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

/**
 * @fileoverview Tests using the "stackedGraph" option.
 *
 * @author dan@dygraphs.com (Dan Vanderkam)
 */
var stackedTestCase = TestCase("stacked");

stackedTestCase._origGetContext = Dygraph.getContext;

stackedTestCase.prototype.setUp = function() {
  document.body.innerHTML = "<div id='graph'></div>";
  Dygraph.getContext = function(canvas) {
    return new Proxy(stackedTestCase._origGetContext(canvas));
  }
};

stackedTestCase.prototype.tearDown = function() {
  Dygraph.getContext = stackedTestCase._origGetContext;
};

stackedTestCase.prototype.testCorrectColors = function() {
  var opts = {
    width: 400,
    height: 300,
    stackedGraph: true,
    axes : {
      x : {
        drawGrid: false,
        drawAxis: false,
      },
      y : {
        drawGrid: false,
        drawAxis: false,
      }
    },
    valueRange: [0, 3],
    colors: ['#00ff00', '#0000ff'],
    fillAlpha: 0.15
  };
  var data = "X,Y1,Y2\n" +
      "0,1,1\n" +
      "1,1,1\n" +
      "2,1,1\n" +
      "3,1,1\n"
  ;

  var graph = document.getElementById("graph");
  var g = new Dygraph(graph, data, opts);

  // y pixels 299-201 = y2 = transparent blue
  // y pixel 200 = y2 line (blue)
  // y pixels 199-101 = y1 = transparent green
  // y pixel 100 = y1 line (green)
  // y pixels 0-99 = nothing (white)

  // 38 = round(0.15 * 255)
  assertEquals([0, 0, 255, 38], Util.samplePixel(g.hidden_, 200, 250));
  assertEquals([0, 255, 0, 38], Util.samplePixel(g.hidden_, 200, 150));
};

// Regression test for http://code.google.com/p/dygraphs/issues/detail?id=358
stackedTestCase.prototype.testSelectionValues = function() {
  var opts = {
    stackedGraph: true
  };
  var data = "X,Y1,Y2\n" +
      "0,1,1\n" +
      "1,1,1\n" +
      "2,1,1\n" +
      "3,1,1\n"
  ;

  var graph = document.getElementById("graph");
  g = new Dygraph(graph, data, opts);

  g.setSelection(0);

  assertEquals("0: Y1: 1 Y2: 1", Util.getLegend());

  // Verify that the behavior is correct with highlightSeriesOpts as well.
  g.updateOptions({
    highlightSeriesOpts: {
      strokeWidth: 10
    }
  });
  g.setSelection(0);
  assertEquals("0: Y1: 1 Y2: 1", Util.getLegend());

  g.setSelection(1);
  assertEquals("1: Y1: 1 Y2: 1", Util.getLegend());

  g.setSelection(0, 'Y2');
  assertEquals("0: Y1: 1 Y2: 1", Util.getLegend());
};

// Regression test for http://code.google.com/p/dygraphs/issues/detail?id=176
stackedTestCase.prototype.testDuplicatedXValue = function() {
  var opts = {
    stackedGraph: true,
    fillAlpha: 0.15,
    colors: ['#00ff00'],
    width: 400,
    height: 300
  };
  var data = "X,Y1\n" +
      "0,1\n" +
      "1,1\n" +
      "2,1\n" +
      "2,1\n" +  // duplicate x-value!
      "3,1\n"
  ;

  var graph = document.getElementById("graph");
  g = new Dygraph(graph, data, opts);

  assert(g.yAxisRange()[1] < 2);

  assertEquals([0, 255, 0, 38], Util.samplePixel(g.hidden_, 200, 250));
  assertEquals([0, 255, 0, 38], Util.samplePixel(g.hidden_, 317, 250));
}

// Validates regression when null values in stacked graphs show up
// incorrectly in the legend.
stackedTestCase.prototype.testNullValues = function() {
  var opts = {
    stackedGraph: true,
    stepPlot:true
  };
  var data = "X,Y1,Y2,Y3\n" +
      "0,-5,-1,1\n" +
      "1,1,,1\n" +
      "2,1,2,3\n" +
      "3,3,,4\n" +
      "4,3,2,3\n"
  ;

  var graph = document.getElementById("graph");
  g = new Dygraph(graph, data, opts);

  g.setSelection(0);
  assertEquals("0: Y1: -5 Y2: -1 Y3: 1", Util.getLegend());

  g.setSelection(1);
  assertEquals("1: Y1: 1 Y3: 1", Util.getLegend());

  g.setSelection(2);
  assertEquals("2: Y1: 1 Y2: 2 Y3: 3", Util.getLegend());

  g.setSelection(3);
  assertEquals("3: Y1: 3 Y3: 4", Util.getLegend());

  g.setSelection(4);
  assertEquals("4: Y1: 3 Y2: 2 Y3: 3", Util.getLegend());
};

// Regression test for http://code.google.com/p/dygraphs/issues/detail?id=438
stackedTestCase.prototype.testMissingValueAtZero = function() {
  var opts = {
    stackedGraph: true
  };
  var data = "X,Y1,Y2\n" +
      "0,,1\n" +
      "1,1,2\n" +
      "2,,3\n"
  ;

  var graph = document.getElementById("graph");
  g = new Dygraph(graph, data, opts);

  g.setSelection(0);
  assertEquals("0: Y2: 1", Util.getLegend());

  g.setSelection(1);
  assertEquals("1: Y1: 1 Y2: 2", Util.getLegend());

  g.setSelection(2);
  assertEquals("2: Y2: 3", Util.getLegend());
};

stackedTestCase.prototype.testInterpolation = function() {
  var opts = {
    colors: ['#ff0000', '#00ff00', '#0000ff'],
    stackedGraph: true
  };

  // The last series is all-NaN, it ought to be treated as all zero
  // for stacking purposes.
  var N = NaN;
  var data = [
    [100, 1, 2, N, N],
    [101, 1, 2, 2, N],
    [102, 1, N, N, N],
    [103, 1, 2, 4, N],
    [104, N, N, N, N],
    [105, 1, 2, N, N],
    [106, 1, 2, 7, N],
    [107, 1, 2, 8, N],
    [108, 1, 2, 9, N],
    [109, 1, N, N, N]];

  var graph = document.getElementById("graph");
  g = new Dygraph(graph, data, opts);

  var htx = g.hidden_ctx_;
  var attrs = {};

  // Check that lines are drawn at the expected positions, using
  // interpolated values for missing data.
  CanvasAssertions.assertLineDrawn(
      htx, g.toDomCoords(100, 4), g.toDomCoords(101, 4), {strokeStyle: '#00ff00'});
  CanvasAssertions.assertLineDrawn(
      htx, g.toDomCoords(102, 6), g.toDomCoords(103, 7), {strokeStyle: '#ff0000'});
  CanvasAssertions.assertLineDrawn(
      htx, g.toDomCoords(107, 8), g.toDomCoords(108, 9), {strokeStyle: '#0000ff'});
  CanvasAssertions.assertLineDrawn(
      htx, g.toDomCoords(108, 12), g.toDomCoords(109, 12), {strokeStyle: '#ff0000'});

  // Check that the expected number of line segments gets drawn
  // for each series. Gaps don't get a line.
  assertEquals(7, CanvasAssertions.numLinesDrawn(htx, '#ff0000'));
  assertEquals(4, CanvasAssertions.numLinesDrawn(htx, '#00ff00'));
  assertEquals(2, CanvasAssertions.numLinesDrawn(htx, '#0000ff'));

  // Check that the selection returns the original (non-stacked)
  // values and skips gaps.
  g.setSelection(1);
  assertEquals("101: Y1: 1 Y2: 2 Y3: 2", Util.getLegend());

  g.setSelection(8);
  assertEquals("108: Y1: 1 Y2: 2 Y3: 9", Util.getLegend());

  g.setSelection(9);
  assertEquals("109: Y1: 1", Util.getLegend());
};

stackedTestCase.prototype.testInterpolationOptions = function() {
  var opts = {
    colors: ['#ff0000', '#00ff00', '#0000ff'],
    stackedGraph: true
  };

  var data = [
    [100, 1, NaN, 3],
    [101, 1, 2, 3],
    [102, 1, NaN, 3],
    [103, 1, 2, 3],
    [104, 1, NaN, 3]];

  var choices = ['all', 'inside', 'none'];
  var stackedY = [
    [6, 6, 6, 6, 6],
    [4, 6, 6, 6, 4],
    [4, 6, 4, 6, 4]];

  for (var i = 0; i < choices.length; ++i) {
    var graph = document.getElementById("graph");
    opts['stackedGraphNaNFill'] = choices[i];
    g = new Dygraph(graph, data, opts);

    var htx = g.hidden_ctx_;
    var attrs = {};

    // Check top lines get drawn at the expected positions.
    for (var j = 0; j < stackedY[i].length - 1; ++j) {
      CanvasAssertions.assertLineDrawn(
          htx,
          g.toDomCoords(100 + j, stackedY[i][j]),
          g.toDomCoords(101 + j, stackedY[i][j + 1]),
          {strokeStyle: '#ff0000'});
    }
  }
};

stackedTestCase.prototype.testMultiAxisInterpolation = function() {
  // Setting 2 axes to test that each axis stacks separately 
  var opts = {
    colors: ['#ff0000', '#00ff00', '#0000ff'],
    stackedGraph: true,
    series: {
        "Y1": {
            axis: 'y',
        },
        "Y2": {
            axis: 'y',
        },
        "Y3": {
            axis: 'y2',
        },
        "Y4": {
            axis: 'y2',
        }
    }
  };

  // The last series is all-NaN, it ought to be treated as all zero
  // for stacking purposes.
  var N = NaN;
  var data = [
    [100, 1, 2, N, N],
    [101, 1, 2, 2, N],
    [102, 1, N, N, N],
    [103, 1, 2, 4, N],
    [104, N, N, N, N],
    [105, 1, 2, N, N],
    [106, 1, 2, 7, N],
    [107, 1, 2, 8, N],
    [108, 1, 2, 9, N],
    [109, 1, N, N, N]];

  var graph = document.getElementById("graph");
  g = new Dygraph(graph, data, opts);

  var htx = g.hidden_ctx_;
  var attrs = {};

  // Check that lines are drawn at the expected positions, using
  // interpolated values for missing data.
  CanvasAssertions.assertLineDrawn(
      htx, g.toDomCoords(100, 2), g.toDomCoords(101, 2), {strokeStyle: '#00ff00'});
  CanvasAssertions.assertLineDrawn(
      htx, g.toDomCoords(102, 3), g.toDomCoords(103, 3), {strokeStyle: '#ff0000'});
  CanvasAssertions.assertLineDrawn(
      htx, g.toDomCoords(107, 2.71), g.toDomCoords(108, 3), {strokeStyle: '#0000ff'});
  CanvasAssertions.assertLineDrawn(
      htx, g.toDomCoords(108, 3), g.toDomCoords(109, 3), {strokeStyle: '#ff0000'});

  // Check that the expected number of line segments gets drawn
  // for each series. Gaps don't get a line.
  assertEquals(7, CanvasAssertions.numLinesDrawn(htx, '#ff0000'));
  assertEquals(4, CanvasAssertions.numLinesDrawn(htx, '#00ff00'));
  assertEquals(2, CanvasAssertions.numLinesDrawn(htx, '#0000ff'));

  // Check that the selection returns the original (non-stacked)
  // values and skips gaps.
  g.setSelection(1);
  assertEquals("101: Y1: 1 Y2: 2 Y3: 2", Util.getLegend());

  g.setSelection(8);
  assertEquals("108: Y1: 1 Y2: 2 Y3: 9", Util.getLegend());

  g.setSelection(9);
  assertEquals("109: Y1: 1", Util.getLegend());
};
Commit	Line	Data
890e2a37 DV	1	/**
	2	* @fileoverview Tests using the "stackedGraph" option.
	3	*
	4	* @author dan@dygraphs.com (Dan Vanderkam)
	5	*/
	6	var stackedTestCase = TestCase("stacked");
	7
30a5cfc6 KW	8	stackedTestCase._origGetContext = Dygraph.getContext;
30a5cfc6 KW	9
890e2a37 DV	10	stackedTestCase.prototype.setUp = function() {
890e2a37 DV	11	document.body.innerHTML = "<div id='graph'></div>";
30a5cfc6 KW	12	Dygraph.getContext = function(canvas) {
	13	return new Proxy(stackedTestCase._origGetContext(canvas));
	14	}
890e2a37 DV	15	};
	16
	17	stackedTestCase.prototype.tearDown = function() {
30a5cfc6	18	Dygraph.getContext = stackedTestCase._origGetContext;
890e2a37 DV	19	};
	20
	21	stackedTestCase.prototype.testCorrectColors = function() {
	22	var opts = {
	23	width: 400,
	24	height: 300,
	25	stackedGraph: true,
bfb3e0a4 RK	26	axes : {
	27	x : {
	28	drawGrid: false,
	29	drawAxis: false,
	30	},
	31	y : {
	32	drawGrid: false,
	33	drawAxis: false,
	34	}
	35	},
890e2a37 DV	36	valueRange: [0, 3],
	37	colors: ['#00ff00', '#0000ff'],
	38	fillAlpha: 0.15
	39	};
	40	var data = "X,Y1,Y2\n" +
	41	"0,1,1\n" +
	42	"1,1,1\n" +
	43	"2,1,1\n" +
	44	"3,1,1\n"
	45	;
	46
	47	var graph = document.getElementById("graph");
	48	var g = new Dygraph(graph, data, opts);
	49
	50	// y pixels 299-201 = y2 = transparent blue
	51	// y pixel 200 = y2 line (blue)
	52	// y pixels 199-101 = y1 = transparent green
	53	// y pixel 100 = y1 line (green)
	54	// y pixels 0-99 = nothing (white)
	55
890e2a37	56	// 38 = round(0.15 * 255)
37819481 PH	57	assertEquals([0, 0, 255, 38], Util.samplePixel(g.hidden_, 200, 250));
37819481 PH	58	assertEquals([0, 255, 0, 38], Util.samplePixel(g.hidden_, 200, 150));
890e2a37	59	};
9b3d9459 DV	60
	61	// Regression test for http://code.google.com/p/dygraphs/issues/detail?id=358
	62	stackedTestCase.prototype.testSelectionValues = function() {
	63	var opts = {
	64	stackedGraph: true
	65	};
	66	var data = "X,Y1,Y2\n" +
	67	"0,1,1\n" +
	68	"1,1,1\n" +
	69	"2,1,1\n" +
	70	"3,1,1\n"
	71	;
	72
	73	var graph = document.getElementById("graph");
	74	g = new Dygraph(graph, data, opts);
	75
	76	g.setSelection(0);
	77
79aabc9d	78	assertEquals("0: Y1: 1 Y2: 1", Util.getLegend());
9b3d9459 DV	79
	80	// Verify that the behavior is correct with highlightSeriesOpts as well.
	81	g.updateOptions({
	82	highlightSeriesOpts: {
	83	strokeWidth: 10
	84	}
	85	});
fa11f4e4 DV	86	g.setSelection(0);
	87	assertEquals("0: Y1: 1 Y2: 1", Util.getLegend());
	88
9b3d9459	89	g.setSelection(1);
79aabc9d	90	assertEquals("1: Y1: 1 Y2: 1", Util.getLegend());
9b3d9459 DV	91
9b3d9459 DV	92	g.setSelection(0, 'Y2');
79aabc9d	93	assertEquals("0: Y1: 1 Y2: 1", Util.getLegend());
9b3d9459	94	};
12b879f4 DV	95
	96	// Regression test for http://code.google.com/p/dygraphs/issues/detail?id=176
	97	stackedTestCase.prototype.testDuplicatedXValue = function() {
	98	var opts = {
	99	stackedGraph: true,
	100	fillAlpha: 0.15,
	101	colors: ['#00ff00'],
	102	width: 400,
	103	height: 300
	104	};
	105	var data = "X,Y1\n" +
	106	"0,1\n" +
	107	"1,1\n" +
	108	"2,1\n" +
	109	"2,1\n" + // duplicate x-value!
	110	"3,1\n"
	111	;
	112
	113	var graph = document.getElementById("graph");
	114	g = new Dygraph(graph, data, opts);
	115
	116	assert(g.yAxisRange()[1] < 2);
	117
	118	assertEquals([0, 255, 0, 38], Util.samplePixel(g.hidden_, 200, 250));
	119	assertEquals([0, 255, 0, 38], Util.samplePixel(g.hidden_, 317, 250));
	120	}
907121a8 VS	121
	122	// Validates regression when null values in stacked graphs show up
	123	// incorrectly in the legend.
	124	stackedTestCase.prototype.testNullValues = function() {
	125	var opts = {
	126	stackedGraph: true,
	127	stepPlot:true
	128	};
	129	var data = "X,Y1,Y2,Y3\n" +
	130	"0,-5,-1,1\n" +
	131	"1,1,,1\n" +
	132	"2,1,2,3\n" +
	133	"3,3,,4\n" +
	134	"4,3,2,3\n"
	135	;
	136
	137	var graph = document.getElementById("graph");
	138	g = new Dygraph(graph, data, opts);
	139
	140	g.setSelection(0);
	141	assertEquals("0: Y1: -5 Y2: -1 Y3: 1", Util.getLegend());
	142
	143	g.setSelection(1);
	144	assertEquals("1: Y1: 1 Y3: 1", Util.getLegend());
	145
	146	g.setSelection(2);
	147	assertEquals("2: Y1: 1 Y2: 2 Y3: 3", Util.getLegend());
	148
	149	g.setSelection(3);
	150	assertEquals("3: Y1: 3 Y3: 4", Util.getLegend());
	151
	152	g.setSelection(4);
	153	assertEquals("4: Y1: 3 Y2: 2 Y3: 3", Util.getLegend());
	154	};
cc87e270 VS	155
	156	// Regression test for http://code.google.com/p/dygraphs/issues/detail?id=438
	157	stackedTestCase.prototype.testMissingValueAtZero = function() {
	158	var opts = {
	159	stackedGraph: true
	160	};
	161	var data = "X,Y1,Y2\n" +
	162	"0,,1\n" +
	163	"1,1,2\n" +
	164	"2,,3\n"
	165	;
	166
	167	var graph = document.getElementById("graph");
	168	g = new Dygraph(graph, data, opts);
	169
	170	g.setSelection(0);
	171	assertEquals("0: Y2: 1", Util.getLegend());
	172
	173	g.setSelection(1);
	174	assertEquals("1: Y1: 1 Y2: 2", Util.getLegend());
	175
	176	g.setSelection(2);
	177	assertEquals("2: Y2: 3", Util.getLegend());
	178	};
30a5cfc6 KW	179
	180	stackedTestCase.prototype.testInterpolation = function() {
	181	var opts = {
	182	colors: ['#ff0000', '#00ff00', '#0000ff'],
	183	stackedGraph: true
	184	};
	185
	186	// The last series is all-NaN, it ought to be treated as all zero
	187	// for stacking purposes.
	188	var N = NaN;
	189	var data = [
	190	[100, 1, 2, N, N],
	191	[101, 1, 2, 2, N],
	192	[102, 1, N, N, N],
	193	[103, 1, 2, 4, N],
	194	[104, N, N, N, N],
	195	[105, 1, 2, N, N],
	196	[106, 1, 2, 7, N],
	197	[107, 1, 2, 8, N],
	198	[108, 1, 2, 9, N],
	199	[109, 1, N, N, N]];
	200
	201	var graph = document.getElementById("graph");
	202	g = new Dygraph(graph, data, opts);
	203
	204	var htx = g.hidden_ctx_;
	205	var attrs = {};
	206
	207	// Check that lines are drawn at the expected positions, using
	208	// interpolated values for missing data.
	209	CanvasAssertions.assertLineDrawn(
	210	htx, g.toDomCoords(100, 4), g.toDomCoords(101, 4), {strokeStyle: '#00ff00'});
	211	CanvasAssertions.assertLineDrawn(
	212	htx, g.toDomCoords(102, 6), g.toDomCoords(103, 7), {strokeStyle: '#ff0000'});
	213	CanvasAssertions.assertLineDrawn(
	214	htx, g.toDomCoords(107, 8), g.toDomCoords(108, 9), {strokeStyle: '#0000ff'});
	215	CanvasAssertions.assertLineDrawn(
	216	htx, g.toDomCoords(108, 12), g.toDomCoords(109, 12), {strokeStyle: '#ff0000'});
	217
	218	// Check that the expected number of line segments gets drawn
	219	// for each series. Gaps don't get a line.
	220	assertEquals(7, CanvasAssertions.numLinesDrawn(htx, '#ff0000'));
	221	assertEquals(4, CanvasAssertions.numLinesDrawn(htx, '#00ff00'));
	222	assertEquals(2, CanvasAssertions.numLinesDrawn(htx, '#0000ff'));
	223
	224	// Check that the selection returns the original (non-stacked)
	225	// values and skips gaps.
	226	g.setSelection(1);
	227	assertEquals("101: Y1: 1 Y2: 2 Y3: 2", Util.getLegend());
	228
	229	g.setSelection(8);
	230	assertEquals("108: Y1: 1 Y2: 2 Y3: 9", Util.getLegend());
	231
	232	g.setSelection(9);
	233	assertEquals("109: Y1: 1", Util.getLegend());
	234	};
	235
	236	stackedTestCase.prototype.testInterpolationOptions = function() {
	237	var opts = {
	238	colors: ['#ff0000', '#00ff00', '#0000ff'],
	239	stackedGraph: true
	240	};
	241
	242	var data = [
243	[100, 1, NaN, 3],
244	[101, 1, 2, 3],
245	[102, 1, NaN, 3],
246	[103, 1, 2, 3],
247	[104, 1, NaN, 3]];
248
249	var choices = ['all', 'inside', 'none'];
250	var stackedY = [
251	[6, 6, 6, 6, 6],
252	[4, 6, 6, 6, 4],
253	[4, 6, 4, 6, 4]];
254
255	for (var i = 0; i < choices.length; ++i) {
256	var graph = document.getElementById("graph");
257	opts['stackedGraphNaNFill'] = choices[i];
258	g = new Dygraph(graph, data, opts);
259
260	var htx = g.hidden_ctx_;
261	var attrs = {};
262
263	// Check top lines get drawn at the expected positions.
264	for (var j = 0; j < stackedY[i].length - 1; ++j) {
265	CanvasAssertions.assertLineDrawn(
266	htx,
267	g.toDomCoords(100 + j, stackedY[i][j]),
268	g.toDomCoords(101 + j, stackedY[i][j + 1]),
269	{strokeStyle: '#ff0000'});
270	}
271	}
272	};
0d087599 JJS	273
	274	stackedTestCase.prototype.testMultiAxisInterpolation = function() {
	275	// Setting 2 axes to test that each axis stacks separately
	276	var opts = {
	277	colors: ['#ff0000', '#00ff00', '#0000ff'],
	278	stackedGraph: true,
	279	series: {
	280	"Y1": {
	281	axis: 'y',
	282	},
	283	"Y2": {
	284	axis: 'y',
	285	},
	286	"Y3": {
	287	axis: 'y2',
	288	},
	289	"Y4": {
	290	axis: 'y2',
	291	}
	292	}
	293	};
	294
	295	// The last series is all-NaN, it ought to be treated as all zero
	296	// for stacking purposes.
	297	var N = NaN;
	298	var data = [
	299	[100, 1, 2, N, N],
	300	[101, 1, 2, 2, N],
	301	[102, 1, N, N, N],
	302	[103, 1, 2, 4, N],
	303	[104, N, N, N, N],
	304	[105, 1, 2, N, N],
	305	[106, 1, 2, 7, N],
	306	[107, 1, 2, 8, N],
	307	[108, 1, 2, 9, N],
	308	[109, 1, N, N, N]];
	309
	310	var graph = document.getElementById("graph");
	311	g = new Dygraph(graph, data, opts);
	312
	313	var htx = g.hidden_ctx_;
	314	var attrs = {};
	315
	316	// Check that lines are drawn at the expected positions, using
	317	// interpolated values for missing data.
	318	CanvasAssertions.assertLineDrawn(
	319	htx, g.toDomCoords(100, 2), g.toDomCoords(101, 2), {strokeStyle: '#00ff00'});
	320	CanvasAssertions.assertLineDrawn(
	321	htx, g.toDomCoords(102, 3), g.toDomCoords(103, 3), {strokeStyle: '#ff0000'});
	322	CanvasAssertions.assertLineDrawn(
	323	htx, g.toDomCoords(107, 2.71), g.toDomCoords(108, 3), {strokeStyle: '#0000ff'});
	324	CanvasAssertions.assertLineDrawn(
	325	htx, g.toDomCoords(108, 3), g.toDomCoords(109, 3), {strokeStyle: '#ff0000'});
	326
	327	// Check that the expected number of line segments gets drawn
	328	// for each series. Gaps don't get a line.
	329	assertEquals(7, CanvasAssertions.numLinesDrawn(htx, '#ff0000'));
	330	assertEquals(4, CanvasAssertions.numLinesDrawn(htx, '#00ff00'));
	331	assertEquals(2, CanvasAssertions.numLinesDrawn(htx, '#0000ff'));
	332
	333	// Check that the selection returns the original (non-stacked)
	334	// values and skips gaps.
	335	g.setSelection(1);
	336	assertEquals("101: Y1: 1 Y2: 2 Y3: 2", Util.getLegend());
337
338	g.setSelection(8);
339	assertEquals("108: Y1: 1 Y2: 2 Y3: 9", Util.getLegend());
340
341	g.setSelection(9);
342	assertEquals("109: Y1: 1", Util.getLegend());
343	};