I have encountered a small problem when zooming. It seems that when you double click to drop a point it is not exactly where the mouse pointer is, it is off slightly. when you zoom in it gets worse. When you zoom closer it drops the point far to the right and vise versa when you zoom out. maybe someone can see why that is?
#Draggability of window
my $adj = Gtk2::Adjustment->new (1.00, 0.05, 5.00, 0.05, 0.50, 0.50);
my $dragger = Gtk2::Ex::Dragger->new( widget => $scwin,
    hadjustment => $scwin->get_hadjustment,
    vadjustment => $scwin->get_vadjustment,
    #update_policy => 'continous',
    #cursor => 'hand1'
    );

#Setup zooming
my $zoom = Gtk2::Label->new ("Zoom:");
$table->attach_defaults($zoom, 0, 1, 1, 2);
$adj->signal_connect (value_changed => \&zoom_changed, $canvas);
$zoom = Gtk2::SpinButton->new ($adj, 0.0, 2);
$zoom->set_size_request (50, -1);
$table->attach_defaults($zoom, 1, 2, 1, 2);

#handle the events
$canvas->signal_connect (event => \&event_handler);

$window->show_all;

Gtk2->main;
#------------------------------------------------
sub event_handler {
    my ( $widget, $event ) = @_;
    # print $widget ,' ',$event->type,"\n";
    
    #on 2 mouse presses, place waypoint 
    if ( $event->type eq "2button-press" ) {
        print 'x->',$event->x,'  ','y->',$event->y;
        
        #convert UTM to Lat and Long
        my $easting = $ps[0] * $event->x + 0.0 * $event->y + $mtp[3];
        my $northing = (-$ps[1]) * $event->y + 0.0 * $event->x + $mtp[
+4];
        my ($latitude,$longitude)=utm_to_latlon($ellipsoid,$zone,$east
+ing,$northing);
        print " ($latitude, $longitude)\n";
        
        #Drop icon
        my $tgroup = Gnome2::Canvas::Item->new ($root, 'Gnome2::Canvas
+::Group', x => $event->x, y => $event->y);
        Gnome2::Canvas::Item->new($tgroup, 'Gnome2::Canvas::Ellipse',
            x1 => 0,
            y1 => 0,
            x2 => 10,
            y2 => 10,
            fill_color => 'purple',
            outline_color => 'black');
            $tgroup->raise_to_top();
    }
    
    #on mouse press, pan the window
    if ( $event->type eq "button-press" ) {
        $dragger->start ($event);
    }
}
#------------------------------------------------
sub zoom_changed {
    my ($adj, $canvas) = @_;
    $canvas->set_pixels_per_unit ($adj->value);
}

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UPDATE: I am receiving this error: 
Gdk-CRITICAL **: gdk_property_change: assertion `type != GDK_TARGET_ST
+RING' fail
ed at C:/camelbox/site/lib/Gtk2/Ex/SyncCall.pm line 62.

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In reply to Re^4: geoTiff Application Building by deadpickle
in thread geoTiff Application Building by deadpickle

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