這里分三部分來介紹 jFreeChart 。第一部分介紹jFreeChart產生
圖形的流程及相關的重要的類；第二部分介紹四種常用的報表圖（餅圖、柱狀圖、折線圖、時間序列圖）；第三部分
介紹在圖形中增加Item Lable 。
jFreeChart 的版本是jfreechart-1.0.0-pre2(1)

[b]一、jFreeChart產生圖形的流程[/b]
?? 創建一個數據源（dataset）來包含將要在圖形中顯示的數據,創建一個 JFreeChart 對象來代表要顯示的圖形
?? 把圖形輸出
?? 重要的類和接口：
?? org.jfree.data.general.Dataset? 所有數據源類都要實現的接口
?? org.jfree.chart.ChartFactory??? 由它來產生 JFreeChart 對象
?? org.jfree.chart.JFreeChart??? 所有對圖形的調整都是通過它噢！！
?? org.jfree.chart.plot.Plot??? 通過JFreeChart 對象獲得它，然后再通過它對圖形外部部分（例：坐標軸）調整
??????????????????????????????? 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JFreeChart 對象獲得它，然后再通過它對圖形內部部分
??????????????????????????????????????????????? （例：折線的類型）調整。同樣，針對不同類型的報表圖，它有
??????????????????????????????????????????????? 著不同的子類實現！在下面我們簡稱它為 Renderer
?? 下面我們結合不同類型的圖形來具體分析這個流程。
??
[b]二、餅圖[/b]
?? 餅圖的dataset 一般是用PieDataset 接口，具體實現類是 DefaultPieDataset
?? 1、創建一個數據源（dataset）：
??? private static PieDataset createDataset()
??? {
??????? DefaultPieDataset defaultpiedataset = new DefaultPieDataset(); //注意是DefaultPieDataset??！
??????? defaultpiedataset.setValue("One", 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? 產生 JFreeChart 對象
??? private static JFreeChart createChart(PieDataset piedataset)
??? {
??????? JFreeChart jfreechart = ChartFactory.createPieChart("Pie Chart Demo 1",? //圖形標題名稱
????????????????????????????????????????????????????????????? piedataset,?? // dataset
????????????????????????????????????????????????????????????? true,????? // legend?
????????????????????????????????????????????????????????????? true,???? // tooltips?
????????????????????????????????????????????????????????????? false);? //URLs?
??????? PiePlot pieplot = (PiePlot)jfreechart.getPlot();? //通過JFreeChart 對象獲得 plot：PiePlot！！
??????? pieplot.setNoDataMessage("No data available");??? // 沒有數據的時候顯示的內容
??????? return jfreechart;
??? }
??? 一些重要的方法：
??? pieplot.setExplodePercent(0,0.3D) //把Lable 為"One" 的那一塊”挖“出來30%???
?? 3、輸出略?
??
[b]三、柱狀圖[/b]
?? 柱狀圖的dataset 一般是用CatagoryDataset接口(具體實現類是DefaultCategoryDataset),也會用 IntervalXYDataset
?? 接口
?? 1、創建一個數據源（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? 產生 JFreeChart 對象???
??? private static JFreeChart createChart(CategoryDataset categorydataset)
??? {
??????? JFreeChart jfreechart = ChartFactory.createBarChart("Bar Chart Demo", //圖形標題名稱
??????????????????????????????????????????????????????????? "Category",//domain 軸 Lable
???????????????????????????????????????????????????????????????????????? 這里先簡單理解為橫坐標Lable好了
??????????????????????????????????????????????????????????? "Value", //range 軸 Lable
?????????????????????????????????????????????????????????????????????? 這里也先簡單理解為縱坐標Lable好了
??????????????????????????????????????????????????????????? categorydataset, //? dataset
??????????????????????????????????????????????????????????? PlotOrientation.VERTICAL, //垂直顯示
??????????????????????????????????????????????????????????? true, // legend?
??????????????????????????????????????????????????????????? true,? // tooltips?
??????????????????????????????????????????????????????????? false); //URLs?
??????? jfreechart.setBackgroundPaint(Color.white);?? //設定背景色為白色
??????? CategoryPlot categoryplot = jfreechart.getCategoryPlot(); //獲得 plot：CategoryPlot??！
??????? categoryplot.setBackgroundPaint(Color.lightGray); //設定圖表數據顯示部分背景色
??????? categoryplot.setDomainGridlinePaint(Color.white); //橫坐標網格線白色
??????? categoryplot.setDomainGridlinesVisible(true); //可見
??????? categoryplot.setRangeGridlinePaint(Color.white); //縱坐標網格線白色
??????? //下面兩行使縱坐標的最小單位格為整數
??????? 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?。?br />??????? 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設定上面定義的顏色
??????? barrenderer.setSeriesPaint(1, gradientpaint1); //給series2 Bar 設定上面定義的顏色
??????? barrenderer.setSeriesPaint(2, gradientpaint2); //給series3 Bar 設定上面定義的顏色
??????? 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);???
???????
[b]四、折線圖[/b]
?? 折線圖的dataset 兩種CatagoryDataset接口(具體實現類是DefaultCategoryDataset),XYDataset 接口
?? 1、CatagoryDataset接口：????????
?? A、創建一個數據源（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? 產生 JFreeChart 對象???? (與上面重復的部分就不再注釋）
??? 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（即數據點）可見
??????? 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）點之間的連線 ，這里是虛線，默認是直線
??????? 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）點之間的連線
??????? return jfreechart;
??? }
??????? 一些重要的方法：
??????? lineandshaperenderer.setLineVisible(true)? //series 點（即數據點）間有連線可見
?? 2、XYDataset 接口：
?? A、創建一個數據源（dataset）：
??? private static XYDataset createDataset()
??? {
??????? XYSeries xyseries = new XYSeries("First"); //先產生XYSeries 對象
??????? 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 對象
??????? xyseriescollection.addSeries(xyseries);
??????? xyseriescollection.addSeries(xyseries1);
??????? xyseriescollection.addSeries(xyseries2);
??????? return xyseriescollection;
??? }
?? B、由ChartFactory? 產生 JFreeChart 對象
??? 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); //設定圖表數據顯示部分背景色
??????? xyplot.setAxisOffset(new RectangleInsets(5D, 5D, 5D, 5D)); //設定坐標軸與圖表數據顯示部分距離
??????? xyplot.setDomainGridlinePaint(Color.white); //網格線顏色
??????? xyplot.setRangeGridlinePaint(Color.white);
??????? //獲得 renderer 注意這里是XYLineAndShapeRenderer ！！
??????? XYLineAndShapeRenderer xylineandshaperenderer = (XYLineAndShapeRenderer)xyplot.getRenderer();
??????? xylineandshaperenderer.setShapesVisible(true); //數據點可見
??????? xylineandshaperenderer.setShapesFilled(true); //數據點被填充即不是空心點
??????? 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XYSeries數據點間連線不可見
??????? xylineandshaperenderer.setSeriesShapesVisible(1, false); //第二個XYSeries數據點不可見
??????? xyplot.setRenderer(xylineandshaperenderer);??
???????
[b]五、時間序列圖[/b]
??? 時間序列圖和折線圖很相似，不同的是它在 domain軸的數據是時間而不是數字。 時間序列圖的dataset 是
??? XYDataset 接口，具體實現類是TimeSeriesCollection ，和上面類似，有TimeSeries 對象，它被添加入
??? TimeSeriesCollection 。??????????????????????????????????????????????????????????????????????????????
? 1、創建一個數據源（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軸上的刻度點代表的是時間點而不是時間段
??????? return timeseriescollection;
??? }
?? 2、由ChartFactory? 產生 JFreeChart 對象
??? 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); //數據點可見
??????????? xylineandshaperenderer.setDefaultShapesFilled(true);? //數據點是實心點
??????? }
??????? DateAxis dateaxis = (DateAxis)xyplot.getDomainAxis(); //對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、增加標記線：
??????? xyplot.addRangeMarker(new ValueMarker(550D)); //數值軸
??????? Quarter quarter = new Quarter(2, 2002);
??????? xyplot.addDomainMarker(new ValueMarker(quarter.getMiddleMillisecond()));? //時間軸
???? B、數據點的調整
??????? XYLineAndShapeRenderer xylineandshaperenderer = (XYLineAndShapeRenderer)xyplot.getRenderer();
??????? xylineandshaperenderer.setDefaultShapesVisible(true);? //數據點可見
??????? xylineandshaperenderer.setSeriesFillPaint(0, Color.red);? //數據點填充為紅色
??????? xylineandshaperenderer.setSeriesFillPaint(1, Color.white);? //數據點填充為白色
??????? xylineandshaperenderer.setUseFillPaint(true);??? //應用
???? C、平均值曲線
?????? 這個曲線有什么用呢？很簡單的例子，這里有一個以半年每天為單位的數據繪制的曲線，我們想看看以月為單位數據
?????? 的變化，這時就可以用到它了。
??????? TimeSeries timeseries = createEURTimeSeries();? //就是以半年每天為單位的數據
??????? TimeSeries timeseries1 = MovingAverage.createMovingAverage(timeseries,
?????????????????????????????????????????????????????????????????? "30 day moving average",
?????????????????????????????????????????????????????????????????? 30, //30天為一個周期
?????????????????????????????????????????????????????????????????? 30); //最開始的30天跳過
??????? TimeSeriesCollection timeseriescollection = new TimeSeriesCollection();
??????? timeseriescollection.addSeries(timeseries);
??????? timeseriescollection.addSeries(timeseries1);
??????? return timeseriescollection;
????
[b]六、總結一下[/b]
?????????????????????????? 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 ,主要的類總結如下：
JFreeChart:生成圖表的中間存放類。

[b]七、Item Lable[/b]
?? 這里以柱狀圖為例說明，具體來說就是在每個柱狀上顯示它的數據，具體有下面內容：
?? A、使 Item Lable 可見
?? B、調整 Item Lable 的顏色、字體等
?? C、調整 Item Lable 的位置
?? D、定制 Item Lable 的內容
?? 1、分配一個 Lable Generator 給 renderer
????? BarRenderer barrenderer = (BarRenderer)categoryplot.getRenderer();
????? GategoryLableGenerator generator =new StandardGategoryLableGenerator(
?????????? "{2}", new DecimalFormat("0.00")??? //調整顯示的數字和字符格式
????? );
????? barrenderer.setLableGenerator(generator);
?? 2、使 Item Lable 可見
????? barrenderer.setItemLableVisible(true);
?? 3、調整 Item Lable 的顏色、字體等
????? barrenderer.setItemLablePaint(Color.red);
????? barrenderer.setItemLableFont(new Font("SansSerif",Font.PLAIN,10));
?? 4、調整 Item Lable 的位置
????? 這里涉及到一個新的對象 ItemLablePosition , ItemLablePosition的構造函數有兩個或四個參數
????? 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?。。?br />????? textAnchor - Item Lable里包含的正文相對于Item Lable 的位置
????? rotationAnchor - Item Lable里包含的正文旋轉的位置
????? angle - 旋轉的角度
????? ItemLabelPosition itemlabelposition = new ItemLabelPosition(ItemLabelAnchor.INSIDE12,
????????????????????????????????????????????????????? TextAnchor.CENTER_RIGHT,
????????????????????????????????????????????????????? TextAnchor.CENTER_RIGHT,
????????????????????????????????????????????????????? -1.57D);
????? barrenderer.setPositiveItemLabelPosition(itemlabelposition);
?? 這樣就可以每個柱狀上顯示它的數據了，當然可以定制 Item Lable 的內容，比如 Item Lable text 超過100的才
?? 顯示，這樣就需要定制自己的類，它要實現GategoryLableGenerator 接口，實現generateItemLable()方法。