jfreechart 柱图常用设置方法
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下面的柱图实例包括了大多数的柱图类设置
?
?文件名称:index.jsp
?
<%@ page contentType="text/html;charset=GBK"%>
<%@ page import="java.awt.Color,
??????????????? org.jfree.chart.ChartFactory,
??????????????? org.jfree.chart.JFreeChart,
??????????????? org.jfree.chart.plot.PlotOrientation,
??????????????? org.jfree.chart.servlet.ServletUtilities,
??????????????? org.jfree.data.category.CategoryDataset,
??????????????? org.jfree.data.general.*,
??????????????? org.jfree.chart.plot.CategoryPlot,
??????????????? org.jfree.chart.axis.CategoryAxis,
??????????????? org.jfree.chart.axis.ValueAxis,
??????????????? org.jfree.chart.renderer.category.BarRenderer3D,
??????????????? org.jfree.chart.urls.StandardCategoryURLGenerator,
??????????????? org.jfree.chart.*,
??????????????? org.jfree.chart.entity.*,
??????????????? org.jfree.chart.labels.*,
??????????????? org.jfree.chart.axis.CategoryLabelPositions,
??????????????? java.awt.Font,
??????????????? java.awt.GradientPaint,
??????????????? org.jfree.ui.TextAnchor,
??????????????? org.jfree.chart.axis.NumberAxis,
??????????????? org.jfree.chart.axis.NumberTickUnit???????????????
??????????????? "%>
<%
java.io.PrintWriter pw=new java.io.PrintWriter(out);
double[][] data = new double[][] {{500}, {200}, {100}, {400}, {600}, {300}};
String[] rowKeys = {"苹果", "梨子", "葡萄", "桔子", "西瓜", "香蕉"};
String[] columnKeys = {""};
CategoryDataset dataset = DatasetUtilities.createCategoryDataset(
??????? rowKeys,
??????? columnKeys,
??????? data);
JFreeChart chart = ChartFactory.createBarChart3D("水果销量图统计",
????????????????? "水果",? //横坐标名称
????????????????? "销量",? //纵坐标名称
????????????????? dataset,//数据集合
????????????????? PlotOrientation.VERTICAL,//图形位置，水平还是垂直
????????????????? true,
????????????????? false,
????????????????? false);
?????? chart.setBackgroundPaint(Color.WHITE);??
?????? //设定背景色为白色
??????
?????? CategoryPlot categoryPlot = chart.getCategoryPlot();?
?????? //获得 plot：3dBar为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);
?????? //设置网格线可见
??????
?????? categoryPlot.setRangeGridlinePaint(Color.white);
?????? //纵坐标网格线白色
????
?????? //获取横坐标
?????? CategoryAxis domainAxis = categoryPlot.getDomainAxis();
??????
?????? //设置 横坐标 垂直显示
?????? //domainAxis.setCategoryLabelPositions(CategoryLabelPositions.createUpRotationLabelPositions(0.4));
??????
?????? //获取纵坐标
?????? NumberAxis numberaxis = (NumberAxis)categoryPlot.getRangeAxis();?
?????? //将纵坐标间距设置为50
?????? numberaxis.setTickUnit(new NumberTickUnit(50));
?????? //设置横坐标的标题字体和大小,此处是“宋体13号”
?????? domainAxis.setLabelFont(new Font("宋体",Font.PLAIN,13));
??????
?????? //设置距离图片左端距离,参数为图片的百分比
?????? domainAxis.setLowerMargin(0.05);
??????
?????? //设置距离图片右端距离
?????? domainAxis.setUpperMargin(0.05);
??????????
?????? //设置横坐标的坐标值的字体
?????? domainAxis.setTickLabelFont(new Font("宋体",Font.PLAIN,12));
?????? //使横坐标设置生效
?????? categoryPlot.setDomainAxis(domainAxis);
???????????
?????? ValueAxis rangeAxis = categoryPlot.getRangeAxis();
?????? //设置最高的一个柱与图片顶端的距离
?????? rangeAxis.setUpperMargin(0.05);
??????
?????? //设置最低的一个柱与图片底端的距离
?????? rangeAxis.setLowerMargin(0.05);
?????? categoryPlot.setRangeAxis(rangeAxis);
??????
?????? //设置竖坐标标签的旋转角度
?????? rangeAxis.setLabelAngle(0.05);
??????
?????? //重要的类，负责生成各种效果
?????? BarRenderer3D renderer=(BarRenderer3D) categoryPlot.getRenderer();
??????
?????? //设置 Wall 的颜色
?????? renderer.setWallPaint(Color.PINK);
??????
?????? //设置每个柱的颜色????
?????? 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));
?
?????? renderer.setSeriesPaint(0, gradientpaint);
?????? renderer.setSeriesPaint(1, gradientpaint1);
??????
?????? //设置柱的 Outline 颜色
?????? renderer.setSeriesOutlinePaint(0, Color.BLACK);
?????? renderer.setSeriesOutlinePaint(1, Color.BLACK);
?????? //设置每个category所包含的平行柱的之间距离
?????? renderer.setItemMargin(0.1);
???
?????? //显示每个柱的数值，并修改该数值的字体属性
?????? renderer.setItemLabelGenerator(new StandardCategoryItemLabelGenerator());
??????? //以下设置，将按照指定格式，制定内容显示每个柱的数值。可以显示柱名称，所占百分比
?????? //renderer.setBaseItemLabelGenerator(new StandardCategoryItemLabelGenerator("{2}",new DecimalFormat("0.0%")));???
?
?????? //设置柱子上数值的字体
?????? renderer.setItemLabelFont(new Font("宋体",Font.PLAIN,13));?
?????? renderer.setItemLabelsVisible(true);
????
?????? //设置柱子上数据的颜色
?????? renderer.setItemLabelPaint(Color.RED);
??????
?????? //设置bar的最小宽度，以保证能显示数值
?????? renderer.setMinimumBarLength(0.02);
??????
?????? //最大宽度
?????? //renderer.setMaximumBarWidth(0.07);
??????
?????? //设置柱子上比例数值的显示，如果按照默认方式显示，数值为方向正常显示
?????? //设置柱子上显示的数据旋转90度,最后一个参数为旋转的角度值/3.14
???????? ItemLabelPosition itemLabelPosition= new ItemLabelPosition(
???????? ItemLabelAnchor.INSIDE12,TextAnchor.CENTER_RIGHT,
???????? TextAnchor.CENTER_RIGHT,-1.57D);
??????
?????? //下面的设置是为了解决，当柱子的比例过小，而导致表示该柱子比例的数值无法显示的问题
?????? //设置不能在柱子上正常显示的那些数值的显示方式，将这些数值显示在柱子外面
???????? ItemLabelPosition itemLabelPositionFallback=new ItemLabelPosition(
???????? ItemLabelAnchor.OUTSIDE12,TextAnchor.BASELINE_LEFT,
???????? TextAnchor.HALF_ASCENT_LEFT,-1.57D);
??????
?????? //设置正常显示的柱子label的position
?????? renderer.setPositiveItemLabelPosition(itemLabelPosition);
?????? renderer.setNegativeItemLabelPosition(itemLabelPosition);
??????
?????? //设置不能正常显示的柱子label的position
?????? renderer.setPositiveItemLabelPositionFallback(itemLabelPositionFallback);
?????? renderer.setNegativeItemLabelPositionFallback(itemLabelPositionFallback);
??????
?????? categoryPlot.setRenderer(renderer);
?????? //设置柱子的透明度
?????? categoryPlot.setForegroundAlpha(0.8f);
??????
???????? //为柱图设置“数据挖陷”
???????? //第一个参数是跳转的连接地址
???????? renderer.setBaseItemURLGenerator(new StandardCategoryURLGenerator(
??????? "detail.jsp", "fruit", ""));
??????? //使设置生效
???????? renderer.setBaseItemLabelsVisible(true);
??????? //设置柱的透明度
???????? categoryPlot.setForegroundAlpha(0.5f);
??????? //设置地区、销量的显示位置
???????? //plot.setRangeAxisLocation(AxisLocation.BOTTOM_OR_RIGHT);
???????? ChartRenderingInfo info = new ChartRenderingInfo(new StandardEntityCollection());
???????? //生成图形的名称
???????? //可以改变ServletUtilities源代码，设置图形统一前缀名称和默认存放路径
???????? //注意：图形的大小往往都是通过配置文件设置的，不可能所有图形一个大小
???????? String filename = ServletUtilities.saveChartAsPNG(chart, 800, 600, info, session);
???????? //调用DisplayChart（配置在webxml中），生成图形
???????? String graphURL = request.getContextPath() + "/DisplayChart?filename=" + filename;
???????? //将MAP信息，写入图形
???????? ChartUtilities.writeImageMap(pw, filename, info, true);
???????? pw.flush();
%>
<table width="100%">
??? <tr>
??????? <td align="center">
??????????? <!-- 生成图形 -->
??????????? <img src="<%= graphURL %>" width=800 height=600 border=0 usemap="#<%= filename %>" alt="jfreechart 柱图惯用设置方法">
??????? </td>
??? </tr>
</table>
