JFreechart刻度单位 [英] JFreechart tick units

问题描述

我正在使用以下代码，这些代码是我从网上发布的

I am using the following code which i got off the web

TickUnits units = new TickUnits();
DecimalFormat df1 = new DecimalFormat("$0");
DecimalFormat df2 = new DecimalFormat("$0.00");

// we can add the units in any order, the TickUnits collection will
// sort them...
units.add(new NumberTickUnit(100, df1, 0));
units.add(new NumberTickUnit(50, df1, 0));
units.add(new NumberTickUnit(20, df1, 0));
units.add(new NumberTickUnit(10, df1, 0));
units.add(new NumberTickUnit(5, df1, 0));
units.add(new NumberTickUnit(2, df1, 0));
units.add(new NumberTickUnit(1, df1, 0));

由于我是个新手，所以我不理解这段代码的实际作用.我以为它会在 y 轴上设置值，但事实并非如此，因为在 y 轴上有超过100美元的值.这段代码究竟是做什么的. (准确的是刻度单位.它是在轴上定义了标签还是在这里我弄错了?)

As I am very new, I don't understand what this piece of code actually does. I Thought that it sets the values on the y axis, but that does not seem to be the case as there are values exceeding 100 dollars on the y axis. What exactly does this piece of code do. (Also what exactly is tick units. Does it define the labels on the axes or am I mistaken here).

推荐答案

是的，TickUnits定义了Axis标签的格式，但是完整的说明超出了Stackoverflow的范围. 开发人员指南 ^†具有决定性，但可以证明有助于检查为特定Axis子类返回TickUnitSource的方法.例如，NumberAxis中的"nofollow noreferrer> createIntegerTickUnits() ，以及

Yes, TickUnits define the format of Axis labels, but a complete explication is beyond the scope of Stackoverflow. The developer guide^† is dispositive, but it may prove instructive to examine the methods that return a TickUnitSource for a particular Axis subclass. For example, the source code for createIntegerTickUnits() in NumberAxis, along with NumberTickUnitSource

引用的示例存在缺陷，因为它忽略了用户的语言环境.

The example cited is flawed in that it ignores the user's locale.

附录:如果要使用本地化的货币格式，请覆盖默认的Number格式程序.

Addendum: If you want localized currency format, override the default Number formatter.

XYPlot plot = chart.getXYPlot();
NumberAxis range = (NumberAxis) plot.getRangeAxis();
range.setNumberFormatOverride(NumberFormat.getCurrencyInstance());

^† _{免责声明:不隶属于Object Refinery Limited；只是一个满意的客户，贡献很小.}

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