package java2d;import java.awt.*;import java.awt.image.BufferedImage;import javax.swing.JPanel;import javax.swing.border.EtchedBorder;import javax.swing.border.TitledBorder;/** * Displays the time for a Surface to paint. Displays the number * of frames per second on animated demos.  Up to four surfaces fit * in the display area. */public class PerformanceMonitor extends JPanel {    Surface surf;    public PerformanceMonitor() {        setLayout(new BorderLayout());        setBorder(new TitledBorder(new EtchedBorder(), "實(shí)時(shí)數(shù)據(jù)"));        add(surf = new Surface());    }    public class Surface extends JPanel implements Runnable {        public Thread thread;        private BufferedImage bimg;        //private Font font = new Font("Times New Roman", Font.PLAIN, 12);        private Font font = new Font("serif", Font.PLAIN, 12);        private JPanel panel;        public Surface() {            setBackground(Color.black);            /* addMouseListener(new MouseAdapter() {                 public void mouseClicked(MouseEvent e) {                     if (thread == null) start(); else stop();                 }             });             */        }        public Dimension getMinimumSize() {            return getPreferredSize();        }        public Dimension getMaximumSize() {            return getPreferredSize();        }        public Dimension getPreferredSize() {            int textH = getFontMetrics(font).getHeight();            return new Dimension(135, 2 + textH * 8);        }        public void paint(Graphics g) {            if (bimg != null) {                g.drawImage(bimg, 0, 0, this);            }        }        public void start() {            thread = new Thread(this);            thread.setPriority(Thread.MIN_PRIORITY);            thread.setName("PerformanceMonitor");            thread.start();        }        public synchronized void stop() {            thread = null;            setSurfaceState();            notify();        }        public void setSurfaceState() {            if (panel == null) {                return;            }            Component cmps[] = panel.getComponents();            for (int i = 0; i < cmps.length; i++) {                if (((DemoPanel) cmps[i]).surface != null) {                    ((DemoPanel) cmps[i]).surface.setMonitor(thread != null);                }            }        }        public void setPanel(JPanel panel) {            this.panel = panel;        }        public void run() {            Thread me = Thread.currentThread();            while (thread == me && !isShowing() || getSize().width == 0) {                try {                    thread.sleep(500);                } catch (InterruptedException e) {                    return;                }            }            Dimension d = getSize();            bimg = (BufferedImage) createImage(d.width, d.height);            Graphics2D big = bimg.createGraphics();            big.setFont(font);            FontMetrics fm = big.getFontMetrics();            int ascent = fm.getAscent();            int descent = fm.getDescent();            setSurfaceState();            while (thread == me && isShowing()) {                big.setBackground(getBackground());                big.clearRect(0, 0, d.width, d.height);                if (panel == null) {                    continue;                }                Component cmps[] = panel.getComponents();                big.setColor(Color.green);                int ssH = 1;                for (int i = 0; i < cmps.length; i++) {                    if (((DemoPanel) cmps[i]).surface != null) {                        String pStr = ((DemoPanel) cmps[i]).surface.perfStr;                        String pStrMa = ((DemoPanel) cmps[i]).surface.perfStrMa;                        if (pStr != null) {                            ssH += ascent;                            big.drawString(pStr, 4, ssH + 1);                            ssH += descent;                        }                        if (pStrMa != null) {                            ssH += ascent;                            big.drawString(pStrMa, 4, ssH + 1);                            ssH += descent;                        }                    }                }                repaint();                try {                    thread.sleep(500);                } catch (InterruptedException e) {                    break;                }            }            thread = null;        }    } // End Surface} // End PeformanceMonitor