var mapClass = {

    new : func (device) {

        var m = { parents : [ mapClass ] };

        m.device = device;

        m.device.data.mapview = [

            m.device.display.display.get('view[0]'),

            m.device.display.display.get('view[1]')

        ];

        m.device.data.mapsize = [

            m.device.display.display.get('size[0]'),

            m.device.display.display.get('size[1]')

        ];

        m.device.data.zoom = 10;

        m.device.data.orientation = {

            text: 'NORTH UP',

            map: 0,

            airplane: data.hdg,

        };

        m.changeZoom();

        m.visibility = m.device.role == 'MFD';

        m.group = m.device.display.display.createGroup()

            .set('clip',

                    'rect('

                        ~ m.device.data.mapclip.top ~','

                        ~ m.device.data.mapclip.right ~','

                        ~ m.device.data.mapclip.bottom ~','

                        ~ m.device.data.mapclip.left ~')')

            .setCenter(

                (m.device.data.mapclip.right + m.device.data.mapclip.left) / 2,

                (m.device.data.mapclip.bottom + m.device.data.mapclip.top) / 2);

        m.layers = {};

        m.layers.tiles = MapTiles.new(m.device, m.group);

        m.layers.route = MapRoute.new(m.device, m.group);

        m.layers.navaids = MapNavaids.new(m.device, m.group);

#        m.device.display.display.createGroup().createChild('path')

#            .setColor(1,0,0)

#            .setColorFill(1,0,0)

#            .setStrokeLineWidth(2)

#            .moveTo(

#                m.device.data.mapclip.left + (m.device.data.mapclip.right-m.device.data.mapclip.left)/2,

#                m.device.data.mapclip.top +50)

#            .vertTo(

#                m.device.data.mapclip.bottom -50)

#            .close()

#            .moveTo(

#                m.device.data.mapclip.left +50,

#                m.device.data.mapclip.top + (m.device.data.mapclip.bottom-m.device.data.mapclip.top)/2)

#            .horizTo(

#                m.device.data.mapclip.right-50)

#            .close();

        return m;

    },

    changeZoom : func (d = 0) {

        me.device.data.zoom = math.max(2, math.min(19, me.device.data.zoom + d));

        me.device.data['range-nm'] = me.device.display.display.get('view[1]') / 2 * 84.53 * math.cos(data.lat) / math.pow(2, me.device.data.zoom);

        me.device.data['range-factor'] = math.pow(2,13 - me.device.data.zoom) * 1.6875;

    },

    update : func {

        if (me.device.data.orientation.text == 'NORTH UP') {

            me.device.data.orientation.map = 0;

            me.device.data.orientation.airplane = data.hdg;

        }

        elsif (me.device.data.orientation.text == 'TRK UP') {

            if (data.wow) {

                me.device.data.orientation.map = -data.hdg;

                me.device.data.orientation.airplane = data.hdg;

            }

            else {

                var track = getprop('/orientation/track-deg');

                me.device.data.orientation.map = -track;

                me.device.data.orientation.airplane = data.hdg;

            }

        }

        elsif (me.device.data.orientation.text == 'DTK UP') {

            var desired = getprop('/instrumentation/gps/wp/wp[1]/desired-course-deg');

            me.device.data.orientation.map = -desired;

            me.device.data.orientation.airplane = data.hdg;

        }

        elsif (me.device.data.orientation.text == 'HDG UP') {

            me.device.data.orientation.map = -data.hdg;

            me.device.data.orientation.airplane = data.hdg;

        }

        me.group.setRotation(me.device.data.orientation.map * D2R);

        foreach (var l; keys(me.layers))

            me.layers[l].update();

    },

    setVisible : func (v) {

        me.visibility = v;

        foreach (var l; keys(me.layers))

            me.layers[l].setVisible(v);

    },

};