/** Confirm that the equals method can distinguish all the required fields. */
  public void testEquals() {
    DialBackground b1 = new DialBackground();
    DialBackground b2 = new DialBackground();
    assertTrue(b1.equals(b2));

    // paint
    b1.setPaint(new GradientPaint(1.0f, 2.0f, Color.red, 3.0f, 4.0f, Color.yellow));
    assertFalse(b1.equals(b2));
    b2.setPaint(new GradientPaint(1.0f, 2.0f, Color.red, 3.0f, 4.0f, Color.yellow));
    assertTrue(b1.equals(b2));

    // gradient paint transformer
    b1.setGradientPaintTransformer(
        new StandardGradientPaintTransformer(GradientPaintTransformType.CENTER_VERTICAL));
    assertFalse(b1.equals(b2));
    b2.setGradientPaintTransformer(
        new StandardGradientPaintTransformer(GradientPaintTransformType.CENTER_VERTICAL));
    assertTrue(b1.equals(b2));

    // check an inherited attribute
    b1.setVisible(false);
    assertFalse(b1.equals(b2));
    b2.setVisible(false);
    assertTrue(b1.equals(b2));
  }
  /** Confirm that cloning works. */
  public void testCloning() {
    // test default instance
    DialBackground b1 = new DialBackground();
    DialBackground b2 = null;
    try {
      b2 = (DialBackground) b1.clone();
    } catch (CloneNotSupportedException e) {
      e.printStackTrace();
    }
    assertTrue(b1 != b2);
    assertTrue(b1.getClass() == b2.getClass());
    assertTrue(b1.equals(b2));

    // test a customised instance
    b1 = new DialBackground();
    b1.setPaint(new GradientPaint(1.0f, 2.0f, Color.red, 3.0f, 4.0f, Color.green));
    b1.setGradientPaintTransformer(
        new StandardGradientPaintTransformer(GradientPaintTransformType.CENTER_VERTICAL));
    b2 = null;
    try {
      b2 = (DialBackground) b1.clone();
    } catch (CloneNotSupportedException e) {
      e.printStackTrace();
    }
    assertTrue(b1 != b2);
    assertTrue(b1.getClass() == b2.getClass());
    assertTrue(b1.equals(b2));

    // check that the listener lists are independent
    MyDialLayerChangeListener l1 = new MyDialLayerChangeListener();
    b1.addChangeListener(l1);
    assertTrue(b1.hasListener(l1));
    assertFalse(b2.hasListener(l1));
  }
  protected void setDialBackground(ChartDocument chartDocument, DialPlot dialPlot) {
    ChartElement plotElement = getUniqueElement(chartDocument, ChartElement.TAG_NAME_PLOT);

    CSSValuePair cssValue =
        (CSSValuePair) plotElement.getLayoutStyle().getValue(ChartStyleKeys.GRADIENT_COLOR);
    Color beginColor = JFreeChartUtils.getColorFromCSSValue(cssValue.getFirstValue());
    Color endColor = JFreeChartUtils.getColorFromCSSValue(cssValue.getSecondValue());

    GradientPaint gradientpaint = new GradientPaint(new Point(), beginColor, new Point(), endColor);
    DialBackground dialbackground =
        new DialBackground(gradientpaint); // specify Color here for no gradient
    dialbackground.setGradientPaintTransformer(
        new StandardGradientPaintTransformer(GradientPaintTransformType.VERTICAL));
    dialPlot.setBackground(dialbackground);
  }
  /** Serialize an instance, restore it, and check for equality. */
  public void testSerialization() {
    // test a default instance
    DialBackground b1 = new DialBackground();
    DialBackground b2 = null;

    try {
      ByteArrayOutputStream buffer = new ByteArrayOutputStream();
      ObjectOutput out = new ObjectOutputStream(buffer);
      out.writeObject(b1);
      out.close();

      ObjectInput in = new ObjectInputStream(new ByteArrayInputStream(buffer.toByteArray()));
      b2 = (DialBackground) in.readObject();
      in.close();
    } catch (Exception e) {
      e.printStackTrace();
    }
    assertEquals(b1, b2);

    // test a customised instance
    b1 = new DialBackground();
    b1.setPaint(new GradientPaint(1.0f, 2.0f, Color.red, 3.0f, 4.0f, Color.green));
    b1.setGradientPaintTransformer(
        new StandardGradientPaintTransformer(GradientPaintTransformType.CENTER_VERTICAL));
    b2 = null;

    try {
      ByteArrayOutputStream buffer = new ByteArrayOutputStream();
      ObjectOutput out = new ObjectOutputStream(buffer);
      out.writeObject(b1);
      out.close();

      ObjectInput in = new ObjectInputStream(new ByteArrayInputStream(buffer.toByteArray()));
      b2 = (DialBackground) in.readObject();
      in.close();
    } catch (Exception e) {
      e.printStackTrace();
    }
    assertEquals(b1, b2);
  }