auto_tests/tests/simple_drawing.js

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  20
  21 /**
  22  * @fileoverview Test cases for drawing simple lines.
  23  *
  24  * @author konigsberg@google.com (Robert Konigsberg)
  25  */
  26 var ZERO_TO_FIFTY = [[ 10, 0 ] , [ 20, 50 ]];
  27
  28 var SimpleDrawingTestCase = TestCase("simple-drawing");
  29
  30 var _origFunc = Dygraph.getContext;
  31 SimpleDrawingTestCase.prototype.setUp = function() {
  32   document.body.innerHTML = "<div id='graph'></div>";
  33   Dygraph.getContext = function(canvas) {
  34     return new Proxy(_origFunc(canvas));
  35   }
  36 };
  37
  38 SimpleDrawingTestCase.prototype.tearDown = function() {
  39   Dygraph.getContext = _origFunc;
  40 };
  41
  42 SimpleDrawingTestCase.prototype.testDrawSimpleRangePlusOne = function() {
  43   var opts = {
  44     drawXGrid: false,
  45     drawYGrid: false,
  46     drawXAxis: false,
  47     drawYAxis: false,
  48     valueRange: [0,51] }
  49
  50   var graph = document.getElementById("graph");
  51   var g = new Dygraph(graph, ZERO_TO_FIFTY, opts);
  52   var htx = g.hidden_ctx_;
  53
  54   CanvasAssertions.assertLineDrawn(htx, [0,320], [475,6.2745], {
  55     strokeStyle: "#008080",
  56     lineWidth: 1
  57   });
  58   CanvasAssertions.assertBalancedSaveRestore(htx);
  59 };
  60
  61 SimpleDrawingTestCase.prototype.testDrawWithAxis = function() {
  62   var graph = document.getElementById("graph");
  63   var g = new Dygraph(graph, ZERO_TO_FIFTY);
  64
  65   var htx = g.hidden_ctx_;
  66   CanvasAssertions.assertBalancedSaveRestore(htx);
  67 };
  68
  69 /**
  70  * Tests that it is drawing dashes, and it remember the dash history between
  71  * points.
  72  */
  73 SimpleDrawingTestCase.prototype.testDrawSimpleDash = function() {
  74   var opts = {
  75       drawXGrid: false,
  76       drawYGrid: false,
  77       drawXAxis: false,
  78       drawYAxis: false,
  79       'Y1': {strokePattern: [25, 7, 7, 7]},
  80       colors: ['#ff0000']
  81   };
  82
  83   var graph = document.getElementById("graph");
  84   // Set the dims so we pass if default changes.
  85   graph.style.width='480px';
  86   graph.style.height='320px';
  87   var g = new Dygraph(graph, [[1, 4], [2, 5], [3, 3], [4, 7], [5, 9]], opts);
  88   htx = g.hidden_ctx_;
  89
  90   // TODO(danvk): figure out a good way to restore this test.
  91   // assertEquals(29, CanvasAssertions.numLinesDrawn(htx, "#ff0000"));
  92   CanvasAssertions.assertBalancedSaveRestore(htx);
  93 };