src/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 (function() {
  21 /*global Dygraph:false */
  22 "use strict";
  23
  24 /**
  25  * A wrapper around Dygraph that implements the gviz API.
  26  * @param {!HTMLDivElement} container The DOM object the visualization should
  27  *     live in.
  28  * @constructor
  29  */
  30 Dygraph.GVizChart = function(container) {
  31   this.container = container;
  32 };
  33
  34 /**
  35  * @param {GVizDataTable} data
  36  * @param {Object.<*>} options
  37  */
  38 Dygraph.GVizChart.prototype.draw = function(data, options) {
  39   // Clear out any existing dygraph.
  40   // TODO(danvk): would it make more sense to simply redraw using the current
  41   // date_graph object?
  42   this.container.innerHTML = '';
  43   if (typeof(this.date_graph) != 'undefined') {
  44     this.date_graph.destroy();
  45   }
  46
  47   this.date_graph = new Dygraph(this.container, data, options);
  48 };
  49
  50 /**
  51  * Google charts compatible setSelection
  52  * Only row selection is supported, all points in the row will be highlighted
  53  * @param {Array.<{row:number}>} selection_array array of the selected cells
  54  * @public
  55  */
  56 Dygraph.GVizChart.prototype.setSelection = function(selection_array) {
  57   var row = false;
  58   if (selection_array.length) {
  59     row = selection_array[0].row;
  60   }
  61   this.date_graph.setSelection(row);
  62 };
  63
  64 /**
  65  * Google charts compatible getSelection implementation
  66  * @return {Array.<{row:number,column:number}>} array of the selected cells
  67  * @public
  68  */
  69 Dygraph.GVizChart.prototype.getSelection = function() {
  70   var selection = [];
  71
  72   var row = this.date_graph.getSelection();
  73
  74   if (row < 0) return selection;
  75
  76   var points = this.date_graph.layout_.points;
  77   for (var setIdx = 0; setIdx < points.length; ++setIdx) {
  78     selection.push({row: row, column: setIdx + 1});
  79   }
  80
  81   return selection;
  82 };
  83
  84 })();