Calcule de distance entre point d'un JFreeChart

**SLAMADHOUHA** · 05/07/2015, 20h39

bonsoir
j'ai implémenté un jfreechart contenant un ensemble de données de ma base. je souhaite calculer la distance entre ces points afin de les regrouper. je sais pas comme le faire. pouvez m'aider s'il vous plaît. voici mon code.

Code java :

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 * 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 systeme;
 
/**
 *
 * @author Performance_Info
 */
import com.util.Connecter;
import java.awt.BasicStroke;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Shape;
 
import java.awt.Stroke;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.text.NumberFormat;
import java.util.Random;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartFrame;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.axis.TickUnitSource;
import org.jfree.chart.labels.StandardXYItemLabelGenerator;
import org.jfree.chart.labels.XYItemLabelGenerator;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.XYItemRenderer;
import org.jfree.chart.renderer.xy.XYLineAndShapeRenderer;
import org.jfree.data.xy.DefaultXYDataset;
import org.jfree.data.xy.XYDataset;
import org.jfree.ui.RefineryUtilities;
import org.jfree.util.ShapeUtilities;
public class jchart extends JFrame {
 
    /**
     * Creates new form chart
     */
    private static final int MAX = 6;
    private static final Random random = new Random();
public jchart() {
 
        try {
            this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 
            final DefaultXYDataset dataset = new DefaultXYDataset();
            dataset.addSeries("notation client/film",createSeries(5));
 
 
            // dataset.addSeries("Series1", createSeries(3));
            JFreeChart chart = createChart(dataset);
            ChartPanel chartPanel = new ChartPanel(chart, false);
            chartPanel.setPreferredSize(new Dimension(640, 480));
            this.add(chartPanel, BorderLayout.CENTER);
 
 
 
        } catch (SQLException ex) {
            Logger.getLogger(jchart.class.getName()).log(Level.SEVERE, null, ex);
        }
    }
 
 
 
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {
 
        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
 
        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 400, Short.MAX_VALUE)
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 300, Short.MAX_VALUE)
        );
 
        pack();
    }// </editor-fold>                        
   public double[][] createSeries(int mean) throws SQLException {
 
            double[][] series = new double[2][MAX];
            double math;
            Connection cnx=Connecter.connecter();
            PreparedStatement st=cnx.prepareStatement("select idclient,idproduit from preference ");
            ResultSet re=st.executeQuery();
            ResultSetMetaData dataset=re.getMetaData();
            int i=1;
            while(re.next())
            {
                series[0][i] = Double.parseDouble(re.getString("idproduit"));
               series[1][i] = Double.parseDouble(re.getString("idclient"));             
            i++;
            }
 
            return series;
 
   }
 
 
 
 
 
 
    private JFreeChart createChart(XYDataset dataset) {
 
        // create the chart...
        JFreeChart chart = ChartFactory.createXYLineChart(
            "CLIENTS/////FILMS", // chart title
            "FILMS", // domain axis label
            "CLIENTS", // range axis label
            dataset,  // initial series
            PlotOrientation.VERTICAL, // orientation
            true, // include legend
            true, // tooltips?
            false // URLs?
            );
 
        // set chart background
        chart.setBackgroundPaint(Color.white);
 
        // set a few custom plot features
        XYPlot plot = (XYPlot) chart.getPlot();
        plot.setBackgroundPaint(new Color(0xffffe0));
        plot.setDomainGridlinesVisible(true);
        plot.setDomainGridlinePaint(Color.lightGray);
        plot.setRangeGridlinePaint(Color.lightGray);
 
        // set the plot's axes to display integers
        TickUnitSource ticks = NumberAxis.createIntegerTickUnits();
        NumberAxis domain = (NumberAxis) plot.getDomainAxis();
        domain.setStandardTickUnits(ticks);
        NumberAxis range = (NumberAxis) plot.getRangeAxis();
        range.setStandardTickUnits(ticks);
 
        // render shapes and lines
        XYLineAndShapeRenderer renderer =
            new XYLineAndShapeRenderer(false, false);
        plot.setRenderer(renderer);
        renderer.setBaseShapesVisible(true);
       renderer.setBaseShapesFilled(true);
       Shape cross = ShapeUtilities.createDiagonalCross(3, 1);
           XYPlot xyPlot = (XYPlot) chart.getPlot();
           renderer.setSeriesShape(0, cross);
 
 
        // set the renderer's stroke
        /*Stroke stroke = new BasicStroke(
            3f, BasicStroke.CAP_ROUND, BasicStroke.JOIN_BEVEL);
        renderer.setBaseOutlineStroke(stroke);*/
 
        // label the points
       /* NumberFormat format = NumberFormat.getNumberInstance();
        format.setMaximumFractionDigits(2);
        XYItemLabelGenerator generator =
            new StandardXYItemLabelGenerator(
                StandardXYItemLabelGenerator.DEFAULT_ITEM_LABEL_FORMAT,
                format, format);
        renderer.setBaseItemLabelGenerator(generator);
        renderer.setBaseItemLabelsVisible(true);*/
 
        return chart;
    }
     /** Main method */
    public static void main(String[] args) {
       javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                jchart demo = new jchart();
                demo.pack();
                demo.setVisible(true);
 
            }
         });
    }
 
 
    // Variables declaration - do not modify                     
    // End of variables declaration                   
 
 
}

**joel.drigo** · 06/07/2015, 09h10

Salut,

Si tu ne connais pas la formule pour calculer la distance entre 2 points, tu peux utiliser tout simplement double distance = java.awt.Point.distance(x1, y1, x2, y2), avec x1 et y1 les coordonnées du premier point et x2 et y2 les coordonnées du second.

Calcule de distance entre point d'un JFreeChart

2D Java

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