用jfreechart实现折线图横坐标的问题！

Question

如下图所示：我想用jfreechart做一个折线图横坐标的标度是6的倍数，但折点的横坐标并不是6的倍数，而是无规律的。用jfreechart怎么实现啊？
：

Answer 1

是啊，我也想问这个问题，好像jfreechart给你自动控制了，我要手动控制怎么做？

Answer 2

jfreechart只不过是画图而已。
你手动的话：
是改变数据吗？
还是改变显示方式。
还是。
肯定可以实现咯，提供不同的入口或者参数啊

Answer 3

写一个数据填充类，通过sql调用数据库取到各个坐标的值，分别填充入横坐标和纵坐标，然后生成JPG,就OK啦

Answer 4

恩
我也是这么做的
将横纵坐标值填进去图自然就出来了啊
有sql的
还有javabean的
网上实例也多，挺方便的

Answer 5

好像不太好弄.因为纵坐标才是你想要的值,横坐标,应该是一个固定 的,比如:
        String str1="北京";
        String str2="上海";
        String str3="深圳";        String str4="葡萄";
        String str5="苹果";
        String str6="香蕉";
        String str7="梨";
        String str8="桃子";        DefaultCategoryDataset dcd=new DefaultCategoryDataset();
        dcd.addValue(1.0D,str1,str4);
        dcd.addValue(4.0D,str1,str5);
        dcd.addValue(3.0D,str1,str6);
        dcd.addValue(5.0D,str1,str7);
        dcd.addValue(5.0D,str1,str8);
        dcd.addValue(5.0D,str2,str4);
        dcd.addValue(7.0D,str2,str5);
        dcd.addValue(6.0D,str2,str6);
        dcd.addValue(8.0D,str2,str7);
        dcd.addValue(4.0D,str2,str8);
        dcd.addValue(4.0D,str3,str4);
        dcd.addValue(3.0D,str3,str5);
        dcd.addValue(2.0D,str3,str6);
        dcd.addValue(3.0D,str3,str7);
        dcd.addValue(6.0D,str3,str8);
如果是你要的,那葡萄和苹果中间算什么?
月分中间可有得算,
用这个DATA应该实现不了的.你可以试试其它的
DATABASE,试试,如果找到了再回复

Answer 6

XYDataset 要用这个,你搜索下.
给个例子,如果可以自己改吧.没有文档的东西只有看源码.实现这些奇怪的图一般都要自己设置横纵坐标,然后画一张图覆盖上去的.
public static JFreeChart createChart(){
        XYDataset localXYDataset1=createDataset("Series 1",100.0D,new Minute(),200);
        JFreeChart chart=ChartFactory.createTimeSeriesChart(
                "Multiple Axis Demo 1","Time of Day","Primary Range Axis",localXYDataset1,
                true,true,false);
        chart.addSubtitle(new TextTitle("Four datasets and four range axes."));
        
        XYPlot localXYPlot=(XYPlot)chart.getPlot();
        localXYPlot.setOrientation(PlotOrientation.VERTICAL);
        localXYPlot.setDomainPannable(true);
        localXYPlot.setRangePannable(true);
        localXYPlot.getRangeAxis().setFixedDimension(15.0D);
        
        NumberAxis localNumberAxis1=new NumberAxis("Range Axis 2");
        localNumberAxis1.setFixedDimension(10.0D);
        localNumberAxis1.setAutoRangeIncludesZero(false);
        localXYPlot.setRangeAxis(1,localNumberAxis1);
        
        localXYPlot.setRangeAxisLocation(1,AxisLocation.BOTTOM_OR_LEFT);
        XYDataset localXYDataset2=createDataset("Series 2",1000.0D,new Minute(),170);
        localXYPlot.setDataset(1,localXYDataset2);
        localXYPlot.mapDatasetToRangeAxis(1,1);
        StandardXYItemRenderer localStandardXYItemRenderer1=new StandardXYItemRenderer();
        localXYPlot.setRenderer(1,localStandardXYItemRenderer1);
        NumberAxis localNumberAxis2=new NumberAxis("Range Axis 3");
        localXYPlot.setRangeAxis(2,localNumberAxis2);        /*XYDataset localXYDataset3=createDataset("Series 3",10000.0D,new Minute(),170);
        localXYPlot.setDataset(2,localXYDataset3);*/
        localXYPlot.mapDatasetToRangeAxis(2,2);
        StandardXYItemRenderer localStandardXYItemRenderer2=new StandardXYItemRenderer();
        localXYPlot.setRenderer(2,localStandardXYItemRenderer2);
        /*NumberAxis localNumberAxis3=new NumberAxis("Range Axis 4");
        localXYPlot.setRangeAxis(3,localNumberAxis3);*/        /*XYDataset localXYDataset4=createDataset("Series 4",25.0D,new Minute(),200);
        localXYPlot.setDataset(3,localXYDataset4);*/
        
        localXYPlot.mapDatasetToRangeAxis(3,3);
        StandardXYItemRenderer localStandardXYItemRenderer3=new StandardXYItemRenderer();
        localXYPlot.setRenderer(3,localStandardXYItemRenderer3);
        ChartUtilities.applyCurrentTheme(chart);
        localXYPlot.getRenderer().setSeriesPaint(0,Color.black);
        localStandardXYItemRenderer1.setSeriesPaint(0,Color.red);
        localNumberAxis1.setLabelPaint(Color.red);
        localNumberAxis1.setTickLabelPaint(Color.red);
        
        localStandardXYItemRenderer2.setSeriesPaint(0,Color.blue);
        localNumberAxis2.setLabelPaint(Color.blue);
        localNumberAxis2.setTickLabelPaint(Color.blue);
        localStandardXYItemRenderer3.setSeriesPaint(0,Color.green);
        /*localNumberAxis3.setLabelPaint(Color.green);
        localNumberAxis3.setTickLabelPaint(Color.green);*/
        return chart;
    }    public static XYDataset createDataset(String paramString,double paramDouble,
            RegularTimePeriod paramRegularTimePeriod,int paramInt){
        TimeSeries localTimeSeries=new TimeSeries(paramString);
        RegularTimePeriod localRegularTimePeriod=paramRegularTimePeriod;        double d=paramDouble;
        for(int i=0;i<paramInt;++i){
            localTimeSeries.add(localRegularTimePeriod,d);
            localRegularTimePeriod=localRegularTimePeriod.next();
            d*=(1.0D+(Math.random()-0.495D)/10.0D);
        }        TimeSeriesCollection localTimeSeriesCollection=new TimeSeriesCollection();
        localTimeSeriesCollection.addSeries(localTimeSeries);
        return localTimeSeriesCollection;
    }    public static void saveCharToJPG(JFreeChart chart,String fileName) throws IOException{
        OutputStream fos=null;
        try{
            fos=new BufferedOutputStream(new FileOutputStream(fileName));
            ChartUtilities.writeChartAsJPEG(fos,1.0f,chart,1024,768,null);
        }catch(Exception e){
        }finally{
            fos.close();
        }
    }    public static void main(String[] args) throws IOException{
        saveCharToJPG(createChart(),"D:\\multipleaxis.jpg");
    }