buoy-analysis/js/data.js

var BuoyAnalysisData = {
    mapW: 500,

    mapH: 600,

    mapJson: {},

    stationJson: {},

    property: 'wt',

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

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

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

    /**
     *
     */
    setAxisProperties: function() {
        var json = BuoyAnalysisData.stationJson;
        var property = BuoyAnalysisData.property;
        var tickValues = BuoyAnalysisChart.bars.tickValues;

        BuoyAnalysisChart.axis.min = 100;
        BuoyAnalysisChart.axis.max = 0;

        for (var id in json) {
            for (var year = BuoyAnalysisData.years.start; year <= BuoyAnalysisData.years.end; year++) {
                for (var i = 0; i < 12; i++) {
                    if (json[id]['a' + year][property]['m'][i] <= 0) {
                        continue;
                    }

                    if (json[id]['a' + year][property]['m'][i] < BuoyAnalysisChart.axis.min) {
                        BuoyAnalysisChart.axis.min = json[id]['a' + year][property]['m'][i];
                    }

                    if (json[id]['a' + year][property]['m'][i] > BuoyAnalysisChart.axis.max) {
                        BuoyAnalysisChart.axis.max = json[id]['a' + year][property]['m'][i];
                    }
                }
            }
        }

        BuoyAnalysisChart.axis.scale = d3.scale.linear().domain([0, BuoyAnalysisChart.axis.max])
                                        .range([0, BuoyAnalysisChart.bars.width]);

        BuoyAnalysisChart.axis.imperial = d3.svg.axis()
                                        .scale(BuoyAnalysisChart.axis.scale)
                                        .orient("top")
                                        .tickFormat(function(d) {
                                            var val;

                                            switch(BuoyAnalysisData.property) {
                                                case 'at':
                                                case 'wt':
                                                    val = Math.round(d * 9 / 5 + 32);
                                                    break;

                                                case 'wh':
                                                case 'ws':
                                                    val = Math.round(d * 3.28 * 10) / 10;
                                                    break;

                                                case 'wp':
                                                    val = d;
                                                    break;
                                            };

                                            return val;
                                        })
                                        .tickValues(tickValues);

        BuoyAnalysisChart.axis.metric = d3.svg.axis()
                                        .scale(BuoyAnalysisChart.axis.scale)
                                        .orient("bottom")
                                        .tickValues(tickValues);
    },

    /**
     *
     */
    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]['a' + year][BuoyAnalysisData.property];

                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]['a' + year][BuoyAnalysisData.property];

                    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;
    }
};