How to display Date in a X-axis of Line Graph using Jfreechart

dataset, graph, java, jfreechart

Solution

Use a `org.jfree.data.time.TimeSeries` to store the values rather that an `XYSeries` and a `TimeSeriesCollection` for the Dataset.

This will allow you to add a `RegularTimePeriod` and a double rather than two doubles. `RegularTimePeriod` is implemented by `Day` so you final code would look like this:

private XYDataset createDataset() {
    TimeSeries series1 = new TimeSeries("Data");
    Date date = new Date();
    series1.add(new Day(date),46.6);
    TimeSeriesCollection dataset = new TimeSeriesCollection();
    dataset.addSeries(series1);
    return dataset;
}

Problem

I am trying to display a Line Graph with Time(HH:MM:SS) as X-axis and Number(as Y-Axis). The read data from "Time" column is of the format HH:MM:SS. The way i am populating dataset from which chart is construted is as follows ``` for (Row row : sheet) { Double sar_Val = poiGetCellValue(sar); Double date_val = poiGetCellValue(date); if(sar_Val != null && date_val != null) { series1.add(date_val,sar_Val); } dataset.addSeries(series1); } ``` //poiGetCellValue in the above code returns a double based on the data type Problem is that i have to convert the data under "Time" column which is in format HH:MM:SS to some double value and populate the series1 since add function take only double values. How to display the time in X-Axis once i have converted the value to double Or is there any other method to add to XYseries?

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