how to display customized values on a bar in bar chart using jfree chart?

问题

By using StandardCategoryItemLabelGenerator() Iam able to display the exact range axis value on a bar, Now my problem is I dont want to display the range axis value instead I want to display some other value of that bar How I can achieve that?

for (String IDS : idMap.keySet()) {
    List<String> listValues = idMap.get(IDS);
    if(listValues != null && listValues.get(1) != null) {
       dataSet.setValue(Double.valueOf(listValues.get(1)), "", IDS);
    }
}
JFreeChart chart = ChartFactory.createBarChart3D("", "", "Time taken ", dataSet,PlotOrientation.VERTICAL, true, true, false);
chart.setTitle(new org.jfree.chart.title.TextTitle("Time Duration",new java.awt.Font("SansSerif", java.awt.Font.BOLD, 10)));
chart.getLegend().setItemFont(new java.awt.Font("SansSerif",0,7));
chart.removeLegend();
final CategoryPlot plot = chart.getCategoryPlot();
plot.setNoDataMessage("No data available");
final CategoryItemRenderer renderer = plot.getRenderer();
renderer.setItemLabelsVisible(true);
final BarRenderer r = (BarRenderer) renderer;
r.setMaximumBarWidth(0.05);
r.setBaseItemLabelGenerator(new StandardCategoryItemLabelGenerator());
r.setBaseItemLabelsVisible(true);
r.setSeriesItemLabelFont(0, new java.awt.Font("Times New Roman",Font.NORMAL,7));
r.setSeriesPositiveItemLabelPosition(0,     
                    new ItemLabelPosition(ItemLabelAnchor.OUTSIDE3, TextAnchor.BOTTOM_LEFT, TextAnchor.BOTTOM_LEFT, -Math.PI/2));
final ValueAxis rangeAxis = plot.getRangeAxis();
rangeAxis.setLabelFont(new java.awt.Font("SansSerif", java.awt.Font.BOLD, 8));
final CategoryAxis axis = plot.getDomainAxis();
axis.setLabel("ids");
axis.setLabelFont(new java.awt.Font("SansSerif", java.awt.Font.BOLD, 8));
axis.setCategoryLabelPositions(CategoryLabelPositions.createUpRotationLabelPositions(Math.PI / 8.0));
axis.setTickLabelFont(new java.awt.Font("SansSerif", java.awt.Font.BOLD, 6));
plot.setDomainGridlinesVisible(true);
plot.setRangeGridlinesVisible(true);

By using the above code iam able to display exact range axis value on a bar, but I dont want the range axis value I need some other value listValues.get(2) to be displayed on a bar How I can achieve that?

回答1:

StandardCategoryItemLabelGenerator uses an instance of MessgeFormat for this, defaulting to ArgumentIndex {2}. The other ArgumentIndex values are defined in the abstract parent. For example,

renderer.setBaseItemLabelGenerator(
    new StandardCategoryItemLabelGenerator(
        "{0} {1} {2} {3}", NumberFormat.getInstance()));
renderer.setBaseItemLabelsVisible(true);

You can also override generateLabel() to return any value you want.

回答2:

renderer.setBaseItemLabelGenerator(
new StandardCategoryItemLabelGenerator()
 @Override
 public String generateLabel(CategoryDataset dataset, int row, int column) {
        return "Your Text" +row+","+column;
 }
);

来源：https://stackoverflow.com/questions/13625740/how-to-display-customized-values-on-a-bar-in-bar-chart-using-jfree-chart

标签

jfreechart