# This is most an example than a really efficient EIS

# power % is throttle %

# assumes that there are two tanks with equals quantity...

displayClass.showEIS = func (groups) {

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

    append(groups.show, 'EIS', 'POWER-pointer', 'FUEL-RIGHT-pointer', 'FUEL-LEFT-pointer');

    append(groups.text,

            'RPM-text', 'EGT-text', 'CHT-text', 'FUEL-USED-text',

            'FUEL-FLOW-text', 'MAN-Hg-text', 'POWER-PERCENT-text',

            'RPM-text', 'BUS-V-text', 'BATT-text', 'PSI-text',

            'OIL-TEMP-text'

        );

};

displayClass.updateEIS = func {

# displays Engine Informations System

    var running = getprop('/engines/engine/running');

    if (running != nil) {

        var power = getprop('/controls/engines/engine/throttle') * running;

        me.screenElements['POWER-pointer']

            .setRotation(D2R * 140 * power);

        me.screenElements['POWER-PERCENT-text']

            .setText(sprintf('% 3u', power * 100));

        me.screenElements['RPM-text']

            .setText(sprintf(math.round(getprop('/engines/engine/rpm'), 50)));

        me.screenElements['MAN-Hg-text']

            .setText(sprintf('%.1d', getprop('/engines/engine/mp-inhg')));

        me.screenElements['FUEL-FLOW-text']

            .setText(sprintf('%.1f', getprop('/engines/engine/fuel-flow-gph')));

        if (math.mod(me._eis_count, 10) == 0) {

            var psi = getprop('/engines/engine/oil-pressure-psi');

            me.screenElements['PSI-text']

                .setText(psi == nil ? '--' : sprintf('%u', psi));

            me.screenElements['OIL-TEMP-text']

                .setText(sprintf('%i', getprop('/engines/engine/oil-temperature-degf')));

            var full = getprop('/instrumentation/zkv1000/eis/fuel-qty-at-start');

            var right = getprop('/consumables/fuel/tank/level-gal_us');

            var left = getprop('/consumables/fuel/tank[1]/level-gal_us');

            var used_fuel = full - (right + left);

            me.screenElements['FUEL-USED-text']

                .setText(sprintf('%.1d', used_fuel > 0 ? used_fuel : 0));

            me.screenElements['FUEL-RIGHT-pointer']

                .setTranslation(

                        0,

                        (1 - right / (full/2)) * 80

                    );

            me.screenElements['FUEL-LEFT-pointer']

                .setTranslation(

                        0,

                        (1 - left / (full/2)) * 80

                    );

            me.screenElements['BUS-V-text']

                .setText(sprintf('%.1i', getprop('/systems/electrical/outputs/bus')));

            me.screenElements['BATT-text']

                .setText(sprintf('%+i', getprop('/systems/electrical/amps')));

            var cht = getprop('/engines/engine/cht-degf');

            me.screenElements['CHT-text']

                .setText(cht == nil ? '--' : sprintf('%i', cht));

            me.screenElements['EGT-text']

                .setText(sprintf('%i', getprop('/engines/engine/egt-degf')));

        }

    }

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

    me._eis_count += 1;

};

displayClass._eis_count = 0;