FEATURE: added test for issue #451

[dygraphs.git] / auto_tests / tests / connect_separated_points.js

/**\r
 * @fileoverview Test cases for the option "connectSeparatedPoints" especially for the scenario where not every series has a value for each timestamp.\r
 *\r
 * @author julian.eichstaedt@ch.sauter-bc.com (Fr. Sauter AG)\r
 */\r
var StepTestCase = TestCase("connect_separated_points");\r
\r
StepTestCase.prototype.setUp = function() {\r
  document.body.innerHTML = "<div id='graph'></div>";\r
};\r
\r
StepTestCase.origFunc = Dygraph.getContext;\r
\r
StepTestCase.prototype.setUp = function() {\r
  document.body.innerHTML = "<div id='graph'></div>";\r
  Dygraph.getContext = function(canvas) {\r
    return new Proxy(StepTestCase.origFunc(canvas));\r
  };\r
};\r
\r
StepTestCase.prototype.tearDown = function() {\r
  Dygraph.getContext = StepTestCase.origFunc;\r
};\r
\r
StepTestCase.prototype.testEdgePoints = function() {\r
  var opts = {\r
    width: 480,\r
    height: 320,\r
//    drawXGrid: false,\r
//    drawYGrid: false,\r
//    drawXAxis: false,\r
//    drawYAxis: false,\r
    errorBars: false,\r
    labels: ["x", "series1", "series2"],\r
    connectSeparatedPoints: true,\r
    dateWindow: [1.5,6.5]\r
  };\r
\r
  var data = [\r
              [0,0,2],\r
              [1,null,0.5],\r
              [2,0.5,1],\r
              [3,1,-1],\r
              [4,2,-2],\r
              [5,2.5,-2.5],\r
              [6,3,-3],\r
              [7,4,null],\r
              [8,4,-4],\r
             ];\r
\r
  var graph = document.getElementById("graph");\r
  var g = new Dygraph(graph, data, opts);\r
  \r
  htx = g.hidden_ctx_;\r
\r
  var attrs = {};  \r
\r
  //Test if series1 is drawn correctly.\r
  //------------------------------------\r
  \r
  // The first point of the first series\r
  var x1 = data[0][0];\r
  var y1 = data[0][1];\r
  var xy1 = g.toDomCoords(x1, y1);\r
  \r
  // The third (the second valid) point of the first series\r
  // This series has no value at the second position.\r
  var x2 = data[2][0];\r
  var y2 = data[2][1];\r
  var xy2 = g.toDomCoords(x2, y2);\r
  \r
  // Check if both points are connected at the left edge of the canvas and if the option "connectSeparatedPoints" works properly\r
  // even if the point is outside the visible range and only one series has a valid value for this point.\r
  CanvasAssertions.assertLineDrawn(htx, xy1, xy2, attrs);\r
\r
  //Test if series2 is drawn correctly.\r
  //------------------------------------\r
  \r
  // The sixth point of the second series\r
  // Use the sixth and NOT the seventh point despite this series has eight points \r
  // since this series has no value at the seventh position.\r
  var x1 = data[6][0];\r
  var y1 = data[6][2];\r
  var xy1 = g.toDomCoords(x1, y1);\r
  \r
  // The last point of the second series.\r
  var x2 = data[8][0];\r
  var y2 = data[8][2];\r
  var xy2 = g.toDomCoords(x2, y2);\r
  \r
  // Check if both points are connected at the right edge of the canvas and if the option "connectSeparatedPoints" works properly\r
  // even if the point is outside the visible range and only one series has a valid value for this point.\r
  CanvasAssertions.assertLineDrawn(htx, xy1, xy2, attrs);\r
\r
    \r
};\r