jfreechart：BarChart总标签定位问题？

Question

我正在使用以下代码将总标签定位在条形图的栏上。据推测，该位置位于每个渲染条的顶部。但是标签渲染的一些原因搞乱了整个图表！

更新定位总标签问题每个栏的总数应位于每个栏的顶部中心！相反，它位于靠近顶部的位置，而不是与条形对齐。

以下行有渲染图表标签的麻烦：

ItemLabelAnchor labelAnchor = "O".equals(direction) ? ItemLabelAnchor.OUTSIDE12 : ItemLabelAnchor.INSIDE8;
TextAnchor textAnchor = "O".equals(direction) ? TextAnchor.TOP_CENTER : TextAnchor.CENTER;
TextAnchor rotationAnchor = "O".equals(direction) ? TextAnchor.TOP_CENTER : TextAnchor.BOTTOM_CENTER;
renderer.setSeriesPositiveItemLabelPosition(0,
        new ItemLabelPosition(labelAnchor, textAnchor, rotationAnchor, ((angle * Math.PI) / 180)));

我正在使用jdk 8和jFreeChart-1.0.19。完整代码清单后：

CategoryPlot plot = chart.getCategoryPlot();

if (plot != null) {
if (log.isDebugEnabled()) {
    log.debug("Total Renderers : " + plot.getRendererCount());
}
try {
    JRPropertiesMap propMap = jasperChart.getPropertiesMap();
    if (propMap.containsProperty(APPLY_LABEL_ROTATION)) {
        DecimalFormat dfKey = new DecimalFormat("###,###");

       /* {0} - label would be equal to Series expression,
       * {1} - label would be equal to Category expression,
       * {2} - label would be equal to Value expression
       */
    StandardCategoryItemLabelGenerator labelGenerator = new    StandardCategoryItemLabelGenerator("{2}", dfKey);

LegendItemCollection lic = new LegendItemCollection();
List<LegendItem> legendList = new ArrayList<LegendItem>();
LegendItem totalOpenLegend = null;
for (int i = 0; i <= (plot.getRendererCount() - 1); i++) {

    String prop = propMap.getProperty("Chart_" + (i + 1));

    Double angle = null == prop ? 0D : Double.valueOf(prop.substring(0, prop.length() - 1));
    String direction = null == prop ? "O" : "" + prop.charAt(prop.length() - 1);
    if (log.isDebugEnabled()) {
        log.debug("Property value for renerer : " + i + " Chart_" + (i + 1) + "  angle : " + angle + ", Direction : " + direction);
    }

    CategoryItemRenderer renderer = plot.getRenderer(i);
    renderer.setBaseItemLabelsVisible(true);
    renderer.setBaseItemLabelGenerator(labelGenerator);

    if (i == 0) {
        Shape shape = ShapeUtilities.createLineRegion(new Line2D.Double(-6, 0, 6, 0), 1);
        ((LineAndShapeRenderer) renderer).setSeriesShape(0, shape);
        ((LineAndShapeRenderer) renderer).setBaseItemLabelsVisible(false);
    }

    if (i == 1) {
        //shape = ShapeUtilities.createLineRegion(new Line2D.Double(0, 0, 1, 1), 2);
        ((LineAndShapeRenderer) renderer).setBaseShapesFilled(false);
        ((LineAndShapeRenderer) renderer).setBaseItemLabelPaint(Color.RED);
    }

    if (i == 2) {
        ((LineAndShapeRenderer) renderer).setBaseItemLabelsVisible(false);
    }

    if (i == 3) {
        ((LineAndShapeRenderer) renderer).setBaseItemLabelPaint(new Color(139, 90, 43));
    }

    LegendItem item = renderer.getLegendItem(i, 0);

    if ((i >= 0) && (i < 4)) {
        legendList.add(item);
    } else {
        totalOpenLegend = item;
        BarRenderer barRenderer = (BarRenderer) renderer;
        barRenderer.setMaximumBarWidth(0.3);
        barRenderer.setItemMargin(0.1);
    }

    ItemLabelAnchor labelAnchor = "O".equals(direction) ? ItemLabelAnchor.OUTSIDE12 : ItemLabelAnchor.INSIDE8;
    TextAnchor textAnchor = "O".equals(direction) ? TextAnchor.TOP_CENTER : TextAnchor.CENTER;
    TextAnchor rotationAnchor = "O".equals(direction) ? TextAnchor.TOP_CENTER : TextAnchor.BOTTOM_CENTER;
    renderer.setSeriesPositiveItemLabelPosition(0,
            new ItemLabelPosition(labelAnchor, textAnchor, rotationAnchor, ((angle * Math.PI) / 180)));
    //--
    plot.setRenderer(i, renderer);
}

lic.add(totalOpenLegend);

for (LegendItem li : legendList) {
    lic.add(li);
}
System.out.println("Setting Legend Items");
plot.setFixedLegendItems(lic);
plot.getDomainAxis().setLowerMargin(0);