--- /dev/null
+/**
+ * Synchronize zooming and/or selections between a set of dygraphs.
+ *
+ * Usage:
+ *
+ * var g1 = new Dygraph(...),
+ * g2 = new Dygraph(...),
+ * ...;
+ * var sync = Dygraph.synchronize(g1, g2, ...);
+ * // charts are now synchronized
+ * sync.detach();
+ * // charts are no longer synchronized
+ *
+ * You can set options using the last parameter, for example:
+ *
+ * var sync = Dygraph.synchronize(g1, g2, g3, {
+ * selection: true,
+ * zoom: true
+ * });
+ *
+ * The default is to synchronize both of these.
+ *
+ * Instead of passing one Dygraph object as each parameter, you may also pass an
+ * array of dygraphs:
+ *
+ * var sync = Dygraph.synchronize([g1, g2, g3], {
+ * selection: false,
+ * zoom: true
+ * });
+ *
+ * You may also set `range: false` if you wish to only sync the x-axis.
+ * The `range` option has no effect unless `zoom` is true (the default).
+ *
+ * SPDX-License-Identifier: MIT
+ * Original source: https://github.com/danvk/dygraphs/blob/master/src/extras/synchronizer.js
+ * at commit b55a71d768d2f8de62877c32b3aec9e9975ac389
+ *
+ * Copyright (c) 2009 Dan Vanderkam
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+(function() {
+/* global Dygraph:false */
+'use strict';
+
+var Dygraph;
+if (window.Dygraph) {
+ Dygraph = window.Dygraph;
+} else if (typeof(module) !== 'undefined') {
+ Dygraph = require('../dygraph');
+}
+
+var synchronize = function(/* dygraphs..., opts */) {
+ if (arguments.length === 0) {
+ throw 'Invalid invocation of Dygraph.synchronize(). Need >= 1 argument.';
+ }
+
+ var OPTIONS = ['selection', 'zoom', 'range'];
+ var opts = {
+ selection: true,
+ zoom: true,
+ range: true
+ };
+ var dygraphs = [];
+ var prevCallbacks = [];
+
+ var parseOpts = function(obj) {
+ if (!(obj instanceof Object)) {
+ throw 'Last argument must be either Dygraph or Object.';
+ } else {
+ for (var i = 0; i < OPTIONS.length; i++) {
+ var optName = OPTIONS[i];
+ if (obj.hasOwnProperty(optName)) opts[optName] = obj[optName];
+ }
+ }
+ };
+
+ if (arguments[0] instanceof Dygraph) {
+ // Arguments are Dygraph objects.
+ for (var i = 0; i < arguments.length; i++) {
+ if (arguments[i] instanceof Dygraph) {
+ dygraphs.push(arguments[i]);
+ } else {
+ break;
+ }
+ }
+ if (i < arguments.length - 1) {
+ throw 'Invalid invocation of Dygraph.synchronize(). ' +
+ 'All but the last argument must be Dygraph objects.';
+ } else if (i == arguments.length - 1) {
+ parseOpts(arguments[arguments.length - 1]);
+ }
+ } else if (arguments[0].length) {
+ // Invoked w/ list of dygraphs, options
+ for (var i = 0; i < arguments[0].length; i++) {
+ dygraphs.push(arguments[0][i]);
+ }
+ if (arguments.length == 2) {
+ parseOpts(arguments[1]);
+ } else if (arguments.length > 2) {
+ throw 'Invalid invocation of Dygraph.synchronize(). ' +
+ 'Expected two arguments: array and optional options argument.';
+ } // otherwise arguments.length == 1, which is fine.
+ } else {
+ throw 'Invalid invocation of Dygraph.synchronize(). ' +
+ 'First parameter must be either Dygraph or list of Dygraphs.';
+ }
+
+ if (dygraphs.length < 2) {
+ throw 'Invalid invocation of Dygraph.synchronize(). ' +
+ 'Need two or more dygraphs to synchronize.';
+ }
+
+ var readycount = dygraphs.length;
+ for (var i = 0; i < dygraphs.length; i++) {
+ var g = dygraphs[i];
+ g.ready( function() {
+ if (--readycount == 0) {
+ // store original callbacks
+ var callBackTypes = ['drawCallback', 'highlightCallback', 'unhighlightCallback'];
+ for (var j = 0; j < dygraphs.length; j++) {
+ if (!prevCallbacks[j]) {
+ prevCallbacks[j] = {};
+ }
+ for (var k = callBackTypes.length - 1; k >= 0; k--) {
+ prevCallbacks[j][callBackTypes[k]] = dygraphs[j].getFunctionOption(callBackTypes[k]);
+ }
+ }
+
+ // Listen for draw, highlight, unhighlight callbacks.
+ if (opts.zoom) {
+ attachZoomHandlers(dygraphs, opts, prevCallbacks);
+ }
+
+ if (opts.selection) {
+ attachSelectionHandlers(dygraphs, prevCallbacks);
+ }
+ }
+ });
+ }
+
+ return {
+ detach: function() {
+ for (var i = 0; i < dygraphs.length; i++) {
+ var g = dygraphs[i];
+ if (opts.zoom) {
+ g.updateOptions({drawCallback: prevCallbacks[i].drawCallback});
+ }
+ if (opts.selection) {
+ g.updateOptions({
+ highlightCallback: prevCallbacks[i].highlightCallback,
+ unhighlightCallback: prevCallbacks[i].unhighlightCallback
+ });
+ }
+ }
+ // release references & make subsequent calls throw.
+ dygraphs = null;
+ opts = null;
+ prevCallbacks = null;
+ }
+ };
+};
+
+function arraysAreEqual(a, b) {
+ if (!Array.isArray(a) || !Array.isArray(b)) return false;
+ var i = a.length;
+ if (i !== b.length) return false;
+ while (i--) {
+ if (a[i] !== b[i]) return false;
+ }
+ return true;
+}
+
+function attachZoomHandlers(gs, syncOpts, prevCallbacks) {
+ var block = false;
+ for (var i = 0; i < gs.length; i++) {
+ var g = gs[i];
+ g.updateOptions({
+ drawCallback: function(me, initial) {
+ if (block || initial) return;
+ block = true;
+ var opts = {
+ dateWindow: me.xAxisRange()
+ };
+ if (syncOpts.range) opts.valueRange = me.yAxisRange();
+
+ for (var j = 0; j < gs.length; j++) {
+ if (gs[j] == me) {
+ if (prevCallbacks[j] && prevCallbacks[j].drawCallback) {
+ prevCallbacks[j].drawCallback.apply(this, arguments);
+ }
+ continue;
+ }
+
+ // Only redraw if there are new options
+ if (arraysAreEqual(opts.dateWindow, gs[j].getOption('dateWindow')) &&
+ arraysAreEqual(opts.valueRange, gs[j].getOption('valueRange'))) {
+ continue;
+ }
+
+ gs[j].updateOptions(opts);
+ }
+ block = false;
+ }
+ }, true /* no need to redraw */);
+ }
+}
+
+function attachSelectionHandlers(gs, prevCallbacks) {
+ var block = false;
+ for (var i = 0; i < gs.length; i++) {
+ var g = gs[i];
+
+ g.updateOptions({
+ highlightCallback: function(event, x, points, row, seriesName) {
+ if (block) return;
+ block = true;
+ var me = this;
+ for (var i = 0; i < gs.length; i++) {
+ if (me == gs[i]) {
+ if (prevCallbacks[i] && prevCallbacks[i].highlightCallback) {
+ prevCallbacks[i].highlightCallback.apply(this, arguments);
+ }
+ continue;
+ }
+ var idx = gs[i].getRowForX(x);
+ if (idx !== null) {
+ gs[i].setSelection(idx, seriesName);
+ }
+ }
+ block = false;
+ },
+ unhighlightCallback: function(event) {
+ if (block) return;
+ block = true;
+ var me = this;
+ for (var i = 0; i < gs.length; i++) {
+ if (me == gs[i]) {
+ if (prevCallbacks[i] && prevCallbacks[i].unhighlightCallback) {
+ prevCallbacks[i].unhighlightCallback.apply(this, arguments);
+ }
+ continue;
+ }
+ gs[i].clearSelection();
+ }
+ block = false;
+ }
+ }, true /* no need to redraw */);
+ }
+}
+
+Dygraph.synchronize = synchronize;
+
+})();
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