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 describe("simple-drawing", function() {
  29
  30 var _origFunc = Dygraph.getContext;
  31 beforeEach(function() {
  32   document.body.innerHTML = "<div id='graph'></div>";
  33   Dygraph.getContext = function(canvas) {
  34     return new Proxy(_origFunc(canvas));
  35   }
  36 });
  37
  38 afterEach(function() {
  39   Dygraph.getContext = _origFunc;
  40 });
  41
  42 it('testDrawSimpleRangePlusOne', function() {
  43   var opts = {
  44     axes : {
  45       x : {
  46         drawGrid: false,
  47         drawAxis: false,
  48       },
  49       y : {
  50         drawGrid: false,
  51         drawAxis: false,
  52       }
  53     },
  54     valueRange: [0,51] }
  55
  56   var graph = document.getElementById("graph");
  57   var g = new Dygraph(graph, ZERO_TO_FIFTY, opts);
  58   var htx = g.hidden_ctx_;
  59
  60   CanvasAssertions.assertLineDrawn(htx, [0,320], [475,6.2745], {
  61     strokeStyle: "#008080",
  62     lineWidth: 1
  63   });
  64   g.destroy(); // to balance context saves and destroys.
  65   CanvasAssertions.assertBalancedSaveRestore(htx);
  66 });
  67
  68 // See http://code.google.com/p/dygraphs/issues/detail?id=185
  69 it('testDrawSimpleRangeZeroToFifty', function() {
  70   var opts = {
  71     axes : {
  72       x : {
  73         drawGrid: false,
  74         drawAxis: false,
  75       },
  76       y : {
  77         drawGrid: false,
  78         drawAxis: false,
  79       }
  80     },
  81     valueRange: [0,50] }
  82
  83   var graph = document.getElementById("graph");
  84   var g = new Dygraph(graph, ZERO_TO_FIFTY, opts);
  85   var htx = g.hidden_ctx_;
  86
  87   var lines = CanvasAssertions.getLinesDrawn(htx, {
  88     strokeStyle: "#008080",
  89     lineWidth: 1
  90   });
  91   assert.equal(1, lines.length);
  92   g.destroy(); // to balance context saves and destroys.
  93   CanvasAssertions.assertBalancedSaveRestore(htx);
  94 });
  95
  96 it('testDrawWithAxis', function() {
  97   var graph = document.getElementById("graph");
  98   var g = new Dygraph(graph, ZERO_TO_FIFTY);
  99
 100   var htx = g.hidden_ctx_;
 101   g.destroy(); // to balance context saves and destroys.
 102   CanvasAssertions.assertBalancedSaveRestore(htx);
 103 });
 104
 105 /**
 106  * Tests that it is drawing dashes, and it remember the dash history between
 107  * points.
 108  */
 109 it('testDrawSimpleDash', function() {
 110   var opts = {
 111     axes: {
 112       x: {
 113         drawGrid: false,
 114         drawAxis: false
 115       },
 116       y: {
 117         drawGrid: false,
 118         drawAxis: false
 119       }
 120     },
 121     series: {
 122       'Y1': {strokePattern: [25, 7, 7, 7]},
 123     },
 124     colors: ['#ff0000']
 125   };
 126
 127   var graph = document.getElementById("graph");
 128   // Set the dims so we pass if default changes.
 129   graph.style.width='480px';
 130   graph.style.height='320px';
 131   var g = new Dygraph(graph, [[1, 4], [2, 5], [3, 3], [4, 7], [5, 9]], opts);
 132   var htx = g.hidden_ctx_;
 133
 134   // TODO(danvk): figure out a good way to restore this test.
 135   // assert.equal(29, CanvasAssertions.numLinesDrawn(htx, "#ff0000"));
 136   g.destroy(); // to balance context saves and destroys.
 137   CanvasAssertions.assertBalancedSaveRestore(htx);
 138 });
 139
 140 /**
 141  * Tests that thick lines are drawn continuously.
 142  * Regression test for http://code.google.com/p/dygraphs/issues/detail?id=328
 143  */
 144 it('testDrawThickLine', function() {
 145   var opts = {
 146     axes : {
 147       x : {
 148         drawGrid: false,
 149         drawAxis: false,
 150       },
 151       y : {
 152         drawGrid: false,
 153         drawAxis: false,
 154       }
 155     },
 156     strokeWidth: 15,
 157     colors: ['#ff0000']
 158   };
 159
 160   var graph = document.getElementById("graph");
 161   // Set the dims so we pass if default changes.
 162   graph.style.width='480px';
 163   graph.style.height='320px';
 164   var g = new Dygraph(graph, [[1, 2], [2, 5], [3, 2], [4, 7], [5, 0]], opts);
 165   var htx = g.hidden_ctx_;
 166
 167   // There's a big gap in the line at (2, 5)
 168   // If the bug is fixed, then there should be some red going up from here.
 169   var xy = g.toDomCoords(2, 5);
 170   var x = Math.round(xy[0]), y = Math.round(xy[1]);
 171
 172   var sampler = new PixelSampler(g);
 173   assert.deepEqual([255,0,0,255], sampler.colorAtPixel(x, y));
 174   assert.deepEqual([255,0,0,255], sampler.colorAtPixel(x, y - 1));
 175   assert.deepEqual([255,0,0,255], sampler.colorAtPixel(x, y - 2));
 176
 177   // TODO(danvk): figure out a good way to restore this test.
 178   // assert.equal(29, CanvasAssertions.numLinesDrawn(htx, "#ff0000"));
 179   g.destroy(); // to balance context saves and destroys.
 180   CanvasAssertions.assertBalancedSaveRestore(htx);
 181 });
 182
 183 });