JfreeChart：堆叠条形图和CategoryAxis显示日期 [英] JfreeChart: Stacked Bar Chart and CategoryAxis showing dates

问题描述

我创建了一个堆叠条形图，其中显示了 y 轴上的计数和 x 轴上的日期。问题是，当我在 x 轴上有很多日期时，它变得很杂乱，不可能读取。我想只显示一些日期，例如每周一个日期。那可能吗？我使用 ChartFactory.createStackedBarChart（）创建图表，我有一个 DefaultCategoryDataSet 中的数据。

解决方案

CategoryAxis ，它用于 StackedBarChart 中的域轴，您可以使用方法< a href =http://www.jfree.org/jfreechart/api/javadoc/org/jfree/chart/axis/CategoryAxis.html#setCategoryLabelPositions%28org.jfree.chart.axis.CategoryLabelPositions%29 =nofollow > setCategoryLabelPositions（） 。典型用法在 BarChartDemo1 源，显示为此处。

  CategoryAxis domainAxis = plot.getDomainAxis（）; 
 domainAxis.setCategoryLabelPositions（
 CategoryLabelPositions.createUpRotationLabelPositions（Math.PI / 6.0））; 
  

I have created a stacked bar chart in which I show a count on the y axis and dates on the x axis. The problem is that when I have many dates on the x axis it gets very cluttered and impossible to read. I would like to show only some of the dates, e.g one date per week. Is that possible? I am using ChartFactory.createStackedBarChart() to create the chart, and I have the data in a DefaultCategoryDataSet.

Any input is appreciated!

解决方案

For a CategoryAxis, which is used the for the domain axis in a StackedBarChart, you have considerable flexility with the method setCategoryLabelPositions(). Typical usage is illustrated in the BarChartDemo1 source, shown here.

CategoryAxis domainAxis = plot.getDomainAxis();
domainAxis.setCategoryLabelPositions(
    CategoryLabelPositions.createUpRotationLabelPositions(Math.PI / 6.0));

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