通过调节坐标进行jfree图的放大缩小

最新推荐文章于 2024-11-12 11:25:25 发布

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本文介绍了一种使用Java Swing组件JSlider结合JFreeChart实现图表动态缩放的方法。通过水平和垂直滑动条调整图表显示范围，实现X轴（时间轴）和Y轴的放大与缩小功能。

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通过调节坐标进行jfree图的放大缩小

import java.awt.BorderLayout;
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.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.XYPlot;
import org.jfree.data.Range;

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());
   // }

}
}