JFReeChart x轴缩放 [英] JFReeChart x axis scale

问题描述

我有一个始终从x = 0开始的JFree XY线图。然后根据属性文件中的用户定义设置，应用程序基于该数字递增（这代表以分钟为单位的时间）。

例如，x = 0以启动用户定义的设置为5 - 因此刻度变为0,5,10,15,20 ....或者用户设置为3，因此变为0， 3，6，9，12 ......

很简单。

图表开始的方式就是这样。如果我从0开始，那么0在图的中间，而不是在-0.0000005，-0.000004，-0.000003 ..... 0.000000，0.000001，0.000002 ...... 0.000005

我怎样才能在底部手动添加比例，即定义它应该是2的增量，然后它保持它？

感谢您的时间

解决方案

您应该使用 NumberAxis ，其中包含许多方法来定义图表的比例。

示例：

  //创建XY折线图
 XYSeries series = new XYSeries（Random Data）; 
 series.add（1.0，500.2）; 
 series.add（10.0，694.1）; 
 XYSeriesCollection data = new XYSeriesCollection（series）; 
 JFreeChart chart = ChartFactory.createXYLineChart（XY Series Demo，X，Y，data，
 PlotOrientation.VERTICAL，
 true，true，false）; 
 
 //创建一个NumberAxis 
 NumberAxis xAxis = new NumberAxis（）; 
 xAxis.setTickUnit（new NumberTickUnit（2））; 
 
 //将它分配给图表
 XYPlot plot =（XYPlot）chart.getPlot（）; 
 plot.setDomainAxis（xAxis）; 
  

I have a JFree XY Line chart which always starts at x = 0. Then based on user defined settings from a properties file the application increments based on that number (this represents the time in minutes)

For example x = 0 to start the user defined setting is 5 - so the scale goes 0, 5, 10, 15, 20.... or the user setting is 3 so it goes 0, 3, 6, 9, 12......

pretty simple.

The issue i am having is the way in which the graph starts. If i start at 0, then 0 is in the middle of the graph rather than at the bottom left with -0.0000005, -0.000004, -0.000003..... 0.000000 , 0.000001 , 0.000002...... 0.000005

how can i just manually add the scale at the bottom, ie define it should be incrememnts of 2 and then it maintains it?

Thanks for your time

解决方案

You should use NumberAxis, which contains a lot of methods to define the scale of your chart.

Example :

// Create an XY Line chart
XYSeries series = new XYSeries("Random Data");
series.add(1.0, 500.2);
series.add(10.0, 694.1);
XYSeriesCollection data = new XYSeriesCollection(series);
JFreeChart chart = ChartFactory.createXYLineChart("XY Series Demo", "X", "Y", data,
                                                  PlotOrientation.VERTICAL, 
                                                  true, true, false);

// Create an NumberAxis
NumberAxis xAxis = new NumberAxis();
xAxis.setTickUnit(new NumberTickUnit(2));

// Assign it to the chart
XYPlot plot = (XYPlot) chart.getPlot();
plot.setDomainAxis(xAxis);

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