| 1 | /** |
| 2 | * Synchronize zooming and/or selections between a set of dygraphs. |
| 3 | * |
| 4 | * Usage: |
| 5 | * |
| 6 | * var g1 = new Dygraph(...), |
| 7 | * g2 = new Dygraph(...), |
| 8 | * ...; |
| 9 | * var sync = Dygraph.synchronize(g1, g2, ...); |
| 10 | * // charts are now synchronized |
| 11 | * sync.detach(); |
| 12 | * // charts are no longer synchronized |
| 13 | * |
| 14 | * You can set options using the last parameter, for example: |
| 15 | * |
| 16 | * var sync = Dygraph.synchronize(g1, g2, g3, { |
| 17 | * selection: true, |
| 18 | * zoom: true |
| 19 | * }); |
| 20 | * |
| 21 | * The default is to synchronize both of these. |
| 22 | * |
| 23 | * Instead of passing one Dygraph objet as each parameter, you may also pass an |
| 24 | * array of dygraphs: |
| 25 | * |
| 26 | * var sync = Dygraph.synchronize([g1, g2, g3], { |
| 27 | * selection: false, |
| 28 | * zoom: true |
| 29 | * }); |
| 30 | */ |
| 31 | (function() { |
| 32 | /* global Dygraph:false */ |
| 33 | 'use strict'; |
| 34 | |
| 35 | Dygraph.synchronize = function(/* dygraphs..., opts */) { |
| 36 | if (arguments.length === 0) { |
| 37 | throw 'Invalid invocation of Dygraph.synchronize(). Need >= 1 argument.'; |
| 38 | } |
| 39 | |
| 40 | var OPTIONS = ['selection', 'zoom']; |
| 41 | var opts = { |
| 42 | selection: true, |
| 43 | zoom: true |
| 44 | }; |
| 45 | var dygraphs = []; |
| 46 | |
| 47 | var parseOpts = function(obj) { |
| 48 | if (!(obj instanceof Object)) { |
| 49 | throw 'Last argument must be either Dygraph or Object.'; |
| 50 | } else { |
| 51 | for (var i = 0; i < OPTIONS.length; i++) { |
| 52 | var optName = OPTIONS[i]; |
| 53 | if (obj.hasOwnProperty(optName)) opts[optName] = obj[optName]; |
| 54 | } |
| 55 | } |
| 56 | }; |
| 57 | |
| 58 | if (arguments[0] instanceof Dygraph) { |
| 59 | // Arguments are Dygraph objects. |
| 60 | for (var i = 0; i < arguments.length; i++) { |
| 61 | if (arguments[i] instanceof Dygraph) { |
| 62 | dygraphs.push(arguments[i]); |
| 63 | } else { |
| 64 | break; |
| 65 | } |
| 66 | } |
| 67 | if (i < arguments.length - 1) { |
| 68 | throw 'Invalid invocation of Dygraph.synchronize(). ' + |
| 69 | 'All but the last argument must be Dygraph objects.'; |
| 70 | } else if (i == arguments.length - 1) { |
| 71 | parseOpts(arguments[arguments.length - 1]); |
| 72 | } |
| 73 | } else if (arguments[0].length) { |
| 74 | // Invoked w/ list of dygraphs, options |
| 75 | for (var i = 0; i < arguments[0].length; i++) { |
| 76 | dygraphs.push(arguments[0][i]); |
| 77 | } |
| 78 | if (arguments.length == 2) { |
| 79 | parseOpts(arguments[1]); |
| 80 | } else if (arguments.length > 2) { |
| 81 | throw 'Invalid invocation of Dygraph.synchronize(). ' + |
| 82 | 'Expected two arguments: array and optional options argument.'; |
| 83 | } // otherwise arguments.length == 1, which is fine. |
| 84 | } else { |
| 85 | throw 'Invalid invocation of Dygraph.synchronize(). ' + |
| 86 | 'First parameter must be either Dygraph or list of Dygraphs.'; |
| 87 | } |
| 88 | |
| 89 | if (dygraphs.length < 2) { |
| 90 | throw 'Invalid invocation of Dygraph.synchronize(). ' + |
| 91 | 'Need two or more dygraphs to synchronize.'; |
| 92 | } |
| 93 | |
| 94 | // Listen for draw, highlight, unhighlight callbacks. |
| 95 | if (opts.zoom) { |
| 96 | attachZoomHandlers(dygraphs); |
| 97 | } |
| 98 | |
| 99 | if (opts.selection) { |
| 100 | attachSelectionHandlers(dygraphs); |
| 101 | } |
| 102 | |
| 103 | return { |
| 104 | detach: function() { |
| 105 | for (var i = 0; i < dygraphs.length; i++) { |
| 106 | var g = dygraphs[i]; |
| 107 | if (opts.zoom) { |
| 108 | g.updateOptions({drawCallback: null}); |
| 109 | } |
| 110 | if (opts.selection) { |
| 111 | g.updateOptions({ |
| 112 | highlightCallback: null, |
| 113 | unhighlightCallback: null |
| 114 | }); |
| 115 | } |
| 116 | } |
| 117 | // release references & make subsequent calls throw. |
| 118 | dygraphs = null; |
| 119 | opts = null; |
| 120 | } |
| 121 | }; |
| 122 | }; |
| 123 | |
| 124 | // TODO: call any `drawCallback`s that were set before this. |
| 125 | function attachZoomHandlers(gs) { |
| 126 | var block = false; |
| 127 | for (var i = 0; i < gs.length; i++) { |
| 128 | var g = gs[i]; |
| 129 | g.updateOptions({ |
| 130 | drawCallback: function(me, initial) { |
| 131 | if (block || initial) return; |
| 132 | block = true; |
| 133 | var range = me.xAxisRange(); |
| 134 | var yrange = me.yAxisRange(); |
| 135 | for (var j = 0; j < gs.length; j++) { |
| 136 | if (gs[j] == me) continue; |
| 137 | gs[j].updateOptions( { |
| 138 | dateWindow: range, |
| 139 | valueRange: yrange |
| 140 | }); |
| 141 | } |
| 142 | block = false; |
| 143 | } |
| 144 | }, false /* no need to redraw */); |
| 145 | } |
| 146 | } |
| 147 | |
| 148 | function attachSelectionHandlers(gs) { |
| 149 | var block = false; |
| 150 | for (var i = 0; i < gs.length; i++) { |
| 151 | var g = gs[i]; |
| 152 | g.updateOptions({ |
| 153 | highlightCallback: function(event, x, points, row, seriesName) { |
| 154 | if (block) return; |
| 155 | block = true; |
| 156 | var me = this; |
| 157 | for (var i = 0; i < gs.length; i++) { |
| 158 | if (me == gs[i]) continue; |
| 159 | var idx = dygraphsBinarySearch(gs[i], x); |
| 160 | if (idx !== null) { |
| 161 | gs[i].setSelection(idx, seriesName); |
| 162 | } |
| 163 | } |
| 164 | block = false; |
| 165 | }, |
| 166 | unhighlightCallback: function(event) { |
| 167 | if (block) return; |
| 168 | block = true; |
| 169 | var me = this; |
| 170 | for (var i = 0; i < gs.length; i++) { |
| 171 | if (me == gs[i]) continue; |
| 172 | gs[i].clearSelection(); |
| 173 | } |
| 174 | block = false; |
| 175 | } |
| 176 | }); |
| 177 | } |
| 178 | } |
| 179 | |
| 180 | // Returns the index corresponding to xVal, or null if there is none. |
| 181 | function dygraphsBinarySearch(g, xVal) { |
| 182 | var low = 0, |
| 183 | high = g.numRows() - 1; |
| 184 | |
| 185 | while (low < high) { |
| 186 | var idx = (high + low) >> 1; |
| 187 | var x = g.getValue(idx, 0); |
| 188 | if (x < xVal) { |
| 189 | low = idx + 1; |
| 190 | } else if (x > xVal) { |
| 191 | high = idx - 1; |
| 192 | } else { |
| 193 | return idx; |
| 194 | } |
| 195 | } |
| 196 | |
| 197 | // TODO: give an option to find the closest point, i.e. not demand an exact match. |
| 198 | return null; |
| 199 | } |
| 200 | |
| 201 | })(); |