Jfreechart histogram set translucent colours

Question

I have a histogram like this

Here Red histogram in the front, blue in the middle and green at the behind. So the most of the green histogram not able to see. Is there any option to switch between colors when hovering mouse or any other option to see the green and blue histogram.

Here is the code

public class HistogramFrame extends JFrame {

    static double[] red;
    static double[] green;
    static double[] blue;

    public HistogramFrame(String title, double[] red, double[] green, double[] blue) {
        super(title);
        HistogramFrame.red = red;
        HistogramFrame.green = green;
        HistogramFrame.blue = blue;

        JFreeChart jfreechart = ChartFactory.createHistogram("Histograms combination red,blue,green", null, null, createDataset(), PlotOrientation.VERTICAL, true, true, false);
        XYPlot xyplot = (XYPlot) jfreechart.getPlot();
        xyplot.setForegroundAlpha(0.85F);
        XYBarRenderer xybarrenderer = (XYBarRenderer) xyplot.getRenderer();
        xybarrenderer.setDrawBarOutline(false);
        JPanel jpanel = new ChartPanel(jfreechart);
        jpanel.setPreferredSize(new Dimension(1000, 600));
        setContentPane(jpanel);
    }

    private static IntervalXYDataset createDataset() {
        HistogramDataset histogramdataset = new HistogramDataset();
        histogramdataset.addSeries("Red histogram", red, 256);
        histogramdataset.addSeries("Blue histogram", blue, 256);
        histogramdataset.addSeries("Green histogram", green, 256);

        return histogramdataset;
    }

}

An approach using individual translucent colors is examined [here](http://stackoverflow.com/a/28519356/230513). — trashgod, Aug 23 '15 at 13:02
Also try a `StandardBarPainter `, suggested [here](http://stackoverflow.com/a/7092567/230513). — trashgod, Aug 23 '15 at 13:06
@trashgod Thanks. DefaultDrawingSupplier gave translucent colors and fixed the issue — Dilushan, Aug 23 '15 at 14:45

score 1 · Answer 1 · answered Aug 23 '15 at 14:42

Here is the full code for the solution and graph image. Now translucent colors make more clear to see each histograms.

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Paint;
import javax.swing.JFrame;
import javax.swing.JPanel;
import org.jfree.chart.*;
import org.jfree.chart.plot.DefaultDrawingSupplier;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.StandardXYBarPainter;
import org.jfree.chart.renderer.xy.XYBarRenderer;
import org.jfree.data.statistics.HistogramDataset;
import org.jfree.data.xy.IntervalXYDataset;

public class HistogramFrame extends JFrame {

    static double[] red;
    static double[] green;
    static double[] blue;

    public HistogramFrame(String title, double[]     red, double[] green, double[] blue) {
        super(title);
        HistogramFrame.red = red;
        HistogramFrame.green = green;
        HistogramFrame.blue = blue;

        JFreeChart jfreechart = ChartFactory.createHistogram("Histograms combination red,blue,green", null, null, createDataset(), PlotOrientation.VERTICAL, true, true, false);
        XYPlot xyplot = (XYPlot) jfreechart.getPlot();
        xyplot.setForegroundAlpha(0.85F);
        XYBarRenderer xybarrenderer = (XYBarRenderer) xyplot.getRenderer();
        xybarrenderer.setBarPainter(new StandardXYBarPainter());
        //xybarrenderer.setDrawBarOutline(false);
        Paint[] paintArray = {              //code related to translucent colors begin here
            new Color(0x80ff0000, true),
            new Color(0x8000ff00, true),
            new Color(0x800000ff, true)
        };

        xyplot.setDrawingSupplier(new DefaultDrawingSupplier(
            paintArray,
            DefaultDrawingSupplier.DEFAULT_FILL_PAINT_SEQUENCE,
            DefaultDrawingSupplier.DEFAULT_OUTLINE_PAINT_SEQUENCE,
            DefaultDrawingSupplier.DEFAULT_STROKE_SEQUENCE,
            DefaultDrawingSupplier.DEFAULT_OUTLINE_STROKE_SEQUENCE,
            DefaultDrawingSupplier.DEFAULT_SHAPE_SEQUENCE));

        JPanel jpanel = new ChartPanel(jfreechart);
        jpanel.setPreferredSize(new Dimension(1000, 600));
        setContentPane(jpanel);
    }

    private static IntervalXYDataset createDataset() {
        HistogramDataset histogramdataset = new HistogramDataset();
        histogramdataset.addSeries("Red histogram", red, 256);
        histogramdataset.addSeries("Blue histogram", blue, 256);
        histogramdataset.addSeries("Green histogram", green, 256);

        return histogramdataset;
    }

}

Good use of `StandardXYBarPainter`. – trashgod Aug 23 '15 at 15:39 — trashgod, Aug 23 '15 at 15:39

Jfreechart histogram set translucent colours

1 Answers1