# vim: set foldmethod=marker foldmarker={{{,}}} :

var displayClass = {

    new: func(device) {

# the contructor {{{

        var m = { parents: [ displayClass ] };

        m.display = canvas.new({

                "name"      : device.name,

                "size"      : device.data['screen-size'] != nil ? split(',', device.data['screen-size']) : [1024, 768],

                "view"      : device.data['screen-view'] != nil ? split(',', device.data['screen-view']) : [1024, 768],

                "mipmapping": 1

        });

        m.display.addPlacement({

                "node": device.data['screen-object'] != nil ? device.data['screen-object'] : "Screen",

                "parent": device.name

        });

        m.display.setColorBackground(0,0,0);

        m.role = device.role;

        m.device = device;

        m.screenElements = {};

        m.timers2 = {}; # tho old timer implementation use already a named timer hash

        # Softkeys revert to the previous level after 45 seconds of inactivity.

        m.softkeys_inactivity_delay = 45;

        if (device.role == 'MFD') {

            m.MFDMapTiles = MapTiles.new(m.display);

            m.MFDMapNavDisplay = MapNavDisplay.new(m.display);

            var eis_dir = data.zkv1000_dir ~ 'Nasal/EIS/';

            var eis_type = getprop('/instrumentation/zkv1000/eis/type');

            if (eis_type == nil or

                    (io.stat(eis_dir ~ eis_type ~ '.nas') == nil

                     and print(eis_type ~ ' not found')))

                eis_type = 'none';

            io.load_nasal(eis_dir ~ eis_type ~ '.nas', 'zkv1000');

            io.load_nasal(data.zkv1000_dir ~ 'Nasal/MFD.pages.nas', 'zkv1000');

        }

        return m;

    },

#}}}

# timers stuff {{{

    timers : {},

    timerTrigger : func {

        var now = systime();

        foreach (var id; keys(me.timers)) {

            if (me.timers[id] < now) {

                me.screenElements[id].hide();

                delete(me.timers, id);

            }

        }

        settimer(func me.timerTrigger(), 1);

    },

    addTimer : func (duration, element) {

        if (typeof(element) == 'scalar')

            element = [ element ];

        var end = systime() + duration;

        foreach (var e; element)

            me.timers[e] = end;

    },

#}}}

    loadsvg : func () {

        me.screen = me.display.createGroup();

        me.screen.hide();

        canvas.parsesvg(me.screen, data.zkv1000_reldir ~ 'Systems/screen.svg');

    },

    _showInitProgress : func (p,t) {

#{{{

        p.setText(t);

        if (zkv.getNode(me.device.name ~ '-init').getValue() != 0) {

            if (size(t) >= 10) t = '';

            settimer(func { me._showInitProgress(p, t ~ '.'); }, 0.1);

        }

        else {

            me.progress.hide();

            me.screen.show();

            var groups = {

                show : [

                    'Header',

                    'SoftKeysTexts', 

                    'COMM', 

                    'NAV', 

                    'nav-freq-switch',

                    'comm-freq-switch',

                ],

                text: [

                    'nav1-standby-freq', 'nav1-selected-freq', 'nav1-id',

                    'nav2-standby-freq', 'nav2-selected-freq', 'nav2-id',

                    'comm1-standby-freq', 'comm1-selected-freq',

                    'comm2-standby-freq', 'comm2-selected-freq',

                ],

                hide : [ ],

                clip: [ ],

            };

            for (var k = 0; k < 12; k += 1) {

                append(groups.text, sprintf("SoftKey%02i-text", k));

                append(groups.show, sprintf("SoftKey%02i-bg", k));

            }

            if (me.device.role == 'PFD') {

                append(groups.show,

                    'XPDR-TIME', 

                    'FlightInstruments',

                    'Horizon',

                    'bankPointer',

                    'VSI',

                    'Rose',

                    'Heading-bug',

                    'PFD-Widgets',

                    'Trends',

                    'Airspeed-Trend-Indicator',

                    'Altitude-Trend-Indicator',

                    'OAT',

                    'IAS-bg',

                    'TAS',

                    'GSPD',

                    'BARO-bg',

                    'SlipSkid',

                    'IAS-Vx', 'IAS-Vy', 'IAS-Vr', 'IAS-Vglide',

                );

                append(groups.hide,

                    'EIS',

                    'CDI',

                    'OMI', 'MarkerBG', 'MarkerText',

                    'NAV1-pointer', 'NAV1-CDI', 'NAV1-FROM', 'NAV1-TO',

                    'NAV2-pointer', 'NAV2-CDI', 'NAV2-FROM', 'NAV2-TO',

                    'GPS-pointer', 'GPS-CDI', 'GPS-CTI', 'GPS-CTI-diamond', 'GPS-FROM', 'GPS-TO',

                    'BRG1-pointer',

                    'BRG2-pointer',

                    'SelectedHDG-bg',

                    'SelectedHDG-bgtext',

                    'SelectedHDG-text',

                    'SelectedCRS-bg',

                    'SelectedCRS-bgtext',

                    'SelectedCRS-text',

                    'SelectedALT', 'SelectedALT-bug', 'SelectedALT-bg', 'SelectedALT-symbol',

                    'TAS',

                    'GSPD',

                    'WindData',

                    'Reversionnary',

                    'Annunciation',

                    'Comparator',

                    'BRG1',

                    'BRG2',

                    'DME1',

                    'PFD-Map',

                    'PFD-Multilines',

                    'WindData', 'WindData-OPTN1', 'WindData-OPTN2', 'WindData-OPTN1-HDG', 'WindData-OPTN2-symbol', 'WindData-OPTN2-headwind', 'WindData-OPTN2-crosswind', 'WindData-NODATA',

                    'AOA', 'AOA-needle', 'AOA-text', 'AOA-approach',

                );

                append(groups.clip,

                    'SpeedLint1',

                    'SpeedTape',

                    'LintAlt',

                    'AltLint00011'

                );

                append(groups.text,

                    'SelectedALT-text',

                    'TAS-text',

                    'GSPD-text',

                    'TIME-text',

                    'OAT-text',

                    'VSIText',

                    'Speed110',

                    'Alt11100',

                    'HDG-text',

                    'BARO-text',

                    'CDI-SRC-text', 'CDI-GPS-ANN-text', 'CDI-GPS-XTK-text',

                    'BRG1-pointer', 'BRG1-SRC-text', 'BRG1-DST-text', 'BRG1-WPID-text',

                    'BRG2-pointer', 'BRG2-SRC-text', 'BRG2-DST-text', 'BRG2-WPID-text',

                    'WindData-OPTN1-HDG-text', 'WindData-OPTN1-SPD-text',

                    'WindData-OPTN2-crosswind-text', 'WindData-OPTN2-headwind-text',

                    'XPDR-MODE-text', 'XPDR-DIGIT-3-text', 'XPDR-DIGIT-2-text', 'XPDR-DIGIT-1-text', 'XPDR-DIGIT-0-text',

                    'AltBigC', 'AltSmallC'

                );

                for (var place = 1; place <= 6; place +=1) {

                    append(groups.text,

                        'AltBigU' ~ place,

                        'AltSmallU' ~ place,

                        'AltBigD' ~ place,

                        'AltSmallD' ~ place

                    );

                }

                me.device.data.aoa = 0;

                me.device.data['aoa-auto'] = 0;

            }

            else {

                if (contains(me.parents[0], 'showEIS'))

                    me.showEIS(groups);

            }

            me.loadGroup(groups);

            if (me.device.role == 'PFD') {

                me.updateAI();

                me.updateVSI();

                me.updateIAS();

                me.updateALT();

                me.updateHSI();

                me.updateTIME();

                me.updateOAT();

                me.updateTAS();

                me.updateBRG();

                me.updateXPDR();

                me.updateBARO();

                me.updateOMI();

                me.timerTrigger();

            }

            else {

                me.updateEIS();

                me.MFDMapNavDisplay.showMap();

                me.MFDMapTiles.initialize_grid();

                me.MFDMapTiles.update_timer.start();

                me['page selected'] = 0;

                me.device.data['page selection'] = [

                    {

                        name: 'MAP',

                        objects: [

                            {text: 'NAVIGATION MAP'},

                            {text: 'TRAFFIC MAP'},

                            {text: 'STORMSCOPE'},

                            {text: 'WEATHER DATA LINK'},

                            {text: 'TAWS-B'},

                        ],

                    },

                    {

                        name: 'WPT',

                        objects: [

                            {text: 'AIRPORT INFORMATION'},

                            {text: 'AIRPORT DIRECTORY'},

                            {text: 'DEPARTURE INFORMATION'},

                            {text: 'ARRIVAL INFORMATION'},

                            {text: 'APPROACH INFORMATION'},

                            {text: 'WEATHER INFORMATION'},

                            {text: 'INTERSECTION INFORMATION'},

                            {text: 'NDB INFORMATION'},

                            {text: 'VOR INFORMATION'},

                            {text: 'USER WAYPOINT INFORMATION'},

                        ],

                    },

                    {

                        name: 'AUX',

                        objects: [

                            {text: 'TRIP PLANNING'},

                            {text: 'UTILITY'},

                            {text: 'GPS STATUS'},

                            {text: 'SYSTEM SETUP'},

                        ],

                    },

                    {

                        name: 'FPL',

                        objects: [

                            {text: 'ACTIVE FLIGHT PLAN'},

                            {text: 'WIDE VIEW, NARROW VIEW'},

                            {text: 'FLIGHT PLAN CATALOG'},

                        ],

                    },

                    {

                        name: 'PROC',

                        objects: [

                            {text: 'DEPARTURE LOADING'},

                            {text: 'ARRIVAL LOADING'},

                            {text: 'APPROACH LOADING'},

                        ],

                    },

                    {

                        name: 'NRST',

                        objects: [

                            {text: 'NEAREST AIRPORTS'},

                            {text: 'NEAREST INTERSECTIONS'},

                            {text: 'NEAREST NDB'},

                            {text: 'NEAREST VOR'},

                            {text: 'NEAREST USER WAYPOINTS'},

                            {text: 'NEAREST FREQUENCIES'},

                            {text: 'NEAREST AIRSPACES'},

                        ],

                    },

                ];

                me.setMFDPages();

            }

            me.updateNAV({auto:'nav', tune: radios.getNode('nav-tune').getValue()});

            me.updateCOMM({auto:'comm', tune: radios.getNode('comm-tune').getValue()});

            me.softkeys_inactivity();

            me.updateSoftKeys();

            me.progress.removeAllChildren();

            me.progress = nil;

            me.showInitProgress = nil;

            me._showInitProgress = nil;

            zkv.removeChild(me.device.role ~ 'init', 0);

        }

    },

#}}}

    showInitProgress : func (name) {

#{{{

        me.progress = me.display.createGroup();

        me.progress.show();

        me.progress.createChild("text", name ~ " title")

            .setTranslation(512, 384)

            .setAlignment("center-center")

            .setFont("LiberationFonts/LiberationSans-Italic.ttf")

            .setFontSize(64, 1)

            .setColor(1,1,1)

            .setText("ZKV1000 " ~ name ~ " init");

        zkv.getNode(name ~ '-init',1).setIntValue(1);

        me._showInitProgress(me.progress.createChild("text", name ~ "progress")

            .setTranslation(512, 484)

            .setAlignment("center-center")

            .setFont("LiberationFonts/LiberationSans-Bold.ttf")

            .setFontSize(128, 1)

            .setColor(1,0,0), '.');

    },

#}}}

    colors : {

# set of predefined colors {{{

        green : [0, 1, 0],

        white : [1, 1, 1],

        black : [0, 0, 0],

        lightblue : [0, 1, 1],

        darkblue : [0, 0, 1],

        red : [1, 0, 0],

        magenta : [1, 0, 1],

    },

#}}}

    loadGroup : func (h) {

#{{{

        if (typeof(h) != 'hash') {

            msg_dbg(sprintf("%s need a hash, but get a %s from %s",

                    caller(0)[0],

                    typeof(h),

                    caller(1)[0]));

            return;

        }

        var setMethod = func (e, t) {

            if (t == 'hide')

                me.screenElements[e].hide();

            elsif (t == 'show')

                me.screenElements[e].show();

            elsif (t == 'rot' or t == 'trans') {

                if (! contains(me.screenElements[e], t))

                    me.screenElements[e][t] = me.screenElements[e].createTransform();

            }

            elsif (t == 'clip') {

                if (contains(me.clips, e))

                    me.screenElements[e].set("clip", me.clips[e]);

                else

                    printlog('warn', 'no defined clip for ' ~ e);

            }

            elsif (t == 'text') {

                if (contains(me.texts, e)) {

                    if (contains(me.texts[e], 'alignment'))

                        me.screenElements[e].setAlignment(me.texts[e].alignment);

                    if (contains(me.texts[e], 'default'))

                        me.screenElements[e].setText(me.texts[e].default);

                    if (contains(me.texts[e], 'color'))

                        me.screenElements[e].setColor(me.texts[e].color);

                    if (contains(me.texts[e], 'visible'))

                        me.screenElements[e].setVisible(me.texts[e].visible);

                }

                else

                    printlog('debug', 'no text format for ' ~ e);

            }

            else

                printlog('warn', 'unknown method ' ~ t);

        };

        foreach (var todo; keys(h)) {

            if (typeof(h[todo]) != 'vector') h[todo] = [ h[todo] ];

            foreach (var id; h[todo]) {

                if (! contains(me.screenElements, id)) {

                    me.screenElements[id] = me.screen.getElementById(id);

                    if (me.screenElements[id] != nil)

                        setMethod(id, todo);

                    else

                        printlog('warn', 'SVG ID ' ~ id ~ ' not found');

                }

                else

                    setMethod(id, todo);

            }

        }

    },

#}}}

    clips : {

#{{{

        PitchScale   : "rect(70,664,370,256)",

        SpeedLint1   : "rect(252,226,318,204)",

        SpeedTape    : "rect(115,239,455,156)",

        LintAlt      : "rect(115,808,455,704)",

        AltLint00011 : "rect(252,804,318,771)",

    },

#}}}

    texts : {

#{{{

        VSIText : {

            alignment: "right-bottom", default : num('0'),

        },

        Speed110 : {

            alignment : 'left-bottom'

        },

        Alt11100 : {

            alignment:'left-bottom'

        },

        "HDG-text" : {

            default: '---°'

        },

        'nav1-standby-freq' : {

            color: [0, 1, 1],

        },

        'nav1-id' : {

            default: ''

        },

        'nav2-id' : {

            default: ''

        },

        'CDI-GPS-ANN-text' : {

            visible : 0

        },

        'CDI-GPS-XTK-text' : {

            visible : 0

        },

        'CDI-SRC-text' : {

            visible : 0

        },

        'BARO-text' : {

            alignment : 'left-bottom',

        }

#        'TAS-text' : {

#            alignment : 'right-bottom',

#        },

#        'GSPD-text' : {

#            alignment : 'right-bottom',

#        },

    },

#}}}

    softkeys_inactivity : func {

# automagically back to previous level after some delay {{{

        me.timers2.softkeys_inactivity = maketimer (

            me.softkeys_inactivity_delay,

            func {

                pop(me.device.softkeys.path);

                me.updateSoftKeys();

            }, me);

        me.timers2.softkeys_inactivity.singleShot = 1;

    },

#}}}

    setSoftKeyColor : func (n, active, alert = 0) {

# set colors for active softkeys {{{

        var sftk = sprintf('SoftKey%02i-', n);

        if (active) {

            var bg = alert ? 1 : 0.5;

            me.screenElements[sftk ~ 'bg']

                .setColorFill(bg,bg,bg);

            me.screenElements[sftk ~ 'text']

                .setColor(0,0,0);

        }

        else {

            me.screenElements[sftk ~ 'bg']

                .setColorFill(0,0,0);

            me.screenElements[sftk ~ 'text']

                .setColor(1,1,1);

        }

    },

#}}}

    updateSoftKeys : func {

# update SoftKeys boxes {{{

        # on PFD the last boxes are always BACK and ALERTS

        if (me.device.role == 'PFD') {

            me.screenElements[sprintf("SoftKey%02i-text", 11)]

                .setText('ALERTS');

            if (size(me.device.softkeys.path) != 0)

                me.screenElements[sprintf("SoftKey%02i-text", 10)]

                    .setText('BACK');

        }

        var path = keyMap[me.device.role];

        var pathid = '';

        foreach (var p; me.device.softkeys.path) {

            path = path[p];

            pathid ~= p;

        }

        # feeding with empty menus the first boxes

        var start = (contains(path, 'first')) ? path.first : 0;

        for (var k = 0; k < start; k+=1) {

            var sftk = sprintf("SoftKey%02i-", k);

            me.screenElements[sftk ~ 'text']

                .setText('');

            me.screenElements[sftk ~ 'bg']

                .setColorFill(0,0,0);

        }

        # filling with the content the next boxes

        forindex (var k; path.texts) {

            var i = k + start;

            me.screenElements[sprintf("SoftKey%02i-text", i)]

                .setText(path.texts[k]);

            me.setSoftKeyColor(i,

                    contains(me.device.softkeys.colored, pathid ~ path.texts[k]));

        }

        # feeding the last boxes with empty string

        var end = (me.device.role == 'PFD') ? 10 : 12;

        if (size(path.texts) + start < end) {

            start = size(path.texts) + start;

            for (var k = start; k < end; k += 1) {

                var sftk = sprintf("SoftKey%02i-", k);

                me.screenElements[sftk ~ 'text']

                    .setText('');

                me.screenElements[sftk ~ 'bg']

                    .setColorFill(0,0,0);

            }

        }

        if (size(me.device.softkeys.path))

            me.timers2.softkeys_inactivity.restart(me.softkeys_inactivity_delay);

        else

            me.timers2.softkeys_inactivity.stop();

    },

#}}}

    updateAI: func(){

#{{{

        var pitch = data.pitch;

        var roll = data.roll;

        if (pitch > 80)

            pitch = 80;

        elsif (pitch < -80)

            pitch = -80;

        me.screenElements.Horizon

            .setCenter(459, 282.8 - 6.849 * pitch)

            .setRotation(-roll * D2R)

            .setTranslation(0, pitch * 6.849);

        me.screenElements.bankPointer

            .setRotation(-roll * D2R);

        me.screenElements['SlipSkid']

            .setTranslation(getprop("/instrumentation/slip-skid-ball/indicated-slip-skid") * 10, 0);

        settimer(func me.updateAI(), 0.1);

    },

#}}}

    updateVSI: func () {

# animate VSI {{{

        var vsi = data.vsi;

        me.screenElements.VSIText

            .setText(num(math.round(vsi, 10)));

        if (vsi > 4500)

            vsi = 4500;

        elsif (vsi < -4500)

            vsi = -4500;

        me.screenElements.VSI

            .setTranslation(0, vsi * -0.03465);

        settimer(func me.updateVSI(), 0.1);

    },

#}}}

    updateIAS: func () {

# animates the IAS lint (PFD) {{{

        var ias = data.ias;

        if (ias >= 10)

            me.screenElements.Speed110

                .setText(sprintf("% 2u",num(math.floor(ias/10))));

        else

            me.screenElements.Speed110

                .setText('');

        me.screenElements.SpeedLint1

            .setTranslation(0,(math.mod(ias,10) + (ias >= 10)*10) * 36);

        me.screenElements.SpeedTape

            .setTranslation(0,ias * 5.711);

        if (ias > data.Vne and ! me._ias_already_exceeded) { # easier than .getColorFill

            me._ias_already_exceeded = 1;

            me.screenElements['IAS-bg']

                .setColorFill(1,0,0);

        }

        elsif (ias < data.Vne and me._ias_already_exceeded) { # easier than .getColorFill

            me._ias_already_exceeded = 0;

            me.screenElements['IAS-bg']

                .setColorFill(0,0,0);

        }

        foreach (var v; ['Vx', 'Vy', 'Vr', 'Vglide']) {

            if (me.device.data[v ~ '-visible'] and abs(data[v] - ias) < 30)

                me.screenElements['IAS-' ~ v]

                    .setTranslation(0, (ias - data[v]) * 5.711)

                    .show();

            else

                me.screenElements['IAS-' ~ v]

                    .hide();

        }

        var now = systime();

        # estimated speed in 6s

        var Sy = 6 * (ias - me._last_ias_kt) / (now - me._last_ias_s);

        if (abs(Sy) > 30)

            Sy = 30 * abs(Sy)/Sy; # = -30 or 30

        me.screenElements['Airspeed-Trend-Indicator']

            .setScale(1,Sy)

            .setTranslation(0, -284.5 * (Sy - 1));

        me._last_ias_kt = ias;

        me._last_ias_s = now;

        settimer(func me.updateIAS(), 0.1);

    },

    _last_ias_kt : 0,

    _last_ias_s : systime(),

    _ias_already_exceeded : 0,

#}}}

    updateTAS: func {

# updates the True Airspeed and GroundSpeed indicators {{{

        me.screenElements['TAS-text']

            .setText(sprintf('%iKT', getprop('/instrumentation/airspeed-indicator/true-speed-kt')));

        me.screenElements['GSPD-text']

            .setText(sprintf('%iKT', getprop('/velocities/groundspeed-kt')));

        settimer(func me.updateTAS(), 0.5);

    },

#}}}

    updateALT: func () {

# animates the altitude lint (PFD) {{{

        var alt = data.alt;

        if (alt < 0)

            me.screenElements.Alt11100

                .setText(sprintf("% 3i",math.ceil(alt/100)));

        elsif (alt < 100)

            me.screenElements.Alt11100

                .setText('');

        else

            me.screenElements.Alt11100

                .setText(sprintf("% 3i",math.floor(alt/100)));

        me.screenElements.AltLint00011

            .setTranslation(0,math.fmod(alt,100) * 1.24);

        # From Farmin/G1000 http://wiki.flightgear.org/Project_Farmin/FG1000

        if (alt> -1000 and alt< 1000000) {

            var Offset10 = 0;

            var Offset100 = 0;

            var Offset1000 = 0;

            if (alt< 0) {

                var Ne = 1;

                var alt= -alt;

            }

            else

                var Ne = 0;

            var Alt10       = math.mod(alt,100);

            var Alt100      = int(math.mod(alt/100,10));

            var Alt1000     = int(math.mod(alt/1000,10));

            var Alt10000    = int(math.mod(alt/10000,10));

            var Alt20       = math.mod(Alt10,20)/20;

            if (Alt10 >= 80)

                var Alt100 += Alt20;

            if (Alt10 >= 80 and Alt100 >= 9)

                var Alt1000 += Alt20;

            if (Alt10 >= 80 and Alt100 >= 9 and Alt1000 >= 9)

                var Alt10000 += Alt20;

            if (alt> 100)

                var Offset10 = 100;

            if (alt> 1000)

                var Offset100 = 10;

            if (alt> 10000)

                var Offset1000 = 10;

            if (!Ne) {

                me.screenElements.LintAlt.setTranslation(0,(math.mod(alt,100))*0.57375);

                var altCentral = (int(alt/100)*100);

            }

            elsif (Ne) {

                me.screenElements.LintAlt.setTranslation(0,(math.mod(alt,100))*-0.57375);

                var altCentral = -(int(alt/100)*100);

            }

            me.screenElements["AltBigC"].setText("");

            me.screenElements["AltSmallC"].setText("");

            for (var place = 1; place <= 6; place += 1) {

                var altUP = altCentral + (place*100);

                var offset = -30.078;

                if (altUP < 0) {

                    var altUP = -altUP;

                    var prefix = "-";

                    var offset += 15.039;

                }

                else

                    var prefix = "";

                if (altUP == 0) {

                    var AltBigUP    = "";

                    var AltSmallUP  = "0";

                }

                elsif (math.mod(altUP,500) == 0 and altUP != 0) {

                    var AltBigUP    = sprintf(prefix~"%1d", altUP);

                    var AltSmallUP  = "";

                }

                elsif (altUP < 1000 and (math.mod(altUP,500))) {

                    var AltBigUP    = "";

                    var AltSmallUP  = sprintf(prefix~"%1d", int(math.mod(altUP,1000)));

                    var offset = -30.078;

                }

                elsif ((altUP < 10000) and (altUP >= 1000) and (math.mod(altUP,500))) {

                    var AltBigUP    = sprintf(prefix~"%1d", int(altUP/1000));

                    var AltSmallUP  = sprintf("%1d", int(math.mod(altUP,1000)));

                    var offset += 15.039;

                }

                else {

                    var AltBigUP    = sprintf(prefix~"%1d", int(altUP/1000));

                    var mod = int(math.mod(altUP,1000));

                    var AltSmallUP  = sprintf("%1d", mod);

                    var offset += 30.078;

                }

                me.screenElements["AltBigU"~place].setText(AltBigUP);

                me.screenElements["AltSmallU"~place].setText(AltSmallUP);

                me.screenElements["AltSmallU"~place].setTranslation(offset,0);

                var altDOWN = altCentral - (place*100);

                var offset = -30.078;

                if (altDOWN < 0) {

                    var altDOWN = -altDOWN;

                    var prefix = "-";

                    var offset += 15.039;

                }

                else

                    var prefix = "";

                if (altDOWN == 0) {

                    var AltBigDOWN  = "";

                    var AltSmallDOWN    = "0";

                }

                elsif (math.mod(altDOWN,500) == 0 and altDOWN != 0) {

                    var AltBigDOWN  = sprintf(prefix~"%1d", altDOWN);

                    var AltSmallDOWN    = "";

                }

                elsif (altDOWN < 1000 and (math.mod(altDOWN,500))) {

                    var AltBigDOWN  = "";

                    var AltSmallDOWN    = sprintf(prefix~"%1d", int(math.mod(altDOWN,1000)));

                    var offset = -30.078;

                }

                elsif ((altDOWN < 10000) and (altDOWN >= 1000) and (math.mod(altDOWN,500))) {

                    var AltBigDOWN  = sprintf(prefix~"%1d", int(altDOWN/1000));

                    var AltSmallDOWN    = sprintf("%1d", int(math.mod(altDOWN,1000)));

                    var offset += 15.039;

                }

                else {

                    var AltBigDOWN  = sprintf(prefix~"%1d", int(altDOWN/1000));

                    var mod = int(math.mod(altDOWN,1000));

                    var AltSmallDOWN    = sprintf("%1d", mod);

                    var offset += 30.078;

                }

                me.screenElements["AltBigD"~place].setText(AltBigDOWN);

                me.screenElements["AltSmallD"~place].setText(AltSmallDOWN);

                me.screenElements["AltSmallD"~place].setTranslation(offset,0);

            }

        }

        me.updateSelectedALT();

        var now = systime();

        # altitude in 6s

        var Sy = .3 * (alt - me._last_alt_ft) / (now - me._last_alt_s); # scale = 1/20ft

        if (abs(Sy) > 15)

            Sy = 15 * abs(Sy)/Sy; # = -15 or 15

        me.screenElements['Altitude-Trend-Indicator']

            .setScale(1,Sy)

            .setTranslation(0, -284.5 * (Sy - 1));

        me._last_alt_ft = alt;

        me._last_alt_s = now;

        settimer(func me.updateALT(), 0.2);

    },

    _last_alt_ft : 0,

    _last_alt_s  : systime(),

#}}}

    updateBARO : func () {

# update BARO widget {{{

        var fmt = me._baro_unit == 'inhg' ? '%.2f%s' : '%i%s';

        me.screenElements['BARO-text']

            .setText(sprintf(fmt,

                        getprop('/instrumentation/altimeter/setting-' ~ me._baro_unit),

                        me._baro_unit == 'inhg' ? 'in' : 'hPa')

                );

    },

    _baro_unit : 'inhg',

#}}}

    updateHSI : func () {

# rotates the compass (PFD) {{{

        var hdg = data.hdg;

        me.screenElements.Rose

            .setRotation(-hdg * D2R);

        me.screenElements['HDG-text']

            .setText(sprintf("%03u°", hdg));

        settimer(func me.updateHSI(), 0.1);

    },

#}}}

    updateHDG : func () {

# moves the heading bug and display heading-deg for 3 seconds (PFD) {{{

        if (me.device.role == 'MFD')

            return;

        var hdg = getprop('/instrumentation/zkv1000/afcs/heading-bug-deg');

        me.screenElements['Heading-bug']

            .setRotation(hdg * D2R);

        me.screenElements['SelectedHDG-bg']

            .show();

        me.screenElements['SelectedHDG-bgtext']

            .show();

        me.screenElements['SelectedHDG-text']

            .setText(sprintf('%03d°%s', hdg, ''))

            .show();

        me.addTimer(3, ['SelectedHDG-text', 'SelectedHDG-bgtext', 'SelectedHDG-bg']);

    },

#}}}

    updateCRS : func () {

# TODO: update display for NAV/GPS/BRG courses {{{

        if (me.device.role == 'MFD')

            return;

        var source = getprop('/instrumentation/zkv1000/cdi/source');

        if (source == 'OFF')

            return;

        var crs = getprop('/instrumentation/zkv1000/cdi/course');

        if (crs == nil)

            return;

        me.screenElements['SelectedCRS-bg']

            .show();

        me.screenElements['SelectedCRS-bgtext']

            .show();

        me.screenElements['SelectedCRS-text']

            .setText(sprintf('%03d°%s', crs, ''))

            .setColor(source == 'GPS' ? me.colors.magenta : me.colors.green)

            .show();

        me.addTimer(3, ['SelectedCRS-text', 'SelectedCRS-bgtext', 'SelectedCRS-bg']);

    },

#}}}

    updateSelectedALT : func {

# animation for altitude section, called via updatedALT {{{

        if (! me.screenElements['SelectedALT'].getVisible())

            return;

        var selected_alt = getprop('/instrumentation/zkv1000/afcs/selected-alt-ft');

        var delta_alt = data.alt - selected_alt;

        if (abs(delta_alt) > 300)

            delta_alt = 300 * abs(delta_alt)/delta_alt;

        me.screenElements['SelectedALT-symbol']

            .setVisible(abs(delta_alt) > 100);

        me.screenElements['SelectedALT-bg']

            .setVisible(abs(delta_alt) > 100);

        me.screenElements['SelectedALT-text']

            .setText(sprintf("%i", selected_alt))

            .setVisible(abs(delta_alt) > 100);

        me.screenElements['SelectedALT-bug']

            .setTranslation(0, delta_alt * 0.567); # 170/300 = 0.567

    },

#}}}

    updateCDI : func {

# animation for CDI {{{

        var source = getprop('/instrumentation/zkv1000/cdi/source');

        if (source == 'OFF') {

            foreach (var s; ['GPS', 'NAV1', 'NAV2'])

                foreach (var t; ['pointer', 'CDI'])

                    me.screenElements[s ~ '-' ~ t].hide();

            me.screenElements['CDI-GPS-ANN-text'].hide();

            me.screenElements['CDI-GPS-XTK-text'].hide();

            me.screenElements['CDI-SRC-text'].hide();

            me.screenElements['CDI'].hide();

        }

        else {

            var course = getprop('/instrumentation/zkv1000/cdi/course');

            var rot = (course - data.hdg) * D2R;

            me.screenElements['CDI']

                .setRotation(rot)

                .show();

            me.screenElements['GPS-CTI']

                .setVisible(getprop('/instrumentation/gps/wp/wp[1]/valid'))

                .setRotation(getprop('/instrumentation/gps/wp/wp[1]/course-deviation-deg') * D2R);

            me.screenElements['GPS-CTI-diamond']

                .setVisible(getprop('/instrumentation/gps/wp/wp[1]/valid'))

                .setRotation(getprop('/instrumentation/gps/wp/wp[1]/course-deviation-deg') * D2R);

            foreach (var s; ['GPS', 'NAV1', 'NAV2']) {

                me.screenElements[s ~ '-pointer']

                    .setRotation(rot)

                    .setVisible(source == s);

                me.screenElements[s ~ '-CDI']

                    .setVisible(source == s);

                foreach (var f; ['FROM', 'TO'])

                    me.screenElements[s ~ '-' ~ f]

                        .setVisible(s == source and getprop('/instrumentation/zkv1000/cdi/' ~ f ~ '-flag'));

                me.screenElements['CDI-SRC-text']

                    .setText(source)

                    .setColor(source == 'GPS' ? me.colors.magenta : me.colors.green)

                    .show();

            }

            var deflection = getprop('/instrumentation/zkv1000/cdi/course-deflection');

            if (left(source, 3) == 'NAV')

                var scale = deflection / 4;

            else { # GPS

                # TODO: deviation depending of the flight phase

                # for now fixed 1 dot = 1 nm course error

                var abs_deflection = abs(deflection);

                me.screenElements['CDI-GPS-XTK-text']

                    .setText(sprintf('XTK %iNM', abs_deflection))

                    .setVisible(abs_deflection > 2.4);

                var scale = deflection / 2;

            }

            scale = (abs(scale) > 1.2) ? 1.2 : scale;

            me.screenElements[source ~ '-CDI']

                .setTranslation(65 * scale, 0);

            settimer(func me.updateCDI(), 0.3);

        }

    },

#}}}

    _updateRadio: func {

# common parts for NAV/LOC/COMM radios{{{

        # arg[0]._r = <comm|nav>

        if (contains(arg[0], "active")) {

            if (arg[0]['active'] == 'none') {

                me.screenElements[arg[0]._r ~ '1-selected-freq']

                    .setColor(1,1,1);

                me.screenElements[arg[0]._r ~ '2-selected-freq']

                    .setColor(1,1,1);

            }

            else {

                me.screenElements[arg[0]._r ~ arg[0]['active'] ~ '-selected-freq']

                    .setColor(0,1,0);

                me.screenElements[arg[0]._r ~ arg[0].inactive ~ '-selected-freq']

                    .setColor(1,1,1);

            }

        }

        if (contains(arg[0], 'tune')) {

            # n = 0 -> NAV1/COMM1

            # n = 1 -> NAV1/COMM2

            me.screenElements[arg[0]._r ~ '-freq-switch']

                .setTranslation(0, arg[0].tune * 25);

            me.screenElements[arg[0]._r ~ (arg[0].tune + 1) ~ '-standby-freq']

                .setColor(0,1,1);

            me.screenElements[arg[0]._r ~ ((arg[0].tune == 0) + 1) ~ '-standby-freq']

                .setColor(1,1,1);

        }

        if (contains(arg[0], 'refresh')) {

            # refresh only one line: NAV1/COMM1 or NAV2/COMM2

            var fmt = (arg[0]._r == 'nav') ? '%.2f' : '%.3f';

            me.screenElements[arg[0]._r ~ arg[0].refresh ~ '-selected-freq']

                .setText(sprintf(fmt, getprop('/instrumentation/'

                               ~ arg[0]._r ~ '[' ~ (arg[0].refresh - 1) ~ ']/frequencies/selected-mhz')));

            me.screenElements[arg[0]._r ~ arg[0].refresh ~ '-standby-freq']

                .setText(sprintf(fmt, getprop('/instrumentation/'

                               ~ arg[0]._r ~ '[' ~ (arg[0].refresh - 1) ~ ']/frequencies/standby-mhz')));

        }

        if (contains(arg[0], 'set')) {

            # positionne la valeur modifiée, les listeners "trigguent" en permanence ces propriétés, donc exit

            var n = getprop('/instrumentation/zkv1000/radios/' ~ arg[0]._r ~ '-tune');

            var fmt = (arg[0]._r == 'nav') ? '%.2f' : '%.3f';

            me.screenElements[arg[0]._r ~ (n + 1) ~ '-standby-freq']

                .setText(sprintf(fmt, getprop('/instrumentation/' ~ arg[0]._r ~ '[' ~ n ~ ']/frequencies/standby-mhz')));

        }

        if (contains(arg[0], 'auto')) {

            # pour rafraichir automagiquement, toutes les deux secondes un refresh pour un NAV

            var radio = arg[0].auto;

            me._updateRadio({refresh: 1, _r: radio});

            settimer(func me._updateRadio({refresh: 2, _r: radio}), 1);

            settimer(func me._updateRadio({auto: radio}), 2);

        }

    },

#}}}

    updateNAV : func {

# update NAV/LOC rodios display upper left (PFD/MFD){{{

        # made active via menu

        if (contains(arg[0], "active")) {

            arg[0]._r = 'nav';

            if (arg[0]['active'] == 'none') {

                me._updateRadio(arg[0]);

                me.screenElements['nav1-id']

                    .setColor(1,1,1);

                me.screenElements['nav2-id']

                    .setColor(1,1,1);

                me.screenElements['NAV1-pointer']

                    .hide();

                me.screenElements['NAV2-pointer']

                    .hide();

            }

            else {

                arg[0].inactive = (arg[0]['active'] == 1) + 1;

                me._updateRadio(arg[0]);

                me.screenElements['nav' ~ arg[0]['active'] ~ '-id']

                    .setColor(0,1,0);

                me.screenElements['NAV' ~ arg[0]['active'] ~ '-pointer']

                    .show();

                me.screenElements['nav' ~ arg[0].inactive ~ '-id']

                    .setColor(1,1,1);

#                me.screenElements['HDI']

#                    .setRotation();

#                me.screenElements['NAV' ~ inactive ~ '-pointer']

#                    .hide();

#                foreach (var e; [ 'FROM', 'TO', 'CDI' ])

#                    me.screenElements['NAV' ~ inactive ~ '-' ~ e]

#                        .hide();

            }

        }

        elsif (contains(arg[0], 'nav-id')) {

            # TODO: récupérer la valeur via les paramètres transmis du listener

            if (arg[0].val == nil)

                arg[0].val = '';

            me.screenElements["nav" ~ arg[0]['nav-id'] ~ "-id"]

                    .setText(arg[0].val);

        }

        else {

            arg[0]._r = 'nav';

            me._updateRadio(arg[0]);

        }

    },

#}}}

    updateCOMM: func {

# update COMM radios display upper right (PFD/MFD){{{

        arg[0]._r = 'comm';

        me._updateRadio(arg[0]);

    },

#}}}

    updateTIME : func {

# updates the displayed time botoom left {{{

        me.screenElements['TIME-text']

            .setText(getprop('/sim/time/gmt-string'));

        settimer(func me.updateTIME(), 1);

    },

#}}}

    updateXPDR : func {

# updates transponder display {{{

        for (var d = 0; d < 4; d+=1)

            me.screenElements['XPDR-DIGIT-' ~ d ~ '-text']

                .setText(sprintf('%i', getprop('/instrumentation/transponder/inputs/digit[' ~ d ~ ']')));

        var tuning = getprop('/instrumentation/zkv1000/radios/xpdr-tuning-digit');

        var fms = getprop('/instrumentation/zkv1000/radios/xpdr-tuning-fms-method');

        for (var d = 0; d < 4; d+=1)

            me.screenElements['XPDR-DIGIT-' ~ d ~ '-text']

                .setColor(1,1,1);

        if (tuning != nil) {

            me.screenElements['XPDR-DIGIT-' ~ tuning ~ '-text']

                .setColor(0,1,1);

            if (fms)

                me.screenElements['XPDR-DIGIT-' ~ (tuning - 1) ~ '-text']

                    .setColor(0,1,1);

        }

        else {

            if (getprop('/instrumentation/transponder/ident'))

                var mode = 'IDENT';

            else

                var mode = getprop('/instrumentation/zkv1000/radio/xpdr-mode');

            var wow = getprop('/gear/gear/wow');

            if (! wow and mode != 'STBY')

                var color = [0, 1, 0];

            else

                var color = [1, 1, 1];

            for (var d = 0; d < 4; d+=1)

                me.screenElements['XPDR-DIGIT-' ~ d ~ '-text']

                    .setColor(color);

            me.screenElements['XPDR-MODE-text']

                .setColor(color)

                .setText(mode);

        }

    },

#}}}

    updateOAT : func {

# update OAT display on normal and reversionnary modes (every 3s) {{{

        var tmp = getprop('/environment/temperature-deg' ~ me._oat_unit);

        me.screenElements['OAT-text']

            .setText(sprintf((abs(tmp) < 10) ? "%.1f %s" : "%i %s", tmp, (me._oat_unit == 'c') ? '°C' : 'F'));

        settimer(func me.updateOAT(), 3);

    },

    _oat_unit : 'c',

#}}}

    updateWindData : func {

# update the window text and arrows for OPTN1/2 {{{

        if (me._winddata_optn == 0)

            return;

        if (data.ias < 30) {

            me.screenElements['WindData-NODATA']

                .hide();

            var wind_hdg = getprop('/environment/wind-from-heading-deg');

            var wind_spd = getprop('/environment/wind-speed-kt');

            var alpha = wind_hdg - data.hdg;

            if (me._winddata_optn == 1) {

                me.screenElements['WindData-OPTN1-HDG']

                    .setRotation((alpha + 180) * D2R)

                    .show();

                me.screenElements['WindData-OPTN1-HDG-text']

                    .setText(sprintf("%03i°", wind_hdg))

                    .show();

                me.screenElements['WindData-OPTN1-SPD-text']

                    .setText(int(wind_spd) ~ 'KT')

                    .show();

            }

            else { # me._winddata_optn == 2

                alpha *= D2R;

                var Vt = wind_spd * math.sin(alpha);

                var Ve = wind_spd * math.cos(alpha);

                if (Vt != 0) {

                    me.screenElements['WindData-OPTN2-crosswind-text']

                        .setText(sprintf('%i', abs(Vt)))

                        .show();

                    me.screenElements['WindData-OPTN2-crosswind']

                        .setScale(-abs(Vt)/Vt, 1)

                        .setTranslation(-35 * (abs(Vt)/Vt + 1), 0)

                        .show();

                }

                if (Ve != 0) {

                    me.screenElements['WindData-OPTN2-headwind-text']

                        .setText(sprintf('%i', abs(Ve)))

                        .show();

                    me.screenElements['WindData-OPTN2-headwind']

                        .setScale(1, abs(Ve)/Ve)

                        .setTranslation(0, 515 * (1 - abs(Ve)/Ve))

                        .show();

                }

            }

        }

        else {

            foreach (var e; [

                    'WindData-OPTN1-HDG',

                    'WindData-OPTN1-HDG-text',

                    'WindData-OPTN1-SPD-text',

                    'WindData-OPTN2-crosswind-text',

                    'WindData-OPTN2-crosswind',

                    'WindData-OPTN2-headwind-text',

                    'WindData-OPTN2-headwind'

            ])

                me.screenElements[e].hide();

            me.screenElements['WindData-NODATA'].show();

        }

        settimer(func me.updateWindData(), 0.5);

    },

    _winddata_optn : 0,

#}}}