animation gif scintillant dans l'applet

Question

Mon animation gif scintille trop. J'ai entendu parler de la double mise en mémoire tampon qui peut aider, mais comment puis-je faire cela à mon animation gif? Ou y a-t-il un meilleur raccourci plus rapide. Ceci est juste une petite chose d'applet de test que je fais pour le plaisir, mais mettra en œuvre les leçons en classe.

Contexte:

import java.net.*; 
import java.applet.Applet; 
import java.awt.*; 
import java.awt.event.*; 
import java.awt.image.BufferedImage; 
import java.io.File; 
import java.io.IOException; 
import java.net.MalformedURLException; 
import java.net.URL; 

import javax.imageio.ImageIO; 
import javax.swing.*; 
public class HiroshimaBlock extends Applet implements ActionListener { 

TextField distanceText = new TextField(10); 
TextField accelerationText = new TextField(10); 
Button security = new Button("Account Manager"); 
Button launch = new Button("LAUNCH!"); 
Button Reportl = new Button("Report Logs"); 
Image dancer; 
URL base; 
MediaTracker mt; 
Timer tm = new Timer(10, this); 

TextArea answers = new TextArea("I am ready for your first trip.", 4, 20, 
     TextArea.SCROLLBARS_NONE); 

Image image; 

@Override 
public void init() { 
    setSize(550, 500); 
    // Some messages for the top of the Applet: 
    addHorizontalLine(Color.orange); 

    addNewLine(); 
    // JOptionPane.showMessageDialog(null, "HiroshimaBlock", 
    // "Welcome to HiroshimaBlock", JOptionPane.PLAIN_MESSAGE); 
    // The two text fields and the launch button: 
    Frame c = (Frame) this.getParent().getParent(); 
    c.setTitle("HiroshimaBlock"); 

    mt = new MediaTracker(this); 
    try { 
     base = getDocumentBase(); 
    } catch (Exception e) { 
    } 
    dancer = getImage(base, "dancer1.gif"); 
    mt.addImage(dancer, 9); 
    try { 
     mt.waitForAll(); 
    } catch (InterruptedException e) { 
    } 

    loadImage(); 
    // add(distanceText); 
    // add(new Label("Distance of trip in light years")); 
    addNewLine(); 
    addNewLine(); 
    // add(accelerationText); 
    // add(new Label("Acceleration of rocket in g's")); 
    addNewLine(); 
    add(launch); 
    addNewLine(); 
    add(security); 
    addNewLine(); 
    add(Reportl); 

    // A text area for printing the answers: 
    // answers.setEditable(false); 
    // add(answers); 
    addNewLine(); 
    addNewLine(); 
    addHorizontalLine(Color.orange); 

} 

public void loadImage() { 

    URL url = getClass().getResource("hsblock.png"); 
    image = getToolkit().getImage(url); 
} 

public void paint(Graphics g) { 
    g.drawImage(image, 20, 20, this); 

    this.security.setLocation(25, 200); 
    addNewLine(); 
    this.launch.setLocation(25, 230); 
    this.Reportl.setLocation(25, 260); 
    this.security.setSize(100, 25); 
    this.launch.setSize(100, 25); 
    this.Reportl.setSize(100, 25); 

    g.drawImage(dancer, 150, 200, this); 
    tm.start(); 
} 

private void addHorizontalLine(Color c) { 
    // Add a Canvas 10000 pixels wide but only 1 pixel high, which acts as 
    // a horizontal line to separate one group of components from the next. 
    Canvas line = new Canvas(); 
    line.setSize(10000, 1); 
    line.setBackground(c); 

    add(line); 
} 

private void addNewLine() { 
    // Add a horizontal line in the background color. The line itself is 
    // invisible, but it serves to force the next Component onto a new line. 
    addHorizontalLine(getBackground()); 
} 

@Override 
public void actionPerformed(ActionEvent arg0) { 
    // TODO Auto-generated method stub 

} 

    } 

Answer 1

Eh bien LOL je l'ai fait arrêter vacillante en utilisant la mise à jour LOLOLOL

import java.applet.*; 
import java.awt.*; 
import java.awt.event.*; 

public class Test extends Applet { 

Image img; 

public void init() { 
    setSize(700, 700); 

    img = getImage(getDocumentBase(), "dancer1.gif"); 

} 

public void update(Graphics g) { 
    g.drawImage(img, 140, 200, this); 
} 

public void paint(Graphics g) { 
    update(g); 
} 

} 

Answer 2

Vous voulez:

• Créer une classe de dessin qui s'étend JPanel (ou JComponent)
• substituez la méthode paintComponent(Graphics g) de votre classe.
• Appelez d'abord la méthode du super dans cette méthode.
• Puis faites votre dessin d'animation avec cette méthode. Cela vous donnera la double mise en mémoire tampon automatique de Swing qui devrait vous aider à lisser votre animation.
• Affichez votre dessin JPanelez votre JApplet en l'ajoutant au contentPane de l'applet.

---

Par exemple:

import java.awt.Color; 
import java.awt.Graphics; 
import java.awt.Graphics2D; 
import java.awt.Image; 
import java.awt.RenderingHints; 
import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 
import java.awt.image.BufferedImage; 
import java.lang.reflect.InvocationTargetException; 
import java.nio.Buffer; 

import javax.swing.*; 

public class SimpleAnimation extends JApplet { 
    @Override 
    public void init() { 
     try { 
     SwingUtilities.invokeAndWait(new Runnable() { 
      public void run() { 
       DrawPanel drawPanel = new DrawPanel(); 
       getContentPane().add(drawPanel); 
      } 
     }); 
     } catch (InvocationTargetException | InterruptedException e) { 
     e.printStackTrace(); 
     } 
    } 
} 

class DrawPanel extends JPanel { 
    private static final int I_WIDTH = 20; 
    private static final int I_HEIGHT = 20; 
    private static final int TIMER_DELAY = 15; 
    private int x = 0; 
    private int y = 0; 
    private BufferedImage img = new BufferedImage(I_WIDTH, I_HEIGHT, BufferedImage.TYPE_INT_ARGB); 

    public DrawPanel() { 
     Graphics2D g2 = img.createGraphics(); 
     g2.setColor(Color.red); 
     g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, 
      RenderingHints.VALUE_ANTIALIAS_ON); 
     g2.fillOval(1, 1, I_WIDTH - 2, I_HEIGHT - 2); 
     g2.dispose(); 

     new Timer(TIMER_DELAY, new TimerListener()).start(); 
    } 

    @Override 
    protected void paintComponent(Graphics g) { 
     super.paintComponent(g); 
     if (img != null) { 
     g.drawImage(img, x, y, this); 
     } 
    } 

    private class TimerListener implements ActionListener { 
     @Override 
     public void actionPerformed(ActionEvent e) { 
     x++; 
     y++; 
     repaint(); 
     } 
    } 
}