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-/**
- * @license
- * Copyright 2011 Dan Vanderkam (danvdk@gmail.com)
- * MIT-licensed (http://opensource.org/licenses/MIT)
- */
-
-/**
- * @fileoverview Description of this file.
- * @author danvk@google.com (Dan Vanderkam)
- *
- * A ticker is a function with the following interface:
- *
- * function(a, b, pixels, options_view, dygraph, forced_values);
- * -> [ { v: tick1_v, label: tick1_label[, label_v: label_v1] },
- * { v: tick2_v, label: tick2_label[, label_v: label_v2] },
- * ...
- * ]
- *
- * The returned value is called a "tick list".
- *
- * Arguments
- * ---------
- *
- * [a, b] is the range of the axis for which ticks are being generated. For a
- * numeric axis, these will simply be numbers. For a date axis, these will be
- * millis since epoch (convertable to Date objects using "new Date(a)" and "new
- * Date(b)").
- *
- * opts provides access to chart- and axis-specific options. It can be used to
- * access number/date formatting code/options, check for a log scale, etc.
- *
- * pixels is the length of the axis in pixels. opts('pixelsPerLabel') is the
- * minimum amount of space to be allotted to each label. For instance, if
- * pixels=400 and opts('pixelsPerLabel')=40 then the ticker should return
- * between zero and ten (400/40) ticks.
- *
- * dygraph is the Dygraph object for which an axis is being constructed.
- *
- * forced_values is used for secondary y-axes. The tick positions are typically
- * set by the primary y-axis, so the secondary y-axis has no choice in where to
- * put these. It simply has to generate labels for these data values.
- *
- * Tick lists
- * ----------
- * Typically a tick will have both a grid/tick line and a label at one end of
- * that line (at the bottom for an x-axis, at left or right for the y-axis).
- *
- * A tick may be missing one of these two components:
- * - If "label_v" is specified instead of "v", then there will be no tick or
- * gridline, just a label.
- * - Similarly, if "label" is not specified, then there will be a gridline
- * without a label.
- *
- * This flexibility is useful in a few situations:
- * - For log scales, some of the tick lines may be too close to all have labels.
- * - For date scales where years are being displayed, it is desirable to display
- * tick marks at the beginnings of years but labels (e.g. "2006") in the
- * middle of the years.
- */
-
-/*jshint globalstrict:true, sub:true */
-/*global Dygraph:false */
-"use strict";
-
-/** @typedef {Array.<{v:number, label:string, label_v:(string|undefined)}>} */
-Dygraph.TickList = undefined; // the ' = undefined' keeps jshint happy.
-
-/** @typedef {function(
- * number,
- * number,
- * number,
- * function(string):*,
- * Dygraph=,
- * Array.<number>=
- * ): Dygraph.TickList}
- */
-Dygraph.Ticker = undefined; // the ' = undefined' keeps jshint happy.
-
-/** @type {Dygraph.Ticker} */
-Dygraph.numericLinearTicks = function(a, b, pixels, opts, dygraph, vals) {
- var nonLogscaleOpts = function(opt) {
- if (opt === 'logscale') return false;
- return opts(opt);
- };
- return Dygraph.numericTicks(a, b, pixels, nonLogscaleOpts, dygraph, vals);
-};
-
-/** @type {Dygraph.Ticker} */
-Dygraph.numericTicks = function(a, b, pixels, opts, dygraph, vals) {
- var pixels_per_tick = /** @type{number} */(opts('pixelsPerLabel'));
- var ticks = [];
- var i, j, tickV, nTicks;
- if (vals) {
- for (i = 0; i < vals.length; i++) {
- ticks.push({v: vals[i]});
- }
- } else {
- // TODO(danvk): factor this log-scale block out into a separate function.
- if (opts("logscale")) {
- nTicks = Math.floor(pixels / pixels_per_tick);
- var minIdx = Dygraph.binarySearch(a, Dygraph.PREFERRED_LOG_TICK_VALUES, 1);
- var maxIdx = Dygraph.binarySearch(b, Dygraph.PREFERRED_LOG_TICK_VALUES, -1);
- if (minIdx == -1) {
- minIdx = 0;
- }
- if (maxIdx == -1) {
- maxIdx = Dygraph.PREFERRED_LOG_TICK_VALUES.length - 1;
- }
- // Count the number of tick values would appear, if we can get at least
- // nTicks / 4 accept them.
- var lastDisplayed = null;
- if (maxIdx - minIdx >= nTicks / 4) {
- for (var idx = maxIdx; idx >= minIdx; idx--) {
- var tickValue = Dygraph.PREFERRED_LOG_TICK_VALUES[idx];
- var pixel_coord = Math.log(tickValue / a) / Math.log(b / a) * pixels;
- var tick = { v: tickValue };
- if (lastDisplayed === null) {
- lastDisplayed = {
- tickValue : tickValue,
- pixel_coord : pixel_coord
- };
- } else {
- if (Math.abs(pixel_coord - lastDisplayed.pixel_coord) >= pixels_per_tick) {
- lastDisplayed = {
- tickValue : tickValue,
- pixel_coord : pixel_coord
- };
- } else {
- tick.label = "";
- }
- }
- ticks.push(tick);
- }
- // Since we went in backwards order.
- ticks.reverse();
- }
- }
-
- // ticks.length won't be 0 if the log scale function finds values to insert.
- if (ticks.length === 0) {
- // Basic idea:
- // Try labels every 1, 2, 5, 10, 20, 50, 100, etc.
- // Calculate the resulting tick spacing (i.e. this.height_ / nTicks).
- // The first spacing greater than pixelsPerYLabel is what we use.
- // TODO(danvk): version that works on a log scale.
- var kmg2 = opts("labelsKMG2");
- var mults, base;
- if (kmg2) {
- mults = [1, 2, 4, 8, 16, 32, 64, 128, 256];
- base = 16;
- } else {
- mults = [1, 2, 5, 10, 20, 50, 100];
- base = 10;
- }
-
- // Get the maximum number of permitted ticks based on the
- // graph's pixel size and pixels_per_tick setting.
- var max_ticks = Math.ceil(pixels / pixels_per_tick);
-
- // Now calculate the data unit equivalent of this tick spacing.
- // Use abs() since graphs may have a reversed Y axis.
- var units_per_tick = Math.abs(b - a) / max_ticks;
-
- // Based on this, get a starting scale which is the largest
- // integer power of the chosen base (10 or 16) that still remains
- // below the requested pixels_per_tick spacing.
- var base_power = Math.floor(Math.log(units_per_tick) / Math.log(base));
- var base_scale = Math.pow(base, base_power);
-
- // Now try multiples of the starting scale until we find one
- // that results in tick marks spaced sufficiently far apart.
- // The "mults" array should cover the range 1 .. base^2 to
- // adjust for rounding and edge effects.
- var scale, low_val, high_val, spacing;
- for (j = 0; j < mults.length; j++) {
- scale = base_scale * mults[j];
- low_val = Math.floor(a / scale) * scale;
- high_val = Math.ceil(b / scale) * scale;
- nTicks = Math.abs(high_val - low_val) / scale;
- spacing = pixels / nTicks;
- if (spacing > pixels_per_tick) break;
- }
-
- // Construct the set of ticks.
- // Allow reverse y-axis if it's explicitly requested.
- if (low_val > high_val) scale *= -1;
- for (i = 0; i < nTicks; i++) {
- tickV = low_val + i * scale;
- ticks.push( {v: tickV} );
- }
- }
- }
-
- var formatter = /**@type{AxisLabelFormatter}*/(opts('axisLabelFormatter'));
-
- // Add labels to the ticks.
- for (i = 0; i < ticks.length; i++) {
- if (ticks[i].label !== undefined) continue; // Use current label.
- // TODO(danvk): set granularity to something appropriate here.
- ticks[i].label = formatter(ticks[i].v, 0, opts, dygraph);
- }
-
- return ticks;
-};
-
-
-/** @type {Dygraph.Ticker} */
-Dygraph.dateTicker = function(a, b, pixels, opts, dygraph, vals) {
- var chosen = Dygraph.pickDateTickGranularity(a, b, pixels, opts);
-
- if (chosen >= 0) {
- return Dygraph.getDateAxis(a, b, chosen, opts, dygraph);
- } else {
- // this can happen if self.width_ is zero.
- return [];
- }
-};
-
-// Time granularity enumeration
-// TODO(danvk): make this an @enum
-Dygraph.SECONDLY = 0;
-Dygraph.TWO_SECONDLY = 1;
-Dygraph.FIVE_SECONDLY = 2;
-Dygraph.TEN_SECONDLY = 3;
-Dygraph.THIRTY_SECONDLY = 4;
-Dygraph.MINUTELY = 5;
-Dygraph.TWO_MINUTELY = 6;
-Dygraph.FIVE_MINUTELY = 7;
-Dygraph.TEN_MINUTELY = 8;
-Dygraph.THIRTY_MINUTELY = 9;
-Dygraph.HOURLY = 10;
-Dygraph.TWO_HOURLY = 11;
-Dygraph.SIX_HOURLY = 12;
-Dygraph.DAILY = 13;
-Dygraph.WEEKLY = 14;
-Dygraph.MONTHLY = 15;
-Dygraph.QUARTERLY = 16;
-Dygraph.BIANNUAL = 17;
-Dygraph.ANNUAL = 18;
-Dygraph.DECADAL = 19;
-Dygraph.CENTENNIAL = 20;
-Dygraph.NUM_GRANULARITIES = 21;
-
-/** @type {Array.<number>} */
-Dygraph.SHORT_SPACINGS = [];
-Dygraph.SHORT_SPACINGS[Dygraph.SECONDLY] = 1000 * 1;
-Dygraph.SHORT_SPACINGS[Dygraph.TWO_SECONDLY] = 1000 * 2;
-Dygraph.SHORT_SPACINGS[Dygraph.FIVE_SECONDLY] = 1000 * 5;
-Dygraph.SHORT_SPACINGS[Dygraph.TEN_SECONDLY] = 1000 * 10;
-Dygraph.SHORT_SPACINGS[Dygraph.THIRTY_SECONDLY] = 1000 * 30;
-Dygraph.SHORT_SPACINGS[Dygraph.MINUTELY] = 1000 * 60;
-Dygraph.SHORT_SPACINGS[Dygraph.TWO_MINUTELY] = 1000 * 60 * 2;
-Dygraph.SHORT_SPACINGS[Dygraph.FIVE_MINUTELY] = 1000 * 60 * 5;
-Dygraph.SHORT_SPACINGS[Dygraph.TEN_MINUTELY] = 1000 * 60 * 10;
-Dygraph.SHORT_SPACINGS[Dygraph.THIRTY_MINUTELY] = 1000 * 60 * 30;
-Dygraph.SHORT_SPACINGS[Dygraph.HOURLY] = 1000 * 3600;
-Dygraph.SHORT_SPACINGS[Dygraph.TWO_HOURLY] = 1000 * 3600 * 2;
-Dygraph.SHORT_SPACINGS[Dygraph.SIX_HOURLY] = 1000 * 3600 * 6;
-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:
- * ..., 1, 2, 3, 4, 5, ..., 9, 10, 20, 30, ..., 90, 100, 200, 300, ...
- * NOTE: this assumes that Dygraph.LOG_SCALE = 10.
- * @type {Array.<number>}
- */
-Dygraph.PREFERRED_LOG_TICK_VALUES = function() {
- var vals = [];
- for (var power = -39; power <= 39; power++) {
- var range = Math.pow(10, power);
- for (var mult = 1; mult <= 9; mult++) {
- var val = range * mult;
- vals.push(val);
- }
- }
- return vals;
-}();
-
-/**
- * Determine the correct granularity of ticks on a date axis.
- *
- * @param {number} a Left edge of the chart (ms)
- * @param {number} b Right edge of the chart (ms)
- * @param {number} pixels Size of the chart in the relevant dimension (width).
- * @param {function(string):*} opts Function mapping from option name ->
- * value.
- * @return {number} The appropriate axis granularity for this chart. See the
- * enumeration of possible values in dygraph-tickers.js.
- */
-Dygraph.pickDateTickGranularity = function(a, b, pixels, opts) {
- var pixels_per_tick = /** @type{number} */(opts('pixelsPerLabel'));
- for (var i = 0; i < Dygraph.NUM_GRANULARITIES; i++) {
- var num_ticks = Dygraph.numDateTicks(a, b, i);
- if (pixels / num_ticks >= pixels_per_tick) {
- return i;
- }
- }
- return -1;
-};
-
-/**
- * @param {number} start_time
- * @param {number} end_time
- * @param {number} granularity (one of the granularities enumerated above)
- * @return {number} Number of ticks that would result.
- */
-Dygraph.numDateTicks = function(start_time, end_time, granularity) {
- if (granularity < Dygraph.MONTHLY) {
- // Generate one tick mark for every fixed interval of time.
- var spacing = Dygraph.SHORT_SPACINGS[granularity];
- return Math.floor(0.5 + 1.0 * (end_time - start_time) / spacing);
- } else {
- 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 * tickPlacement.months.length / tickPlacement.year_mod);
- }
-};
-
-/**
- * @param {number} start_time
- * @param {number} end_time
- * @param {number} granularity (one of the granularities enumerated above)
- * @param {function(string):*} opts Function mapping from option name -&gt; value.
- * @param {Dygraph=} dg
- * @return {!Dygraph.TickList}
- */
-Dygraph.getDateAxis = function(start_time, end_time, granularity, opts, dg) {
- var formatter = /** @type{AxisLabelFormatter} */(
- opts("axisLabelFormatter"));
- var ticks = [];
- var t;
-
- if (granularity < Dygraph.MONTHLY) {
- // Generate one tick mark for every fixed interval of time.
- var spacing = Dygraph.SHORT_SPACINGS[granularity];
-
- // Find a time less than start_time which occurs on a "nice" time boundary
- // for this granularity.
- var g = spacing / 1000;
- var d = new Date(start_time);
- Dygraph.setDateSameTZ(d, {ms: 0});
-
- var x;
- if (g <= 60) { // seconds
- x = d.getSeconds();
- Dygraph.setDateSameTZ(d, {s: x - x % g});
- } else {
- Dygraph.setDateSameTZ(d, {s: 0});
- g /= 60;
- if (g <= 60) { // minutes
- x = d.getMinutes();
- Dygraph.setDateSameTZ(d, {m: x - x % g});
- } else {
- Dygraph.setDateSameTZ(d, {m: 0});
- g /= 60;
-
- if (g <= 24) { // days
- x = d.getHours();
- d.setHours(x - x % g);
- } else {
- d.setHours(0);
- g /= 24;
-
- if (g == 7) { // one week
- d.setDate(d.getDate() - d.getDay());
- }
- }
- }
- }
- 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(d, granularity, opts, dg)
- });
- }
- } else {
- // Display a tick mark on the first of a set of months of each year.
- // Years get a tick mark iff y % year_mod == 0. This is useful for
- // displaying a tick mark once every 10 years, say, on long time scales.
- var months;
- var year_mod = 1; // e.g. to only print one point every 10 years.
-
- 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");
- }
-
- var start_year = new Date(start_time).getFullYear();
- var end_year = new Date(end_time).getFullYear();
- var zeropad = Dygraph.zeropad;
- for (var i = start_year; i <= end_year; i++) {
- if (i % year_mod !== 0) continue;
- for (var j = 0; j < months.length; j++) {
- var date_str = i + "/" + zeropad(1 + months[j]) + "/01";
- t = Dygraph.dateStrToMillis(date_str);
- if (t < start_time || t > end_time) continue;
- ticks.push({ v:t,
- label: formatter(new Date(t), granularity, opts, dg)
- });
- }
- }
- }
-
- return ticks;
-};
-
-// These are set here so that this file can be included after dygraph.js
-// or independently.
-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;
-}