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