Saltare e lacerazione in Animazione Java

Question

il seguente codice disegna un quadrato con due piccole quadrato rotazione al suo interno. ogni volta che si fa clic su una freccia sulla tastiera, l'intero sistema si muoverà in quella direzione. tuttavia sto avendo alcuni problemi con la lacerazione dell'immagine ea volte saltando (il suo piccolo ma ancora). Mi chiedevo se qualcuno sapeva come ho potuto risolvere questi problemi w / o in maniera massiccia modifica del codice.

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import static java.awt.Color.*;

public class GUI extends JPanel implements ActionListener, KeyListener
{
    int x, y, x1, y1, x2, y2, changeX, changeY, changeX2, changeY2;
    JFrame frame;
    Runtime r;
    public static void main(String[] args)
    {
        new GUI();
    }
    public GUI()
    {
        try
        {
            UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
        } catch (Exception e)
        {
            e.printStackTrace();
        }

        setSize(1020,770);
        setBackground(WHITE);
        setOpaque(true);
        setVisible(true);

        x = 0;
        y = 0;
        x1 = 0;
        y1 = 0;
        x2 = 0;
        y2 = 0;
        changeX=1;
        changeY=0;
        changeX2=1;
        changeY2=0;
        r = Runtime.getRuntime();

        frame = new JFrame();
        frame.setSize(1020,819);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setJMenuBar(createMenuBar());
        frame.validate();
        frame.setBackground(WHITE);
        frame.addKeyListener(this);
        frame.setTitle("GUI");
        frame.setContentPane(this);
        frame.setVisible(true);
        frame.createBufferStrategy(2);

        Timer t = new Timer(100,this);
        t.setActionCommand("Draw");
        t.start();

        repaint();
    }
    public JMenuBar createMenuBar()
    {
        JMenuBar menuBar = new JMenuBar();

        JMenu fileMenu = new JMenu("File");
        JMenuItem save = new JMenuItem("Save");
        save.setMnemonic(KeyEvent.VK_S);
        save.setContentAreaFilled(false);
        save.setOpaque(false);
        save.addActionListener(this);
        JMenuItem load = new JMenuItem("Load");
        load.setMnemonic(KeyEvent.VK_L);
        load.setContentAreaFilled(false);
        load.setOpaque(false);
        load.addActionListener(this);
        JMenuItem quit = new JMenuItem("Quit");
        quit.setMnemonic(KeyEvent.VK_Q);
        quit.setContentAreaFilled(false);
        quit.setOpaque(false);
        quit.addActionListener(this);
        fileMenu.add(save);
        fileMenu.add(load);
        fileMenu.addSeparator();
        fileMenu.add(quit);
        fileMenu.setContentAreaFilled(false);
        fileMenu.setBorderPainted(false);
        fileMenu.setOpaque(false);

        JMenu editMenu = new JMenu("Edit");
        JMenuItem undo = new JMenuItem("Undo");
        undo.setMnemonic(KeyEvent.VK_U);
        undo.setContentAreaFilled(false);
        undo.setOpaque(false);
        undo.addActionListener(this);
        JMenuItem redo = new JMenuItem("Redo");
        redo.setMnemonic(KeyEvent.VK_R);
        redo.setContentAreaFilled(false);
        redo.setOpaque(false);
        redo.addActionListener(this);
        editMenu.add(undo);
        editMenu.add(redo);
        editMenu.setContentAreaFilled(false);
        editMenu.setBorderPainted(false);
        editMenu.setOpaque(false);

        JMenu helpMenu = new JMenu("Help");
        JMenuItem controls = new JMenuItem("Controls");
        controls.setMnemonic(KeyEvent.VK_C);
        controls.setContentAreaFilled(false);
        controls.setOpaque(false);
        controls.addActionListener(this);
        JMenuItem about = new JMenuItem("About");
        about.setMnemonic(KeyEvent.VK_A);
        about.setContentAreaFilled(false);
        about.setOpaque(false);
        about.addActionListener(this);
        helpMenu.add(controls);
        helpMenu.addSeparator();
        helpMenu.add(about);
        helpMenu.setContentAreaFilled(false);
        helpMenu.setBorderPainted(false);
        helpMenu.setOpaque(false);

        menuBar.add(fileMenu);
        menuBar.add(editMenu);
        menuBar.add(helpMenu);
        return menuBar;
    }
    public void paintComponent(Graphics g)
    {
        g.clearRect(0, 0, 1020, 770);
        g.setColor(BLACK);
        g.fillRect(x,y,100,100);
        g.setColor(RED);
        g.fillRect(x1,y1,50,50);
        g.setColor(BLUE);
        g.fillRect(x2,y2,25,25);
        g.dispose();
    }
    public void change()
    {
        if(x1>=x+50&&changeY==0&&changeX==1)
        {
            changeX=0;
            changeY=1;
        }
        else if(y1>=y+50&&changeX==0&&changeY==1)
        {
            changeX=-1;
            changeY=0;
        }
        else if(x1<=x&&changeX==-1&&changeY==0)
        {
            changeX=0;
            changeY=-1;
        }
        else if(y1<=y&&changeY==-1&&changeX==0)
        {
            changeX=1;
            changeY=0;
        }
        x1+=changeX*5;
        y1+=changeY*5;
    }
    public void change2()
    {
        if(x2>=x1+25&&changeY2==0&&changeX2==1)
        {
            changeX2=0;
            changeY2=1;
        }
        else if(y2>=y1+25&&changeX2==0&&changeY2==1)
        {
            changeX2=-1;
            changeY2=0;
        }
        else if(x2<=x1&&changeX2==-1&&changeY2==0)
        {
            changeX2=0;
            changeY2=-1;
        }
        else if(y2<=y1&&changeY2==-1&&changeX2==0)
        {
            changeX2=1;
            changeY2=0;
        }
        x2+=changeX2*2;
        y2+=changeY2*2;
    }
    public void actionPerformed(ActionEvent e)
    {
        if(e.getActionCommand().equalsIgnoreCase("Draw"))
        {
            r.runFinalization();
            r.gc();
            change();
            change2();
            repaint();
        }
    }
    public void keyPressed(KeyEvent e)
    {
        if(e.getKeyCode()==KeyEvent.VK_UP)
        {
            if(y-10>=0)
            {
                y-=10;
                y1-=10;
                y2-=10;
            }
        }
        if(e.getKeyCode()==KeyEvent.VK_DOWN)
        {
            if(y+110<=getHeight())
            {
                y+=10;
                y1+=10;
                y2+=10;
            }
        }
        if(e.getKeyCode()==KeyEvent.VK_LEFT)
        {
            if(x-10>=0)
            {
                x-=10;
                x1-=10;
                x2-=10;
            }
        }
        if(e.getKeyCode()==KeyEvent.VK_RIGHT)
        {
            if(x+110<=getWidth())
            {
                x+=10;
                x1+=10;
                x2+=10;
            }
        }
        repaint();
    }
    public void keyReleased(KeyEvent e)
    {
    }
    public void keyTyped(KeyEvent e)
    {
    }
}

Answer 1

Non si sta costruendo sul EDT . Un'istanza di javax.swing.Timer rende questo facile, come il gestore di eventi esegue l'azione sul EDT .

Addendum 1: possono è necessario decidere doppio buffering , ma prima confrontare il codice qui sotto al tuo e vedere. Se seguire questa strada, si potrebbe guardare a questo .

Addendum 2: L'esempio seguente mostra come mantenere un buffer fuori schermo, ma a volte è più semplice utilizzare la JPanel(boolean isDoubleBuffered) di costruzione per un effetto simile.

import java.awt.event.KeyAdapter;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.Timer;
import static java.awt.Color.*;

/** @see http://stackoverflow.com/questions/2114455 */
public class GUI extends JPanel implements ActionListener {

    int x, y, x1, y1, x2, y2, changeY, changeY2;
    int changeX = 1; int changeX2 = 1;
    Timer t = new Timer(100, this);

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {

            @Override
            public void run() {
                new GUI(true).display();
            }
        });
    }

    public GUI(boolean doubleBuffered) {
        super(doubleBuffered);
        this.setPreferredSize(new Dimension(320, 240));
    }

    private void display() {
        JFrame frame = new JFrame("GUI");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.addKeyListener(new KeyListener());
        frame.add(this);
        frame.pack();
        frame.setVisible(true);
        t.start();
    }

    @Override
    public void paintComponent(Graphics g) {
        g.setColor(WHITE);
        g.fillRect(0, 0, getWidth(), getHeight());
        g.setColor(BLACK);
        g.fillRect(x, y, 100, 100);
        g.setColor(RED);
        g.fillRect(x1, y1, 50, 50);
        g.setColor(BLUE);
        g.fillRect(x2, y2, 25, 25);
    }

    public void change() {
        if (x1 >= x + 50 && changeY == 0 && changeX == 1) {
            changeX = 0;
            changeY = 1;
        } else if (y1 >= y + 50 && changeX == 0 && changeY == 1) {
            changeX = -1;
            changeY = 0;
        } else if (x1 <= x && changeX == -1 && changeY == 0) {
            changeX = 0;
            changeY = -1;
        } else if (y1 <= y && changeY == -1 && changeX == 0) {
            changeX = 1;
            changeY = 0;
        }
        x1 += changeX * 5;
        y1 += changeY * 5;
    }

    public void change2() {
        if (x2 >= x1 + 25 && changeY2 == 0 && changeX2 == 1) {
            changeX2 = 0;
            changeY2 = 1;
        } else if (y2 >= y1 + 25 && changeX2 == 0 && changeY2 == 1) {
            changeX2 = -1;
            changeY2 = 0;
        } else if (x2 <= x1 && changeX2 == -1 && changeY2 == 0) {
            changeX2 = 0;
            changeY2 = -1;
        } else if (y2 <= y1 && changeY2 == -1 && changeX2 == 0) {
            changeX2 = 1;
            changeY2 = 0;
        }
        x2 += changeX2 * 2;
        y2 += changeY2 * 2;
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        change();
        change2();
        repaint();
    }

    private class KeyListener extends KeyAdapter {

        @Override
        public void keyPressed(KeyEvent e) {
            int d = 5;
            if (e.getKeyCode() == KeyEvent.VK_UP) {
                if (y - d >= 0) {
                    y -= d;
                    y1 -= d;
                    y2 -= d;
                }
            }
            if (e.getKeyCode() == KeyEvent.VK_DOWN) {
                if (y + 100 + d <= getHeight()) {
                    y += d;
                    y1 += d;
                    y2 += d;
                }
            }
            if (e.getKeyCode() == KeyEvent.VK_LEFT) {
                if (x - d >= 0) {
                    x -= d;
                    x1 -= d;
                    x2 -= d;
                }
            }
            if (e.getKeyCode() == KeyEvent.VK_RIGHT) {
                if (x + 100 + d <= getWidth()) {
                    x += d;
                    x1 += d;
                    x2 += d;
                }
            }
        }
    }
}

Answer 2

Vorrei dare un'occhiata a doppio buffer. In sostanza, si disegna a una grafica fuori schermo oggetto e quindi disegnare la grafica fuori schermo oggetto sulla grafica del JPanel oggetto.

~ Bolt