auto_tests/tests/simple_drawing.js

   1 // Copyright (c) 2011 Google, Inc.
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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 SimpleDrawingTestCase._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(SimpleDrawingTestCase._origFunc(canvas));
  35   }
  36 };
  37
  38 SimpleDrawingTestCase.prototype.tearDown = function() {
  39   Dygraph.getContext = SimpleDrawingTestCase._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 // See http://code.google.com/p/dygraphs/issues/detail?id=185
  62 SimpleDrawingTestCase.prototype.testDrawSimpleRangeZeroToFifty = function() {
  63   var opts = {
  64     drawXGrid: false,
  65     drawYGrid: false,
  66     drawXAxis: false,
  67     drawYAxis: false,
  68     valueRange: [0,50] }
  69
  70   var graph = document.getElementById("graph");
  71   var g = new Dygraph(graph, ZERO_TO_FIFTY, opts);
  72   var htx = g.hidden_ctx_;
  73
  74   var lines = CanvasAssertions.getLinesDrawn(htx, {
  75     strokeStyle: "#008080",
  76     lineWidth: 1
  77   });
  78   assertEquals(1, lines.length);
  79   CanvasAssertions.assertBalancedSaveRestore(htx);
  80 };
  81
  82 SimpleDrawingTestCase.prototype.testDrawWithAxis = function() {
  83   var graph = document.getElementById("graph");
  84   var g = new Dygraph(graph, ZERO_TO_FIFTY);
  85
  86   var htx = g.hidden_ctx_;
  87   CanvasAssertions.assertBalancedSaveRestore(htx);
  88 };
  89
  90 /**
  91  * Tests that it is drawing dashes, and it remember the dash history between
  92  * points.
  93  */
  94 SimpleDrawingTestCase.prototype.testDrawSimpleDash = function() {
  95   var opts = {
  96       drawXGrid: false,
  97       drawYGrid: false,
  98       drawXAxis: false,
  99       drawYAxis: false,
 100       'Y1': {strokePattern: [25, 7, 7, 7]},
 101       colors: ['#ff0000']
 102   };
 103
 104   var graph = document.getElementById("graph");
 105   // Set the dims so we pass if default changes.
 106   graph.style.width='480px';
 107   graph.style.height='320px';
 108   var g = new Dygraph(graph, [[1, 4], [2, 5], [3, 3], [4, 7], [5, 9]], opts);
 109   htx = g.hidden_ctx_;
 110
 111   // TODO(danvk): figure out a good way to restore this test.
 112   // assertEquals(29, CanvasAssertions.numLinesDrawn(htx, "#ff0000"));
 113   CanvasAssertions.assertBalancedSaveRestore(htx);
 114 };
 115
 116 /**
 117  * Tests that thick lines are drawn continuously.
 118  * Regression test for http://code.google.com/p/dygraphs/issues/detail?id=328
 119  */
 120 SimpleDrawingTestCase.prototype.testDrawThickLine = function() {
 121   var opts = {
 122     drawXGrid: false,
 123     drawYGrid: false,
 124     drawXAxis: false,
 125     drawYAxis: false,
 126     strokeWidth: 15,
 127     colors: ['#ff0000']
 128   };
 129
 130   var graph = document.getElementById("graph");
 131   // Set the dims so we pass if default changes.
 132   graph.style.width='480px';
 133   graph.style.height='320px';
 134   var g = new Dygraph(graph, [[1, 2], [2, 5], [3, 2], [4, 7], [5, 0]], opts);
 135   htx = g.hidden_ctx_;
 136
 137   // There's a big gap in the line at (2, 5)
 138   // If the bug is fixed, then there should be some red going up from here.
 139   var xy = g.toDomCoords(2, 5);
 140   var x = Math.round(xy[0]), y = Math.round(xy[1]);
 141
 142   var sampler = new PixelSampler(g);
 143   assertEquals([255,0,0,255], sampler.colorAtPixel(x, y));
 144   assertEquals([255,0,0,255], sampler.colorAtPixel(x, y - 1));
 145   assertEquals([255,0,0,255], sampler.colorAtPixel(x, y - 2));
 146
 147   // TODO(danvk): figure out a good way to restore this test.
 148   // assertEquals(29, CanvasAssertions.numLinesDrawn(htx, "#ff0000"));
 149   CanvasAssertions.assertBalancedSaveRestore(htx);
 150 };