一、jFreeChart產(chǎn)生圖形的流程
創(chuàng)建一個(gè)數(shù)據(jù)源（dataset）來(lái)包含將要在圖形中顯示的數(shù)據(jù)?????>>創(chuàng)建一個(gè) JFreeChart 對(duì)象來(lái)代表要顯示的圖形
??????>>把圖形輸出
重要的類和接口：
org.jfree.data.general.Dataset 所有數(shù)據(jù)源類都要實(shí)現(xiàn)的接口
org.jfree.chart.ChartFactory 由它來(lái)產(chǎn)生 JFreeChart 對(duì)象
org.jfree.chart.JFreeChart 所有對(duì)圖形的調(diào)整都是通過(guò)它噢！！
org.jfree.chart.plot.Plot 通過(guò)JFreeChart 對(duì)象獲得它，然后再通過(guò)它對(duì)圖形外部部分（例：坐標(biāo)軸）調(diào)整
注意：它有很多子類，一般都下嗍造型到它的子類！
org.jfree.chart.renderer.AbstractRenderer 通過(guò)JFreeChart 對(duì)象獲得它，然后再通過(guò)它對(duì)圖形內(nèi)部部分
（例：折線的類型）調(diào)整。同樣，針對(duì)不同類型的報(bào)表圖，它有
著不同的子類實(shí)現(xiàn)！在下面我們簡(jiǎn)稱它為 Renderer
下面我們結(jié)合不同類型的圖形來(lái)具體分析這個(gè)流程。
二、餅圖餅圖的dataset 一般是用PieDataset 接口，具體實(shí)現(xiàn)類是 DefaultPieDataset
1、創(chuàng)建一個(gè)數(shù)據(jù)源（dataset）：
private static PieDataset createDataset()
{
DefaultPieDataset defaultpiedataset = new DefaultPieDataset(); //注意是DefaultPieDataset！！
defaultpiedataset.setValue(”O(jiān)ne”, new Double(43.200000000000003D));
defaultpiedataset.setValue(”Two”, new Double(10D));
defaultpiedataset.setValue(”Three”, new Double(27.5D));
defaultpiedataset.setValue(”Four”, new Double(17.5D));
return defaultpiedataset;
}
2、由ChartFactory 產(chǎn)生 JFreeChart 對(duì)象
private static JFreeChart createChart(PieDataset piedataset)
{
JFreeChart jfreechart = ChartFactory.createPieChart(”Pie Chart Demo 1″, //圖形標(biāo)題名稱
piedataset, // dataset
true, // legend?
true, // tooltips?
false); //URLs?
PiePlot pieplot = (PiePlot)jfreechart.getPlot(); //通過(guò)JFreeChart 對(duì)象獲得 plot：PiePlot！！
pieplot.setNoDataMessage(”No data available”); // 沒(méi)有數(shù)據(jù)的時(shí)候顯示的內(nèi)容
return jfreechart;
}
一些重要的方法：
pieplot.setExplodePercent(0,0.3D) //把Lable 為”O(jiān)ne” 的那一塊”挖”出來(lái)30%
3、輸出略
三、柱狀圖柱狀圖的dataset 一般是用CatagoryDataset接口(具體實(shí)現(xiàn)類是DefaultCategoryDataset),也會(huì)用 IntervalXYDataset
接口
1、創(chuàng)建一個(gè)數(shù)據(jù)源（dataset）：
private static CategoryDataset createDataset()
{
String series1 = “First”;
String series2 = “Second”;
String series3 = “Third”;
String category1 = “Category 1″;
String category2 = “Category 2″;
String category3 = “Category 3″;
String category4 = “Category 4″;
String category5 = “Category 5″;
DefaultCategoryDataset defaultcategorydataset = new DefaultCategoryDataset();
defaultcategorydataset.addValue(1.0D, series1, category1);
defaultcategorydataset.addValue(4D, series1, category2);
defaultcategorydataset.addValue(3D, series1, category3);
defaultcategorydataset.addValue(5D, series1, category4);
defaultcategorydataset.addValue(5D, series1, category5);
defaultcategorydataset.addValue(5D, series2, category1);
defaultcategorydataset.addValue(7D, series2, category2);
defaultcategorydataset.addValue(6D, series2, category3);
defaultcategorydataset.addValue(8D, series2, category4);
defaultcategorydataset.addValue(4D, series2, category5);
defaultcategorydataset.addValue(4D, series3, category1);
defaultcategorydataset.addValue(3D, series3, category2);
defaultcategorydataset.addValue(2D, series3, category3);
defaultcategorydataset.addValue(3D, series3, category4);
defaultcategorydataset.addValue(6D, series3, category5);
return defaultcategorydataset;
}
2、由ChartFactory 產(chǎn)生 JFreeChart 對(duì)象
private static JFreeChart createChart(CategoryDataset categorydataset)
{
JFreeChart jfreechart = ChartFactory.createBarChart(”Bar Chart Demo”, //圖形標(biāo)題名稱
“Category”,//domain 軸 Lable
這里先簡(jiǎn)單理解為橫坐標(biāo)Lable好了
“Value”, //range 軸 Lable
這里也先簡(jiǎn)單理解為縱坐標(biāo)Lable好了
categorydataset, // dataset
PlotOrientation.VERTICAL, //垂直顯示
true, // legend?
true, // tooltips?
false); //URLs?
jfreechart.setBackgroundPaint(Color.white); //設(shè)定背景色為白色
CategoryPlot categoryplot = jfreechart.getCategoryPlot(); //獲得 plot：CategoryPlot！！
categoryplot.setBackgroundPaint(Color.lightGray); //設(shè)定圖表數(shù)據(jù)顯示部分背景色
categoryplot.setDomainGridlinePaint(Color.white); //橫坐標(biāo)網(wǎng)格線白色
categoryplot.setDomainGridlinesVisible(true); //可見(jiàn)
categoryplot.setRangeGridlinePaint(Color.white); //縱坐標(biāo)網(wǎng)格線白色
//下面兩行使縱坐標(biāo)的最小單位格為整數(shù)
NumberAxis numberaxis = (NumberAxis)categoryplot.getRangeAxis();
numberaxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());
BarRenderer barrenderer = (BarRenderer)categoryplot.getRenderer(); //獲得renderer 注意這里是下嗍造型
到BarRenderer！！
barrenderer.setDrawBarOutline(false); // Bar的外輪廓線不畫
GradientPaint gradientpaint = new GradientPaint(0.0F, 0.0F, Color.blue,
0.0F, 0.0F, new Color(0, 0, 64)); //設(shè)定特定顏色
GradientPaint gradientpaint1 = new GradientPaint(0.0F, 0.0F, Color.green,
0.0F, 0.0F, new Color(0, 64, 0));
GradientPaint gradientpaint2 = new GradientPaint(0.0F, 0.0F, Color.red,
0.0F, 0.0F, new Color(64, 0, 0));
barrenderer.setSeriesPaint(0, gradientpaint); //給series1 Bar設(shè)定上面定義的顏色
barrenderer.setSeriesPaint(1, gradientpaint1); //給series2 Bar 設(shè)定上面定義的顏色
barrenderer.setSeriesPaint(2, gradientpaint2); //給series3 Bar 設(shè)定上面定義的顏色
CategoryAxis categoryaxis = categoryplot.getDomainAxis(); //橫軸上的 Lable 45度傾斜
categoryaxis.setCategoryLabelPositions(CategoryLabelPositions.UP_45);
return jfreechart;
}
一些重要的方法：（增加一塊標(biāo)記）
IntervalMarker intervalmarker = new IntervalMarker(4.5D, 7.5D);
intervalmarker.setLabel(”Target Range”);
intervalmarker.setLabelFont(new Font(”SansSerif”, 2, 11));
intervalmarker.setLabelAnchor(RectangleAnchor.LEFT);
intervalmarker.setLabelTextAnchor(TextAnchor.CENTER_LEFT);
intervalmarker.setPaint(new Color(222, 222, 255, 128));
categoryplot.addRangeMarker(intervalmarker, Layer.BACKGROUND);
四、折線圖折線圖的dataset 兩種CatagoryDataset接口(具體實(shí)現(xiàn)類是DefaultCategoryDataset),XYDataset 接口
1、CatagoryDataset接口：
A、創(chuàng)建一個(gè)數(shù)據(jù)源（dataset）：
private static CategoryDataset createDataset()
{
String series1 = “First”;
String series2 = “Second”;
String series3 = “Third”;
String type1 = “Type 1″;
String type2 = “Type 2″;
String type3 = “Type 3″;
String type4 = “Type 4″;
String type5 = “Type 5″;
String type6 = “Type 6″;
String type7 = “Type 7″;
String type8 = “Type 8″;
DefaultCategoryDataset defaultcategorydataset = new DefaultCategoryDataset();
defaultcategorydataset.addValue(1.0D, series1, type1);
defaultcategorydataset.addValue(4D, series1, type2);
defaultcategorydataset.addValue(3D, series1, type3);
defaultcategorydataset.addValue(5D, series1, type4);
defaultcategorydataset.addValue(5D, series1, type5);
defaultcategorydataset.addValue(7D, series1, type6);
defaultcategorydataset.addValue(7D, series1, type7);
defaultcategorydataset.addValue(8D, series1, type8);
defaultcategorydataset.addValue(5D, series2, type1);
defaultcategorydataset.addValue(7D, series2, type2);
defaultcategorydataset.addValue(6D, series2, type3);
defaultcategorydataset.addValue(8D, series2, type4);
defaultcategorydataset.addValue(4D, series2, type5);
defaultcategorydataset.addValue(4D, series2, type6);
defaultcategorydataset.addValue(2D, series2, type7);
defaultcategorydataset.addValue(1.0D, series2, type8);
defaultcategorydataset.addValue(4D, series3, type1);
defaultcategorydataset.addValue(3D, series3, type2);
defaultcategorydataset.addValue(2D, series3, type3);
defaultcategorydataset.addValue(3D, series3, type4);
defaultcategorydataset.addValue(6D, series3, type5);
defaultcategorydataset.addValue(3D, series3, type6);
defaultcategorydataset.addValue(4D, series3, type7);
defaultcategorydataset.addValue(3D, series3, type8);
return defaultcategorydataset;
}
B、由ChartFactory 產(chǎn)生 JFreeChart 對(duì)象 (與上面重復(fù)的部分就不再注釋）
private static JFreeChart createChart(CategoryDataset categorydataset)
{
JFreeChart jfreechart = ChartFactory.createLineChart(”Line Chart Demo 1″,
“Type”,
“Value”,
categorydataset,
PlotOrientation.VERTICAL,
true,
true,
false);
jfreechart.setBackgroundPaint(Color.white);
CategoryPlot categoryplot = (CategoryPlot)jfreechart.getPlot();
categoryplot.setBackgroundPaint(Color.lightGray);
categoryplot.setRangeGridlinePaint(Color.white);
NumberAxis numberaxis = (NumberAxis)categoryplot.getRangeAxis();
numberaxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());
numberaxis.setAutoRangeIncludesZero(true);
//獲得renderer 注意這里是下嗍造型到lineandshaperenderer！！
LineAndShapeRenderer lineandshaperenderer = (LineAndShapeRenderer)categoryplot.getRenderer();
lineandshaperenderer.setShapesVisible(true); //series 點(diǎn)（即數(shù)據(jù)點(diǎn)）可見(jiàn)
lineandshaperenderer.setSeriesStroke(0, new BasicStroke(2.0F, 1, 1, 1.0F, new float[] {
10F, 6F
}, 0.0F)); //定義series為”First”的（即series1）點(diǎn)之間的連線 ，這里是虛線，默認(rèn)是直線
lineandshaperenderer.setSeriesStroke(1, new BasicStroke(2.0F, 1, 1, 1.0F, new float[] {
6F, 6F
}, 0.0F)); //定義series為”Second”的（即series2）點(diǎn)之間的連線
lineandshaperenderer.setSeriesStroke(2, new BasicStroke(2.0F, 1, 1, 1.0F, new float[] {
2.0F, 6F
}, 0.0F)); //定義series為”Third”的（即series3）點(diǎn)之間的連線
return jfreechart;
}
一些重要的方法：
lineandshaperenderer.setLineVisible(true) //series 點(diǎn)（即數(shù)據(jù)點(diǎn)）間有連線可見(jiàn)
2、XYDataset 接口：
A、創(chuàng)建一個(gè)數(shù)據(jù)源（dataset）：
private static XYDataset createDataset()
{
XYSeries xyseries = new XYSeries(”First”); //先產(chǎn)生XYSeries 對(duì)象
xyseries.add(1.0D, 1.0D);
xyseries.add(2D, 4D);
xyseries.add(3D, 3D);
xyseries.add(4D, 5D);
xyseries.add(5D, 5D);
xyseries.add(6D, 7D);
xyseries.add(7D, 7D);
xyseries.add(8D, 8D);
XYSeries xyseries1 = new XYSeries(”Second”);
xyseries1.add(1.0D, 5D);
xyseries1.add(2D, 7D);
xyseries1.add(3D, 6D);
xyseries1.add(4D, 8D);
xyseries1.add(5D, 4D);
xyseries1.add(6D, 4D);
xyseries1.add(7D, 2D);
xyseries1.add(8D, 1.0D);
XYSeries xyseries2 = new XYSeries(”Third”);
xyseries2.add(3D, 4D);
xyseries2.add(4D, 3D);
xyseries2.add(5D, 2D);
xyseries2.add(6D, 3D);
xyseries2.add(7D, 6D);
xyseries2.add(8D, 3D);
xyseries2.add(9D, 4D);
xyseries2.add(10D, 3D);
XYSeriesCollection xyseriescollection = new XYSeriesCollection(); //再用XYSeriesCollection添加入XYSeries 對(duì)象
xyseriescollection.addSeries(xyseries);
xyseriescollection.addSeries(xyseries1);
xyseriescollection.addSeries(xyseries2);
return xyseriescollection;
}
B、由ChartFactory 產(chǎn)生 JFreeChart 對(duì)象
private static JFreeChart createChart(XYDataset xydataset)
{
JFreeChart jfreechart = ChartFactory.createXYLineChart(”Line Chart Demo 2″,
“X”,
“Y”,
xydataset,
PlotOrientation.VERTICAL,
true,
true,
false);
jfreechart.setBackgroundPaint(Color.white);
XYPlot xyplot = (XYPlot)jfreechart.getPlot(); //獲得 plot：XYPlot！！
xyplot.setBackgroundPaint(Color.lightGray); //設(shè)定圖表數(shù)據(jù)顯示部分背景色
xyplot.setAxisOffset(new RectangleInsets(5D, 5D, 5D, 5D)); //設(shè)定坐標(biāo)軸與圖表數(shù)據(jù)顯示部分距離
xyplot.setDomainGridlinePaint(Color.white); //網(wǎng)格線顏色
xyplot.setRangeGridlinePaint(Color.white);
//獲得 renderer 注意這里是XYLineAndShapeRenderer ！！
XYLineAndShapeRenderer xylineandshaperenderer = (XYLineAndShapeRenderer)xyplot.getRenderer();
xylineandshaperenderer.setShapesVisible(true); //數(shù)據(jù)點(diǎn)可見(jiàn)
xylineandshaperenderer.setShapesFilled(true); //數(shù)據(jù)點(diǎn)被填充即不是空心點(diǎn)
NumberAxis numberaxis = (NumberAxis)xyplot.getRangeAxis();
numberaxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());
return jfreechart;
}
一些重要的方法：
XYLineAndShapeRenderer xylineandshaperenderer = new XYLineAndShapeRenderer();
xylineandshaperenderer.setSeriesLinesVisible(0, false); //第一個(gè)XYSeries數(shù)據(jù)點(diǎn)間連線不可見(jiàn)
xylineandshaperenderer.setSeriesShapesVisible(1, false); //第二個(gè)XYSeries數(shù)據(jù)點(diǎn)不可見(jiàn)
xyplot.setRenderer(xylineandshaperenderer);
五、時(shí)間序列圖時(shí)間序列圖和折線圖很相似，不同的是它在 domain軸的數(shù)據(jù)是時(shí)間而不是數(shù)字。 時(shí)間序列圖的dataset 是
XYDataset 接口，具體實(shí)現(xiàn)類是TimeSeriesCollection ，和上面類似，有TimeSeries 對(duì)象，它被添加入
TimeSeriesCollection 。
1、創(chuàng)建一個(gè)數(shù)據(jù)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);//這里用的是Month.class，同樣還有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軸上的刻度點(diǎn)代表的是時(shí)間點(diǎn)而不是時(shí)間段
return timeseriescollection;
}
2、由ChartFactory 產(chǎn)生 JFreeChart 對(duì)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(); //獲得 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); //數(shù)據(jù)點(diǎn)可見(jiàn)
xylineandshaperenderer.setDefaultShapesFilled(true); //數(shù)據(jù)點(diǎn)是實(shí)心點(diǎn)
}
DateAxis dateaxis = (DateAxis)xyplot.getDomainAxis(); //對(duì)domain 軸上日期顯示格式定義
dateaxis.setDateFormatOverride(new SimpleDateFormat(”MMM-yyyy”));
return jfreechart;
}
一些重要的方法：
A、增加標(biāo)記線：
xyplot.addRangeMarker(new ValueMarker(550D)); //數(shù)值軸
Quarter quarter = new Quarter(2, 2002);
xyplot.addDomainMarker(new ValueMarker(quarter.getMiddleMillisecond())); //時(shí)間軸
B、數(shù)據(jù)點(diǎn)的調(diào)整
XYLineAndShapeRenderer xylineandshaperenderer = (XYLineAndShapeRenderer)xyplot.getRenderer();
xylineandshaperenderer.setDefaultShapesVisible(true); //數(shù)據(jù)點(diǎn)可見(jiàn)
xylineandshaperenderer.setSeriesFillPaint(0, Color.red); //數(shù)據(jù)點(diǎn)填充為紅色
xylineandshaperenderer.setSeriesFillPaint(1, Color.white); //數(shù)據(jù)點(diǎn)填充為白色
xylineandshaperenderer.setUseFillPaint(true); //應(yīng)用
C、平均值曲線
這個(gè)曲線有什么用呢？很簡(jiǎn)單的例子，這里有一個(gè)以半年每天為單位的數(shù)據(jù)繪制的曲線，我們想看看以月為單位數(shù)據(jù)
的變化，這時(shí)就可以用到它了。
TimeSeries timeseries = createEURTimeSeries(); //就是以半年每天為單位的數(shù)據(jù)
TimeSeries timeseries1 = MovingAverage.createMovingAverage(timeseries,
“30 day moving average”,
30, //30天為一個(gè)周期
30); //最開(kāi)始的30天跳過(guò)
TimeSeriesCollection timeseriescollection = new TimeSeriesCollection();
timeseriescollection.addSeries(timeseries);
timeseriescollection.addSeries(timeseries1);
return timeseriescollection;
六、總結(jié)一下dataset plot renderer
餅圖 PieDataset（DefaultPieDataset） PiePlot ——
柱狀圖 CatagoryDataset（DefaultCategoryDataset） CategoryPlot BarRenderer
折線圖 CatagoryDataset（DefaultCategoryDataset） CategoryPlot LineAndShapeRenderer
XYDataset（XYSeriesCollection） XYPlot XYLineAndShapeRenderer
時(shí)間序列圖 XYDataset （TimeSeriesCollection） XYPlot XYLineAndShapeRenderer
這里只是一些常用的方法，具體還是看API
七、Item Lable這里以柱狀圖為例說(shuō)明，具體來(lái)說(shuō)就是在每個(gè)柱狀上顯示它的數(shù)據(jù)，具體有下面內(nèi)容：
A、使 Item Lable 可見(jiàn)
B、調(diào)整 Item Lable 的顏色、字體等
C、調(diào)整 Item Lable 的位置
D、定制 Item Lable 的內(nèi)容
1、分配一個(gè) Lable Generator 給 renderer
BarRenderer barrenderer = (BarRenderer)categoryplot.getRenderer();
GategoryLableGenerator generator =new StandardGategoryLableGenerator(
“{2}”, new DecimalFormat(”0.00″) //調(diào)整顯示的數(shù)字和字符格式
);
barrenderer.setLableGenerator(generator);
2、使 Item Lable 可見(jiàn)
barrenderer.setItemLableVisible(true);
3、調(diào)整 Item Lable 的顏色、字體等
barrenderer.setItemLablePaint(Color.red);
barrenderer.setItemLableFont(new Font(”SansSerif”,Font.PLAIN,10));
4、調(diào)整 Item Lable 的位置
這里涉及到一個(gè)新的對(duì)象 ItemLablePosition , ItemLablePosition的構(gòu)造函數(shù)有兩個(gè)或四個(gè)參數(shù)
public ItemLabelPosition(ItemLabelAnchor itemLabelAnchor,
org.jfree.ui.TextAnchor textAnchor,
org.jfree.ui.TextAnchor rotationAnchor,
double angle)
itemLabelAnchor - Item Lable 的位置 （最重要的！！）
textAnchor - Item Lable里包含的正文相對(duì)于Item Lable 的位置
rotationAnchor - Item Lable里包含的正文旋轉(zhuǎn)的位置
angle - 旋轉(zhuǎn)的角度
ItemLabelPosition itemlabelposition = new ItemLabelPosition(ItemLabelAnchor.INSIDE12,
TextAnchor.CENTER_RIGHT,
TextAnchor.CENTER_RIGHT,
-1.57D);
barrenderer.setPositiveItemLabelPosition(itemlabelposition);
這樣就可以每個(gè)柱狀上顯示它的數(shù)據(jù)了，當(dāng)然可以定制 Item Lable 的內(nèi)容，比如 Item Lable text 超過(guò)100的才
顯示，這樣就需要定制自己的類，它要實(shí)現(xiàn)GategoryLableGenerator 接口，實(shí)現(xiàn)generateItemLable()方法