JFreeChart柱状图的完整实例

JFreeChart柱状图的完整实例

2010-12-15 17:50

import java.awt.Color; import java.awt.Dimension; import java.awt.GradientPaint; import org.jfree.chart.ChartFactory; import org.jfree.chart.ChartPanel; import org.jfree.chart.JFreeChart; import org.jfree.chart.axis.NumberAxis; import org.jfree.chart.labels.StandardCategoryItemLabelGenerator; import org.jfree.chart.plot.CategoryPlot; import org.jfree.chart.plot.PlotOrientation; import org.jfree.chart.renderer.category.BarRenderer; import org.jfree.chart.renderer.category.CategoryItemRenderer; import org.jfree.data.category.CategoryDataset; import org.jfree.data.category.DefaultCategoryDataset; import org.jfree.ui.ApplicationFrame; import org.jfree.ui.RefineryUtilities; public class AliHorizonBarChartDemo extends ApplicationFrame{    public AliHorizonBarChartDemo(String s){   //这里是继承自ApplicationFrame   super(s);   //创建Dataset   CategoryDataset categoryDataset=createDataset();   //创建jfreechart   JFreeChart jfreechart=createChart(categoryDataset);   //创建容器   ChartPanel chartPanel=createPanel();   //设置容器的初始大小(Dimension是用来设置尺寸的)   chartPanel.setPreferredSize(new Dimension(400,200));//尤其注意的是panel的高度会严重影响柱体的宽度   //下面这句是关键,控制是否显示，也就是将整个组件放入到组件中去   /**    * 对JFrame添加组件有两种方式： 　　        1)用getContentPane()方法获得JFrame的内容面板，再对其加入组件：frame.getContentPane().add(childComponent) 　         　2)建立一个Jpanel或JDesktopPane之类的中间容器，把组件添加到容器中，用setContentPane()方法把该容器置为JFrame的内容                    面板： 　           　　　JpanelcontentPane=newJpanel();//把其它组件添加到Jpanel中; 　　　           　frame.setContentPane(contentPane);　//把contentPane对象设置成为frame的内容面板    */      setContentPane(chartPanel);  }  public CategoryDataset createDataset(){   System.out.println("========createDataSet========");   //创建Dataset   DefaultCategoryDataset defaultDataset=new DefaultCategoryDataset();   //创建分类   defaultDataset.addValue(100d, "S1","Apple" );   defaultDataset.addValue(101d, "S1", "banana");   defaultDataset.addValue(150d, "S1", "grape");   defaultDataset.addValue(12d,"S1","pear");      return defaultDataset;     }  public JFreeChart createChart(CategoryDataset dataset){   System.out.println("===========createJfreechart========");   //创建jfreechart         JFreeChart jfreechart=ChartFactory.createBarChart("Ali's fruits","type","number",dataset,PlotOrientation.HORIZONTAL,false,true,false);          //设置jfreechart的背景         System.out.println("jfreechart="+jfreechart);         jfreechart.setBackgroundPaint(Color.yellow);                 //创建plot         CategoryPlot categoryPlot=(CategoryPlot)jfreechart.getPlot();         System.out.println("categoryPlot="+categoryPlot);         //设置场景的背景色         categoryPlot.setBackgroundPaint(Color.gray);         //还可以设置场景的横向网格         categoryPlot.setDomainGridlinePaint(Color.red);         //设置场景横向网格的可见性，如果不设置的话则不可见         categoryPlot.setDomainGridlinesVisible(true);         //设置场景的竖向网格         categoryPlot.setRangeGridlinePaint(Color.green);         //设置最长的说明标签的显示比例         System.out.println(categoryPlot.getDomainAxis());         categoryPlot.getDomainAxis().setMaximumCategoryLabelWidthRatio(0.8F);                 //设置轴         NumberAxis numberAxis=(NumberAxis)categoryPlot.getRangeAxis();         //设置轴的单位         numberAxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());                 //添加额外的效果(表示器)         BarRenderer barrender=(BarRenderer)categoryPlot.getRenderer();         //设置是否显示外框         barrender.setDrawBarOutline(true);         //显示每个柱子的具体值         //下面这两句缺一不可         barrender.setBaseItemLabelGenerator(new StandardCategoryItemLabelGenerator());         barrender.setSeriesItemLabelsVisible(0, Boolean.TRUE);         //添加渐变色         GradientPaint gradientPaint=new GradientPaint(0.0f,0.0f,new Color(255,255,255),0.0f,0.0f,new Color(170,170,255));         //给柱体上色         barrender.setSeriesPaint(0,gradientPaint);        return jfreechart;  }  public  ChartPanel createPanel(){   JFreeChart jfreechart = createChart(createDataset());   return new ChartPanel(jfreechart);     }  public static void main(String[] args){   AliHorizonBarChartDemo demo=new AliHorizonBarChartDemo("ALI's bar chart");   demo.pack();   RefineryUtilities.centerFrameOnScreen(demo);   demo.setVisible(true);   demo.setDefaultCloseOperation(1);     } }