buoy-analysis/client/data.js

var BuoyAnalysisData = {
    mapW: 900,

    mapH: 600,

    mapJson: {},

    stationJson: {},

    years: {
        start: 1982,
        end: 2015
    },

    axis: {
        h: 200,
        min: 100,
        max: 0,
        scale: null,
        scaleInverted: null,
        fahrenheit: null,
        celsius: null
    },

    /**
     *
     */
    populateMapData: function() {
        return new Promise(function(resolve) {
            d3.json('client/_map.json', function(error, json) {
                BuoyAnalysisData.mapJson = json;
                resolve();
            });
        });
    },

    /**
     *
     */
    populateSrcFile: function() {
        return new Promise(function(resolve) {
            d3.json('client/_stations.json', function(error, json) {
                BuoyAnalysisData.stationJson = json;
                resolve();
            });
        });
    },

    /**
     *
     */
    setAxisProperties: function() {
        var json = BuoyAnalysisData.stationJson;

        for (var id in json) {
            for (var prop in json[id]) {
                if (prop === 'id' || prop === 'lat' || prop === 'lon' || prop === 'name') {
                    continue;
                }

                for (var i = 0; i < 12; i++) {
                    if (json[id][prop]['m'][i] <= 0) {
                        continue;
                    }

                    if (json[id][prop]['m'][i] < BuoyAnalysisData.axis.min) {
                        BuoyAnalysisData.axis.min = json[id][prop]['m'][i];
                    }

                    if (json[id][prop]['m'][i] > BuoyAnalysisData.axis.max) {
                        BuoyAnalysisData.axis.max = json[id][prop]['m'][i];
                    }
                }
            }
        }

        // console.warn("MIN: " + BuoyAnalysisData.axis.min + ', MAX: ' + BuoyAnalysisData.axis.max)

        BuoyAnalysisData.axis.scale = d3.scale.linear()
                                        .domain([BuoyAnalysisData.axis.min, BuoyAnalysisData.axis.max])
                                        .range([BuoyAnalysisData.axis.h, 0]);

        BuoyAnalysisData.axis.scaleInverted = d3.scale.linear()
                                        .domain([BuoyAnalysisData.axis.min, BuoyAnalysisData.axis.max])
                                        .range([0, BuoyAnalysisData.axis.h]);

        BuoyAnalysisData.axis.fahrenheit = d3.svg.axis()
                                        .scale(BuoyAnalysisData.axis.scale)
                                        .orient("left")
                                        .tickFormat(function(d) { return Math.round(d * 9 / 5 + 32); })
                                        .tickValues([10, 13, 15.5, 18.5, 21]);

        BuoyAnalysisData.axis.celsius = d3.svg.axis()
                                        .scale(BuoyAnalysisData.axis.scale)
                                        .orient("right")
                                        .tickValues([10, 13, 15.5, 18.5, 21]);
    },

    /**
     *
     */
    calculateYearlyAverages: function(stations) {
        var sum, count, avg;
        var years = [];

        for (var year = BuoyAnalysisData.years.start; year <= BuoyAnalysisData.years.end; year++) {
            sum = 0;
            count = 0;

            stations.forEach(function(id) {
                data = BuoyAnalysisData.stationJson[id]['avgs' + year];

                if (data === undefined || data.y === 0) {
                    return;
                }

                sum += data.y;
                count++;
            });

            years.push({ average: (sum / count) || 0, year: year });
        }

        return years;
    },

    /**
     *
     */
    calculateMonthlyAverages: function(stations) {
        var sum, count, data;
        var months = [];

        for (var year = BuoyAnalysisData.years.start; year <= BuoyAnalysisData.years.end; year++) {
            for (var month = 0; month < 12; month++) {
                sum = 0;
                count = 0;

                stations.forEach(function(id) {
                    data = BuoyAnalysisData.stationJson[id]['avgs' + year];

                    if (data === undefined || data.m[month] === 0) {
                        return;
                    }

                    sum += data.m[month];
                    count++;
                });

                months.push({ average: (sum / count) || 0, month: month, year: year });
            }
        };

        return months;
    }
};