Gestion des transformations
sous Java 2D

RETOUR

Utilisation des transformations géométriques pour la programmation d'une animation.

Transformations.class

Fichiers source

Transformations.java

import java.awt.*;
import java.awt.geom.*;
import java.applet.*;

public class Transformations extends Applet {

  public double a = 0.0 ;
  public double sx = 0.5 ;
  public double sy = 1.0 ;

  public void init() {
    setBackground(Color.white);
    ThreadTransformations tt = new ThreadTransformations(this);
    tt.start();
  }

  public void paint(Graphics g) {
    Graphics2D g2 =(Graphics2D) g;
    AffineTransform at = new AffineTransform();
    at.translate(125.0,125.0);
    at.rotate(a);
    at.scale(sx,sy);
    g2.setTransform(at);
    Rectangle r = new Rectangle(-75,-75,150,150);
    g2.draw(r);
  }

  public String getAppletInfo() {
    return "Transformations geometriques sous Java 2D.";
  }
}

ThreadTransformations.java

public class ThreadTransformations extends Thread {

  private Transformations t ;
  private boolean bRun ;
  private double dx = 0.01 ;
  private double dy = -0.013 ;

  public ThreadTransformations(Transformations trans) {
    super();
    t = trans;
    bRun = false;
  }

  public void run() {
    bRun = true;
    while (bRun) {
      try {
        sleep(15); }
      catch(InterruptedException ie) {} ;
    t.a += 0.01;
    if ( ( t.sx <= 0.3 ) | ( t.sx >= 1.2 ) )
      dx = -dx ;
    t.sx += dx;
    if ( ( t.sy <= 0.3 ) | ( t.sy >= 1.2 ) )
      dy = -dy ;
    t.sy += dy;
    t.repaint(); }
  }
}

 RETOUR