JFreeChart 在 ChartPanel 中创建工具提示

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问题描述

如何在 JFreeChart 中在图表鼠标悬停时生成工具提示?我试过这个:

How can I generate a tooltip on chart mouse over in JFreeChart? I tried this:

chartPanel.setToolTipText("this is the string");

但这不起作用.我应该先做点别的吗?像这样:

but this does not work. Am I supposed to do something else before? Something like this:

chartPanel.createToolTip().

我在 chartMouseMoved 事件中调用这些方法.

I am calling these methods in the chartMouseMoved event.

推荐答案

大多数 ChartFactory 方法包括一个 boolean tooltips 参数.只需查看您选择的工厂的源代码，即可了解如何实例化适合指定渲染器的默认工具提示生成器.您不需要自己处理这些事件.

Most ChartFactory methods include a boolean tooltips parameter. Just look in the source for your factory of choice to see how to instantiate a default tooltip generator suitable for the designated renderer. You shouldn't need to handle the events yourself.

附录:当您使用 createXYLineChart 时，StandardXYToolTipGenerator 是默认提供的.DEFAULT_TOOL_TIP_FORMAT 是 {0}: ({1}, {2})；MessageFormat 符号分别代表dataset、series 和item.您可以在自己的生成器中使用这些符号，如下所示 XYItemLabelGenerator，或者您可以覆盖 generateToolTip() 以返回任何内容.

Addendum: As you are using createXYLineChart, an instance of StandardXYToolTipGenerator is supplied by default. The DEFAULT_TOOL_TIP_FORMAT is {0}: ({1}, {2}); the MessageFormat symbols represent the dataset, series and item, respectively. You can use these symbols in your own generator, as shown in this XYItemLabelGenerator, or you can override generateToolTip() to return anything at all.

附录:这是一个仅显示 dataset 的示例:

Addendum: Here's an example that shows just the dataset:

XYPlot plot = chart.getXYPlot();
XYLineAndShapeRenderer renderer = (XYLineAndShapeRenderer) plot.getRenderer();
renderer.setLegendItemToolTipGenerator(
    new StandardXYSeriesLabelGenerator("Legend {0}"));

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