Vaadin Pie Charts: determining if DataSeriesItem is "sliced or not sliced"

Flow
1

Hi,

is there a way to determine if some DataSeriesItem is sliced/not sliced on PointClickEvent?

Here’s a slightly modified sample taken directly from http://demo.vaadin.com/charts/#PieChart:

package com.example.testcharts;

import javax.servlet.annotation.WebServlet;

import com.vaadin.addon.charts.Chart;
import com.vaadin.addon.charts.PointClickEvent;
import com.vaadin.addon.charts.PointClickListener;
import com.vaadin.addon.charts.model.ChartType;
import com.vaadin.addon.charts.model.Configuration;
import com.vaadin.addon.charts.model.Cursor;
import com.vaadin.addon.charts.model.DataSeries;
import com.vaadin.addon.charts.model.DataSeriesItem;
import com.vaadin.addon.charts.model.Labels;
import com.vaadin.addon.charts.model.PlotOptionsPie;
import com.vaadin.annotations.Theme;
import com.vaadin.annotations.VaadinServletConfiguration;
import com.vaadin.server.VaadinRequest;
import com.vaadin.server.VaadinServlet;
import com.vaadin.ui.Component;
import com.vaadin.ui.UI;
import com.vaadin.ui.VerticalLayout;

@SuppressWarnings("serial")
@Theme("testcharts")
public class TestchartsUI extends UI {

    @Override
    public String getDescription() {
        return "Pie chart";
    }

    protected Component getChart() {
        Component ret = createChart();
        ret.setWidth("100%");
        ret.setHeight("450px");
        return ret;
    }

    public static Chart createChart() {
        Chart chart = new Chart(ChartType.PIE);
        chart.setImmediate(true);

        Configuration conf = chart.getConfiguration();

        conf.setTitle("Browser market shares at a specific website, 2010");

        PlotOptionsPie plotOptions = new PlotOptionsPie();
        plotOptions.setCursor(Cursor.POINTER);

        plotOptions.setAllowPointSelect(true);

        Labels dataLabels = new Labels();
        dataLabels.setEnabled(true);
        dataLabels.setFormatter("''+ this.point.name +': '+ this.percentage +' %'");
        plotOptions.setDataLabels(dataLabels);
        conf.setPlotOptions(plotOptions);

        final DataSeries series = new DataSeries();
        series.add(new DataSeriesItem("Firefox", 45.0));
        series.add(new DataSeriesItem("IE", 26.8));
        DataSeriesItem chrome = new DataSeriesItem("Chrome", 12.8);
        // chrome.setSliced(true);
        // chrome.setSelected(true);
        series.add(chrome);
        series.add(new DataSeriesItem("Safari", 8.5));
        series.add(new DataSeriesItem("Opera", 6.2));
        series.add(new DataSeriesItem("Others", 0.7));
        conf.setSeries(series);

        chart.addPointClickListener(new PointClickListener() {

            @Override
            public void onClick(PointClickEvent event) {
                [b]
// Notification.show("Click: " +

                DataSeries series = (DataSeries) event.getSeries();
                DataSeriesItem item = series.get(event.getPointIndex());
                System.out.println(">>> PointClickListener");
                System.out.println(">>>   data series item: " + item);
                System.out.println(">>>     is sliced = " + item.getSliced());
[/b]
            }
        });

        chart.drawChart(conf);

        return chart;
    }

    @WebServlet(value = "/*", asyncSupported = true)
    @VaadinServletConfiguration(productionMode = false, ui = TestchartsUI.class, widgetset = "com.example.testcharts.widgetset.TestchartsWidgetset")
    public static class Servlet extends VaadinServlet {
    }

    @Override
    protected void init(VaadinRequest request) {
        System.setProperty("vaadin.charts.developer.license", "ec7cf490-aa3e-429b-90fd-d31a95cefa7e");

        final VerticalLayout layout = new VerticalLayout();
        layout.setMargin(true);
        setContent(layout);

        layout.addComponent(getChart());
    }

}

According to

plotOptions.setAllowPointSelect(true); when some point is being clicked the corresponding DataSeriesItem changes to sliced/not sliced states back and forth.

In the “onClick” method within the PointClickListener one needs to determine the state to which the clicked DataSeriesItem has been set: sliced or not sliced.

If
DataSeriesItem.getSliced()
 method is being used with
Vaadin Charts 2.1.0, 2.1.1
 you get an exception:
java.lang.NullPointerException at com.vaadin.addon.charts.model.AbstractSeriesItem.getSliced(AbstractSeriesItem.java:122)

With
Vaadin Charts 1.1.9
 no exception occurs, but getSliced() always returns
false
regardless of the point’s actual state.

Probably inside the onClick method the point’s “sliced” state has not been set yet for the moment. Any workarounds?

Thanks!