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+Sencha Documentation Project/**
+ * @class Ext.chart.axis.Time
+ * @extends Ext.chart.axis.Axis
+ *
+ * A type of axis whose units are measured in time values. Use this axis
+ * for listing dates that you will want to group or dynamically change.
+ * If you just want to display dates as categories then use the
+ * Category class for axis instead.
+ *
+ * For example:
+ *
+ * axes: [{
+ * type: 'Time',
+ * position: 'bottom',
+ * fields: 'date',
+ * title: 'Day',
+ * dateFormat: 'M d',
+ * groupBy: 'year,month,day',
+ * aggregateOp: 'sum',
+ *
+ * constrain: true,
+ * fromDate: new Date('1/1/11'),
+ * toDate: new Date('1/7/11')
+ * }]
+ *
+ * In this example we're creating a time axis that has as title *Day*.
+ * The field the axis is bound to is `date`.
+ * The date format to use to display the text for the axis labels is `M d`
+ * which is a three letter month abbreviation followed by the day number.
+ * The time axis will show values for dates between `fromDate` and `toDate`.
+ * Since `constrain` is set to true all other values for other dates not between
+ * the fromDate and toDate will not be displayed.
+ *
+ * @constructor
+ */
+Ext.define('Ext.chart.axis.Time', {
+
+ /* Begin Definitions */
+
+ extend: 'Ext.chart.axis.Category',
+
+ alternateClassName: 'Ext.chart.TimeAxis',
+
+ alias: 'axis.time',
+
+ requires: ['Ext.data.Store', 'Ext.data.JsonStore'],
+
+ /* End Definitions */
+
+ /**
+ * The minimum value drawn by the axis. If not set explicitly, the axis
+ * minimum will be calculated automatically.
+ * @property calculateByLabelSize
+ * @type Boolean
+ */
+ calculateByLabelSize: true,
+
+ /**
+ * Indicates the format the date will be rendered on.
+ * For example: 'M d' will render the dates as 'Jan 30', etc.
+ *
+ * @property dateFormat
+ * @type {String|Boolean}
+ */
+ dateFormat: false,
+
+ /**
+ * Indicates the time unit to use for each step. Can be 'day', 'month', 'year' or a comma-separated combination of all of them.
+ * Default's 'year,month,day'.
+ *
+ * @property timeUnit
+ * @type {String}
+ */
+ groupBy: 'year,month,day',
+
+ /**
+ * Aggregation operation when grouping. Possible options are 'sum', 'avg', 'max', 'min'. Default's 'sum'.
+ *
+ * @property aggregateOp
+ * @type {String}
+ */
+ aggregateOp: 'sum',
+
+ /**
+ * The starting date for the time axis.
+ * @property fromDate
+ * @type Date
+ */
+ fromDate: false,
+
+ /**
+ * The ending date for the time axis.
+ * @property toDate
+ * @type Date
+ */
+ toDate: false,
+
+ /**
+ * An array with two components: The first is the unit of the step (day, month, year, etc). The second one is the number of units for the step (1, 2, etc.).
+ * Default's [Ext.Date.DAY, 1].
+ *
+ * @property step
+ * @type Array
+ */
+ step: [Ext.Date.DAY, 1],
+
+ /**
+ * If true, the values of the chart will be rendered only if they belong between the fromDate and toDate.
+ * If false, the time axis will adapt to the new values by adding/removing steps.
+ * Default's [Ext.Date.DAY, 1].
+ *
+ * @property constrain
+ * @type Boolean
+ */
+ constrain: false,
+
+ // @private a wrapper for date methods.
+ dateMethods: {
+ 'year': function(date) {
+ return date.getFullYear();
+ },
+ 'month': function(date) {
+ return date.getMonth() + 1;
+ },
+ 'day': function(date) {
+ return date.getDate();
+ },
+ 'hour': function(date) {
+ return date.getHours();
+ },
+ 'minute': function(date) {
+ return date.getMinutes();
+ },
+ 'second': function(date) {
+ return date.getSeconds();
+ },
+ 'millisecond': function(date) {
+ return date.getMilliseconds();
+ }
+ },
+
+ // @private holds aggregate functions.
+ aggregateFn: (function() {
+ var etype = (function() {
+ var rgxp = /^\[object\s(.*)\]$/,
+ toString = Object.prototype.toString;
+ return function(e) {
+ return toString.call(e).match(rgxp)[1];
+ };
+ })();
+ return {
+ 'sum': function(list) {
+ var i = 0, l = list.length, acum = 0;
+ if (!list.length || etype(list[0]) != 'Number') {
+ return list[0];
+ }
+ for (; i < l; i++) {
+ acum += list[i];
+ }
+ return acum;
+ },
+ 'max': function(list) {
+ if (!list.length || etype(list[0]) != 'Number') {
+ return list[0];
+ }
+ return Math.max.apply(Math, list);
+ },
+ 'min': function(list) {
+ if (!list.length || etype(list[0]) != 'Number') {
+ return list[0];
+ }
+ return Math.min.apply(Math, list);
+ },
+ 'avg': function(list) {
+ var i = 0, l = list.length, acum = 0;
+ if (!list.length || etype(list[0]) != 'Number') {
+ return list[0];
+ }
+ for (; i < l; i++) {
+ acum += list[i];
+ }
+ return acum / l;
+ }
+ };
+ })(),
+
+ // @private normalized the store to fill date gaps in the time interval.
+ constrainDates: function() {
+ var fromDate = Ext.Date.clone(this.fromDate),
+ toDate = Ext.Date.clone(this.toDate),
+ step = this.step,
+ field = this.fields,
+ store = this.chart.store,
+ record, recObj, fieldNames = [],
+ newStore = Ext.create('Ext.data.Store', {
+ model: store.model
+ });
+
+ var getRecordByDate = (function() {
+ var index = 0, l = store.getCount();
+ return function(date) {
+ var rec, recDate;
+ for (; index < l; index++) {
+ rec = store.getAt(index);
+ recDate = rec.get(field);
+ if (+recDate > +date) {
+ return false;
+ } else if (+recDate == +date) {
+ return rec;
+ }
+ }
+ return false;
+ };
+ })();
+
+ if (!this.constrain) {
+ this.chart.filteredStore = this.chart.store;
+ return;
+ }
+
+ while(+fromDate <= +toDate) {
+ record = getRecordByDate(fromDate);
+ recObj = {};
+ if (record) {
+ newStore.add(record.data);
+ } else {
+ newStore.model.prototype.fields.each(function(f) {
+ recObj[f.name] = false;
+ });
+ recObj.date = fromDate;
+ newStore.add(recObj);
+ }
+ fromDate = Ext.Date.add(fromDate, step[0], step[1]);
+ }
+
+ this.chart.filteredStore = newStore;
+ },
+
+ // @private aggregates values if multiple store elements belong to the same time step.
+ aggregate: function() {
+ var aggStore = {},
+ aggKeys = [], key, value,
+ op = this.aggregateOp,
+ field = this.fields, i,
+ fields = this.groupBy.split(','),
+ curField,
+ recFields = [],
+ recFieldsLen = 0,
+ obj,
+ dates = [],
+ json = [],
+ l = fields.length,
+ dateMethods = this.dateMethods,
+ aggregateFn = this.aggregateFn,
+ store = this.chart.filteredStore || this.chart.store;
+
+ store.each(function(rec) {
+ //get all record field names in a simple array
+ if (!recFields.length) {
+ rec.fields.each(function(f) {
+ recFields.push(f.name);
+ });
+ recFieldsLen = recFields.length;
+ }
+ //get record date value
+ value = rec.get(field);
+ //generate key for grouping records
+ for (i = 0; i < l; i++) {
+ if (i == 0) {
+ key = String(dateMethods[fields[i]](value));
+ } else {
+ key += '||' + dateMethods[fields[i]](value);
+ }
+ }
+ //get aggregation record from hash
+ if (key in aggStore) {
+ obj = aggStore[key];
+ } else {
+ obj = aggStore[key] = {};
+ aggKeys.push(key);
+ dates.push(value);
+ }
+ //append record values to an aggregation record
+ for (i = 0; i < recFieldsLen; i++) {
+ curField = recFields[i];
+ if (!obj[curField]) {
+ obj[curField] = [];
+ }
+ if (rec.get(curField) !== undefined) {
+ obj[curField].push(rec.get(curField));
+ }
+ }
+ });
+ //perform aggregation operations on fields
+ for (key in aggStore) {
+ obj = aggStore[key];
+ for (i = 0; i < recFieldsLen; i++) {
+ curField = recFields[i];
+ obj[curField] = aggregateFn[op](obj[curField]);
+ }
+ json.push(obj);
+ }
+ this.chart.substore = Ext.create('Ext.data.JsonStore', {
+ fields: recFields,
+ data: json
+ });
+
+ this.dates = dates;
+ },
+
+ // @private creates a label array to be used as the axis labels.
+ setLabels: function() {
+ var store = this.chart.substore,
+ fields = this.fields,
+ format = this.dateFormat,
+ labels, i, dates = this.dates,
+ formatFn = Ext.Date.format;
+ this.labels = labels = [];
+ store.each(function(record, i) {
+ if (!format) {
+ labels.push(record.get(fields));
+ } else {
+ labels.push(formatFn(dates[i], format));
+ }
+ }, this);
+ },
+
+ processView: function() {
+ //TODO(nico): fix this eventually...
+ if (this.constrain) {
+ this.constrainDates();
+ this.aggregate();
+ this.chart.substore = this.chart.filteredStore;
+ } else {
+ this.aggregate();
+ }
+ },
+
+ // @private modifies the store and creates the labels for the axes.
+ applyData: function() {
+ this.setLabels();
+ var count = this.chart.substore.getCount();
+ return {
+ from: 0,
+ to: count,
+ steps: count - 1,
+ step: 1
+ };
+ }
+ });
+
+
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