| 柱状图 柱状图的dataset 一般是用CatagoryDataset接口(具体实现类是DefaultCategoryDataset),也会用 IntervalXYDataset 接口 1、创建一个数据源（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 产生 JFreeChart 对象 private static JFreeChart createChart(CategoryDataset categorydataset) { JFreeChart jfreechart = ChartFactory.createBarChart("Bar Chart Demo", //图形标题名称 "Category",//domain 轴 Lable 这里先简单理解为横坐标Lable好了 "Value", //range 轴 Lable 这里也先简单理解为纵坐标Lable好了 categorydataset, // dataset PlotOrientation.VERTICAL, //垂直显示 true, // legend? true, // tooltips? false); //URLs? jfreechart.setBackgroundPaint(Color.white); //设定背景色为白色 CategoryPlot categoryplot = jfreechart.getCategoryPlot(); //获得 plot：CategoryPlot！！ categoryplot.setBackgroundPaint(Color.lightGray); //设定图表数据显示部分背景色 categoryplot.setDomainGridlinePaint(Color.white); //横坐标网格线白色 categoryplot.setDomainGridlinesVisible(true); //可见 categoryplot.setRangeGridlinePaint(Color.white); //纵坐标网格线白色 //下面两行使纵坐标的最小单位格为整数 NumberAxis numberaxis = (NumberAxis)categoryplot.getRangeAxis(); numberaxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits()); BarRenderer barrenderer = (BarRenderer)categoryplot.getRenderer(); //获得renderer 注意这里是下嗍造型 到BarRenderer！！ barrenderer.setDrawBarOutline(false); // Bar的外轮廓线不画 GradientPaint gradientpaint = new GradientPaint(0.0F, 0.0F, Color.blue, 0.0F, 0.0F, new Color(0, 0, 64)); //设定特定颜色 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); //给series1 Bar设定上面定义的颜色 barrenderer.setSeriesPaint(1, gradientpaint1); //给series2 Bar 设定上面定义的颜色 barrenderer.setSeriesPaint(2, gradientpaint2); //给series3 Bar 设定上面定义的颜色 CategoryAxis categoryaxis = categoryplot.getDomainAxis(); //横轴上的 Lable 45度倾斜 categoryaxis.setCategoryLabelPositions(CategoryLabelPositions.UP_45); return jfreechart; } 一些重要的方法：（增加一块标记） 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); |
