customization - 堆积条形图，条形图内的百分比组成和 JFreeChart 条形图上方的总数

Question

我正在尝试创建堆积条形图。我的要求是我需要栏内的百分比组成和栏顶部的总数。请提出解决方案。

我的要求：示例：http ://www.jfree.org/jfreechart/api/javadoc/images/StackedBarRenderer3DSample.png

我想要栏内的百分比成分和栏顶部的总成分。

Answer 1

I ran into the same problem too. For some reason the latest version of JFreeChart does not display the percentage composition inside the bar. Here's how I got it to work:

    StackedBarRenderer br = new StackedBarRenderer(true); //enable perc. display
    br.setBarPainter(new StandardBarPainter());
    br.setBaseItemLabelGenerator(new StandardCategoryItemLabelGenerator());
    br.setBaseItemLabelsVisible(true);
    chart.getCategoryPlot().setRenderer(br);

Hope this helps

Answer 2

It's not clear what you are doing now, but using a StackedBarRenderer with setRenderAsPercentages(true) will display the percentages. To get the total, extend StackedBarRenderer, loop through the dataset for each column, and override drawItem() to draw the result. An example may be found in the JFreeChart Demo as part of StackedBarChartDemo3.

As an alternative, consider a custom CategoryToolTipGenerator, added via setBaseToolTipGenerator().

Addendum: You linked to an example using StackedBarRenderer3D, which also has a setRenderAsPercentages() method. It can be extended similarly.