| 时间序列图 时间序列图和折线图很相似，不同的是它在 domain轴的数据是时间而不是数字。 时间序列图的dataset 是 XYDataset 接口，具体实现类是TimeSeriesCollection ，和上面类似，有TimeSeries 对象，它被添加入 TimeSeriesCollection 。 1、创建一个数据源（dataset）： private static XYDataset createDataset() { TimeSeries timeseries = new TimeSeries("L&G European Index Trust",Month.class); timeseries.add(new Month(2, 2001), 181.8D);//这里用的是Month.class，同样还有Day.class Year.class 等等 timeseries.add(new Month(3, 2001), 167.3D); timeseries.add(new Month(4, 2001), 153.8D); timeseries.add(new Month(5, 2001), 167.6D); timeseries.add(new Month(6, 2001), 158.8D); timeseries.add(new Month(7, 2001), 148.3D); timeseries.add(new Month(8, 2001), 153.9D); timeseries.add(new Month(9, 2001), 142.7D); timeseries.add(new Month(10, 2001), 123.2D); timeseries.add(new Month(11, 2001), 131.8D); timeseries.add(new Month(12, 2001), 139.6D); timeseries.add(new Month(1, 2002), 142.9D); timeseries.add(new Month(2, 2002), 138.7D); timeseries.add(new Month(3, 2002), 137.3D); timeseries.add(new Month(4, 2002), 143.9D); timeseries.add(new Month(5, 2002), 139.8D); timeseries.add(new Month(6, 2002), 137D); timeseries.add(new Month(7, 2002), 132.8D); TimeSeries timeseries1 = new TimeSeries("L&G UK Index Trust",Month.class); timeseries1.add(new Month(2, 2001), 129.6D); timeseries1.add(new Month(3, 2001), 123.2D); timeseries1.add(new Month(4, 2001), 117.2D); timeseries1.add(new Month(5, 2001), 124.1D); timeseries1.add(new Month(6, 2001), 122.6D); timeseries1.add(new Month(7, 2001), 119.2D); timeseries1.add(new Month(8, 2001), 116.5D); timeseries1.add(new Month(9, 2001), 112.7D); timeseries1.add(new Month(10, 2001), 101.5D); timeseries1.add(new Month(11, 2001), 106.1D); timeseries1.add(new Month(12, 2001), 110.3D); timeseries1.add(new Month(1, 2002), 111.7D); timeseries1.add(new Month(2, 2002), 111D); timeseries1.add(new Month(3, 2002), 109.6D); timeseries1.add(new Month(4, 2002), 113.2D); timeseries1.add(new Month(5, 2002), 111.6D); timeseries1.add(new Month(6, 2002), 108.8D); timeseries1.add(new Month(7, 2002), 101.6D); TimeSeriesCollection timeseriescollection = new TimeSeriesCollection(); timeseriescollection.addSeries(timeseries); timeseriescollection.addSeries(timeseries1); timeseriescollection.setDomainIsPointsInTime(true); //domain轴上的刻度点代表的是时间点而不是时间段 return timeseriescollection; } 2、由ChartFactory 产生 JFreeChart 对象 private static JFreeChart createChart(XYDataset xydataset) { JFreeChart jfreechart = ChartFactory.createTimeSeriesChart("Legal & General Unit Trust Prices", "Date", "Price Per Unit", xydataset, true, true, false); jfreechart.setBackgroundPaint(Color.white); XYPlot xyplot = (XYPlot)jfreechart.getPlot(); //获得 plot : XYPlot!! xyplot.setBackgroundPaint(Color.lightGray); xyplot.setDomainGridlinePaint(Color.white); xyplot.setRangeGridlinePaint(Color.white); xyplot.setAxisOffset(new RectangleInsets(5D, 5D, 5D, 5D)); xyplot.setDomainCrosshairVisible(true); xyplot.setRangeCrosshairVisible(true); org.jfree.chart.renderer.xy.XYItemRenderer xyitemrenderer = xyplot.getRenderer(); if(xyitemrenderer instanceof XYLineAndShapeRenderer) { XYLineAndShapeRenderer xylineandshaperenderer = (XYLineAndShapeRenderer)xyitemrenderer; xylineandshaperenderer.setDefaultShapesVisible(true); //数据点可见 xylineandshaperenderer.setDefaultShapesFilled(true); //数据点是实心点 } DateAxis dateaxis = (DateAxis)xyplot.getDomainAxis(); //对domain 轴上日期显示格式定义 dateaxis.setDateFormatOverride(new SimpleDateFormat("MMM-yyyy")); return jfreechart; } 一些重要的方法： A、增加标记线： xyplot.addRangeMarker(new ValueMarker(550D)); //数值轴 Quarter quarter = new Quarter(2, 2002); xyplot.addDomainMarker(new ValueMarker(quarter.getMiddleMillisecond())); //时间轴 B、数据点的调整 XYLineAndShapeRenderer xylineandshaperenderer = (XYLineAndShapeRenderer)xyplot.getRenderer(); xylineandshaperenderer.setDefaultShapesVisible(true); //数据点可见 xylineandshaperenderer.setSeriesFillPaint(0, Color.red); //数据点填充为红色 xylineandshaperenderer.setSeriesFillPaint(1, Color.white); //数据点填充为白色 xylineandshaperenderer.setUseFillPaint(true); //应用 C、平均值曲线 这个曲线有什么用呢？很简单的例子，这里有一个以半年每天为单位的数据绘制的曲线，我们想看看以月为单位数据 的变化，这时就可以用到它了。 TimeSeries timeseries = createEURTimeSeries(); //就是以半年每天为单位的数据 TimeSeries timeseries1 = MovingAverage.createMovingAverage(timeseries, "30 day moving average", 30, //30天为一个周期 30); //最开始的30天跳过 TimeSeriesCollection timeseriescollection = new TimeSeriesCollection(); timeseriescollection.addSeries(timeseries); timeseriescollection.addSeries(timeseries1); return timeseriescollection; |
