union de polygones

Salut,

passe par la classe java.awt.geom.Area qui permet de faire ce que tu veux

Voici un exemple assez simple de ce que tu peux faire (Je l'ai trouvé sur le web) :
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.Shape;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.awt.geom.Area;
import java.awt.geom.Ellipse2D;
import java.awt.geom.Rectangle2D;

import javax.swing.JComboBox;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class CombiningShapes extends JComponent {
  private Shape mShapeOne, mShapeTwo;

  private JComboBox mOptions;

  public CombiningShapes() {
    mShapeOne = new Ellipse2D.Double(40, 20, 80, 80);
    mShapeTwo = new Rectangle2D.Double(60, 40, 80, 80);
    setBackground(Color.white);
    setLayout(new BorderLayout());

    JPanel controls = new JPanel();

    mOptions = new JComboBox(new String[] { "outline", "add",
        "intersection", "subtract", "exclusive or" });

    mOptions.addItemListener(new ItemListener() {
      public void itemStateChanged(ItemEvent ie) {
        repaint();
      }
    });
    controls.add(mOptions);
    add(controls, BorderLayout.SOUTH);
  }

  public void paintComponent(Graphics g) {
    Graphics2D g2 = (Graphics2D) g;
    g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
        RenderingHints.VALUE_ANTIALIAS_ON);

    String option = (String) mOptions.getSelectedItem();
    if (option.equals("outline")) {
      // draw the outlines and return.
      g2.draw(mShapeOne);
      g2.draw(mShapeTwo);
      return;
    }

    // Create Areas from the shapes.
    Area areaOne = new Area(mShapeOne);
    Area areaTwo = new Area(mShapeTwo);
    // Combine the Areas according to the selected option.
    if (option.equals("add"))
      areaOne.add(areaTwo);
    else if (option.equals("intersection"))
      areaOne.intersect(areaTwo);
    else if (option.equals("subtract"))
      areaOne.subtract(areaTwo);
    else if (option.equals("exclusive or"))
      areaOne.exclusiveOr(areaTwo);

    // Fill the resulting Area.
    g2.setPaint(Color.orange);
    g2.fill(areaOne);
    // Draw the outline of the resulting Area.
    g2.setPaint(Color.black);
    g2.draw(areaOne);
  }
 
  public static void main(String[] args) {
      JFrame.setDefaultLookAndFeelDecorated(true);
    JFrame f = new JFrame();
    f.setTitle("Test");
    f.setDefaultCloseOperation(3);
    f.add(new CombiningShapes());
    f.setSize(220, 220);
    f.setLocationRelativeTo(null);
    f.setVisible(true);
  }
 
}



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