helpers.js

"use strict"

var Helpers = {

    getEarthCircumference : function() { return 2 * Math.PI * (6378.1 * 1000); },
    getColor : function(colorName) { return Helpers.colors[colorName];},

//map of all default CSS color names
    colors : {
    "aliceblue":"#f0f8ff","antiquewhite":"#faebd7","aqua":"#00ffff","aquamarine":"#7fffd4","azure":"#f0ffff",
    "beige":"#f5f5dc","bisque":"#ffe4c4","black":"#000000","blanchedalmond":"#ffebcd","blue":"#0000ff",
    "blueviolet":"#8a2be2","brown":"#a52a2a","burlywood":"#deb887","cadetblue":"#5f9ea0","chartreuse":"#7fff00",
    "chocolate":"#d2691e","coral":"#ff7f50","cornflowerblue":"#6495ed","cornsilk":"#fff8dc","crimson":"#dc143c",
    "cyan":"#00ffff","darkblue":"#00008b","darkcyan":"#008b8b","darkgoldenrod":"#b8860b","darkgray":"#a9a9a9",
    "darkgreen":"#006400","darkkhaki":"#bdb76b","darkmagenta":"#8b008b","darkolivegreen":"#556b2f","darkorange":"#ff8c00",
    "darkorchid":"#9932cc","darkred":"#8b0000","darksalmon":"#e9967a","darkseagreen":"#8fbc8f","darkslateblue":"#483d8b",
    "darkslategray":"#2f4f4f","darkturquoise":"#00ced1","darkviolet":"#9400d3","deeppink":"#ff1493","deepskyblue":"#00bfff",
    "dimgray":"#696969","dodgerblue":"#1e90ff","firebrick":"#b22222","floralwhite":"#fffaf0","forestgreen":"#228b22",
    "fuchsia":"#ff00ff","gainsboro":"#dcdcdc","ghostwhite":"#f8f8ff","gold":"#ffd700","goldenrod":"#daa520",
    "gray":"#808080","green":"#008000","greenyellow":"#adff2f","honeydew":"#f0fff0","hotpink":"#ff69b4",
    "indianred":"#cd5c5c","indigo":"#4b0082","ivory":"#fffff0","khaki":"#f0e68c","lavender":"#e6e6fa",
    "lavenderblush":"#fff0f5","lawngreen":"#7cfc00","lemonchiffon":"#fffacd","lightblue":"#add8e6","lightcoral":"#f08080",
    "lightcyan":"#e0ffff","lightgoldenrodyellow":"#fafad2","lightgrey":"#d3d3d3","lightgreen":"#90ee90",
    "lightpink":"#ffb6c1","lightsalmon":"#ffa07a","lightseagreen":"#20b2aa","lightskyblue":"#87cefa",
    "lightslategray":"#778899","lightsteelblue":"#b0c4de","lightyellow":"#ffffe0","lime":"#00ff00","limegreen":"#32cd32",
    "linen":"#faf0e6","magenta":"#ff00ff","maroon":"#800000","mediumaquamarine":"#66cdaa","mediumblue":"#0000cd",
    "mediumorchid":"#ba55d3","mediumpurple":"#9370d8","mediumseagreen":"#3cb371","mediumslateblue":"#7b68ee",
    "mediumspringgreen":"#00fa9a","mediumturquoise":"#48d1cc","mediumvioletred":"#c71585","midnightblue":"#191970",
    "mintcream":"#f5fffa","mistyrose":"#ffe4e1","moccasin":"#ffe4b5","navajowhite":"#ffdead","navy":"#000080",
    "oldlace":"#fdf5e6","olive":"#808000","olivedrab":"#6b8e23","orange":"#ffa500","orangered":"#ff4500","orchid":"#da70d6",
    "palegoldenrod":"#eee8aa","palegreen":"#98fb98","paleturquoise":"#afeeee","palevioletred":"#d87093",
    "papayawhip":"#ffefd5","peachpuff":"#ffdab9","peru":"#cd853f","pink":"#ffc0cb","plum":"#dda0dd","powderblue":"#b0e0e6",
    "purple":"#800080","red":"#ff0000","rosybrown":"#bc8f8f","royalblue":"#4169e1","saddlebrown":"#8b4513",
    "salmon":"#fa8072","sandybrown":"#f4a460","seagreen":"#2e8b57","seashell":"#fff5ee","sienna":"#a0522d",
    "silver":"#c0c0c0","skyblue":"#87ceeb","slateblue":"#6a5acd","slategray":"#708090","snow":"#fffafa",
    "springgreen":"#00ff7f","steelblue":"#4682b4","tan":"#d2b48c","teal":"#008080","thistle":"#d8bfd8","tomato":"#ff6347",
    "turquoise":"#40e0d0","violet":"#ee82ee","wheat":"#f5deb3","white":"#ffffff","whitesmoke":"#f5f5f5","yellow":"#ffff00",
    "yellowgreen":"#9acd32"}

};

var daysPerMonth = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];

function getDayString(dayOfYear)
{
    var day = ((dayOfYear % 366) | 0)+1;
    var monthNames = ["January","February","March","April","May","June","July","August","September","October","November","December"];
    
    for (var month = 0; day > daysPerMonth[month]; month++)
        day -= daysPerMonth[month];
        
    return monthNames[month] + ", " + day;
}

/*
function getDayOfYear(date)
{
    var month = date.getMonth();        //Note the JavaScript Date API is 0-based for the getMonth(),
    var dayOfYear = date.getDate()-1;   //but 1-based for getDate()
    
    for (var i = 0; i < month; i++)
        dayOfYear += daysPerMonth[i];

    //for now, we just ignore leap years altogether        
    //var year = date.getFullYear();
    //var isLeapYear =  (year % 4 == 0 && (year % 100 != 0 || year % 400 == 0));
    
    //in a leap year, every day after February 28th is one day further from the beginning of that year than normal
    //if (isLeapYear && dayOfYear > daysPerMonth[0] + daysPerMonth[1])
    //    dayOfYear += 1;
        
    return dayOfYear;
}*/

function getDayOfYear( date ) {
    var year = new Date(date.getFullYear(), 0, 0);
    var dt = date.valueOf() - year.valueOf();  //milliseconds since beginning of year
    return dt/ (1000 * 24 * 60 * 60);
}

function toDictionary (queryString)
{
    var parts = queryString.split("&");
    var res = {};
    for (var i in parts)
    {
        var kv = parts[i].split("=");
        if (kv.length == 2)
        {
            res[kv[0]] = parseFloat(kv[1]);
        }
    }
    return res;
}