将静态网格线添加到JFreeChart时间序列图 [英] Adding a static gridline to a JFreeChart time series chart

问题描述

我正在尝试在JFreeChart中实现具有特殊要求的时间序列图.我可以绘制图表，但是我不知道如何在图表的最后一个值处实现垂直红线.它应始终位于同一位置，并且应始终与最后一个值相交.

I am trying to implement a timeseries chart with a peculiar requirement in JFreeChart. I can draw the chart, but I don't know how to implement the vertical red line at the last value in the chart. It should always be in the same spot and should always intersect with the last value.

我绝对不知道该怎么做.我当时以为可以将它实现为静态网格线，但是我不知道如何指定它.

I am absolutely out of ideas on how this would be done. I was thinking that it might be possible to implement it as a static gridline, but I don't know how to specify one.

此外，图表的大小将是静态的，因此可以接受某种绕行方式，希望不引入任何第三方库.

Also, the size of the charts will be static, so some roundabout way of doing this is acceptable, hopefully without introducing any 3rd party libraries.

可以在此处找到图片.

谢谢.

推荐答案

好吧，我使用标记解决了它.这是执行此操作的代码:

Well, I solved it using a marker. Here's the code that does it:

JFreeChart chart = ChartFactory.createTimeSeriesChart(...);
XYPlot plot = chart.getXYPlot();
Long timestampToMark = new Date().getTime();
Marker m = new ValueMarker(timestampToMark);
m.setStroke(new BasicStroke(2));
m.setPaint(Color.RED);
plot.addDomainMarker(m);

也许其他人会发现这很有用.

Maybe someone else will find this useful.

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