgl = VIK_GEOREF_LAYER ( vgl_vlp[0] );
 496   VikViewport *vp = vik_layers_panel_get_viewport(VIK_LAYERS_PANEL(vgl_vlp[1]));
 497   struct UTM utm;
 498   VikCoord coord;
 499
 500   vik_coord_to_utm ( vik_viewport_get_center ( vp ), &utm );
 501
 502   utm.easting = vgl->corner.easting + (vgl->width * vgl->mpp_easting / 2); /* only an approximation */
 503   utm.northing = vgl->corner.northing - (vgl->height * vgl->mpp_northing / 2);
 504
 505   vik_coord_load_from_utm ( &coord, vik_viewport_get_coord_mode ( vp ), &utm );
 506   vik_viewport_set_center_coord ( vp, &coord );
 507
 508   vik_layers_panel_emit_update ( VIK_LAYERS_PANEL(vgl_vlp[1]) );
 509 }
 510
 511 static void georef_layer_add_menu_items ( VikGeorefLayer *vgl, GtkMenu *menu, gpointer vlp )
 512 {
 513   static gpointer pass_along[2];
 514   GtkWidget *item;
 515   pass_along[0] = vgl;
 516   pass_along[1] = vlp;
 517
 518   item = gtk_menu_item_new();
 519   gtk_menu_shell_append ( GTK_MENU_SHELL(menu), item );
 520   gtk_widget_show ( item );
 521
 522   item = gtk_menu_item_new_with_label ( _("Zoom to Fit Map") );
 523   g_signal_connect_swapped ( G_OBJECT(item), "activate", G_CALLBACK(georef_layer_zoom_to_fit), pass_along );
 524   gtk_menu_shell_append (GTK_MENU_SHELL (menu), item);
 525   gtk_widget_show ( item );
 526
 527   item = gtk_menu_item_new_with_label ( _("Goto Map Center") );
 528   g_signal_connect_swapped ( G_OBJECT(item), "activate", G_CALLBACK(georef_layer_goto_center), pass_along );
 529   gtk_menu_shell_append (GTK_MENU_SHELL (menu), item);
 530   gtk_widget_show ( item );
 531
 532   item = gtk_menu_item_new_with_label ( _("Export to World File") );
 533   g_signal_connect_swapped ( G_OBJECT(item), "activate", G_CALLBACK(georef_layer_export_params), pass_along );
 534   gtk_menu_shell_append (GTK_MENU_SHELL (menu), item);
 535   gtk_widget_show ( item );
 536 }
 537
 538
 539 static gpointer georef_layer_move_create ( VikWindow *vw, VikViewport *vvp)
 540 {
 541   return vvp;
 542 }
 543
 544 static gboolean georef_layer_move_release ( VikGeorefLayer *vgl, GdkEventButton *event, VikViewport *vvp )
 545 {
 546   if (!vgl || vgl->vl.type != VIK_LAYER_GEOREF)
 547     return FALSE;
 548
 549   if ( vgl->click_x != -1 )
 550   {
 551     vgl->corner.easting += (event->x - vgl->click_x) * vik_viewport_get_xmpp (vvp);
 552     vgl->corner.northing -= (event->y - vgl->click_y) * vik_viewport_get_ympp (vvp);
 553     vik_layer_emit_update ( VIK_LAYER(vgl) );
 554     return TRUE;
 555   }
 556   return FALSE; /* I didn't move anything on this layer! */
 557 }
 558
 559 static gpointer georef_layer_zoom_create ( VikWindow *vw, VikViewport *vvp)
 560 {
 561   return vvp;
 562 }
 563
 564 static gboolean georef_layer_zoom_press ( VikGeorefLayer *vgl, GdkEventButton *event, VikViewport *vvp )
 565 {
 566   if (!vgl || vgl->vl.type != VIK_LAYER_GEOREF)
 567     return FALSE;
 568   if ( event->button == 1 )
 569   {
 570     if ( vgl->mpp_easting < (VIK_VIEWPORT_MAX_ZOOM / 1.05) && vgl->mpp_northing < (VIK_VIEWPORT_MAX_ZOOM / 1.05) )
 571     {
 572       vgl->mpp_easting *= 1.01;
 573       vgl->mpp_northing *= 1.01;
 574     }
 575   }
 576   else
 577   {
 578     if ( vgl->mpp_easting > (VIK_VIEWPORT_MIN_ZOOM * 1.05) && vgl->mpp_northing > (VIK_VIEWPORT_MIN_ZOOM * 1.05) )
 579     {
 580       vgl->mpp_easting /= 1.01;
 581       vgl->mpp_northing /= 1.01;
 582     }
 583   }
 584   vik_viewport_set_xmpp ( vvp, vgl->mpp_easting );
 585   vik_viewport_set_ympp ( vvp, vgl->mpp_northing );
 586   vik_layer_emit_update ( VIK_LAYER(vgl) );
 587   return TRUE;
 588 }
 589
 590 static gboolean georef_layer_move_press ( VikGeorefLayer *vgl, GdkEventButton *event, VikViewport *vvp )
 591 {
 592   if (!vgl || vgl->vl.type != VIK_LAYER_GEOREF)
 593     return FALSE;
 594   vgl->click_x = event->x;
 595   vgl->click_y = event->y;
 596   return TRUE;
 597 }