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433 lines
12 KiB
JavaScript
433 lines
12 KiB
JavaScript
/* Pretty handling of time axes.
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Copyright (c) 2007-2014 IOLA and Ole Laursen.
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Licensed under the MIT license.
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Set axis.mode to "time" to enable. See the section "Time series data" in
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API.txt for details.
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*/
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(function($) {
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var options = {
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xaxis: {
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timezone: null, // "browser" for local to the client or timezone for timezone-js
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timeformat: null, // format string to use
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twelveHourClock: false, // 12 or 24 time in time mode
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monthNames: null // list of names of months
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}
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};
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// round to nearby lower multiple of base
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function floorInBase(n, base) {
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return base * Math.floor(n / base);
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}
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// Returns a string with the date d formatted according to fmt.
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// A subset of the Open Group's strftime format is supported.
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function formatDate(d, fmt, monthNames, dayNames) {
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if (typeof d.strftime == "function") {
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return d.strftime(fmt);
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}
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var leftPad = function(n, pad) {
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n = "" + n;
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pad = "" + (pad == null ? "0" : pad);
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return n.length == 1 ? pad + n : n;
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};
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var r = [];
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var escape = false;
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var hours = d.getHours();
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var isAM = hours < 12;
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if (monthNames == null) {
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monthNames = ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"];
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}
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if (dayNames == null) {
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dayNames = ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"];
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}
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var hours12;
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if (hours > 12) {
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hours12 = hours - 12;
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} else if (hours == 0) {
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hours12 = 12;
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} else {
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hours12 = hours;
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}
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for (var i = 0; i < fmt.length; ++i) {
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var c = fmt.charAt(i);
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if (escape) {
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switch (c) {
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case 'a': c = "" + dayNames[d.getDay()]; break;
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case 'b': c = "" + monthNames[d.getMonth()]; break;
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case 'd': c = leftPad(d.getDate()); break;
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case 'e': c = leftPad(d.getDate(), " "); break;
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case 'h': // For back-compat with 0.7; remove in 1.0
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case 'H': c = leftPad(hours); break;
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case 'I': c = leftPad(hours12); break;
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case 'l': c = leftPad(hours12, " "); break;
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case 'm': c = leftPad(d.getMonth() + 1); break;
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case 'M': c = leftPad(d.getMinutes()); break;
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// quarters not in Open Group's strftime specification
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case 'q':
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c = "" + (Math.floor(d.getMonth() / 3) + 1); break;
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case 'S': c = leftPad(d.getSeconds()); break;
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case 'y': c = leftPad(d.getFullYear() % 100); break;
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case 'Y': c = "" + d.getFullYear(); break;
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case 'p': c = (isAM) ? ("" + "am") : ("" + "pm"); break;
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case 'P': c = (isAM) ? ("" + "AM") : ("" + "PM"); break;
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case 'w': c = "" + d.getDay(); break;
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}
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r.push(c);
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escape = false;
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} else {
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if (c == "%") {
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escape = true;
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} else {
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r.push(c);
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}
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}
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}
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return r.join("");
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}
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// To have a consistent view of time-based data independent of which time
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// zone the client happens to be in we need a date-like object independent
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// of time zones. This is done through a wrapper that only calls the UTC
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// versions of the accessor methods.
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function makeUtcWrapper(d) {
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function addProxyMethod(sourceObj, sourceMethod, targetObj, targetMethod) {
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sourceObj[sourceMethod] = function() {
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return targetObj[targetMethod].apply(targetObj, arguments);
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};
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};
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var utc = {
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date: d
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};
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// support strftime, if found
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if (d.strftime != undefined) {
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addProxyMethod(utc, "strftime", d, "strftime");
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}
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addProxyMethod(utc, "getTime", d, "getTime");
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addProxyMethod(utc, "setTime", d, "setTime");
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var props = ["Date", "Day", "FullYear", "Hours", "Milliseconds", "Minutes", "Month", "Seconds"];
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for (var p = 0; p < props.length; p++) {
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addProxyMethod(utc, "get" + props[p], d, "getUTC" + props[p]);
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addProxyMethod(utc, "set" + props[p], d, "setUTC" + props[p]);
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}
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return utc;
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};
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// select time zone strategy. This returns a date-like object tied to the
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// desired timezone
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function dateGenerator(ts, opts) {
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if (opts.timezone == "browser") {
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return new Date(ts);
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} else if (!opts.timezone || opts.timezone == "utc") {
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return makeUtcWrapper(new Date(ts));
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} else if (typeof timezoneJS != "undefined" && typeof timezoneJS.Date != "undefined") {
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var d = new timezoneJS.Date();
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// timezone-js is fickle, so be sure to set the time zone before
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// setting the time.
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d.setTimezone(opts.timezone);
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d.setTime(ts);
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return d;
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} else {
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return makeUtcWrapper(new Date(ts));
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}
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}
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// map of app. size of time units in milliseconds
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var timeUnitSize = {
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"second": 1000,
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"minute": 60 * 1000,
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"hour": 60 * 60 * 1000,
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"day": 24 * 60 * 60 * 1000,
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"month": 30 * 24 * 60 * 60 * 1000,
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"quarter": 3 * 30 * 24 * 60 * 60 * 1000,
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"year": 365.2425 * 24 * 60 * 60 * 1000
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};
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// the allowed tick sizes, after 1 year we use
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// an integer algorithm
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var baseSpec = [
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[1, "second"], [2, "second"], [5, "second"], [10, "second"],
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[30, "second"],
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[1, "minute"], [2, "minute"], [5, "minute"], [10, "minute"],
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[30, "minute"],
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[1, "hour"], [2, "hour"], [4, "hour"],
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[8, "hour"], [12, "hour"],
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[1, "day"], [2, "day"], [3, "day"],
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[0.25, "month"], [0.5, "month"], [1, "month"],
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[2, "month"]
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];
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// we don't know which variant(s) we'll need yet, but generating both is
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// cheap
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var specMonths = baseSpec.concat([[3, "month"], [6, "month"],
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[1, "year"]]);
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var specQuarters = baseSpec.concat([[1, "quarter"], [2, "quarter"],
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[1, "year"]]);
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function init(plot) {
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plot.hooks.processOptions.push(function (plot, options) {
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$.each(plot.getAxes(), function(axisName, axis) {
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var opts = axis.options;
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if (opts.mode == "time") {
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axis.tickGenerator = function(axis) {
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var ticks = [];
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var d = dateGenerator(axis.min, opts);
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var minSize = 0;
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// make quarter use a possibility if quarters are
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// mentioned in either of these options
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var spec = (opts.tickSize && opts.tickSize[1] ===
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"quarter") ||
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(opts.minTickSize && opts.minTickSize[1] ===
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"quarter") ? specQuarters : specMonths;
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if (opts.minTickSize != null) {
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if (typeof opts.tickSize == "number") {
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minSize = opts.tickSize;
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} else {
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minSize = opts.minTickSize[0] * timeUnitSize[opts.minTickSize[1]];
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}
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}
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for (var i = 0; i < spec.length - 1; ++i) {
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if (axis.delta < (spec[i][0] * timeUnitSize[spec[i][1]]
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+ spec[i + 1][0] * timeUnitSize[spec[i + 1][1]]) / 2
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&& spec[i][0] * timeUnitSize[spec[i][1]] >= minSize) {
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break;
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}
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}
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var size = spec[i][0];
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var unit = spec[i][1];
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// special-case the possibility of several years
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if (unit == "year") {
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// if given a minTickSize in years, just use it,
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// ensuring that it's an integer
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if (opts.minTickSize != null && opts.minTickSize[1] == "year") {
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size = Math.floor(opts.minTickSize[0]);
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} else {
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var magn = Math.pow(10, Math.floor(Math.log(axis.delta / timeUnitSize.year) / Math.LN10));
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var norm = (axis.delta / timeUnitSize.year) / magn;
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if (norm < 1.5) {
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size = 1;
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} else if (norm < 3) {
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size = 2;
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} else if (norm < 7.5) {
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size = 5;
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} else {
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size = 10;
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}
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size *= magn;
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}
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// minimum size for years is 1
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if (size < 1) {
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size = 1;
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}
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}
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axis.tickSize = opts.tickSize || [size, unit];
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var tickSize = axis.tickSize[0];
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unit = axis.tickSize[1];
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var step = tickSize * timeUnitSize[unit];
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if (unit == "second") {
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d.setSeconds(floorInBase(d.getSeconds(), tickSize));
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} else if (unit == "minute") {
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d.setMinutes(floorInBase(d.getMinutes(), tickSize));
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} else if (unit == "hour") {
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d.setHours(floorInBase(d.getHours(), tickSize));
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} else if (unit == "month") {
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d.setMonth(floorInBase(d.getMonth(), tickSize));
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} else if (unit == "quarter") {
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d.setMonth(3 * floorInBase(d.getMonth() / 3,
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tickSize));
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} else if (unit == "year") {
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d.setFullYear(floorInBase(d.getFullYear(), tickSize));
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}
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// reset smaller components
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d.setMilliseconds(0);
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if (step >= timeUnitSize.minute) {
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d.setSeconds(0);
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}
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if (step >= timeUnitSize.hour) {
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d.setMinutes(0);
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}
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if (step >= timeUnitSize.day) {
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d.setHours(0);
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}
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if (step >= timeUnitSize.day * 4) {
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d.setDate(1);
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}
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if (step >= timeUnitSize.month * 2) {
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d.setMonth(floorInBase(d.getMonth(), 3));
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}
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if (step >= timeUnitSize.quarter * 2) {
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d.setMonth(floorInBase(d.getMonth(), 6));
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}
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if (step >= timeUnitSize.year) {
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d.setMonth(0);
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}
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var carry = 0;
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var v = Number.NaN;
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var prev;
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do {
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prev = v;
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v = d.getTime();
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ticks.push(v);
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if (unit == "month" || unit == "quarter") {
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if (tickSize < 1) {
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// a bit complicated - we'll divide the
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// month/quarter up but we need to take
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// care of fractions so we don't end up in
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// the middle of a day
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d.setDate(1);
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var start = d.getTime();
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d.setMonth(d.getMonth() +
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(unit == "quarter" ? 3 : 1));
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var end = d.getTime();
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d.setTime(v + carry * timeUnitSize.hour + (end - start) * tickSize);
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carry = d.getHours();
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d.setHours(0);
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} else {
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d.setMonth(d.getMonth() +
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tickSize * (unit == "quarter" ? 3 : 1));
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}
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} else if (unit == "year") {
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d.setFullYear(d.getFullYear() + tickSize);
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} else {
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d.setTime(v + step);
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}
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} while (v < axis.max && v != prev);
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return ticks;
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};
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axis.tickFormatter = function (v, axis) {
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var d = dateGenerator(v, axis.options);
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// first check global format
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if (opts.timeformat != null) {
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return formatDate(d, opts.timeformat, opts.monthNames, opts.dayNames);
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}
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// possibly use quarters if quarters are mentioned in
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// any of these places
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var useQuarters = (axis.options.tickSize &&
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axis.options.tickSize[1] == "quarter") ||
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(axis.options.minTickSize &&
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axis.options.minTickSize[1] == "quarter");
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var t = axis.tickSize[0] * timeUnitSize[axis.tickSize[1]];
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var span = axis.max - axis.min;
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var suffix = (opts.twelveHourClock) ? " %p" : "";
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var hourCode = (opts.twelveHourClock) ? "%I" : "%H";
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var fmt;
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if (t < timeUnitSize.minute) {
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fmt = hourCode + ":%M:%S" + suffix;
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} else if (t < timeUnitSize.day) {
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if (span < 2 * timeUnitSize.day) {
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fmt = hourCode + ":%M" + suffix;
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} else {
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fmt = "%b %d " + hourCode + ":%M" + suffix;
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}
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} else if (t < timeUnitSize.month) {
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fmt = "%b %d";
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} else if ((useQuarters && t < timeUnitSize.quarter) ||
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(!useQuarters && t < timeUnitSize.year)) {
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if (span < timeUnitSize.year) {
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fmt = "%b";
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} else {
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fmt = "%b %Y";
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}
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} else if (useQuarters && t < timeUnitSize.year) {
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if (span < timeUnitSize.year) {
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fmt = "Q%q";
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} else {
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fmt = "Q%q %Y";
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}
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} else {
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fmt = "%Y";
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}
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var rt = formatDate(d, fmt, opts.monthNames, opts.dayNames);
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return rt;
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};
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}
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});
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});
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}
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$.plot.plugins.push({
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init: init,
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options: options,
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name: 'time',
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version: '1.0'
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});
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// Time-axis support used to be in Flot core, which exposed the
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// formatDate function on the plot object. Various plugins depend
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// on the function, so we need to re-expose it here.
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$.plot.formatDate = formatDate;
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$.plot.dateGenerator = dateGenerator;
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})(jQuery);
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