auto_tests/tests/fill_step_plot.js

   1 /**
   2  * @fileoverview Test if you give null values to dygraph with stepPlot
   3  * and fillGraph options enabled
   4  *
   5  * @author benoitboivin.pro@gmail.com (Benoit Boivin)
   6  */
   7 describe("fill-step-plot", function() {
   8
   9 beforeEach(function() {
  10   document.body.innerHTML = "<div id='graph'></div>";
  11 });
  12
  13 var origFunc = Dygraph.getContext;
  14
  15 beforeEach(function() {
  16   document.body.innerHTML = "<div id='graph'></div>";
  17   Dygraph.getContext = function(canvas) {
  18     return new Proxy(origFunc(canvas));
  19   };
  20 });
  21
  22 afterEach(function() {
  23   Dygraph.getContext = origFunc;
  24 });
  25
  26
  27 it('testFillStepPlotNullValues', function() {
  28   var opts = {
  29     labels: ["x","y"],
  30     width: 480,
  31     height: 320,
  32     fillGraph: true,
  33     stepPlot: true
  34   };
  35   var data = [
  36     [1,3],
  37     [2,0],
  38     [3,8],
  39     [4,null],
  40     [5,9],
  41     [6,8],
  42     [7,6],
  43     [8,3]
  44   ];
  45   var graph = document.getElementById("graph");
  46   var g = new Dygraph(graph, data, opts);
  47
  48   var htx = g.hidden_ctx_;
  49   var x1 = data[3][0];
  50   var y1 = data[2][1];
  51   var x2 = data[3][0];
  52   var y2 = 0;
  53   var xy1 = g.toDomCoords(x1, y1);
  54   var xy2 = g.toDomCoords(x2, y2);
  55
  56   // Check if a line is drawn between the previous y and the bottom of the chart
  57   CanvasAssertions.assertLineDrawn(htx, xy1, xy2, {});
  58 });
  59
  60 });