Fix Bar Chart Width and Spacing between bars in StackedbarChart for any number of input

Question

I created a StackedBarChart with GroupedStackedBarRenderer for solving problem https://stackoverflow.com/questions/18349933/how-to-create-a-stacked-bar-chart-with-multiple-rows-inside-one-row.

I can have any number of column key and row key, group. Below, I attached some screenshots from my program.The problem is I could not get a standart view ( spaces betwen bars,too big bars if input is less, too thin bars which did not show text written inside it).Before implementing this usecase, I would use setMaxbarWidth but now it does not work.

Here are the code which I use to arrange bars.

    CategoryPlot plot = (CategoryPlot) chart.getPlot();
    plot.setBackgroundPaint(Color.WHITE);
    chart.setBackgroundPaint(new Color(238, 238, 238));
    GroupedStackedBarRenderer renderer = new GroupedStackedBarRenderer();
    //Some insertion here
    KeyToGroupMap map = new KeyToGroupMap("A");
    renderer.setSeriesToGroupMap(map);
    renderer.setItemMargin(0.0);
    /** causes to show bar width half of available space. */
    renderer.setMaximumBarWidth(.5);
    renderer.setDrawBarOutline(true);
    renderer.setShadowVisible(false);
    plot.setRenderer(renderer);
    /** get number axis in plot.Number related axis .x axis in this graph. */
    NumberAxis rangeAxis = (NumberAxis) plot.getRangeAxis();

    renderer.setBaseToolTipGenerator(new CustomToolTipGenerator(getGraphData()));
    renderer.setBarPainter(new StandardBarPainter());
    /** do not show thick in number axis label */
    rangeAxis.setTickLabelsVisible(false);
    rangeAxis.setTickMarksVisible(false);
    rangeAxis.setAxisLineVisible(false);
    CategoryAxis categoryAxis = plot.getDomainAxis();
    categoryAxis.setCategoryMargin(0.05);
    // categoryAxis.setLowerMargin(0.05);
    // categoryAxis.setUpperMargin(0.05);
    categoryAxis.setTickLabelsVisible(false);
    categoryAxis.setTickMarksVisible(false);
    categoryAxis.setAxisLineVisible(false);

I know that there are some methods(setlowerMargin, setCategoryMargin, setUpperMargin) of CategoryDomain.I have made some tries over these methods.But no success. I did not understand why space between bars are so wide.Please help me

picture with 3 column key and 6 group

picture with 2 column key and 4 group

picture with one column key and 2 group

Answer 1

I understand what is wrong with code. I have a wrong KeyToGroup map.I have not grouped any row key inside same groupKey.So I did not get desired view which I want.

Answer 2

You might want to explore more of the negative range in setItemMargin(), as shown here. You can adjust the slider to find the optimal value for your dataset. In the image below, the initial setting is SLIDER_INITIAL_VALUE * INCREMENT, which is –4.2.