+++ /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).
- */
-(function() {
-/* global Dygraph:false */
-'use strict';
-
-Dygraph.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 = {
- draw: null,
- highlight: null,
- unhighlight: null
- };
-
- 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) {
- // 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.draw});
- }
- if (opts.selection) {
- g.updateOptions({
- highlightCallback: prevCallbacks.highlight,
- unhighlightCallback: prevCallbacks.unhighlight
- });
- }
- }
- // release references & make subsequent calls throw.
- dygraphs = null;
- opts = null;
- prevCallbacks = null;
- }
- };
-};
-
-function attachZoomHandlers(gs, syncOpts, prevCallbacks) {
- var block = false;
- for (var i = 0; i < gs.length; i++) {
- var g = gs[i];
- prevCallbacks.draw = g.getFunctionOption('drawCallback');
- g.updateOptions({
- drawCallback: function(me, initial) {
- if (prevCallbacks.draw) prevCallbacks.draw(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) continue;
- gs[j].updateOptions(opts);
- }
- block = false;
- }
- }, false /* no need to redraw */);
- }
-}
-
-function attachSelectionHandlers(gs, prevCallbacks) {
- var block = false;
- for (var i = 0; i < gs.length; i++) {
- var g = gs[i];
- prevCallbacks.highlight = g.getFunctionOption('highlightCallback');
- prevCallbacks.unhighlight = g.getFunctionOption('unhighlightCallback');
- g.updateOptions({
- highlightCallback: function(event, x, points, row, seriesName) {
- if (prevCallbacks.highlight) {
- prevCallbacks.highlight(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]) continue;
- var idx = gs[i].getRowForX(x);
- if (idx !== null) {
- gs[i].setSelection(idx, seriesName);
- }
- }
- block = false;
- },
- unhighlightCallback: function(event) {
- if (prevCallbacks.unhighlight) prevCallbacks.unhighlight(event);
- if (block) return;
- block = true;
- var me = this;
- for (var i = 0; i < gs.length; i++) {
- if (me == gs[i]) continue;
- gs[i].clearSelection();
- }
- block = false;
- }
- });
- }
-}
-
-})();
projects / dygraphs.git / blobdiff