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JFreeChart-LogAxis-対数軸

Posted at

目次 ⇒ JFreeChartサンプル

package jp.avaj.lib.chart;

import org.jfree.chart.ChartFrame;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.LogAxis;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.plot.Plot;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.StandardXYItemRenderer;
import org.jfree.chart.renderer.xy.XYItemRenderer;
import org.jfree.data.xy.XYDataset;
import org.jfree.data.xy.XYSeries;
import org.jfree.data.xy.XYSeriesCollection;

/**
■ JFreeChart-LogAxis-対数軸

 */
public class Chart18_04 {
  // 目次-ガAxis,目盛、グリッド.
  A_Chart18 a_Chart18;
  // 目次-Artery-JFreeChart用のライブラリ
  A_Chart00 a_LibChartSampeContents;

  public static void main(String[] args) {
    // 表示データを生成
    XYDataset dataset = createDataset();
    // X軸を生成
    ValueAxis xAxis = new NumberAxis();

    // Y軸はLogAxisを使用する
    LogAxis yAxis = new LogAxis();
    // 対数の底を指定できる⇒指定しなければ10となる
    yAxis.setBase(2.0D);
    // レンダラ
    XYItemRenderer renderer = new StandardXYItemRenderer();
    // Plotを生成してチャートを表示する
    XYPlot xyPlot = new XYPlot(dataset,xAxis,yAxis,renderer);
    JFreeChart jfreeChart = new JFreeChart("対数軸",(Plot)xyPlot);
    ChartFrame cFrame = new ChartFrame("対数軸",(JFreeChart)jfreeChart);
    cFrame.pack();
    cFrame.setVisible(true);
  }
  private static XYDataset createDataset() {
    XYSeriesCollection dataset = new XYSeriesCollection();
    // 一本目
    XYSeries xySeries = new XYSeries("data-0");
    for (int j=0; j<10; j++) {
    	xySeries.add(j,1000*(j+Math.random()*4.0D));
    }
    dataset.addSeries(xySeries);
    // 二本目
    xySeries = new XYSeries("data-1");
    for (int j=0; j<10; j++) {
    	xySeries.add(j,1000*(9-j+Math.random()*4.0D));
    }
    dataset.addSeries(xySeries);
    return dataset;
  }
}


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