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