How to "erase" an image from the screen

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How to "erase" an image from the screen

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#1 by (1 votes)

2

In this code I would like to delete the image that I put before and not stay one on top of the other.

    Graphics g = getGraphics();
    Graphics bbg = backBuffer.getGraphics();

    bbg.drawImage(fundo.getImage(), 0, 0, this);

    for(int i = 0; i <= 1; i++)
    {
        ImageIcon playerMoving = new ImageIcon("Imagens/andando-" + i + ".png");

        bbg.drawImage(playerMoving.getImage(), 0, 400, this);
    }

    g.drawImage(backBuffer, 0, 0, this);

java

asked by anonymous 21.07.2015 / 20:52

1 answer

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score 1 · Answer 1

Try this:

g.clearRect(x, y, width, height);

Clears the specified rectangle by filling it with the background color of the   current drawing surface. This operation does not use paint mode   current.

Beginning with Java 1.1, the background color of offscreen images   may depend on the system. Apps should use setColor followed   of fillRect to ensure that an off-screen image is   a specific color.

Click here to see the documentation!

[UPDATE]

In this code above, this will work because you are painting the same canvas within a for .

There are several ways to do this animation!

Here is an example using repaint() of a JComponent through Thread :

import java.awt.Graphics;
import java.awt.Image;
import java.awt.Toolkit;
import java.awt.image.ImageObserver;

import javax.swing.JComponent;
import javax.swing.JFrame;

public class Animation extends JComponent implements Runnable, ImageObserver {
    private static final long serialVersionUID = 333L;
    /**
     * Controla/Conta qual frame está sendo exibido
     */
    public int frame = 0;
    /**
     * Entre as animações
     */
    public int delay = 99;
    /**
     * Sequencia de imagem que vamos exibir
     */
    Image[] split = new Image[5];
    /**
     * Responsável por redesenhar a tela!
     */
    Thread animatorThread;
    /**
     * Inicializando as sequencia de imagens e Thread que realiza o controle
     */
    public void init() {
        split[0] = Toolkit.getDefaultToolkit().getImage("0.png");
        split[1] = Toolkit.getDefaultToolkit().getImage("1.png");
        split[2] = Toolkit.getDefaultToolkit().getImage("2.png");
        split[3] = Toolkit.getDefaultToolkit().getImage("3.png");
        split[4] = Toolkit.getDefaultToolkit().getImage("4.png");
        animatorThread = new Thread(this);
        animatorThread.start();
    }
    public void run() {
        while (frame != 999) {
            /**
             * Re pinta a tela 
             */
            repaint();
            frame++;
            try {
                Thread.sleep(delay);
            } catch (final InterruptedException e) {
                e.printStackTrace();
                break;
            }
        }
    }

    public void paint(final Graphics g) {
        /**
         * Utilizamos o resto da divisão por cinco para pegar a posição
         */
        int i = frame % 5;
        // e printa a imagem
        g.drawImage(split[i], 10, 10, this);
    }

    public static class Graphics2DDrawImage {
        public static void main(String[] a) {
            JFrame window = new JFrame();
            window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            window.setBounds(30, 30, 300, 300);
            final Animation animation = new Animation();
            window.getContentPane().add(animation);
            window.setVisible(true);
            animation.init();
        }
    }
}