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  Aligning date labels with start of day on XYChart
Posted by Mark Chidwick on Mar-05-2017 05:55
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Chart Director Support

I am using ChartDirector (latest version) in Java.

I have a simple XYChart to which I am adding a LineLayer.  The Xaxis is a DateScale.  I set the format for the labels as follows:

XYChart c = new XYChart(xs, ys, Chart.brushedSilverColor(), 0x888888);

c.xAxis().setDateScale(xminDate, xmaxDate, xMajorLabel, xMinorLabel);
// where xminDate is a Date
// where xmaxDate is a Date
// where xMajorLabel is 3600 * 24
// where xMinorLabel is 3600 * 24

c.xAxis().setMultiFormat(Chart.StartOfDayFilter(),
    "<*font=Arial*>{value|mmm d}", Chart.StartOfDayFilter(), "-{value|mmm d}");

layer = c.addLineLayer2();
layer.setXData(xdata);  // xdata is an array of Date[]

PROBLEM:
I have the chart in a scrollPane so that I can set a new start date, reload the chart with new data, then have it re-drawn.  So the date/time of the first sample provided to the chart may not be the start of a day.

I would like the chart to display those points on the X axis that are exactly the start of the day rather than the first sample and every 3600*24 samples after that.

I have attached the complete file that draws a chart for my application.

Can you suggest how I might achieve this.

Many thanks

Mark
DateLineChartPanel.java
DateLineChartPanel.java
9.92 Kb

  Re: Aligning date labels with start of day on XYChart
Posted by Peter Kwan on Mar-05-2017 14:46
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Hi Mark,

For your case, before the line:

c.xAxis().setDateScale(xminDate, xmaxDate, xMajorLabel, xMinorLabel);

please insert:

c.xAxis().setRounding(false, false);

Hope this can help.

Regards
Peter Kwan