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/* Pretty handling of time axes.
Copyright (c) 2007-2013 IOLA and Ole Laursen.
Licensed under the MIT license.
Set axis.mode to "time" to enable. See the section "Time series data" in
API.txt for details.
*/
(function($) {
var options = {
xaxis: {
timezone: null, // "browser" for local to the client or timezone for timezone-js
timeformat: null, // format string to use
twelveHourClock: false, // 12 or 24 time in time mode
monthNames: null // list of names of months
}
};
// round to nearby lower multiple of base
function floorInBase(n, base) {
return base * Math.floor(n / base);
}
// Returns a string with the date d formatted according to fmt.
// A subset of the Open Group's strftime format is supported.
function formatDate(d, fmt, monthNames, dayNames) {
if (typeof d.strftime == "function") {
return d.strftime(fmt);
}
var leftPad = function(n, pad) {
n = "" + n;
pad = "" + (pad == null ? "0" : pad);
return n.length == 1 ? pad + n : n;
};
var r = [];
var escape = false;
var hours = d.getHours();
var isAM = hours < 12;
if (monthNames == null) {
monthNames = ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"];
}
if (dayNames == null) {
dayNames = ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"];
}
var hours12;
if (hours > 12) {
hours12 = hours - 12;
} else if (hours == 0) {
hours12 = 12;
} else {
hours12 = hours;
}
for (var i = 0; i < fmt.length; ++i) {
var c = fmt.charAt(i);
if (escape) {
switch (c) {
case 'a': c = "" + dayNames[d.getDay()]; break;
case 'b': c = "" + monthNames[d.getMonth()]; break;
case 'd': c = leftPad(d.getDate()); break;
case 'e': c = leftPad(d.getDate(), " "); break;
case 'h': // For back-compat with 0.7; remove in 1.0
case 'H': c = leftPad(hours); break;
case 'I': c = leftPad(hours12); break;
case 'l': c = leftPad(hours12, " "); break;
case 'm': c = leftPad(d.getMonth() + 1); break;
case 'M': c = leftPad(d.getMinutes()); break;
// quarters not in Open Group's strftime specification
case 'q':
c = "" + (Math.floor(d.getMonth() / 3) + 1); break;
case 'S': c = leftPad(d.getSeconds()); break;
case 'y': c = leftPad(d.getFullYear() % 100); break;
case 'Y': c = "" + d.getFullYear(); break;
case 'p': c = (isAM) ? ("" + "am") : ("" + "pm"); break;
case 'P': c = (isAM) ? ("" + "AM") : ("" + "PM"); break;
case 'w': c = "" + d.getDay(); break;
}
r.push(c);
escape = false;
} else {
if (c == "%") {
escape = true;
} else {
r.push(c);
}
}
}
return r.join("");
}
// To have a consistent view of time-based data independent of which time
// zone the client happens to be in we need a date-like object independent
// of time zones. This is done through a wrapper that only calls the UTC
// versions of the accessor methods.
function makeUtcWrapper(d) {
function addProxyMethod(sourceObj, sourceMethod, targetObj, targetMethod) {
sourceObj[sourceMethod] = function() {
return targetObj[targetMethod].apply(targetObj, arguments);
};
};
var utc = {
date: d
};
// support strftime, if found
if (d.strftime != undefined) {
addProxyMethod(utc, "strftime", d, "strftime");
}
addProxyMethod(utc, "getTime", d, "getTime");
addProxyMethod(utc, "setTime", d, "setTime");
var props = ["Date", "Day", "FullYear", "Hours", "Milliseconds", "Minutes", "Month", "Seconds"];
for (var p = 0; p < props.length; p++) {
addProxyMethod(utc, "get" + props[p], d, "getUTC" + props[p]);
addProxyMethod(utc, "set" + props[p], d, "setUTC" + props[p]);
}
return utc;
};
// select time zone strategy. This returns a date-like object tied to the
// desired timezone
function dateGenerator(ts, opts) {
if (opts.timezone == "browser") {
return new Date(ts);
} else if (!opts.timezone || opts.timezone == "utc") {
return makeUtcWrapper(new Date(ts));
} else if (typeof timezoneJS != "undefined" && typeof timezoneJS.Date != "undefined") {
var d = new timezoneJS.Date();
// timezone-js is fickle, so be sure to set the time zone before
// setting the time.
d.setTimezone(opts.timezone);
d.setTime(ts);
return d;
} else {
return makeUtcWrapper(new Date(ts));
}
}
// map of app. size of time units in milliseconds
var timeUnitSize = {
"second": 1000,
"minute": 60 * 1000,
"hour": 60 * 60 * 1000,
"day": 24 * 60 * 60 * 1000,
"month": 30 * 24 * 60 * 60 * 1000,
"quarter": 3 * 30 * 24 * 60 * 60 * 1000,
"year": 365.2425 * 24 * 60 * 60 * 1000
};
// the allowed tick sizes, after 1 year we use
// an integer algorithm
var baseSpec = [
[1, "second"], [2, "second"], [5, "second"], [10, "second"],
[30, "second"],
[1, "minute"], [2, "minute"], [5, "minute"], [10, "minute"],
[30, "minute"],
[1, "hour"], [2, "hour"], [4, "hour"],
[8, "hour"], [12, "hour"],
[1, "day"], [2, "day"], [3, "day"],
[0.25, "month"], [0.5, "month"], [1, "month"],
[2, "month"]
];
// we don't know which variant(s) we'll need yet, but generating both is
// cheap
var specMonths = baseSpec.concat([[3, "month"], [6, "month"],
[1, "year"]]);
var specQuarters = baseSpec.concat([[1, "quarter"], [2, "quarter"],
[1, "year"]]);
function init(plot) {
plot.hooks.processOptions.push(function (plot, options) {
$.each(plot.getAxes(), function(axisName, axis) {
var opts = axis.options;
if (opts.mode == "time") {
axis.tickGenerator = function(axis) {
var ticks = [];
var d = dateGenerator(axis.min, opts);
var minSize = 0;
// make quarter use a possibility if quarters are
// mentioned in either of these options
var spec = (opts.tickSize && opts.tickSize[1] ===
"quarter") ||
(opts.minTickSize && opts.minTickSize[1] ===
"quarter") ? specQuarters : specMonths;
if (opts.minTickSize != null) {
if (typeof opts.tickSize == "number") {
minSize = opts.tickSize;
} else {
minSize = opts.minTickSize[0] * timeUnitSize[opts.minTickSize[1]];
}
}
for (var i = 0; i < spec.length - 1; ++i) {
if (axis.delta < (spec[i][0] * timeUnitSize[spec[i][1]]
+ spec[i + 1][0] * timeUnitSize[spec[i + 1][1]]) / 2
&& spec[i][0] * timeUnitSize[spec[i][1]] >= minSize) {
break;
}
}
var size = spec[i][0];
var unit = spec[i][1];
// special-case the possibility of several years
if (unit == "year") {
// if given a minTickSize in years, just use it,
// ensuring that it's an integer
if (opts.minTickSize != null && opts.minTickSize[1] == "year") {
size = Math.floor(opts.minTickSize[0]);
} else {
var magn = Math.pow(10, Math.floor(Math.log(axis.delta / timeUnitSize.year) / Math.LN10));
var norm = (axis.delta / timeUnitSize.year) / magn;
if (norm < 1.5) {
size = 1;
} else if (norm < 3) {
size = 2;
} else if (norm < 7.5) {
size = 5;
} else {
size = 10;
}
size *= magn;
}
// minimum size for years is 1
if (size < 1) {
size = 1;
}
}
axis.tickSize = opts.tickSize || [size, unit];
var tickSize = axis.tickSize[0];
unit = axis.tickSize[1];
var step = tickSize * timeUnitSize[unit];
if (unit == "second") {
d.setSeconds(floorInBase(d.getSeconds(), tickSize));
} else if (unit == "minute") {
d.setMinutes(floorInBase(d.getMinutes(), tickSize));
} else if (unit == "hour") {
d.setHours(floorInBase(d.getHours(), tickSize));
} else if (unit == "month") {
d.setMonth(floorInBase(d.getMonth(), tickSize));
} else if (unit == "quarter") {
d.setMonth(3 * floorInBase(d.getMonth() / 3,
tickSize));
} else if (unit == "year") {
d.setFullYear(floorInBase(d.getFullYear(), tickSize));
}
// reset smaller components
d.setMilliseconds(0);
if (step >= timeUnitSize.minute) {
d.setSeconds(0);
}
if (step >= timeUnitSize.hour) {
d.setMinutes(0);
}
if (step >= timeUnitSize.day) {
d.setHours(0);
}
if (step >= timeUnitSize.day * 4) {
d.setDate(1);
}
if (step >= timeUnitSize.month * 2) {
d.setMonth(floorInBase(d.getMonth(), 3));
}
if (step >= timeUnitSize.quarter * 2) {
d.setMonth(floorInBase(d.getMonth(), 6));
}
if (step >= timeUnitSize.year) {
d.setMonth(0);
}
var carry = 0;
var v = Number.NaN;
var prev;
do {
prev = v;
v = d.getTime();
ticks.push(v);
if (unit == "month" || unit == "quarter") {
if (tickSize < 1) {
// a bit complicated - we'll divide the
// month/quarter up but we need to take
// care of fractions so we don't end up in
// the middle of a day
d.setDate(1);
var start = d.getTime();
d.setMonth(d.getMonth() +
(unit == "quarter" ? 3 : 1));
var end = d.getTime();
d.setTime(v + carry * timeUnitSize.hour + (end - start) * tickSize);
carry = d.getHours();
d.setHours(0);
} else {
d.setMonth(d.getMonth() +
tickSize * (unit == "quarter" ? 3 : 1));
}
} else if (unit == "year") {
d.setFullYear(d.getFullYear() + tickSize);
} else {
d.setTime(v + step);
}
} while (v < axis.max && v != prev);
return ticks;
};
axis.tickFormatter = function (v, axis) {
var d = dateGenerator(v, axis.options);
// first check global format
if (opts.timeformat != null) {
return formatDate(d, opts.timeformat, opts.monthNames, opts.dayNames);
}
// possibly use quarters if quarters are mentioned in
// any of these places
var useQuarters = (axis.options.tickSize &&
axis.options.tickSize[1] == "quarter") ||
(axis.options.minTickSize &&
axis.options.minTickSize[1] == "quarter");
var t = axis.tickSize[0] * timeUnitSize[axis.tickSize[1]];
var span = axis.max - axis.min;
var suffix = (opts.twelveHourClock) ? " %p" : "";
var hourCode = (opts.twelveHourClock) ? "%I" : "%H";
var fmt;
if (t < timeUnitSize.minute) {
fmt = hourCode + ":%M:%S" + suffix;
} else if (t < timeUnitSize.day) {
if (span < 2 * timeUnitSize.day) {
fmt = hourCode + ":%M" + suffix;
} else {
fmt = "%b %d " + hourCode + ":%M" + suffix;
}
} else if (t < timeUnitSize.month) {
fmt = "%b %d";
} else if ((useQuarters && t < timeUnitSize.quarter) ||
(!useQuarters && t < timeUnitSize.year)) {
if (span < timeUnitSize.year) {
fmt = "%b";
} else {
fmt = "%b %Y";
}
} else if (useQuarters && t < timeUnitSize.year) {
if (span < timeUnitSize.year) {
fmt = "Q%q";
} else {
fmt = "Q%q %Y";
}
} else {
fmt = "%Y";
}
var rt = formatDate(d, fmt, opts.monthNames, opts.dayNames);
return rt;
};
}
});
});
}
$.plot.plugins.push({
init: init,
options: options,
name: 'time',
version: '1.0'
});
// Time-axis support used to be in Flot core, which exposed the
// formatDate function on the plot object. Various plugins depend
// on the function, so we need to re-expose it here.
$.plot.formatDate = formatDate;
})(jQuery);
