Dygraph.SHORT_SPACINGS[Dygraph.DAILY] = 1000 * 86400;
Dygraph.SHORT_SPACINGS[Dygraph.WEEKLY] = 1000 * 604800;
+/**
+ * A collection of objects specifying where it is acceptable to place tick
+ * marks for granularities larger than WEEKLY.
+ * 'months' is an array of month indexes on which to place tick marks.
+ * 'year_mod' ticks are placed when year % year_mod = 0.
+ * @type {Array.<Object>}
+ */
+Dygraph.LONG_TICK_PLACEMENTS = [];
+Dygraph.LONG_TICK_PLACEMENTS[Dygraph.MONTHLY] = {
+ months : [0,1,2,3,4,5,6,7,8,9,10,11],
+ year_mod : 1
+};
+Dygraph.LONG_TICK_PLACEMENTS[Dygraph.QUARTERLY] = {
+ months: [0,3,6,9],
+ year_mod: 1
+};
+Dygraph.LONG_TICK_PLACEMENTS[Dygraph.BIANNUAL] = {
+ months: [0,6],
+ year_mod: 1
+};
+Dygraph.LONG_TICK_PLACEMENTS[Dygraph.ANNUAL] = {
+ months: [0],
+ year_mod: 1
+};
+Dygraph.LONG_TICK_PLACEMENTS[Dygraph.DECADAL] = {
+ months: [0],
+ year_mod: 10
+};
+Dygraph.LONG_TICK_PLACEMENTS[Dygraph.CENTENNIAL] = {
+ months: [0],
+ year_mod: 100
+};
+
/**
* This is a list of human-friendly values at which to show tick marks on a log
* scale. It is k * 10^n, where k=1..9 and n=-39..+39, so:
var spacing = Dygraph.SHORT_SPACINGS[granularity];
return Math.floor(0.5 + 1.0 * (end_time - start_time) / spacing);
} else {
- var year_mod = 1; // e.g. to only print one point every 10 years.
- var num_months = 12;
- if (granularity == Dygraph.QUARTERLY) num_months = 3;
- if (granularity == Dygraph.BIANNUAL) num_months = 2;
- if (granularity == Dygraph.ANNUAL) num_months = 1;
- if (granularity == Dygraph.DECADAL) { num_months = 1; year_mod = 10; }
- if (granularity == Dygraph.CENTENNIAL) { num_months = 1; year_mod = 100; }
+ var tickPlacement = Dygraph.LONG_TICK_PLACEMENTS[granularity];
var msInYear = 365.2524 * 24 * 3600 * 1000;
var num_years = 1.0 * (end_time - start_time) / msInYear;
- return Math.floor(0.5 + 1.0 * num_years * num_months / year_mod);
+ return Math.floor(0.5 + 1.0 * num_years * tickPlacement.months.length / tickPlacement.year_mod);
}
};
// for this granularity.
var g = spacing / 1000;
var d = new Date(start_time);
- d.setMilliseconds(0);
+ Dygraph.setDateSameTZ(d, {ms: 0});
+
var x;
if (g <= 60) { // seconds
- x = d.getSeconds(); d.setSeconds(x - x % g);
+ x = d.getSeconds();
+ Dygraph.setDateSameTZ(d, {s: x - x % g});
} else {
- d.setSeconds(0);
+ Dygraph.setDateSameTZ(d, {s: 0});
g /= 60;
if (g <= 60) { // minutes
- x = d.getMinutes(); d.setMinutes(x - x % g);
+ x = d.getMinutes();
+ Dygraph.setDateSameTZ(d, {m: x - x % g});
} else {
- d.setMinutes(0);
+ Dygraph.setDateSameTZ(d, {m: 0});
g /= 60;
if (g <= 24) { // days
- x = d.getHours(); d.setHours(x - x % g);
+ x = d.getHours();
+ d.setHours(x - x % g);
} else {
d.setHours(0);
g /= 24;
}
start_time = d.getTime();
+ // For spacings coarser than two-hourly, we want to ignore daylight
+ // savings transitions to get consistent ticks. For finer-grained ticks,
+ // it's essential to show the DST transition in all its messiness.
+ var start_offset_min = new Date(start_time).getTimezoneOffset();
+ var check_dst = (spacing >= Dygraph.SHORT_SPACINGS[Dygraph.TWO_HOURLY]);
+
for (t = start_time; t <= end_time; t += spacing) {
+ d = new Date(t);
+
+ // This ensures that we stay on the same hourly "rhythm" across
+ // daylight savings transitions. Without this, the ticks could get off
+ // by an hour. See tests/daylight-savings.html or issue 147.
+ if (check_dst && d.getTimezoneOffset() != start_offset_min) {
+ var delta_min = d.getTimezoneOffset() - start_offset_min;
+ t += delta_min * 60 * 1000;
+ d = new Date(t);
+ start_offset_min = d.getTimezoneOffset();
+
+ // Check whether we've backed into the previous timezone again.
+ // This can happen during a "spring forward" transition. In this case,
+ // it's best to skip this tick altogether (we may be shooting for a
+ // non-existent time like the 2AM that's skipped) and go to the next
+ // one.
+ if (new Date(t + spacing).getTimezoneOffset() != start_offset_min) {
+ t += spacing;
+ d = new Date(t);
+ start_offset_min = d.getTimezoneOffset();
+ }
+ }
+
ticks.push({ v:t,
- label: formatter(new Date(t), granularity, opts, dg)
+ label: formatter(d, granularity, opts, dg)
});
}
} else {
var months;
var year_mod = 1; // e.g. to only print one point every 10 years.
- if (granularity == Dygraph.MONTHLY) {
- months = [ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 ];
- } else if (granularity == Dygraph.QUARTERLY) {
- months = [ 0, 3, 6, 9 ];
- } else if (granularity == Dygraph.BIANNUAL) {
- months = [ 0, 6 ];
- } else if (granularity == Dygraph.ANNUAL) {
- months = [ 0 ];
- } else if (granularity == Dygraph.DECADAL) {
- months = [ 0 ];
- year_mod = 10;
- } else if (granularity == Dygraph.CENTENNIAL) {
- months = [ 0 ];
- year_mod = 100;
+ if (granularity < Dygraph.NUM_GRANULARITIES) {
+ months = Dygraph.LONG_TICK_PLACEMENTS[granularity].months;
+ year_mod = Dygraph.LONG_TICK_PLACEMENTS[granularity].year_mod;
} else {
Dygraph.warn("Span of dates is too long");
}
// These are set here so that this file can be included after dygraph.js
// or independently.
-Dygraph.DEFAULT_ATTRS = Dygraph.DEFAULT_ATTRS || {};
-Dygraph.DEFAULT_ATTRS['axes'] = Dygraph.DEFAULT_ATTRS['axes'] || {};
-Dygraph.DEFAULT_ATTRS['axes']['x'] = Dygraph.DEFAULT_ATTRS['axes']['x'] || {};
-Dygraph.DEFAULT_ATTRS['axes']['y'] = Dygraph.DEFAULT_ATTRS['axes']['y'] || {};
-Dygraph.DEFAULT_ATTRS['axes']['y2'] = Dygraph.DEFAULT_ATTRS['axes']['y2'] || {};
-Dygraph.DEFAULT_ATTRS['axes']['x']['ticker'] = Dygraph.dateTicker;
-Dygraph.DEFAULT_ATTRS['axes']['y']['ticker'] = Dygraph.numericTicks;
-Dygraph.DEFAULT_ATTRS['axes']['y2']['ticker'] = Dygraph.numericTicks;
+if (Dygraph &&
+ Dygraph.DEFAULT_ATTRS &&
+ Dygraph.DEFAULT_ATTRS['axes'] &&
+ Dygraph.DEFAULT_ATTRS['axes']['x'] &&
+ Dygraph.DEFAULT_ATTRS['axes']['y'] &&
+ Dygraph.DEFAULT_ATTRS['axes']['y2']) {
+ Dygraph.DEFAULT_ATTRS['axes']['x']['ticker'] = Dygraph.dateTicker;
+ Dygraph.DEFAULT_ATTRS['axes']['y']['ticker'] = Dygraph.numericTicks;
+ Dygraph.DEFAULT_ATTRS['axes']['y2']['ticker'] = Dygraph.numericTicks;
+}
projects / dygraphs.git / blobdiff