[jFreeChart] jFreeChart (Bubble Chart ) 사용법

import java.io.*
import java.awt.Font
import java.awt.Color
improt java.awt.GradientPaint
       
import org.jfree.chart.ChartFactory
import org.jfree.chart.ChartPanel
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.ChartRenderingInfo
import org.jfree.chart.ChartUtilities
import org.jfree.chart.plot.CategoryPlot
       
import org.jfree.data.xy.MatrixSeriesCollection>
import org.jfree.data.xy.NormalizedMatrixSeries
import org.jfree.ui.ApplicationFrame
import org.jfree.ui.RefineryUtilities

  final int SIZE = 20;
  final MatrixSeriesCollection dataset = new MatrixSeriesCollection();
  
  // value, x, y
  int[][] itmes = {
       {200, 3 , 12}
      ,{250, 8 , 5 }
      ,{80 , 14, 16}
      ,{50 , 18, 4 }
  };
  
  int nSum = 0;
  for (int i = 0; i < itmes.length; i++ ) {
    nSum += itmes[i][0];
  }
  
  for (int i = 0; i < itmes.length; i++) {
    NormalizedMatrixSeries newSeries =
              new NormalizedMatrixSeries("대카테고리" + (i+1), SIZE, SIZE);
      newSeries.update(itmes[i][2], itmes[i][1], itmes[i][0]);
    newSeries.setScaleFactor(SIZE*((float)itmes[i][0]/nSum));	
    
    dataset.addSeries(newSeries);
  }
  
  final JFreeChart chart = ChartFactory.createBubbleChart(
      "Bubble Chart"
      , "X축"
      , "Y축"
      , dataset
      , PlotOrientation.VERTICAL
      , true
      , true
      , false);
  
  chart.setBackgroundPaint(Color.white);
  chart.setTitle("제목");
  
  // 제목
  chart.getTitle().setFont(new Font("돋움", Font.BOLD, 15));
  // 범례
  chart.getLegend().setItemFont(new Font("돋움", Font.PLAIN, 12));

  final XYPlot plot = chart.getXYPlot();
  
  Font font = plot.getDomainAxis().getLabelFont();
  // X축 라벨
  plot.getDomainAxis().setLabelFont(new Font("돋움", font.getStyle(), font.getSize()));
  // X축 도메인
  plot.getDomainAxis().setTickLabelFont(new Font("돋움", font.getStyle(), 10));
  
  font = plot.getRangeAxis().getLabelFont();
  // Y축 라벨
  plot.getRangeAxis().setLabelFont(new Font("돋움", font.getStyle(), font.getSize()));
  // Y축 범위
  plot.getRangeAxis().setTickLabelFont(new Font("돋움", font.getStyle(), 10));	
  
  //final XYPlot plot = chart.getXYPlot();
  plot.setForegroundAlpha(0.5f);
  
  final NumberAxis domainAxis = (NumberAxis) plot.getDomainAxis();
  //domainAxis.setLowerBound(-0.5);
  domainAxis.setLowerBound(0);
  
  final NumberAxis rangeAxis = (NumberAxis) plot.getRangeAxis();
  
  // rangeAxis.setInverted(true);  // uncoment to reproduce a bug in jFreeChart
  //rangeAxis.setLowerBound(-0.5);
  rangeAxis.setLowerBound(0);
  
  // 파일 저장
  ChartRenderingInfo info = new ChartRenderingInfo(new StandardEntityCollection());
  String fileName= "C:/" + "bubbleChart.jpg";
  ChartUtilities.saveChartAsJPEG(new File(fileName),chart,600,400,info);