Question

描述：我从数据库中获取数据，进行某些计算以获得百分比，然后将百分比添加到addValue方法。计算的百分比例如是双倍百分比= 0.068172;

现在下面是设置上述百分比的代码;

datasetAnnual.addValue(percentage, TTNIConstants.PERNCENTAGE,
                        String.valueOf(year_2));
getAnnualChart(datasetAnnual);

问题是：上述percnetage值最多返回3位十进制数。在这种情况下，数据是0.068。但我需要它达到4位十进制数，即在这种情况下我期待0.0681; 图表显示0.068，但我希望它为0.0681。

addValue（）方法是否只占用最多3位小数？或者我应该写一些额外的代码？

非常感谢您的帮助。

这就是我设置数据集和创建图表的方式

public JFreeChart getAnnualChart(DefaultCategoryDataset datasetAnnual){
        JFreeChart annualChart = ChartFactory.createLineChart(
                "   Title-1", "Title-2", "Title-3",
                datasetAnnual, PlotOrientation.VERTICAL, true, 
                                                            // false)
                false, 
                false 
                );

        System.out.println(datasetAnnual.getValue(0, 0));


        CategoryAxis domainAxis1 = plot1.getDomainAxis();
        domainAxis1.setTickLabelFont(new Font("Arial", Font.BOLD, 12));


        plot1.setDomainGridlinePaint(Color.BLACK);
        plot1.setDomainGridlinesVisible(true);

        plot1.setRangeGridlinePaint(Color.RED);
        plot1.setRangeGridlinesVisible(true);

        plot1.setBackgroundPaint(new Color(204, 255, 153));
        plot1.setOutlineVisible(true);

        plot1.setOutlinePaint(Color.magenta);

        // ValueAxis rangeAxis1 = plot1.getRangeAxis();
        NumberAxis rangeAxis = (NumberAxis) plot1.getRangeAxis();

        //rangeAxis1.setUpperMargin(0.15);

        rangeAxis.setLowerMargin(0.15);

        rangeAxis.setLowerBound(0);

        rangeAxis.setUpperBound(1.095);
        rangeAxis.setTickLabelFont(new Font("Arial", Font.BOLD, 12));
        rangeAxis.setLabelFont(new Font("Arial", Font.BOLD, 12));
        rangeAxis.setAutoRangeMinimumSize(4);
        rangeAxis.setTickUnit(new NumberTickUnit(0.1, new DecimalFormat("##,##,##0%")));
        annualChart.getLegend().setPosition(RectangleEdge.RIGHT);
        LineAndShapeRenderer renderer1 = new LineAndShapeRenderer();
        renderer1.setBaseOutlinePaint(Color.ORANGE);
        renderer1.setDrawOutlines(true);

        renderer1.setBaseItemLabelGenerator(new StandardCategoryItemLabelGenerator());
        renderer1.setBaseItemLabelsVisible(true);
        /*renderer1.setItemLabelGenerator(new StandardCategoryItemLabelGenerator("{2}"
                , NumberFormat.getNumberInstance()));*/
        renderer1.setBaseItemLabelFont(new Font("bold", Font.CENTER_BASELINE,
                12));
        renderer1.setBaseItemLabelPaint(Color.BLUE);
        renderer1.setBasePositiveItemLabelPosition(new ItemLabelPosition(
                ItemLabelAnchor.OUTSIDE12, TextAnchor.BOTTOM_CENTER));
        plot1.setRenderer(renderer1);

        return annualChart;

     }

JFreeChart：DefaultCategoryDataset addValue仅添加最多3个小数点

0 个答案: