經過鼠標拖動來修改JFreeChart序列值

經過鼠標拖動來修改JFreeChart序列值

最近因一個應用的須要，要經過鼠標的拖動來修改序列的值，在網上查了好多資料，都沒有找到好的實現，在CSDN也有很多這方面的詢問貼子。在參考網上前人資料和閱讀JFreeChart文檔的基礎，總算有了個初步的實現。發在這裏，但願能對別人有點借鑑，也但願獲得你們指點，進一步完善。

一 JFreeCJFreeChart的基本使用

JFreeChart是一個開源的Java圖形開發包,它從柱形圖，餅形圖，到雷達圖，蠟燭圖等等無所不包,能夠用在C/S,B/S應用的開發。當前的JFreeChart的最新版本爲jfreechart-1.0.12。能夠到http://www.jfree.org/下載。

不論建立何種類型的圖表，JFreeChart都遵循如下幾個步驟：
一、創建Dataset。全部的數據都存放在Dataset中的

二、創建JFreeChart來表明要顯示的圖形，將dataset中的數據導入到JFreeChart中

三、設置JFreeChart的顯示屬性。這一步可以使用默認的屬性。
四、圖片顯示。

二 重要的類和接口：

org.jfree.data.general.Dataset 全部數據源類都要實現的接口
org.jfree.chart.ChartFactory 由它來產生 JFreeChart 對象
org.jfree.chart.JFreeChart 全部對圖形的調整都是經過它來進行
org.jfree.chart.plot.Plot 經過JFreeChart 對象得到它，經過它對圖形外部部分進行調整

三.本文實現主要思路

 

本文的拖動修改數據主要是藉助XYItemEntity類的對象完成，每一個XYItemEntity都包含了咱們須要的重要信息：
XYDataset dataset：該節點所在數據集
int series：所在數據序列的序號
int item：所在序列中數據項的序號

因爲JFreeChart的鼠標監聽接口中沒有提供拖拽方法（也多是我還沒找到），因此本文先在JFreeChart的chartMouseClicked事件中獲得XYItemEntity的對象，而後在awt的MouseMotionListener監聽接口的mouseDragged方法中處理數據的拖動、修改和圖表更新。具體實現源碼以下：

TimeSeriesTest. java

 //插入代碼的那個框框實在是很差使，改了幾回都改很差，直接把代碼粘爲文本

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.Point;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
import java.text.SimpleDateFormat;

import javax.swing.JPanel;

import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartMouseEvent;
import org.jfree.chart.ChartMouseListener;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.ChartRenderingInfo;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.DateAxis;
import org.jfree.chart.axis.DateTickUnit;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.entity.XYItemEntity;
import org.jfree.chart.plot.ValueMarker;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.XYLineAndShapeRenderer;
import org.jfree.chart.title.LegendTitle;
import org.jfree.chart.title.TextTitle;
import org.jfree.data.time.Day;
import org.jfree.data.time.Hour;
import org.jfree.data.time.TimeSeries;
import org.jfree.data.time.TimeSeriesCollection;
import org.jfree.data.xy.XYDataset;
import org.jfree.ui.ApplicationFrame;
import org.jfree.ui.RectangleEdge;
import org.jfree.ui.RefineryUtilities;

public class TimeSeriesTest extends ApplicationFrame implements ChartMouseListener, MouseListener, MouseMotionListener{
   private static final long serialVersionUID = 1L;
   private JFreeChart chart;
   private ChartPanel chartPanel;
   private boolean domainCrosshairState;
   private XYItemEntity xyItemEntity;
   private boolean isDraged;
  
   public TimeSeriesTest(String str){
      super(str);
      XYDataset localXYDataset = createDataset();
      chart = createChart(localXYDataset);
      chartPanel = new ChartPanel(chart);
      chartPanel.setPreferredSize(new Dimension(800, 500));
      // chartPanel.setMouseZoomable(true, false);
      chartPanel.setMouseZoomable(false);
      chartPanel.addChartMouseListener(this);
      chartPanel.addMouseListener(this);
      chartPanel.addMouseMotionListener(this);

      domainCrosshairState = false;
      isDraged = false;
      setContentPane(chartPanel);
   }

   private static XYDataset createDataset(){
      Day localDay = new Day();
      TimeSeries localTimeSeries1 = new TimeSeries("隨機數據", Hour.class);
      localTimeSeries1.add(new Hour(0, localDay), 520.2D);
      localTimeSeries1.add(new Hour(2, localDay), 575.1D);
      localTimeSeries1.add(new Hour(4, localDay), 564.4D);
      localTimeSeries1.add(new Hour(6, localDay), 540.2D);
      localTimeSeries1.add(new Hour(8, localDay), 530.2D);
      localTimeSeries1.add(new Hour(10, localDay), 555.2D);
      localTimeSeries1.add(new Hour(12, localDay), 580.4D);
      localTimeSeries1.add(new Hour(14, localDay), 583.2D);
      localTimeSeries1.add(new Hour(16, localDay), 595.2D);
      localTimeSeries1.add(new Hour(18, localDay), 564.4D);
      localTimeSeries1.add(new Hour(20, localDay), 523.2D);
      localTimeSeries1.add(new Hour(22, localDay), 515.2D);
      localTimeSeries1.add(new Hour(24, localDay), 530.4D);

      TimeSeries localTimeSeries2 = new TimeSeries("隨機數據", Hour.class);
      localTimeSeries2.add(new Hour(0, localDay), 620.2D);
      localTimeSeries2.add(new Hour(2, localDay), 654.1D);
      localTimeSeries2.add(new Hour(4, localDay), 664.4D);
      localTimeSeries2.add(new Hour(6, localDay), 670.2D);
      localTimeSeries2.add(new Hour(8, localDay), 690.2D);
      localTimeSeries2.add(new Hour(10, localDay), 695.2D);
      localTimeSeries2.add(new Hour(12, localDay), 680.4D);
      localTimeSeries2.add(new Hour(14, localDay), 683.2D);
      localTimeSeries2.add(new Hour(16, localDay), 695.2D);
      localTimeSeries2.add(new Hour(18, localDay), 714.4D);
      localTimeSeries2.add(new Hour(20, localDay), 723.2D);
      localTimeSeries2.add(new Hour(22, localDay), 715.2D);
      localTimeSeries2.add(new Hour(24, localDay), 680.4D);

      TimeSeriesCollection localTimeSeriesCollection = new TimeSeriesCollection();
      localTimeSeriesCollection.addSeries(localTimeSeries1);
      localTimeSeriesCollection.addSeries(localTimeSeries2);

      return localTimeSeriesCollection;

   }

   private static JFreeChart createChart(XYDataset xyDataset){
      JFreeChart localChart = ChartFactory.createTimeSeriesChart("時間序列測試", "時間", "數值", xyDataset, true, true, false);
      TextTitle title = localChart.getTitle();
      title.setFont(new Font("宋體", Font.BOLD, 24));
      LegendTitle legend = localChart.getLegend();
      legend.setItemFont(new Font("宋體", Font.ITALIC, 14));

      XYPlot plot = (XYPlot)localChart.getPlot();
      plot.setBackgroundPaint(null);

      // X 軸
      DateAxis xAxis = (DateAxis)plot.getDomainAxis();
      xAxis.setLabelFont(new Font("宋體", Font.PLAIN, 18));
      xAxis.setLabelPaint(Color.BLUE);
      SimpleDateFormat fmt = new SimpleDateFormat("k:mm");
      xAxis.setTickUnit(new DateTickUnit(DateTickUnit.HOUR, 2, fmt));

      // Y 軸
      ValueAxis yAxis = plot.getRangeAxis();
      yAxis.setLabelFont(new Font("宋體", Font.PLAIN, 18));
      yAxis.setLabelPaint(Color.BLUE);

      return localChart;
   }

   public static JPanel createDemoPanel(){
      JFreeChart chart = createChart(createDataset());
      return new ChartPanel(chart);
   }

   public void chartMouseClicked(ChartMouseEvent e){
      if(e.getTrigger().getClickCount() == 2){
         domainCrosshairState = !domainCrosshairState;
         // plot.setDomainCrosshairVisible(domainCrosshairState);
         chartPanel.setHorizontalAxisTrace(domainCrosshairState); // 雙擊豎線
      }
     
      xyItemEntity = (XYItemEntity)e.getEntity();
      if(xyItemEntity == null) return;
      int seriesIndex = xyItemEntity.getSeriesIndex();

      XYPlot xyPlot = (XYPlot)chart.getPlot();
      XYLineAndShapeRenderer xyLineAndShapeRenderer = (XYLineAndShapeRenderer)xyPlot.getRenderer();
      for(int index = 0; index < xyItemEntity.getDataset().getSeriesCount(); index++){
         xyLineAndShapeRenderer.setSeriesShapesVisible(index, false);
      }
      xyLineAndShapeRenderer.setSeriesShapesVisible(seriesIndex, true); // 數據點可見
     
   }

   public void mousePressed(MouseEvent e){
      // System.out.println("mouse key is pressed!");
  
   }

   public void mouseReleased(MouseEvent e){
      // System.out.println("mouse key is released!");
      xyItemEntity = null;
      isDraged = false;
  
   }

   public void mouseEntered(MouseEvent mouseEvent){
      // System.out.println( "mouse key is pressed!");

   }

   public void mouseExited(MouseEvent mouseEvent){
      // System.out.println( "mouse key is pressed!");

   }

   public void mouseClicked(MouseEvent mouseEvent){
      // System.out.println( "mouse key is pressed!");

   }

   public void chartMouseMoved(ChartMouseEvent e){

   }

   public void mouseDragged(MouseEvent e){

      if(xyItemEntity==null) return;
      int seriesIndex = xyItemEntity.getSeriesIndex();
      int itemIndex = xyItemEntity.getItem();
     
      int xPos = e.getX();
      int yPos = e.getY();

      Point2D point2D = chartPanel.translateScreenToJava2D(new Point(xPos, yPos));
      XYPlot xyPlot = (XYPlot)chart.getPlot();
      ChartRenderingInfo chartRenderingInfo = chartPanel.getChartRenderingInfo();
      Rectangle2D rectangle2D = chartRenderingInfo.getPlotInfo().getDataArea();
      ValueAxis valueAxis = xyPlot.getRangeAxis();
      RectangleEdge rectangleEdge = xyPlot.getRangeAxisEdge();
     
      double value = valueAxis.java2DToValue(point2D.getY(), rectangle2D, rectangleEdge);

      TimeSeriesCollection tsc = (TimeSeriesCollection)xyItemEntity.getDataset();
      TimeSeries ts = tsc.getSeries(seriesIndex);
      ts.update(itemIndex,value);
      isDraged = true;
   }

   public void mouseMoved(MouseEvent e){

   }

   public static void main(String[] paramArrayOfString){
      TimeSeriesTest dragValueApp = new TimeSeriesTest("時間序列拖動示例");
      dragValueApp.pack();
      RefineryUtilities.centerFrameOnScreen(dragValueApp);
      dragValueApp.setVisible(true);
   }
}

以上是本人研習兩天摸索出來的，寫在這裏算是拋磚引玉，還請各位改進不足之處。

PS

 無版權，可自由修改；