dygraph-gviz.js

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