dygraph-gviz.js

   1 /**
   2  * @license
   3  * Copyright 2011 Dan Vanderkam (danvdk@gmail.com)
   4  * MIT-licensed (http://opensource.org/licenses/MIT)
   5  */
   6
   7 /**
   8  * @fileoverview A wrapper around the Dygraph class which implements the
   9  * interface for a GViz (aka Google Visualization API) visualization.
  10  * It is designed to be a drop-in replacement for Google's AnnotatedTimeline,
  11  * so the documentation at
  12  * http://code.google.com/apis/chart/interactive/docs/gallery/annotatedtimeline.html
  13  * translates over directly.
  14  *
  15  * For a full demo, see:
  16  * - http://dygraphs.com/tests/gviz.html
  17  * - http://dygraphs.com/tests/annotation-gviz.html
  18  */
  19
  20 /*jshint globalstrict: true */
  21 /*global Dygraph:false */
  22 "use strict";
  23
  24 /**
  25  * A wrapper around Dygraph that implements the gviz API.
  26  * @param {Object} container The DOM object the visualization should live in.
  27  */
  28 Dygraph.GVizChart = function(container) {
  29   this.container = container;
  30 };
  31
  32 Dygraph.GVizChart.prototype.draw = function(data, options) {
  33   // Clear out any existing dygraph.
  34   // TODO(danvk): would it make more sense to simply redraw using the current
  35   // date_graph object?
  36   this.container.innerHTML = '';
  37   if (typeof(this.date_graph) != 'undefined') {
  38     this.date_graph.destroy();
  39   }
  40
  41   this.date_graph = new Dygraph(this.container, data, options);
  42 };
  43
  44 /**
  45  * Google charts compatible setSelection
  46  * Only row selection is supported, all points in the row will be highlighted
  47  * @param {Array} array of the selected cells
  48  * @public
  49  */
  50 Dygraph.GVizChart.prototype.setSelection = function(selection_array) {
  51   var row = false;
  52   if (selection_array.length) {
  53     row = selection_array[0].row;
  54   }
  55   this.date_graph.setSelection(row);
  56 };
  57
  58 /**
  59  * Google charts compatible getSelection implementation
  60  * @return {Array} array of the selected cells
  61  * @public
  62  */
  63 Dygraph.GVizChart.prototype.getSelection = function() {
  64   var selection = [];
  65
  66   var row = this.date_graph.getSelection();
  67
  68   if (row < 0) return selection;
  69
  70   var datasets = this.date_graph.layout_.datasets;
  71   for (var setIdx = 0; setIdx < datasets.length; ++setIdx) {
  72     selection.push({row: row, column: setIdx + 1});
  73   }
  74
  75   return selection;
  76 };