/** Check that the equals() method distinguishes all fields. */
  @Test
  public void testEquals() {
    XYAreaRenderer r1 = new XYAreaRenderer();
    XYAreaRenderer r2 = new XYAreaRenderer();
    assertEquals(r1, r2);

    r1 = new XYAreaRenderer(XYAreaRenderer.AREA_AND_SHAPES);
    assertFalse(r1.equals(r2));
    r2 = new XYAreaRenderer(XYAreaRenderer.AREA_AND_SHAPES);
    assertTrue(r1.equals(r2));

    r1 = new XYAreaRenderer(XYAreaRenderer.AREA);
    assertFalse(r1.equals(r2));
    r2 = new XYAreaRenderer(XYAreaRenderer.AREA);
    assertTrue(r1.equals(r2));

    r1 = new XYAreaRenderer(XYAreaRenderer.LINES);
    assertFalse(r1.equals(r2));
    r2 = new XYAreaRenderer(XYAreaRenderer.LINES);
    assertTrue(r1.equals(r2));

    r1 = new XYAreaRenderer(XYAreaRenderer.SHAPES);
    assertFalse(r1.equals(r2));
    r2 = new XYAreaRenderer(XYAreaRenderer.SHAPES);
    assertTrue(r1.equals(r2));

    r1 = new XYAreaRenderer(XYAreaRenderer.SHAPES_AND_LINES);
    assertFalse(r1.equals(r2));
    r2 = new XYAreaRenderer(XYAreaRenderer.SHAPES_AND_LINES);
    assertTrue(r1.equals(r2));

    r1.setOutline(true);
    assertFalse(r1.equals(r2));
    r2.setOutline(true);
    assertTrue(r1.equals(r2));

    r1.setLegendArea(new Rectangle2D.Double(1.0, 2.0, 3.0, 4.0));
    assertFalse(r1.equals(r2));
    r2.setLegendArea(new Rectangle2D.Double(1.0, 2.0, 3.0, 4.0));
    assertTrue(r1.equals(r2));

    r1.setUseFillPaint(true);
    assertFalse(r1.equals(r2));
    r2.setUseFillPaint(true);
    assertTrue(r1.equals(r2));

    r1.setGradientTransformer(
        new StandardGradientPaintTransformer(GradientPaintTransformType.CENTER_VERTICAL));
    assertFalse(r1.equals(r2));
    r2.setGradientTransformer(
        new StandardGradientPaintTransformer(GradientPaintTransformType.CENTER_VERTICAL));
    assertTrue(r1.equals(r2));
  }
  static JFreeChart createChart(
      NavigableMap<TimeAxisKey, DiffStat> aggregatedDiffstats,
      DiffStatConfiguration configuration) {

    boolean legend = false;
    boolean tooltips = false;
    boolean urls = false;
    Font helvetica = new Font("Helvetica", Font.PLAIN, 11 * configuration.multiplierInt());

    XYDatasetMinMax datasetMinMax =
        createDeltaDataset("Additions and Delections", aggregatedDiffstats);
    XYDataset dataset = datasetMinMax.dataset;
    JFreeChart chart =
        ChartFactory.createTimeSeriesChart("", "", "", dataset, legend, tooltips, urls);

    chart.setBackgroundPaint(WHITE);
    chart.setBorderVisible(false);

    float strokeWidth = 1.2f * configuration.multiplierFloat();

    XYPlot plot = chart.getXYPlot();
    plot.setOrientation(VERTICAL);
    plot.setBackgroundPaint(WHITE);
    plot.setDomainGridlinesVisible(true);
    plot.setDomainGridlinePaint(AXIS_LINE_COLOR);
    plot.setDomainGridlineStroke(new BasicStroke(1.0f * configuration.multiplierFloat()));
    plot.setRangeGridlinesVisible(false);

    plot.setOutlineVisible(false);

    DateAxis dateAxis = (DateAxis) plot.getDomainAxis();
    dateAxis.setDateFormatOverride(new SimpleDateFormat("MM/yy"));
    dateAxis.setTickLabelFont(helvetica);
    dateAxis.setAxisLineVisible(false);
    dateAxis.setTickUnit(computeDateTickUnit(aggregatedDiffstats));
    RectangleInsets insets =
        new RectangleInsets(
            8.0d * configuration.multiplierDouble(),
            4.0d * configuration.multiplierDouble(),
            4.0d * configuration.multiplierDouble(),
            4.0d * configuration.multiplierDouble());
    dateAxis.setTickLabelInsets(insets);

    NumberAxis additionDeletionAxis = (NumberAxis) plot.getRangeAxis(0);
    additionDeletionAxis.setAxisLineVisible(false);
    additionDeletionAxis.setLabel("Additions and Deletions");
    additionDeletionAxis.setLabelFont(helvetica);
    additionDeletionAxis.setTickLabelFont(helvetica);
    additionDeletionAxis.setRangeType(RangeType.FULL);
    int lowerBound = datasetMinMax.min + (int) (datasetMinMax.min * 0.1d);
    additionDeletionAxis.setLowerBound(lowerBound);
    int upperBound = datasetMinMax.max + (int) (datasetMinMax.max * 0.1d);
    additionDeletionAxis.setUpperBound(upperBound);
    additionDeletionAxis.setNumberFormatOverride(new AbbreviatingNumberFormat());
    additionDeletionAxis.setMinorTickMarksVisible(false);
    additionDeletionAxis.setTickMarkInsideLength(5.0f * configuration.multiplierFloat());
    additionDeletionAxis.setTickMarkOutsideLength(0.0f);
    additionDeletionAxis.setTickMarkStroke(new BasicStroke(2.0f * configuration.multiplierFloat()));
    additionDeletionAxis.setTickUnit(
        new NumberTickUnit(computeTickUnitSize(datasetMinMax.max + abs(datasetMinMax.min))));

    XYAreaRenderer areaRenderer = new XYAreaRenderer(XYAreaRenderer.AREA);
    areaRenderer.setOutline(true);
    areaRenderer.setSeriesOutlinePaint(0, ADDED_STROKE);
    areaRenderer.setSeriesOutlineStroke(0, new BasicStroke(strokeWidth));
    areaRenderer.setSeriesPaint(0, ADDED_FILL);
    areaRenderer.setSeriesOutlinePaint(1, REMOVED_STROKE);
    areaRenderer.setSeriesOutlineStroke(1, new BasicStroke(strokeWidth));
    areaRenderer.setSeriesPaint(1, REMOVED_FILL);
    plot.setRenderer(0, areaRenderer);

    // Total Axis
    NumberAxis totalAxis = new NumberAxis("Total Lines");
    totalAxis.setAxisLineVisible(false);
    totalAxis.setLabelPaint(VALUE_LABEL);
    totalAxis.setTickLabelPaint(TOTAL_LABEL);
    totalAxis.setLabelFont(helvetica);
    totalAxis.setTickLabelFont(helvetica);
    totalAxis.setNumberFormatOverride(new AbbreviatingNumberFormat());
    totalAxis.setMinorTickMarksVisible(false);
    totalAxis.setTickMarkInsideLength(5.0f * configuration.multiplierFloat());
    totalAxis.setTickMarkOutsideLength(0.0f);
    totalAxis.setTickMarkStroke(new BasicStroke(2.0f * configuration.multiplierFloat()));
    totalAxis.setTickMarkPaint(TOTAL_LABEL);
    plot.setRangeAxis(1, totalAxis);
    plot.setRangeAxisLocation(1, AxisLocation.BOTTOM_OR_RIGHT);

    XYDatasetAndTotal datasetAndTotal = createTotalDataset("Total Lines", aggregatedDiffstats);
    XYDataset totalDataSet = datasetAndTotal.dataset;
    plot.setDataset(1, totalDataSet);
    plot.mapDatasetToRangeAxis(1, 1);
    //        XYItemRenderer totalRenderer = new XYSplineRenderer();
    XYItemRenderer totalRenderer = new StandardXYItemRenderer();
    totalRenderer.setSeriesPaint(0, TOTAL_FILL);
    totalRenderer.setSeriesStroke(
        0,
        new BasicStroke(
            strokeWidth,
            CAP_ROUND,
            JOIN_ROUND,
            10.0f * configuration.multiplierFloat(),
            new float[] {
              6.0f * configuration.multiplierFloat(), 3.0f * configuration.multiplierFloat()
            },
            0.0f));
    plot.setRenderer(1, totalRenderer);

    totalAxis.setTickUnit(new NumberTickUnit(computeTickUnitSize(datasetAndTotal.total)));

    return chart;
  }