testes.Histograma.java Source code

Introduction

Here is the source code for testes.Histograma.java

Source

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package testes;

import java.io.File;
import java.io.IOException;
import javax.swing.JPanel;

import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.ChartUtilities;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.XYBarRenderer;
import org.jfree.data.statistics.HistogramDataset;
import org.jfree.data.xy.IntervalXYDataset;
import org.jfree.ui.ApplicationFrame;
import org.jfree.ui.RefineryUtilities;

/**
 *
 * @author Naiane
 */
public class Histograma extends ApplicationFrame {

    public Histograma(String title) {
        super(title);
        JPanel chartPanel = crearPanel();
        chartPanel.setPreferredSize(new java.awt.Dimension(500, 475));
        setContentPane(chartPanel);
    }

    private static IntervalXYDataset crearDataset() {
        //guarda os dados do histograma
        HistogramDataset dados = new HistogramDataset();
        int classes, min, max;

        //valores da amos
        //double amostra[] = {7,8,9,10,10,10.2,10.8,11,12,12};
        double amostra[] = { 89, 85, 93, 81, 77, 83, 87, 81, 83, 89, 81, 86, 80, 84, 82 };
        if (amostra.length <= 25) {
            classes = 5;
        } else {
            classes = (int) Math.round(Math.sqrt(amostra.length));
        }

        dados.addSeries("Frequncias da Amostra", amostra, classes, 77, 95);
        return dados;
    }

    private static JFreeChart crearChart(IntervalXYDataset dataset) {
        JFreeChart chart = ChartFactory.createHistogram("Histograma", null, null, dataset, PlotOrientation.VERTICAL,
                true, true, false);
        XYPlot plot = (XYPlot) chart.getPlot();
        XYBarRenderer renderer = (XYBarRenderer) plot.getRenderer();
        renderer.setDrawBarOutline(true);
        return chart;
    }

    public static JPanel crearPanel() {
        JFreeChart chart = crearChart(crearDataset());
        return new ChartPanel(chart);
    }

    public static void main(String[] args) throws IOException {
        Histograma histo = new Histograma("Histograma");
        histo.pack();
        RefineryUtilities.centerFrameOnScreen(histo);
        histo.setVisible(true);
    }
}