jfreechart - JFreeChart：将列标签上移

Question

正如我在图片中显示的那样，我想将列标签（值 434、2562、....）向上移动一点。有什么办法可以配置吗？我最初的问题是，由于列之间的差异，最后两列上的标签不再可见（它们实际上是 15 和 24 或类似的 stg）。我不知道如何改变它。谢谢

Answer 1

You can use BarRenderer3D.setSeriesPositiveItemLabelPosition.

For example :

  DefaultCategoryDataset dataset = new DefaultCategoryDataset();
  dataset.addValue(51.0, "Series 1", "key1");
  dataset.addValue(44.3, "Series 1", "key2");

  // create the chart...
  JFreeChart chart = ChartFactory.createBarChart3D("Demo","Category","Value",dataset,PlotOrientation.VERTICAL,false,true,false);


  CategoryPlot plot = chart.getCategoryPlot();

  CategoryAxis domainAxis = plot.getDomainAxis();
  domainAxis.setVisible(false);

  NumberAxis rangeAxis = (NumberAxis) plot.getRangeAxis();
  rangeAxis.setUpperMargin(0.15);

  BarRenderer3D renderer = (BarRenderer3D) plot.getRenderer();
  CategoryItemLabelGenerator generator = new StandardCategoryItemLabelGenerator();
  renderer.setSeriesItemLabelGenerator(0, generator);
  renderer.setSeriesItemLabelsVisible(0, true);
  renderer.setSeriesPositiveItemLabelPosition(0, new ItemLabelPosition(ItemLabelAnchor.OUTSIDE12,TextAnchor.BASELINE_CENTER));
  renderer.setItemLabelAnchorOffset(10);

The result is :

Answer 2

CategoryPlot plot = (CategoryPlot) chart.getPlot();

BarRenderer renderer = (BarRenderer) plot.getRenderer();

renderer.setBasePositiveItemLabelPosition(new ItemLabelPosition(ItemLabelAnchor.OUTSIDE12, TextAnchor.TOP_CENTER,TextAnchor.HALF_ASCENT_CENTER,0D));