/**
* http://en.wikipedia.org/wiki/World_file
*
* Note world files do not define the units and nor are the units standardized :(
* Currently Viking only supports:
* x&y scale as meters per pixel
* x&y coords as UTM eastings and northings respectively
*/
static gint world_file_read_file ( const gchar* filename, gdouble values[4] )
{
g_debug ("%s - trying world file %s", __FUNCTION__, filename);
FILE *f = g_fopen ( filename, "r" );
if ( !f )
return 1;
else {
gint answer = 2; // Not enough info read yet
// **We do not handle 'skew' values ATM - normally they are a value of 0 anyway to align with the UTM grid
if ( world_file_read_line ( f, &values[0], TRUE ) // x scale
&& world_file_read_line ( f, NULL, FALSE ) // Ignore value in y-skew line**
&& world_file_read_line ( f, NULL, FALSE ) // Ignore value in x-skew line**
&& world_file_read_line ( f, &values[1], TRUE ) // y scale
&& world_file_read_line ( f, &values[2], TRUE ) // x-coordinate of the upper left pixel
&& world_file_read_line ( f, &values[3], TRUE ) // y-coordinate of the upper left pixel
)
{
// Success
g_debug ("%s - %s - world file read success", __FUNCTION__, filename);
answer = 0;
}
fclose ( f );
return answer;
}
}
static void georef_layer_dialog_load ( GtkWidget *pass_along[4] )
{
GtkWidget *file_selector = gtk_file_chooser_dialog_new (_("Choose World file"),
NULL,
GTK_FILE_CHOOSER_ACTION_OPEN,
GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,
GTK_STOCK_OPEN, GTK_RESPONSE_ACCEPT,
NULL);
if ( gtk_dialog_run ( GTK_DIALOG ( file_selector ) ) == GTK_RESPONSE_ACCEPT )
{
FILE *f = g_fopen ( gtk_file_chooser_get_filename ( GTK_FILE_CHOOSER(file_selector) ), "r" );
gtk_widget_destroy ( file_selector );
if ( !f )
{
a_dialog_error_msg ( VIK_GTK_WINDOW_FROM_WIDGET(pass_along[0]), _("The World file you requested could not be opened for reading.") );
return;
}
else
{
gchar *buffer = g_malloc ( 1024 * sizeof(gchar) );
if ( world_file_read_line ( buffer, 1024, f, pass_along[0], TRUE ) && world_file_read_line ( buffer, 1024, f, pass_along[0], FALSE)
&& world_file_read_line ( buffer, 1024, f, pass_along[0], FALSE ) && world_file_read_line ( buffer, 1024, f, pass_along[1], TRUE)
&& world_file_read_line ( buffer, 1024, f, pass_along[2], TRUE ) && world_file_read_line ( buffer, 1024, f, pass_along[3], TRUE ) )
{
g_free ( buffer );
fclose ( f );
f = NULL;
}
}
}
else
gtk_widget_destroy ( file_selector );
/* do your jazz
We need a
file selection dialog
file opener for reading, if NULL, send error_msg ( VIK_GTK_WINDOW_FROM_WIDGET(pass_along[0]) )
does that catch directories too?
read lines -- if not enough lines, give error.
if anything outside, give error. define range with #define CONSTANTS
put 'em in thar widgets, and that's it.
*/
}
