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I'm trying to set two colors that need to be switched at every vertical tick label as background of a JFreeChart linechart.

I want the line chart to appear as the image in this link, where two different light grays alternate as background:

image

How can I achieve so in JFreeChart?

P.S. I've seen that there is plot.setRangeTickBandPaint(new Color(200, 200, 100, 100)) method for XYPlot plot type, used in ScatterPlot4 in JFreeChart's demo jar, however, this method does not exist in the line chart plot type.

trashgod
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TomC
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  • Why not `createTimeSeriesChart`? – trashgod Jul 14 '22 at 23:04
  • Hi trashgod, on the X axis I have custom tick labels dinamically created based on the current week, so that the plot shows week numbers (1 to 53) 1 year backwards from today. On the Y axis, on the other hand, I cannot put symbols since it is a "value" axis, with U.o.M. tons. – TomC Jul 16 '22 at 08:15

1 Answers1

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Starting from this time series example and using setRangeTickBandPaint(), I get the result pictured below:

image

In particular, I used

  • Contrasting colors for the background and bands:

      plot.setBackgroundPaint(new Color(0xF0F0F0));
  plot.setRangeTickBandPaint(new Color(0xE0E0E0));

  • A suitable DateFormat on the domain:

      domain.setDateFormatOverride(new SimpleDateFormat("MMM"));

  • A fixed TickUnit on the range:

      NumberAxis range = (NumberAxis) plot.getRangeAxis();
  range.setTickUnit(new NumberTickUnit(5));

  • DateTickMarkPosition.MIDDLE to center the tick labels:

      domain.setTickMarkPosition(DateTickMarkPosition.MIDDLE);

As an aside, there is no line chart plot type. Instead, contrast the source of your chosen ChartFactory with that of a typical time series.

trashgod
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