1 'use strict';
  2 
  3 /**
  4  * @license
  5  * Copyright 2011 Dan Vanderkam (danvdk@gmail.com)
  6  * MIT-licenced: https://opensource.org/licenses/MIT
  7  */
  8 
  9 /**
 10  * @fileoverview A wrapper around the Dygraph class which implements the
 11  * interface for a GViz (aka Google Visualization API) visualization.
 12  * It is designed to be a drop-in replacement for Google's AnnotatedTimeline,
 13  * so the documentation at
 14  * http://code.google.com/apis/chart/interactive/docs/gallery/annotatedtimeline.html
 15  * translates over directly.
 16  *
 17  * For a full demo, see:
 18  * - http://dygraphs.com/tests/gviz.html
 19  * - http://dygraphs.com/tests/annotation-gviz.html
 20  */
 21 
 22 /*global Dygraph:false */
 23 
 24 import Dygraph from './dygraph';
 25 
 26 /**
 27  * A wrapper around Dygraph that implements the gviz API.
 28  * @param {!HTMLDivElement} container The DOM object the visualization should
 29  *     live in.
 30  * @constructor
 31  */
 32 var GVizChart = function(container) {
 33   this.container = container;
 34 };
 35 
 36 /**
 37  * @param {GVizDataTable} data
 38  * @param {Object.<*>} options
 39  */
 40 GVizChart.prototype.draw = function(data, options) {
 41   // Clear out any existing dygraph.
 42   // TODO(danvk): would it make more sense to simply redraw using the current
 43   // date_graph object?
 44   this.container.innerHTML = '';
 45   if (typeof(this.date_graph) != 'undefined') {
 46     this.date_graph.destroy();
 47   }
 48 
 49   this.date_graph = new Dygraph(this.container, data, options);
 50 };
 51 
 52 /**
 53  * Google charts compatible setSelection
 54  * Only row selection is supported, all points in the row will be highlighted
 55  * @param {Array.<{row:number}>} selection_array array of the selected cells
 56  * @public
 57  */
 58 GVizChart.prototype.setSelection = function(selection_array) {
 59   var row = false;
 60   if (selection_array.length) {
 61     row = selection_array[0].row;
 62   }
 63   this.date_graph.setSelection(row);
 64 };
 65 
 66 /**
 67  * Google charts compatible getSelection implementation
 68  * @return {Array.<{row:number,column:number}>} array of the selected cells
 69  * @public
 70  */
 71 GVizChart.prototype.getSelection = function() {
 72   var selection = [];
 73 
 74   var row = this.date_graph.getSelection();
 75 
 76   if (row < 0) return selection;
 77 
 78   var points = this.date_graph.layout_.points;
 79   for (var setIdx = 0; setIdx < points.length; ++setIdx) {
 80     selection.push({row: row, column: setIdx + 1});
 81   }
 82 
 83   return selection;
 84 };
 85 
 86 export default GVizChart;
 87