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                ## 14.5 組合Y-XY圖區 ### 14.5.1 概述 組合Y-XY圖區就是一個圖區顯示兩個或者多個子圖區(XYPlot實例),共享一個Y軸。每一個子圖區維護自己的X軸。如下圖14.4所示. ![](img/jfc91272.png) 圖14.4 組合Y-XY圖區(參見:CombinedXYPlotDemo5.java) 圖區可能水平顯示也可能垂直顯示(本例子中垂直顯示)。 ### 14.5.2 構建圖表 CombinedXYPlotDemo2java實例演示了如何創建該類型的圖表。關鍵的步驟是創建一個實例CombinedRangeXYPlot,并在該實例上添加兩個子圖區: ``` // create the plot... CombinedRangeXYPlot plot = new CombinedRangeXYPlot(new NumberAxis("Value")); plot.add(xyplot, 1); plot.add(xyplot_0_, 1); return new JFreeChart( "Combined (Range) XY Plot", JFreeChart.DEFAULT_TITLE_FONT, plot, true ); ``` 注意兩個圖區的碼值為什么都是1呢?因為該數值控制著每個圖區分配的空間大小。 子圖區是XYPlot實例,將自己的X軸設置為null。例如,下面的代碼演示了這個特征: ``` IntervalXYDataset intervalxydataset = createDataset1(); XYBarRenderer xybarrenderer = new XYBarRenderer(0.2); xybarrenderer.setBaseToolTipGenerator(new StandardXYToolTipGenerator( "{0}: ({1}, {2})", new SimpleDateFormat("d-MMM-yyyy"), new DecimalFormat("0,000.0"))); XYPlot xyplot = new XYPlot(intervalxydataset, new DateAxis("Date"), null, xybarrenderer); XYDataset xydataset = createDataset2(); StandardXYItemRenderer standardxyitemrenderer = new StandardXYItemRenderer(); standardxyitemrenderer .setBaseToolTipGenerator(new StandardXYToolTipGenerator( "{0}: ({1}, {2})", new SimpleDateFormat("d-MMM-yyyy"), new DecimalFormat("0,000.0"))); XYPlot xyplot_0_ = new XYPlot(xydataset, new DateAxis("Date"), null, standardxyitemrenderer); ```
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