JFreeChart生成多Y轴的实例

今天在“问答”看到有人问这个问题，自己参考了JfreeChart的参考手册，写了个例子。记录一下：

 

大概思路是：

 

1、先生成一个常规的Chart

2、然后新建一个坐标轴，添加到Chart的Plot中。并对该坐标轴进行颜色、字体等的相应设置

3、向该坐标轴添加dataset

 

看代码：

package edu.xjtu;

import java.awt.Color;
import java.awt.Font;

import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartFrame;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.XYLineAndShapeRenderer;
import org.jfree.chart.title.TextTitle;
import org.jfree.data.xy.XYSeries;
import org.jfree.data.xy.XYSeriesCollection;
import org.jfree.ui.HorizontalAlignment;
import org.jfree.ui.RectangleEdge;

public class MultiAxises {

	XYSeriesCollection dataset1;
	XYSeriesCollection dataset2;
	XYSeriesCollection dataset3;
	JFreeChart chart;
	XYPlot plot;
	
	public MultiAxises() {
		// 生成数据
		XYSeries series1 = new XYSeries("系列1");
		series1.add(1, 2);
		series1.add(2, 4);
		series1.add(7, 6);

		XYSeries series2 = new XYSeries("系列2");
		series2.add(5, 2);
		series2.add(3, 4);
		series2.add(7, 3);

		XYSeries series3 = new XYSeries("系列3");
		series3.add(3, 2);
		series3.add(5, 4);
		series3.add(4, 6);

		dataset1 = new XYSeriesCollection();
		dataset2 = new XYSeriesCollection();
		dataset3 = new XYSeriesCollection();
		
		dataset1.addSeries(series1);
		dataset2.addSeries(series2);
		dataset3.addSeries(series3);

		chart = ChartFactory.createXYLineChart("MultiAxis", "X axis",
				"First Y Axis", dataset1, PlotOrientation.VERTICAL, true, true,
				false);

		plot = chart.getXYPlot();

		
		// 添加第2个Y轴
		
		NumberAxis axis2 = new NumberAxis("Second Axis");
			// -- 修改第2个Y轴的显示效果
		axis2.setAxisLinePaint(Color.BLUE);
		axis2.setLabelPaint(Color.BLUE);
		axis2.setTickLabelPaint(Color.BLUE);
		
		plot.setRangeAxis(1, axis2);
		plot.setDataset(1, dataset2);
		plot.mapDatasetToRangeAxis(1, 1);
		     // -- 修改第2条曲线显示效果
		XYLineAndShapeRenderer render2 =  new XYLineAndShapeRenderer();	
		render2.setSeriesPaint(0, Color.BLUE);
		plot.setRenderer(1, render2);
		
		
		// 添加第3个Y轴
		NumberAxis axis3 = new NumberAxis("Third Axis");
		
		axis3.setAxisLinePaint(Color.GREEN);
		axis3.setLabelPaint(Color.GREEN);
		axis3.setTickLabelPaint(Color.GREEN);
		
		plot.setRangeAxis(2, axis3);
		plot.setDataset(2, dataset3);
		plot.mapDatasetToRangeAxis(2, 2);
		
		XYLineAndShapeRenderer render3 =  new XYLineAndShapeRenderer();	
		render3.setSeriesPaint(0, Color.GREEN);
		plot.setRenderer(2, render3);
		
		
		TextTitle copyright = new TextTitle(" 小龙飞翔@Java Eye    ");
		copyright.setPosition(RectangleEdge.BOTTOM);
		copyright.setHorizontalAlignment(HorizontalAlignment.RIGHT);
		copyright.setFont(new Font("黑体", 12, 12));
		chart.addSubtitle(copyright);
		chart.getLegend().setItemFont(new Font("黑体", 12, 12));
	}

	public static void main(String[] agrs) {
		MultiAxises obj = new MultiAxises();
		ChartFrame frame = new ChartFrame("多坐标轴", obj.chart);
		frame.pack();
		frame.setVisible(true);
	}

}

 看效果：

评论

1 楼 终点阿虎 2010-03-04  

请问下Y轴上的刻度是怎么控制的？
比如说:
First Y Axis 这上面的是0.5 刻度增长，
我现在想 1 刻度增长，如何实现？