planets.js Example File

planets-qml/planets.js
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 .pragma library

 var SUN = 0;
 var MERCURY = 1;
 var VENUS = 2;
 var EARTH = 3;
 var MARS = 4;
 var JUPITER = 5;
 var SATURN = 6;
 var URANUS = 7;
 var NEPTUNE = 8;
 var NUM_SELECTABLE_PLANETS = 9;
 var MOON = 9;
 var SOLAR_SYSTEM = 100;

 function planetId(planetName) {
     switch (planetName) {
     case "Sun":
         return SUN
     case "Mercury":
         return MERCURY
     case "Venus":
         return VENUS
     case "Earth":
         return EARTH
     case "Mars":
         return MARS
     case "Jupiter":
         return JUPITER
     case "Saturn":
         return SATURN
     case "Uranus":
         return URANUS
     case "Neptune":
         return NEPTUNE
     case "Solar System":
         return SOLAR_SYSTEM
     }
 }

 function planetIndex(planetName) {
     switch (planetName) {
     case "Sun":
         return 0
     case "Mercury":
         return 1
     case "Venus":
         return 2
     case "Earth":
         return 3
     case "Mars":
         return 4
     case "Jupiter":
         return 5
     case "Saturn":
         return 6
     case "Uranus":
         return 7
     case "Neptune":
         return 8
     case "Solar System":
         return 9
     }
 }

 var planets = []; // Planet data info

 var solarDistance = 2600000;
 var saturnOuterRadius = 120.700;
 var uranusOuterRadius = 40;

 var auScale = 149597.870700; // AU in thousands of kilometers

 function loadPlanetData() {

     // Planet Data
     // radius - planet radius
     // tilt - planet axis angle
     // N1/2 - longitude of the ascending node
     // i1/2 - inclination to the ecliptic (plane of the Earth's orbit)
     // w1/2 - argument of perihelion
     // a1/2 - semi-major axis, or mean distance from Sun
     // e1/2 - eccentricity (0=circle, 0-1=ellipse, 1=parabola)
     // M1/2 - mean anomaly (0 at perihelion; increases uniformly with time)
     // period - sidereal rotation period
     // centerOfOrbit - the planet in the center of the orbit
     // (orbital elements based on http://www.stjarnhimlen.se/comp/ppcomp.html)

     var sun = { radius: 694.439, tilt: 63.87, period: 25.05, x: 0, y: 0, z: 0,
         roll: 0 };
     planets.push(sun);
     var mercury = {
         radius: 2.433722, tilt: 0.04, N1: 48.3313, N2: 0.0000324587,
         i1: 7.0047, i2: 0.0000000500, w1: 29.1241, w2: 0.0000101444,
         a1: 0.387098, a2: 0, e1: 0.205635, e2: 0.000000000559,
         M1: 168.6562, M2: 4.0923344368, period: 58.646, x: 0, y: 0, z: 0,
         roll: 0, centerOfOrbit: SUN
     };
     planets.push(mercury);
     var venus = {
         radius: 6.046079, tilt: 177.36, N1: 76.6799, N2: 0.0000246590,
         i1: 3.3946, i2: 0.0000000275, w1: 54.8910, w2: 0.0000138374,
         a1: 0.723330, a2: 0, e1: 0.006773, e2: -0.000000001302,
         M1: 48.0052, M2: 1.6021302244, period: 243.0185, x: 0, y: 0, z: 0,
         roll: 0, centerOfOrbit: SUN
     };
     planets.push(venus);
     var earth = {
         radius: 6.371, tilt: 25.44, N1: 174.873, N2: 0,
         i1: 0.00005, i2: 0, w1: 102.94719, w2: 0,
         a1: 1, a2: 0, e1: 0.01671022, e2: 0,
         M1: 357.529, M2: 0.985608, period: 0.997, x: 0, y: 0, z: 0,
         roll: 0, centerOfOrbit: SUN
     };
     planets.push(earth);
     var mars = {
         radius: 3.389372, tilt: 25.19, N1: 49.5574, N2: 0.0000211081,
         i1: 1.8497, i2: -0.0000000178, w1: 286.5016, w2: 0.0000292961,
         a1: 1.523688, a2: 0, e1: 0.093405, e2: 0.000000002516,
         M1: 18.6021, M2: 0.5240207766, period: 1.025957, x: 0, y: 0, z: 0,
         roll: 0, centerOfOrbit: SUN
     };
     planets.push(mars);
     var jupiter = {
         radius: 71.41254, tilt: 3.13, N1: 100.4542, N2: 0.0000276854,
         i1: 1.3030, i2: -0.0000001557, w1: 273.8777, w2: 0.0000164505,
         a1: 5.20256, a2: 0, e1: 0.048498, e2: 0.000000004469,
         M1: 19.8950, M2: 0.0830853001, period: 0.4135, x: 0, y: 0, z: 0,
         roll: 0, centerOfOrbit: SUN
     };
     planets.push(jupiter);
     var saturn = {
         radius: 60.19958, tilt: 26.73, N1: 113.6634, N2: 0.0000238980,
         i1: 2.4886, i2: -0.0000001081, w1: 339.3939, w2: 0.0000297661,
         a1: 9.55475, a2: 0, e1: 0.055546, e2: -0.000000009499,
         M1: 316.9670, M2: 0.0334442282, period: 0.4395, x: 0, y: 0, z: 0,
         roll: 0, centerOfOrbit: SUN
     };
     planets.push(saturn);
     var uranus = {
         radius: 25.5286, tilt: 97.77, N1: 74.0005, N2: 0.000013978,
         i1: 0.7733, i2: 0.000000019, w1: 96.6612, w2: 0.000030565,
         a1: 19.18171, a2: -0.0000000155, e1: 0.047318, e2: 0.00000000745,
         M1: 142.5905, M2: 0.011725806, period: 0.71833, x: 0, y: 0, z: 0,
         roll: 0, centerOfOrbit: SUN
     };
     planets.push(uranus);
     var neptune = {
         radius: 24.73859, tilt: 28.32, N1: 131.7806, N2: 0.000030173,
         i1: 1.7700, i2: -0.000000255, w1: 272.8461, w2: 0.000006027,
         a1: 30.05826, a2: 0.00000003313, e1: 0.008606, e2: 0.00000000215,
         M1: 260.2471, M2: 0.005995147, period: 0.6713, x: 0, y: 0, z: 0,
         roll: 0, centerOfOrbit: SUN
     };
     planets.push(neptune);
     var moon = {
         radius: 1.5424, tilt: 28.32, N1: 125.1228, N2: -0.0529538083,
         i1: 5.1454, i2: 0, w1: 318.0634, w2: 0.1643573223,
         a1: 0.273, a2: 0, e1: 0.054900, e2: 0,
         M1: 115.3654, M2: 13.0649929509, period: 27.321582, x: 0, y: 0, z: 0,
         roll: 0, centerOfOrbit: EARTH
     };
     planets.push(moon);

     return planets;
 }

 function getOuterRadius(planet) {
     var outerRadius = solarDistance;
     if (planet !== SOLAR_SYSTEM) {
         outerRadius = planets[planet]["radius"];
         if (planet === SATURN) {
             outerRadius =+ saturnOuterRadius;
         } else if (planet === URANUS) {
             outerRadius =+ uranusOuterRadius;
         } else if (planet === SUN) {
             outerRadius = planets[planet]["radius"] / 100;
         }
     }

     return outerRadius;
 }