Y 轴在 JFreeChart 中未显示百万和十亿的正确数字

Question

在使用 JFreeChart 生成条形图时，我得到了数十亿和数百万的科学数字格式的值，可读性较低，

有什么方法可以让我像使用JfreeChart一样获取值。

它必须是动态的百万，数十亿的所有价值。任何帮助将不胜感激。

Answer 1

也许您可以创建自己的自定义 TickUnits, as this other post 建议。

Answer 2

使用调用 setNumberFormatOverride() on your plot's NumberAxis, as shown . You'll need a custom NumberFormat, possibly using one of the approach shown here or here.

Answer 3

感谢@Haroldo_OK 和@trashgod 的提示，最后我得到了相同的解决方案，它给了我预期的结果。

final long MILLION = 1000000L;
    final long BILLION = 1000000000L;
    final long TRILLION = 1000000000000L;
    final long THOUSAND = 1000L;

    NumberAxis rangeAxis = (NumberAxis) plot.getRangeAxis();
    rangeAxis.setNumberFormatOverride(new NumberFormat() {

        @Override
        public Number parse(String source, ParsePosition parsePosition) {
            return null;
        }

        @Override
        public StringBuffer format(long number, StringBuffer toAppendTo, FieldPosition pos) {

            String temp =  number < THOUSAND ? String.valueOf(number) :
                number < MILLION ?  (int)(number / THOUSAND) + " K" :
                number < BILLION ?  (int)(number / MILLION) + " M" :
                number < TRILLION ? (int)(number / BILLION) + " B" : 
                (int)(number / TRILLION) + " T";
            return new StringBuffer(temp);
        }

        @Override
        public StringBuffer format(double number, StringBuffer toAppendTo, FieldPosition pos) {

            String temp =  number < THOUSAND ? String.valueOf(number) :
                number < MILLION ?  (int)(number / THOUSAND) + " K" :
                number < BILLION ?  (int)(number / MILLION) + " M" :
                number < TRILLION ? (int)(number / BILLION) + " B" : 
                (int)(number / TRILLION) + " T";
            return new StringBuffer(temp);
        }
    });

Y 轴在 JFreeChart 中未显示百万和十亿的正确数字

Y Axis is not displaying correct figure for Millions and Billions in JFreeChart

java

jfreechart