Question

我正试图执行 a series克,在JFreeChart有特殊要求。我可以提取图表,但我不知道如何按照图表的最后价值执行垂直红线。它应始终处于同一地点,并应始终与最后价值交叉。

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,海图的大小也将是固定的,因此,某些四舍五入的方式是可以接受的,希望不引入任何三边图书馆。

http://i55.tinypic.com/2l8ystc.png” rel=“nofollow”here。

感谢。

Answer 1

我用标记解决问题。这部法律是:

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);

也许其他人会认为这一点有用。

Answer 2

I d just set a custom cross-hair on the last domain value:

XYPlot plot = chart.getXYPlot();
plot.setDomainCrosshairVisible(true);
plot.setDomainCrosshairPaint(Color.red);
plot.setDomainCrosshairStroke(new BasicStroke(3f));
plot.setDomainCrosshairValue(dataset.getXValue(0, dataset.getItemCount(0) - 1));

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