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JFreeChart柱状图单组柱子的不同颜色显示

时间:2015-10-29 18:04:41      阅读:200      评论:0      收藏:0      [点我收藏+]

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JFreeChart柱状图中单组柱子用不同颜色来显示的实现方法是自定义一个Renderer来继承BarRenderer类,然后重载getItemPaint(int i,int j)方法。

实现效果如下:

技术分享

实现代码如下:

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public class CustomRenderer extends org.jfree.chart.renderer.category.BarRenderer { 
   
    /** 
     *  
     */ 
    private static final long serialVersionUID = 784630226449158436L; 
    private Paint[] colors; 
    //初始化柱子颜色 
    private String[] colorValues = { "#AFD8F8""#F6BD0F""#8BBA00""#FF8E46""#008E8E""#D64646" }; 
   
    public CustomRenderer() { 
        colors = new Paint[colorValues.length]; 
        for (int i = 0; i < colorValues.length; i++) { 
            colors[i] = Color.decode(colorValues[i]); 
        
    
   
    //每根柱子以初始化的颜色不断轮循 
    public Paint getItemPaint(int i, int j) { 
        return colors[j % colors.length]; 
    
}
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public class CreateJFreeChartBarColor { 
   
    /** 
     * 创建JFreeChart Bar Chart(柱状图) 
     */ 
    public static void main(String[] args) { 
        // 步骤1:创建CategoryDataset对象(准备数据) 
        CategoryDataset dataset = createDataset(); 
        // 步骤2:根据Dataset 生成JFreeChart对象,以及做相应的设置 
        JFreeChart freeChart = createChart(dataset); 
        // 步骤3:将JFreeChart对象输出到文件,Servlet输出流等 
        saveAsFile(freeChart, "E:\\bar.png"500400); 
    
   
    // 保存为文件 
    public static void saveAsFile(JFreeChart chart, String outputPath, int weight, int height) { 
        FileOutputStream out = null
        try
            File outFile = new File(outputPath); 
            if (!outFile.getParentFile().exists()) { 
                outFile.getParentFile().mkdirs(); 
            
            out = new FileOutputStream(outputPath); 
            // 保存为PNG文件 
            ChartUtilities.writeChartAsPNG(out, chart, weight, height); 
            out.flush(); 
        catch (FileNotFoundException e) { 
            e.printStackTrace(); 
        catch (IOException e) { 
            e.printStackTrace(); 
        finally
            if (out != null) { 
                try
                    out.close(); 
                catch (IOException e) { 
                    // do nothing 
                
            
        
    
   
    // 根据CategoryDataset生成JFreeChart对象 
    public static JFreeChart createChart(CategoryDataset categoryDataset) { 
        JFreeChart jfreechart = ChartFactory.createBarChart("学生统计图"// 标题 
                "学生姓名"// categoryAxisLabel (category轴,横轴,X轴的标签) 
                "年龄"// valueAxisLabel(value轴,纵轴,Y轴的标签) 
                categoryDataset, // dataset 
                PlotOrientation.VERTICAL, false// legend 
                false// tooltips 
                false); // URLs 
   
        Font labelFont = new Font("SansSerif", Font.TRUETYPE_FONT, 12); 
   
        jfreechart.setTextAntiAlias(false); 
        jfreechart.setBackgroundPaint(Color.white); 
   
        CategoryPlot plot = jfreechart.getCategoryPlot();// 获得图表区域对象 
   
        // 设置横虚线可见 
        plot.setRangeGridlinesVisible(true); 
        // 虚线色彩 
        plot.setRangeGridlinePaint(Color.gray); 
        // 数据轴精度 
        NumberAxis vn = (NumberAxis) plot.getRangeAxis(); 
        // vn.setAutoRangeIncludesZero(true); 
        DecimalFormat df = new DecimalFormat("#0.0"); 
        vn.setNumberFormatOverride(df); // 数据轴数据标签的显示格式 
   
        // x轴设置 
        CategoryAxis domainAxis = plot.getDomainAxis(); 
        domainAxis.setLabelFont(labelFont);// 轴标题 
        domainAxis.setTickLabelFont(labelFont);// 轴数值 
        // Lable(Math.PI/3.0)度倾斜 
        // domainAxis.setCategoryLabelPositions(CategoryLabelPositions 
        // .createUpRotationLabelPositions(Math.PI / 3.0)); 
        domainAxis.setMaximumCategoryLabelWidthRatio(6.00f);// 横轴上的 Lable 
        // 是否完整显示 
   
        // 设置距离图片左端距离 
        domainAxis.setLowerMargin(0.1); 
        // 设置距离图片右端距离 
        domainAxis.setUpperMargin(0.1); 
        // 设置 columnKey 是否间隔显示 
        // domainAxis.setSkipCategoryLabelsToFit(true); 
        plot.setDomainAxis(domainAxis); 
        // 设置柱图背景色(注意,系统取色的时候要使用16位的模式来查看颜色编码,这样比较准确) 
        plot.setBackgroundPaint(new Color(255255204)); 
   
        // y轴设置 
        ValueAxis rangeAxis = plot.getRangeAxis(); 
        rangeAxis.setLabelFont(labelFont); 
        rangeAxis.setTickLabelFont(labelFont); 
        // 设置最高的一个 Item 与图片顶端的距离 
        rangeAxis.setUpperMargin(0.15); 
        // 设置最低的一个 Item 与图片底端的距离 
        rangeAxis.setLowerMargin(0.15); 
        plot.setRangeAxis(rangeAxis); 
   
        // 解决中文乱码问题(关键) 
        TextTitle textTitle = jfreechart.getTitle(); 
        textTitle.setFont(new Font("黑体", Font.PLAIN, 20)); 
        domainAxis.setTickLabelFont(new Font("sans-serif", Font.PLAIN, 11)); 
        domainAxis.setLabelFont(new Font("宋体", Font.PLAIN, 12)); 
        vn.setTickLabelFont(new Font("sans-serif", Font.PLAIN, 12)); 
        vn.setLabelFont(new Font("黑体", Font.PLAIN, 12)); 
        // jfreechart.getLegend().setItemFont(new Font("宋体", Font.PLAIN, 12)); 
   
        // 使用自定义的渲染器 
                CustomRenderer renderer = new CustomRenderer(); 
        // 设置柱子宽度 
        renderer.setMaximumBarWidth(0.2); 
        // 设置柱子高度 
        renderer.setMinimumBarLength(0.2); 
        // 设置柱子边框颜色 
        renderer.setBaseOutlinePaint(Color.BLACK); 
        // 设置柱子边框可见 
        renderer.setDrawBarOutline(true); 
        // 设置每个地区所包含的平行柱的之间距离 
        renderer.setItemMargin(0.5); 
        jfreechart.getRenderingHints().put(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_OFF); 
        // 显示每个柱的数值,并修改该数值的字体属性 
        renderer.setIncludeBaseInRange(true); 
        renderer.setBaseItemLabelGenerator(new StandardCategoryItemLabelGenerator()); 
        renderer.setBaseItemLabelsVisible(true); 
        plot.setRenderer(renderer); 
        // 设置柱的透明度 
        plot.setForegroundAlpha(1.0f); 
   
        // 背景色 透明度 
        plot.setBackgroundAlpha(0.5f); 
   
        return jfreechart; 
    
   
    // 创建CategoryDataset对象 
    public static CategoryDataset createDataset() { 
        double[][] data = new double[][] { { 252440123333 } }; 
        String[] rowKeys = { "" }; 
        String[] columnKeys = { "张三""李四""王五""马六""陈七""赵八" }; 
        CategoryDataset dataset = DatasetUtilities.createCategoryDataset(rowKeys, columnKeys, data); 
        return dataset; 
    
   
}

JFreeChart柱状图单组柱子的不同颜色显示

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原文地址:http://www.cnblogs.com/love540376/p/4921175.html

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