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