public class Example {
public static void main(String args[]){
/*creating timeSeriesCollection*/
TimeSeriesCollection dataset = new TimeSeriesCollection();
TimeSeries timeSeries1 = new TimeSeries("Sample 1");
timeSeries1.add(new Day(8,4, 2012), 7.0);
timeSeries1.add(new Day(19,4, 2012), 5.0);
dataset.addSeries(timeSeries1);
/*Creating the chart*/
JFreeChart chart = ChartFactory.createTimeSeriesChart("Population","Date","Population",dataset,true,true,false);
/*Altering the graph */
XYPlot plot = (XYPlot) chart.getPlot();
plot.setAxisOffset(new RectangleInsets(5.0, 10.0, 10.0, 5.0));
plot.setDomainCrosshairVisible(true);
plot.setRangeCrosshairVisible(true);
XYLineAndShapeRenderer renderer = (XYLineAndShapeRenderer)plot.getRenderer();
renderer.setBaseShapesVisible(true);
renderer.setBaseShapesFilled(true);
NumberAxis numberAxis = (NumberAxis)plot.getRangeAxis();
numberAxis.setRange(new Range(0,10));
DateAxis axis = (DateAxis) plot.getDomainAxis();
axis.setDateFormatOverride(new SimpleDateFormat("dd-MM-yyyy"));
axis.setAutoTickUnitSelection(false);
axis.setVerticalTickLabels(true);
/* Displaying the chart*/
ChartFrame frame = new ChartFrame("Test", chart);
frame.pack();
frame.setVisible(true);
}
}
我已经编写了上面的代码,它工作得很好,但是在渲染图表时,它显示的日期没有值。它在 y 轴上显示 9/4/12
、10/4/2012
到 18/4/2012
等日期,但没有一个值。如何删除没有值(value)的日期。为什么它会这样?
谁能帮帮我吗?
最佳答案
试试这个:
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);
}
}
不要使用 TimeSeriesChart
,而是使用 @Dirk 建议的 CategoryDataSet,然后切换到 LineAndShapeRenderer
。
关于java - 在 jfreechart TimeSeriesCollection 中如何显示仅具有值的日期?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/12297851/