通过调节坐标进行jfree图的放大缩小

http://blog.csdn.net/lt1983lt/article/details/5665085

import Java.awt.BorderLayout;
import java.awt.Color;
import java.util.Hashtable;

import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JSlider;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;

import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.DateAxis;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.plot.Plot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.XYItemRenderer;
import org.jfree.data.Range;
import org.jfree.data.general.DatasetUtilities;
import org.jfree.data.time.Minute;
import org.jfree.data.time.RegularTimePeriod;
import org.jfree.data.time.TimeSeries;
import org.jfree.data.time.TimeSeriesCollection;
import org.jfree.data.xy.XYDataset;
import org.jfree.ui.RectangleInsets;
import org.jfree.ui.RefineryUtilities;

public class JslideJPanel extends JPanel implements ChangeListener {
 private ChartPanel chartpanel = null;

private JSlider sliderWest = null;

private JSlider sliderSouth = null;

private int maxval = 100;

private int minval = -maxval;

private int lastValueX = 0;

private int lastValueY = 0;

private NumberAxis numberaxis_Y = null;

private double topY = 0.0;

private double lowY = 0.0;

private double distanceY = 0.0;

private double xishuY = 0.0;

DateAxis dateaxis_X = null;

private double topX = 0.0;

private double lowX = 0.0;

private double distanceX = 0.0;

private double xishuX = 0.0;

@SuppressWarnings("unchecked")
 public JslideJPanel(ChartPanel chartpanel, boolean canZoom) {
  if (true) {
   this.setLayout(new BorderLayout());
   this.chartpanel = chartpanel;
   this.sliderSouth = new JSlider(JSlider.HORIZONTAL, minval, maxval,
     0);
   sliderSouth.setMaximum(maxval);
   sliderSouth.setMinimum(minval);
   sliderSouth.setPaintTicks(true);
   sliderSouth.setMajorTickSpacing(20);
   sliderSouth.setMinorTickSpacing(10);
   sliderSouth.setPaintLabels(true);
   sliderSouth.setPaintTrack(true);
   sliderSouth.setSnapToTicks(true);
   Hashtable table = new Hashtable();
   table.put(new Integer(minval), new JLabel("缩小"));
   table.put(new Integer(maxval), new JLabel("放大"));
   sliderSouth.setLabelTable(table);
   sliderSouth.addChangeListener(this);
   this.sliderWest = new JSlider(JSlider.VERTICAL, minval, maxval, 0);
   /*
    * setPaintTicks()方法是设置是否在JSlider加上刻度，若为true则下面两行才有作用。
    * 设置大刻度与小刻度之间的距离(setMajorTickSpacing()与setMinorTickSpacing()方法).例如若大刻度间距离为30，
    * 小刻度间距离为10，则表示2个大刻度间会有3个小刻度.
    * setSnapToTicks()方法表示一次移动一个小刻度，而不再是一次移动一个单位刻度
    */

sliderWest.setMaximum(maxval);
   sliderWest.setMinimum(minval);
   sliderWest.setPaintTicks(true);
   sliderWest.setMajorTickSpacing(20);
   sliderWest.setMinorTickSpacing(10);
   sliderWest.setPaintLabels(true);
   sliderWest.setPaintTrack(true);
   // sliderWest.setSnapToTicks(true);
   sliderWest.setLabelTable(table);
   sliderWest.addChangeListener(this);
   this.add(chartpanel, BorderLayout.CENTER);
   this.add(sliderSouth, BorderLayout.SOUTH);
   this.add(sliderWest, BorderLayout.WEST);
   // 得到一些初始的参数
   JFreeChart chart = chartpanel.getChart();
   XYPlot xyplot = chart.getXYPlot();
   // 处理Y轴
   numberaxis_Y = (NumberAxis) xyplot.getRangeAxis();
   topY = numberaxis_Y.getRange().getUpperBound();
   lowY = numberaxis_Y.getRange().getLowerBound();
   distanceY = (topY - lowY) / (2 * maxval);
   xishuY = (maxval - 1) / (double) maxval;
   // 这个是为了防止放大时setRange(n,n)这种情况的出现。

// 处理X轴
   dateaxis_X = (DateAxis) xyplot.getDomainAxis();
   // 最小范围是一天，得到的毫秒数是通过查询的日期+距离0点的毫秒数得到的
   topX = dateaxis_X.getRange().getUpperBound();
   lowX = dateaxis_X.getRange().getLowerBound();
   distanceX = (topX - lowX) / (2 * maxval);
   xishuX = (maxval - 1) / (double) maxval;

} else {
   this.setLayout(new BorderLayout());
   this.chartpanel = chartpanel;
   this.add(chartpanel, BorderLayout.CENTER);
  }

}

public ChartPanel getChartpanel() {
  return chartpanel;
 }

public void setChartpanel(ChartPanel chartpanel) {
  this.chartpanel = chartpanel;
 }

public void stateChanged(ChangeEvent e) {
  System.out.println(sliderSouth.getValue() + "::::::::::::::::::::"
    + sliderWest.getValue());

if (e.getSource() == sliderWest) {
   // 处理y轴的缩放
   int slideInt = sliderWest.getValue();
   double distanceHere = distanceY * slideInt;
   if (slideInt >= 0) {
    // 乘以一个系数是为了防止setRange(a,a)这样的情况发生
    numberaxis_Y.setRange(lowY + distanceHere, topY - xishuY
      * distanceHere);
   } else {
    numberaxis_Y.setRange(lowY + distanceHere, topY - distanceHere);
   }
  } else if (e.getSource() == sliderSouth) {
   // 处理X轴的缩放
   int slideInt = sliderSouth.getValue();
   double distanceHere = distanceX * slideInt;
   if (slideInt >= 0) {
    // 乘以一个系数是为了防止setRange(a,a)这样的情况发生
    dateaxis_X.setRange(lowX + distanceHere, topX - xishuX
      * distanceHere);
   } else {
    dateaxis_X.setRange(lowX + distanceHere, topX - distanceHere);
   }
  }

// DateAxis numberaxis_X = (DateAxis) xyplot.getDomainAxis();
  // //最小范围是一天，得到的毫秒数是通过查询的日期+距离0点的毫秒数得到的
  // System.out.println(numberaxis_X.getRange().getUpperBound()+":......."+(numberaxis_X.getRange().getUpperBound()%86400000)/3600000);
  // System.out.println(numberaxis_X.getRange().getLowerBound()+":......."+(numberaxis_X.getRange().getLowerBound()%86400000)/3600000);
  // // numberaxis_X.setRange(arg0, arg1)
  // 怎么区分四种操作
  // 1通过e.getSource() == sliderWest可以区分是哪边需要放大或者缩小
  // 2通过与前一个值的大小的比较，确定是放大还是缩小，通过值的比较确定放大缩小的次数
  // chartpanel.zoomInDomain(arg0, arg1);//domain是横坐标
  // if(e.getSource() == sliderWest)
  // {
  // chartpanel.zoomOutBoth(sliderSouth.getValue(),
  // sliderWest.getValue());
  // }else if(e.getSource() == sliderSouth){
  // chartpanel.zoomOutBoth(sliderSouth.getValue(),
  // sliderWest.getValue());
  // }

}

}