Stacked Area color does not match with Legend

[HighWay]

Hi Everyone,

Pasted below is the self-contained source for stacked chart. If you run it, you will see stacked area chart color is not set same as legend.

I will appreciate if you can point me to right direction

Thanks
-Zack

p.s - don`t forget to change output directory path for chart

Code: Select all

import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartUtilities;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.DateAxis;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.labels.StandardXYToolTipGenerator;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.XYItemRenderer;
import org.jfree.data.time.Second;
import org.jfree.data.time.TimeSeries;
import org.jfree.data.time.TimeSeriesCollection;
import org.jfree.data.xy.IntervalXYDataset;

import java.awt.*;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.Date;

public class StackedAreaChartMain {


    SimpleDateFormat formatter = new SimpleDateFormat("MMM.dd.HH.m");
    SimpleDateFormat sdf = new SimpleDateFormat("d-MMM-yyyy");
    DecimalFormat df = new DecimalFormat("#,##0.00");

    public static void main(String [] args) {
        StackedAreaChartMain sacm = new StackedAreaChartMain();
        JFreeChart chart = sacm.getChart();

        File file = null;
        try {
            // specify your path  todo
            file = new File("C:\\tmp\\chart\\" + "TEST_STACKED_CHART_" + System.currentTimeMillis() + ".png");
            OutputStream out = new FileOutputStream(file);
            ChartUtilities.writeChartAsPNG(out, chart, 400, 400);
            out.flush();
            out.close();
        } catch (IOException exce) {
            exce.printStackTrace();
        }

    }

    public JFreeChart getChart() {
        IntervalXYDataset dataset = createDataset();

        //XYArearChart
        JFreeChart chart = ChartFactory.createXYAreaChart(
            "Stacked Chart",
            "X",    //X
            "Y",    //Y
            dataset,
            PlotOrientation.VERTICAL,
            true,  // legend
            true,  // tool tips
            false  // URLs
        );


        XYPlot plot = (XYPlot) chart.getPlot();
        ValueAxis domainAxis = new DateAxis();
        domainAxis.setLowerMargin(0.0);
        domainAxis.setUpperMargin(0.0);
        plot.setDomainAxis(domainAxis);
        plot.setForegroundAlpha(0.5f);

        XYItemRenderer renderer = plot.getRenderer();
        renderer.setToolTipGenerator(new StandardXYToolTipGenerator(StandardXYToolTipGenerator.DEFAULT_TOOL_TIP_FORMAT, sdf, df));
        renderer.setSeriesPaint(0, Color.RED);
        renderer.setSeriesPaint(1, Color.YELLOW);
        renderer.setSeriesPaint(2, Color.BLUE);
        plot.setRenderer(renderer);

        //set bg color
        chart.setBackgroundPaint(Color.white);
        return chart;
    }

    /**
     * Create data set
     */
    private IntervalXYDataset createDataset() {
        TimeSeries abcSeries = new TimeSeries("A_PLUS_B_PLUS_C", Second.class);
        TimeSeries abSeries = new TimeSeries("A_PLUS_B", Second.class);
        TimeSeries aSeries = new TimeSeries("A", Second.class);

        Second day = new Second(new Date(Long.parseLong("1185231632") * 1000));
        abcSeries.add(day, Double.parseDouble("347"));
        abSeries.add(day, Double.parseDouble("234"));
        aSeries.add(day, Double.parseDouble("0"));

        day = new Second(new Date(Long.parseLong("1185231719") * 1000));
        abcSeries.add(day, Double.parseDouble("1865"));
        abSeries.add(day, Double.parseDouble("1560"));
        aSeries.add(day, Double.parseDouble("0"));

        day = new Second(new Date(Long.parseLong("1185231778") * 1000));
        abcSeries.add(day, Double.parseDouble("1585"));
        abSeries.add(day, Double.parseDouble("1280"));
        aSeries.add(day, Double.parseDouble("0"));

        TimeSeriesCollection dataset = new TimeSeriesCollection();
        dataset.addSeries(abcSeries);
        dataset.addSeries(abSeries);
        dataset.addSeries(aSeries);
        return dataset;
    }
} 

[david.gilbert]

The problem here is that the plot is using alpha transparency while the legend is not, so the colours look different. I'll see if I can add alpha transparency support to the legend items in a future release.

Note also that your chart isn't really a stacked chart...it is a regular area chart, where the values appear to be stacked since you add series values together in the dataset. Nothing wrong with that, if it suits your purposes, of course...

[redbaron]

Hi,

Am facing the same issue with 1.0.10.

Is there a workaround?

thanks,
james.

[chechaquo]

Does 1.0.13 support alpha transparency for legend? I couldn't find this in documentations

[james.matheson]

I found a similar problem where the legend didn't match the data points. I fixed it by changing from StackedXYAreaRenderer to StackedXYAreaRenderer2.