MDT-Webapps-Gulp/code/exercise03/app/scripts/landung.js

function simulation() {

    function switchOn() {
        schub = true;
        update();
    }

    function switchOff() {
        schub = false;
        update();
    }

    function a() {
        if (schub == false || fuel <= 0)
            return -1.63;
        else {
            fuel = fuel - 100;
            return -1.63 + 12;
        }
    }

    function setStartValues() {
        var v = -1000;
        var s = 50000;
        var fuel = 10000;
        var schub = false;
    }
    function update() {
        v = v + a();
        s = s + v;
        if (s <= 0) {
            s = 0;
            gameOver();
        }
        $("#height").html("Höhe: " + s + "m");
        $("#speed").html("Geschwindigkeit: " + v + "m/s");
        $("#fuel").html("Treibstoffvorrat: " + fuel + "l");
    }

    function gameOver() {
        if (v > -10)
            alert("Mondlandung geglückt!!!");
        else
            alert("Mondlandung gescheitert ...");
        setStartValues();
    }

    $("body").append("<div id='height'>Höhe: </div>");
    $("body").append("<div id='speed'>Geschwindigkeit: </div>");
    $("body").append("<div id='fuel'>Treibstoffvorrat: </div>");

    $("body").append("<button id='energy'>Triebwerk an</button>");
    $("body").append("<button id='no-energy'>Triebwerk aus</button>");

    $("#energy").click(switchOn);
    $("#no-energy").click(switchOff);
    setStartValues();
}

$(document).ready(simulation);