zoomRange()如何工作? [英] how does zoomRange() works?

问题描述

我需要缩小 jFreeChart 中的rangeAxis，所以我使用了

I need to zoom out from rangeAxis in jFreeChart, so I've used zoomRange for this purpose.

但是我不明白什么是 lowerPercent 和 upperPercent ?

But I didn't understand what is lowerPercent and upperPercent?

我要如下图所示设置rangeAxis.我该怎么办?

I want to set the rangeAxis as shown below in the image. How can i do that?

我已经尝试过了，但是不知道 rangeAxis.zoomRange(0，?)

I've tried this but don't know what should be the value of rangeAxis.zoomRange(0,?)

public class Profilee  {



    double last=0;
    ChartFrame frame1;

    JFreeChart chart;
    ChartUtilities cu=new ChartUtilitiesImpl();

    public void generateProfile(double[] pointValue,double[] distance){
        ArrayList pv=new ArrayList();
        ArrayList dist=new ArrayList();

        pv.add(pointValue);
        dist.add(distance);

        XYSeries series = new XYSeries("");
        for(int i=0;i<pointValue.length-1;i++){

              series.add(last,pointValue[i]);
              last=distance[i];
         }



      XYDataset xyDataset = new XYSeriesCollection(series);
      chart= ChartFactory.createXYAreaChart("Profile View Of Contour", "Distance", "Contour Value", xyDataset, PlotOrientation.VERTICAL, true, true, false);

      ValueAxis rangeAxis = chart.getXYPlot().getRangeAxis();

      //rangeAxis.setLowerBound(-3);
      rangeAxis.zoomRange(0,?);     //What should be Value over here?
      frame1=new ChartFrame("XYLine Chart",chart);

      frame1.setVisible(true);
      frame1.setSize(1300,700);
    }


    public static void main(String ar[]){
        Profilee pro=new Profilee();
        double[] pv={3,2,3,0,5,-2,10};
        double[] dist={1,4,8,12,14,20,24};
        pro.generateProfile(pv, dist);



    }

    private static class ChartUtilitiesImpl extends ChartUtilities {

        public ChartUtilitiesImpl() {
        }
    }
}

推荐答案

默认情况下， ValueAxis 自动调整其范围以适应数据集.您可以使用 setRange()方法之一采用显式范围，如上图所示.

By default, ValueAxis automatically adjusts its range to accommodate the dataset. You can adopt an explicit range, such as shown in the image above, using one of the setRange() methods.

rangeAxis.setRange(-8, 12);

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