Tony Lin的部落格

用了二天的時間做到這個效果

加上和JFreeChart 官方人員聯繫的協助

終於有了以下的結果

真是太高興了

不得不一反常態的把這code放上來

太爽了~~~~~~~~~

 

=====================================================

/*
 * Created on 2005/8/2
 * @author tony
 */
import org.jfree.chart.*;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.XYLineAndShapeRenderer;

import org.jfree.data.xy.XYSeries;
import org.jfree.data.xy.XYSeriesCollection;

import java.awt.Color;
import java.io.FileOutputStream;
import java.io.IOException;

/**
 * @author tony
 * make sure the XYLine in two color (or more)
 */
public class TestXYPlot {

    private XYSeries series = null;
    private XYSeriesCollection xyDataset = new XYSeriesCollection();

    public void createSeries(double doubleX, double doubleY,String seriesName) throws IOException{
        series = new XYSeries(seriesName,true,false);
        this.addData(series,doubleX,doubleY);
        series.add(200,100);//add this twice
        xyDataset.addSeries(series);
    }
    private void addData(XYSeries series,double doubleX, double doubleY){
        if(this.series != null){
            series.add(doubleX,doubleY);
        }
    }

    public TestXYPlot() throws Exception{
        super();

        this.createSeries(100,300,"qualified合格");
        this.createSeries(300,500,"unqualified不合格");

        JFreeChart jfreechart = ChartFactory.createXYLineChart("TestXYPlot.jpg",
                "", "", xyDataset, PlotOrientation.VERTICAL, true, true, false);

        XYPlot xyplot = (XYPlot) jfreechart.getPlot();
        xyplot.setRangeGridlinePaint(Color.ORANGE);//格線顏色(Grid Line color)
        /***
         * 將符合八大規則的線段指定為藍色,而線段預設顏色為紅色
         * series(XYLine) first default color is red
         * If you have more series,JFreeChart will control color by itself,but you can reset it.
         **/
        //setSeriesPaint(int args,ChartColor.BLUE);the args : It is ths series(XYLine) No.
        jfreechart.getXYPlot().getRenderer().setSeriesPaint(0,ChartColor.BLUE);//set XYLine color
//        jfreechart.getXYPlot().getRenderer().setStroke(new BasicStroke(10));//XYLine寬度(XYLine wide)
//        jfreechart.getXYPlot().getRenderer().setBaseSeriesVisibleInLegend(false);//說明出現與否(Legend appear or not)

        XYLineAndShapeRenderer xylineshaperender = (XYLineAndShapeRenderer)xyplot.getRenderer();
        xylineshaperender.setShapesVisible(false);//控制座標點出現與否(set the shape point appear or not)

        FileOutputStream jpgoutput = new FileOutputStream("c://xy.jpg");

        ChartUtilities.writeChartAsJPEG(jpgoutput, 100,
                jfreechart, 700, 500, null);

        jpgoutput.close();
    }

    public static void main(String args[])throws Exception{
        new TestXYPlot();
        System.out.println("it is finished");
    }

}
======================================================

原理：

要同一條線設置二種以上顏色在JFreeChart中是不可能的

但用點小技巧就可以在畫面上看到這種效果

把一條線「拆」成好多條

指定某些線段是另一個顏色

就可以達到所要求的效果了^^

 

小技巧：

二個點做成一條線

所以，重覆使用的點要add二次

=======================================================

0805

今天發現還有一種更正統的做法咧

目前還沒研究出來

研究出來一定貼出來的

(看到上面的code，金害，不知道有沒有誤導人了咧)