JFreechart:以特定单位后的值显示X轴 [英] JFreechart: Displaying X axis with values after specific units

问题描述

我正在使用jfreechart显示折线图，现在在X轴上显示图表上每个(x，y)对的值，结果X轴上有大量重叠的值，我只想显示几个值，例如每5个单位之后或类似的值.使用Jfreechart怎么可能.

I am using jfreechart for displaying line graph.Now, on X axis it shows value for every (x,y) pair on chart.As a result the X axis has huge amount of values getting overlapped.I want to display few values eg after every 5 units or something like that.How is this possible using Jfreechart.

推荐答案

在绘制图表的NumberAxis之前，将刷新其刻度线.结果是List，其中每个轴的刻度线都包含一个NumberTick对象.

Before the NumberAxis of the chart's plot is drawn, its tick marks are refreshed. The result is a List that includes a NumberTick object for each tick mark of the axis.

通过覆盖功能NumberAxis.refreshTicks，您可以控制标记的显示方式和显示方式.

By overriding the function NumberAxis.refreshTicks you can control how and if the marks will be shown.

例如，在下面的代码中，我获得了所有刻度线并对其进行迭代以查找TickType.MAJOR.如果不能将主要刻度线的值除以5，则将其替换为次要刻度线.

For example, in the following code I get all tick marks and iterate through them looking for TickType.MAJOR. If the value of a major tick mark is not dividable by 5, it gets replaced by a minor tick mark.

结果是，只有可除以5的值会显示在其文本标签中.

As a result, only values dividable by 5 will be shown with their text label.

XYPlot plot = (XYPlot) chart.getPlot();

NumberAxis myAxis = new NumberAxis(plot.getDomainAxis().getLabel()) {
  @Override
  public List refreshTicks(Graphics2D g2, AxisState state,
                           Rectangle2D dataArea, RectangleEdge edge) {

    List allTicks = super.refreshTicks(g2, state, dataArea, edge);
    List myTicks = new ArrayList();

    for (Object tick : allTicks) {
      NumberTick numberTick = (NumberTick) tick;

      if (TickType.MAJOR.equals(numberTick.getTickType()) &&
                    (numberTick.getValue() % 5 != 0)) {
        myTicks.add(new NumberTick(TickType.MINOR, numberTick.getValue(), "",
                    numberTick.getTextAnchor(), numberTick.getRotationAnchor(),
                    numberTick.getAngle()));
        continue;
      }
      myTicks.add(tick);
    }
    return myTicks;
  }
};

plot.setDomainAxis(myAxis);

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