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());
// }

}

}