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 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   g.destroy(); // to balance context saves and destroys.
  59   CanvasAssertions.assertBalancedSaveRestore(htx);
  60 };
  61
  62 // See http://code.google.com/p/dygraphs/issues/detail?id=185
  63 SimpleDrawingTestCase.prototype.testDrawSimpleRangeZeroToFifty = function() {
  64   var opts = {
  65     drawXGrid: false,
  66     drawYGrid: false,
  67     drawXAxis: false,
  68     drawYAxis: false,
  69     valueRange: [0,50] }
  70
  71   var graph = document.getElementById("graph");
  72   var g = new Dygraph(graph, ZERO_TO_FIFTY, opts);
  73   var htx = g.hidden_ctx_;
  74
  75   var lines = CanvasAssertions.getLinesDrawn(htx, {
  76     strokeStyle: "#008080",
  77     lineWidth: 1
  78   });
  79   assertEquals(1, lines.length);
  80   g.destroy(); // to balance context saves and destroys.
  81   CanvasAssertions.assertBalancedSaveRestore(htx);
  82 };
  83
  84 SimpleDrawingTestCase.prototype.testDrawWithAxis = function() {
  85   var graph = document.getElementById("graph");
  86   var g = new Dygraph(graph, ZERO_TO_FIFTY);
  87
  88   var htx = g.hidden_ctx_;
  89   g.destroy(); // to balance context saves and destroys.
  90   CanvasAssertions.assertBalancedSaveRestore(htx);
  91 };
  92
  93 /**
  94  * Tests that it is drawing dashes, and it remember the dash history between
  95  * points.
  96  */
  97 SimpleDrawingTestCase.prototype.testDrawSimpleDash = function() {
  98   var opts = {
  99     axes: {
 100       x: {
 101         drawGrid: false,
 102         drawAxis: false
 103       },
 104       y: {
 105         drawGrid: false,
 106         drawAxis: false
 107       }
 108     },
 109     series: {
 110       'Y1': {strokePattern: [25, 7, 7, 7]},
 111     },
 112     colors: ['#ff0000']
 113   };
 114
 115   var graph = document.getElementById("graph");
 116   // Set the dims so we pass if default changes.
 117   graph.style.width='480px';
 118   graph.style.height='320px';
 119   var g = new Dygraph(graph, [[1, 4], [2, 5], [3, 3], [4, 7], [5, 9]], opts);
 120   htx = g.hidden_ctx_;
 121
 122   // TODO(danvk): figure out a good way to restore this test.
 123   // assertEquals(29, CanvasAssertions.numLinesDrawn(htx, "#ff0000"));
 124   g.destroy(); // to balance context saves and destroys.
 125   CanvasAssertions.assertBalancedSaveRestore(htx);
 126 };
 127
 128 /**
 129  * Tests that thick lines are drawn continuously.
 130  * Regression test for http://code.google.com/p/dygraphs/issues/detail?id=328
 131  */
 132 SimpleDrawingTestCase.prototype.testDrawThickLine = function() {
 133   var opts = {
 134     drawXGrid: false,
 135     drawYGrid: false,
 136     drawXAxis: false,
 137     drawYAxis: false,
 138     strokeWidth: 15,
 139     colors: ['#ff0000']
 140   };
 141
 142   var graph = document.getElementById("graph");
 143   // Set the dims so we pass if default changes.
 144   graph.style.width='480px';
 145   graph.style.height='320px';
 146   var g = new Dygraph(graph, [[1, 2], [2, 5], [3, 2], [4, 7], [5, 0]], opts);
 147   htx = g.hidden_ctx_;
 148
 149   // There's a big gap in the line at (2, 5)
 150   // If the bug is fixed, then there should be some red going up from here.
 151   var xy = g.toDomCoords(2, 5);
 152   var x = Math.round(xy[0]), y = Math.round(xy[1]);
 153
 154   var sampler = new PixelSampler(g);
 155   assertEquals([255,0,0,255], sampler.colorAtPixel(x, y));
 156   assertEquals([255,0,0,255], sampler.colorAtPixel(x, y - 1));
 157   assertEquals([255,0,0,255], sampler.colorAtPixel(x, y - 2));
 158
 159   // TODO(danvk): figure out a good way to restore this test.
 160   // assertEquals(29, CanvasAssertions.numLinesDrawn(htx, "#ff0000"));
 161   g.destroy(); // to balance context saves and destroys.
 162   CanvasAssertions.assertBalancedSaveRestore(htx);
 163 };