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                ## 14.2 組合X種類圖區 ### 14.2.1 概述 組合主域種類圖區就是在一個圖區上顯示兩個或者多個子圖區(CategoryPlot實例),共享一個X軸的圖區。每個子圖區維護自己的Y軸。實例如圖14.1所示。 ![](img/jfc86777.png) 如圖14.1 組合X種類圖區(共享X軸) 顯示圖表可以是水平的,也可以是垂直方向的——實例演示的是垂直的圖表。 ### 14.2.2 構建圖表 提供了一個很好的例子,演示如何創建該圖表的類型。關鍵的步驟是創建CombinedDomainCategoryPlot實例,然后添加兩個子圖區: ``` CategoryAxis domainAxis = new CategoryAxis("Category"); CombinedDomainCategoryPlot plot = new CombinedDomainCategoryPlot(domainAxis); plot.add(subplot1, 2); plot.add(subplot2, 1); JFreeChart result = new JFreeChart( "Combined Domain Category Plot Demo", new Font("SansSerif", Font.BOLD, 12), plot, true ); ``` 注意,我們subplot1添加碼值時是2(方法add()的第二個參數),而subplot1添加的是1呢?因為這控制著分配給各個圖區的空間大小。 子圖區的CategoryPlot實例對象將它們的X軸設置為null。例如在演示的實例中,代碼如下: ``` CategoryDataset dataset1 = createDataset1(); NumberAxis rangeAxis1 = new NumberAxis("Value"); rangeAxis1.setStandardTickUnits(NumberAxis.createIntegerTickUnits()); LineAndShapeRenderer renderer1 = new LineAndShapeRenderer(); renderer1.setBaseToolTipGenerator(new StandardCategoryToolTipGenerator()); CategoryPlot subplot1 = new CategoryPlot(dataset1, null, rangeAxis1, renderer1); subplot1.setDomainGridlinesVisible(true); CategoryDataset dataset2 = createDataset2(); NumberAxis rangeAxis2 = new NumberAxis("Value"); rangeAxis2.setStandardTickUnits(NumberAxis.createIntegerTickUnits()); BarRenderer renderer2 = new BarRenderer(); renderer2.setBaseToolTipGenerator(new StandardCategoryToolTipGenerator()); CategoryPlot subplot2 = new CategoryPlot(dataset2, null, rangeAxis2, renderer2); subplot2.setDomainGridlinesVisible(true); ```
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