我的x軸整數值前綴爲「19:00:00」。

我是jFreeChart的新手。我正嘗試運行隨下載提供的示例代碼。它工作正常。我想在x軸上顯示整數值。我改變了程序來使用NumberAxis而不是DateAxis。但是，當我生成圖形時，它會顯示以「19:00:00」爲前綴的整數x值。（應該是5,10，但是顯示的是19:00:00:00，19:00:00:00）。我在這裏做錯了什麼？我的x軸整數值前綴爲「19:00:00」。

import java.awt.Color; 
import java.text.SimpleDateFormat; 
import java.io.File; 
import javax.swing.JPanel; 

import org.jfree.chart.ChartFactory; 
import org.jfree.chart.ChartPanel; 
import org.jfree.chart.JFreeChart; 
import org.jfree.chart.StandardChartTheme; 
import org.jfree.chart.axis.DateAxis; 
import org.jfree.chart.axis.NumberAxis; 
import org.jfree.chart.plot.XYPlot; 
import org.jfree.chart.renderer.xy.XYItemRenderer; 
import org.jfree.chart.renderer.xy.XYLineAndShapeRenderer; 
import org.jfree.data.time.Month; 
import org.jfree.data.xy.XYSeries; 
import org.jfree.data.xy.XYSeriesCollection; 
import org.jfree.data.xy.XYDataset; 
import org.jfree.ui.ApplicationFrame; 
import org.jfree.ui.RectangleInsets; 
import org.jfree.ui.RefineryUtilities; 
import org.jfree.chart.ChartUtilities; 

/** 
* An example of a time series chart. For the most part, default settings are 
* used, except that the renderer is modified to show filled shapes (as well as 
* lines) at each data point. 
*/ 
public class PlotExample3 extends ApplicationFrame { 

    private static final long serialVersionUID = 1L; 

    { 
     // set a theme using the new shadow generator feature available in 
     // 1.0.14 - for backwards compatibility it is not enabled by default 
     ChartFactory.setChartTheme(new StandardChartTheme("JFree/Shadow", 
       true)); 
    } 

    /** 
    * A demonstration application showing how to create a simple time series 
    * chart. This example uses monthly data. 
    * 
    * @param title the frame title. 
    */ 
    public PlotExample3(String title) { 
     super(title); 
     ChartPanel chartPanel = (ChartPanel) createDemoPanel(); 
     chartPanel.setPreferredSize(new java.awt.Dimension(500, 270)); 
     setContentPane(chartPanel); 
    } 

    /** 
    * Creates a chart. 
    * 
    * @param dataset a dataset. 
    * 
    * @return A chart. 
    */ 
    private static JFreeChart createChart(XYDataset dataset) { 

     JFreeChart chart = ChartFactory.createTimeSeriesChart(
      "Test", // title 
      "X",    // x-axis label 
      "Y", // y-axis label 
      dataset,   // data 
      true,    // create legend? 
      true,    // generate tooltips? 
      false    // generate URLs? 
     ); 

     chart.setBackgroundPaint(Color.white); 

     final XYPlot plot = chart.getXYPlot(); 
     plot.setBackgroundPaint(Color.lightGray); 
    // plot.setAxisOffset(new Spacer(Spacer.ABSOLUTE, 5.0, 5.0, 5.0, 5.0)); 
     plot.setDomainGridlinePaint(Color.white); 
     plot.setRangeGridlinePaint(Color.white); 

     final XYLineAndShapeRenderer renderer = new XYLineAndShapeRenderer(); 
     renderer.setSeriesLinesVisible(1, false); 
     renderer.setSeriesShapesVisible(1, false); 
     plot.setRenderer(renderer); 

     // change the auto tick unit selection to integer units only... 
     final NumberAxis rangeAxis = (NumberAxis) plot.getRangeAxis(); 
     rangeAxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits()); 

     return chart; 
    } 

    /** 
    * Creates a dataset, consisting of two series of monthly data. 
    * 
    * @return The dataset. 
    */ 
    private static XYDataset createDataset() { 

     XYSeries s1 = new XYSeries("Test"); 
     s1.add(1, 181.8); 
     s1.add(2, 167.3); 
     s1.add(3, 153.8); 
     s1.add(4, 167.6); 
     s1.add(5, 158.8); 
     s1.add(7, 148.3); 
     s1.add(8, 153.9); 
     s1.add(9, 142.7); 
     s1.add(10,123.2); 
     s1.add(11,131.8); 
     s1.add(12,139.6); 


     // ****************************************************************** 
     // More than 150 demo applications are included with the JFreeChart 
     // Developer Guide...for more information, see: 
     // 
     // > http://www.object-refinery.com/jfreechart/guide.html 
     // 
     // ****************************************************************** 

     XYSeriesCollection dataset = new XYSeriesCollection(); 
     dataset.addSeries(s1);   

     return dataset; 

    } 

    /** 
    * Creates a panel for the demo (used by SuperDemo.java). 
    * 
    * @return A panel. 
    */ 
    public static JPanel createDemoPanel() { 
     JFreeChart chart = createChart(createDataset()); 


     ChartPanel panel = new ChartPanel(chart); 

     try { 
      ChartUtilities.saveChartAsPNG(new File("C:/Users/pb/Pictures/MyChart.png"),chart,1000,1000); 
     } catch(Exception e) { 
      System.err.println(e.getMessage()); 
     } 
     panel.setFillZoomRectangle(true); 
     panel.setMouseWheelEnabled(true); 
     return panel; 
    } 

    /** 
    * Starting point for the demonstration application. 
    * 
    * @param args ignored. 
    */ 
    public static void main(String[] args) { 

     PlotExample3 demo = new PlotExample3("Time Series Chart Demo 1"); 
     demo.pack(); 
     RefineryUtilities.centerFrameOnScreen(demo); 
     demo.setVisible(true); 

    } 

}

來源

2014-02-20 balistik

我沒有看到你在哪裏改變域軸，只有RangeAxis。 –

嗨安德魯，我想我不知道它是什麼。我認爲將DateAxis改爲NumberAxis就足夠了，因爲我使用了示例程序。由於我有時間限制，我沒有深入JFreeChart的細節。 – balistik

我想我發現它爲什麼這樣做。我在程序中使用createTimeSeriesChart。我還沒有嘗試過，但我想這是造成它。 – balistik

ChartFactory.createTimeSeriesChart（）創建帶有DateAxis爲x軸和y軸一個NumberAxis的圖表。這種方法的Javadocs甚至會說：「時間序列圖是一個XY軸，它的x軸爲DateAxis，y軸爲NumberAxis。」

你應該嘗試ChartFactory.createXYLineChart（），它會給你一個NumberAxis的X軸。

來源

2014-02-21 07:42:54

我的x軸整數值前綴爲「19:00:00」。

回答

相關問題