使用JFreeChart中的类将double转换为日期格式 [英] To convert the double into date format using a class in JFreeChart

问题描述

我想知道，如果可以将两个参数设置为日期，在此示例中，它将第一个参数视为可比较，将第二个参数视为double。但我希望双重显示为日期。是否有可以使用的类。如果没有是否有其他方式显示为日期。例如，我需要x轴和y轴作为日期。

I would like to know, if it is possible to set the both parameter as date, which in this example it take the first parameter as comparable and the second as double. But i want the double to be displayed as date. Is there a class that can be used. If not Is there other way to display both as date. For instance i need both the x-axis and y-axis as date.

对于 data.addValue（8/4/2012，7.0）

我想要这样（8/4/2012 20:06:02，8/5/2012） - >是否可以使用下图。

I want it like this ("8/4/2012 20:06:02" ,"8/5/2012") --> Is it possible with the graph below.

先谢谢你。

public class Example1 {

    public static void main(String args[]){

        DefaultKeyedValues data = new DefaultKeyedValues();
        data.addValue("8/4/2012" ,7.0);
        data.addValue("19/04/2012",5.0);

        CategoryDataset dataset = DatasetUtilities.createCategoryDataset("Population", data);
        JFreeChart chart = ChartFactory.createBarChart("Population","Date","Population",dataset,PlotOrientation.VERTICAL,true,true,false);
        ChartFrame frame = new ChartFrame("Test", chart);

        //Switch from a Bar Rendered to a LineAndShapeRenderer so the chart looks like an XYChart
        LineAndShapeRenderer renderer = new LineAndShapeRenderer();
        renderer.setBaseLinesVisible(false); //TUrn of the lines
        CategoryPlot plot = (CategoryPlot) chart.getPlot();
        plot.setRenderer(0, renderer);

        NumberAxis numberAxis = (NumberAxis)plot.getRangeAxis();        
        numberAxis.setRange(new Range(0,10));   

        frame.pack();
        frame.setVisible(true);
    }  
}

推荐答案

NumberAxis ，使用 DateAxis 。这将允许您在 DateFormat /DateAxis.html#setDateFormatOverride%28java.text.DateFormat%29\"rel =nofollow> setDateFormatOverride（） method。

Instead of a NumberAxis, use a DateAxis. That will let you use a DateFormat in the setDateFormatOverride() method.

更新： org.jfree.chart.demo.TimeSeriesChartDemo1 中有一个完整的示例。您可能需要 createLineChart（）。这是锄头，你可以让范围轴显示日期。

Update: There's a complete example in org.jfree.chart.demo.TimeSeriesChartDemo1. You might want createLineChart(). Here's hoe you'd make the range axis show dates.

public class Example1 {

    public static void main(String args[]) {
        DefaultKeyedValues data = new DefaultKeyedValues();
        data.addValue("8/4/2012", new Day(8, 4, 2012).getFirstMillisecond());
        data.addValue("19/04/2012", new Day(19, 4, 2012).getFirstMillisecond());
        CategoryDataset dataset = DatasetUtilities
            .createCategoryDataset("Population", data);

        JFreeChart chart = ChartFactory.createLineChart("Population", "Date",
            "Population", dataset, PlotOrientation.VERTICAL, true, true, false);
        CategoryPlot plot = (CategoryPlot) chart.getPlot();
        LineAndShapeRenderer renderer = (LineAndShapeRenderer) plot.getRenderer();
        renderer.setBaseShapesVisible(true);
        renderer.setBaseLinesVisible(false);

        DateAxis range = new DateAxis("Date");
        range.setDateFormatOverride(new SimpleDateFormat("dd/MM/yyyy"));
        plot.setRangeAxis(range);

        ChartFrame frame = new ChartFrame("Test", chart);
        frame.pack();
        frame.setVisible(true);
    }
}

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