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