如何对同一图表上的现有jfree饼图部分进行分区

问题描述

我正在使用Jfreechart在Spring MVC中创建一个饼图.我的要求是:

I am using Jfreechart to create a pie chart in Spring MVC. MY requirement is:

i have to create two section,FOUND and LOST on pie chart.also in,LOST section i need to create more sections representing Count of different LOST items. here

现在，我能够在图表上创建两个部分:FOUND和LOST.但我没有得到如何在同一张图上进行LOST部分的分区.我怎样才能做到这一点..请帮助

right now,i am able to create two sections on chart,FOUND and LOST.but i am not getting how to do partition of LOST section on same chart. How can i achieve this..please help

推荐答案

您可能已经开始使用 org.jfree.chart.demo.PieChartDemo1 ，作为源已包含在该发行版中.不幸的是，DefaultPieDataset不支持适用于分区的子类别.

You may have started with org.jfree.chart.demo.PieChartDemo1, as the source is include in the distribution. Unfortunately, DefaultPieDataset does not support sub-categories suitable for partitioning.

以下是一种方法的概述:

Here's an outline of one approach:

• 扩展DefaultPieDataset以包括为分区建模所需的数据，例如Set<String> lost和Set<String> found，代表属于每个分区的键集.

• Extend DefaultPieDataset to include the data required to model the partition, e.g. Set<String> lostand Set<String> found, representing the set of keys belonging to each partition.

使用调色板或相关颜色显示相关项目，例如lost的红色阴影和found的蓝色阴影.此示例说明了GanttRenderer使用饱和度变化的调色板的方法.此示例说明了使用不同色调的调色板进行XYItemRenderer的方法.自然，您需要覆盖getSectionPaint()而不是getItemPaint().

Use a palette or related colors to show related items, e.g. shades of red for lost and shades of blue for found. This example illustrates the approach for GanttRenderer using a palette of varying saturation. This example illustrates the approach for XYItemRenderer using a palette of varying hue. Naturally, you'll need to override getSectionPaint() instead of getItemPaint().

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