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2114490
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2010-01-22T02:04:37.460
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2011-03-03T23:55:56.417
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You are not constructing on the <a href="http://java.sun.com/docs/books/tutorial/uiswing/concurrency/initial.html" rel="nofollow noreferrer">EDT</a>. An instance of <a href="http://java.sun.com/javase/6/docs/api/javax/swing/Timer.html" rel="nofollow noreferrer"><code>javax.swing.Timer</code></a> makes this easy, as the action event handler executes on the <a href="http://java.sun.com/docs/books/tutorial/uiswing/concurrency/initial.html" rel="nofollow noreferrer">EDT</a>. Addendum 1: You may decide you need <a href="http://java.sun.com/docs/books/tutorial/extra/fullscreen/doublebuf.html" rel="nofollow noreferrer">double buffering</a>, but first compare the code below to yours and see. If you go that route, you might look at this <a href="http://www.stumbleupon.com/su/8wGoxm/www.cokeandcode.com/info/tut2d.html" rel="nofollow noreferrer">tutorial</a>. Addendum 2: The example below shows how to maintain an offscreen buffer, but it is sometimes easier to use the <a href="http://java.sun.com/javase/6/docs/api/javax/swing/JPanel.html#JPanel%28boolean%29" rel="nofollow noreferrer"><code>JPanel(boolean isDoubleBuffered)</code></a> constructor for a similar effect. <pre><code>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; } } } } } </code></pre>
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