摆动速度限制

我有一个很长的重绘操作，我想限速，即确保它最多每N毫秒调用一次。

我目前的解决方案有点令人不满意：我使用一个持续时间很短的Swing Timer ，每当我收到一个事件时我都会restart() 。 这样可确保在N毫秒窗口内发生事件时不会触发重绘（即重绘将在事件发生并且N毫秒“安静”时间段过去后发生）。

我想要的是确保在第一个事件后最多N毫秒调用重绘，并且重绘时间最多为N.任何想法？ （没有记录在已经启动的Timer上调用start的效果）。

Answer 1

那里我只知道来自Native OS的Latency，如果你将溢出这个刷新率然后来自RepaintManager的错误，顺便说一下你的主题非常学术延迟是一个像素/每秒的最大刷新率

但是这个

或者另一个应该是从RepaintManager测试直到/ UpTo第一个错误（然后可能锁定当前JVM实例）的良好基础 来自代码

 import java.awt.*; import java.awt.event.*; import java.util.*; import javax.swing.*; import javax.swing.SwingUtilities; import javax.swing.Timer; public class AnimationBackground { public AnimationBackground() { Random random = new Random(); JFrame frame = new JFrame("Animation Background"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setResizable(false); frame.setLayout(new GridLayout(0, 1, 10, 10)); //frame.setLayout(new GridLayout(0, 3, 10, 10)); //for (int iPanels = 0; iPanels < 3; iPanels++) { for (int iPanels = 0; iPanels < 1; iPanels++) { final MyJPanel panel = new MyJPanel(); panel.setBackground(Color.BLACK); for (int i = 0; i < 100; i++) { Star star = new Star(new Point(random.nextInt(490), random.nextInt(490))); star.setColor(new Color(100 + random.nextInt(155), 100 + random.nextInt(155), 100 + random.nextInt(155))); star.setxIncr(-3 + random.nextInt(7)); star.setyIncr(-3 + random.nextInt(7)); panel.add(star); } panel.setLayout(new GridLayout(10, 1)); JLabel label = new JLabel("This is a Starry background.", JLabel.CENTER); label.setForeground(Color.WHITE); panel.add(label); JPanel stopPanel = new JPanel(); stopPanel.setOpaque(false); stopPanel.add(new JButton(new AbstractAction("Stop this madness!!") { private static final long serialVersionUID = 1L; @Override public void actionPerformed(ActionEvent e) { panel.stopAnimation(); } })); panel.add(stopPanel); JPanel startPanel = new JPanel(); startPanel.setOpaque(false); startPanel.add(new JButton(new AbstractAction("Start moving...") { private static final long serialVersionUID = 1L; @Override public void actionPerformed(ActionEvent e) { panel.startAnimation(); } })); panel.add(startPanel); frame.add(panel); } frame.pack(); frame.setLocationRelativeTo(null); frame.setVisible(true); } public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { @Override public void run() { AnimationBackground animationBackground = new AnimationBackground(); } }); } class Star extends Polygon { private static final long serialVersionUID = 1L; private Point location = null; private Color color = Color.YELLOW; private int xIncr, yIncr; static final int WIDTH = 500, HEIGHT = 500; Star(Point location) { int x = location.x; int y = location.y; this.location = location; this.addPoint(x, y + 8); this.addPoint(x + 8, y + 8); this.addPoint(x + 11, y); this.addPoint(x + 14, y + 8); this.addPoint(x + 22, y + 8); this.addPoint(x + 17, y + 12); this.addPoint(x + 21, y + 20); this.addPoint(x + 11, y + 14); this.addPoint(x + 3, y + 20); this.addPoint(x + 6, y + 12); } public void setColor(Color color) { this.color = color; } public void move() { if (location.x < 0 || location.x > WIDTH) { xIncr = -xIncr; } if (location.y < 0 || location.y > WIDTH) { yIncr = -yIncr; } translate(xIncr, yIncr); location.setLocation(location.x + xIncr, location.y + yIncr); } public void setxIncr(int xIncr) { this.xIncr = xIncr; } public void setyIncr(int yIncr) { this.yIncr = yIncr; } public Color getColor() { return color; } } class MyJPanel extends JPanel { private static final long serialVersionUID = 1L; private ArrayList stars = new ArrayList(); private Timer timer = new Timer(20, new ActionListener() { @Override public void actionPerformed(ActionEvent e) { for (Star star : stars) { star.move(); } repaint(); } }); public void stopAnimation() { if (timer.isRunning()) { timer.stop(); } } public void startAnimation() { if (!timer.isRunning()) { timer.start(); } } @Override public void addNotify() { super.addNotify(); timer.start(); } @Override public void removeNotify() { super.removeNotify(); timer.stop(); } MyJPanel() { this.setPreferredSize(new Dimension(520, 520)); } public void add(Star star) { stars.add(star); } @Override public void paintComponent(Graphics g) { super.paintComponent(g); ((Graphics2D) g).setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); for (Star star : stars) { g.setColor(star.getColor()); g.fillPolygon(star); } } } }