所属类别：开发技术

文章作者：cping

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版权声明：原创作品，允许转载，转载时请务必以超链接形式标明文章 原始出处 、作者信息和本声明。否则将追究法律责任。http://cping1982.blog.51cto.com/601635/116709FPS：即帧 /秒(frames per second)的缩写，也称为帧速率。是指1秒钟时间里刷新的图片的帧数，也可以理解为图形处理器每秒钟能够刷新几次。如果具体到手机上就是指每秒钟能够 播放（或者录制）多少格画面。同时越高的帧速率可以得到更流畅、更逼真的动画。每秒钟帧数(fps)越多，所显示的动作就会越流畅。 在绝大多数图形程序中（以游戏类为典型），执行效率都以FPS作为评估标准。 由于目前JAVA方面缺少相关用例，故完成功能如下图(在本机测试中，最大fps设定为500，实际达到FPS效率在IDE中280左右，单独运行380左右，受系统配置等因素影响)：代码如下：（请变更文件后缀为jar）FPS部分相关源码：package org.test;import java.text.DecimalFormat;/** * Title: LoonFramework * Description: * Copyright: Copyright (c) 2007 * Company: LoonFramework * @author chenpeng * @email：ceponline@yahoo.com.cn * @version 0.1 */public class FPSListen {//设定动画的FPS桢数，此数值越高,动画速度越快。public static final int FPS = 500;// 换算为运行周期public static final long PERIOD = (long) (1.0 / FPS * 1000000000); // 单位: ns(纳秒)// FPS最大间隔时间，换算为1s = 10^9nspublic static long FPS_MAX_INTERVAL = 1000000000L; // 单位: ns// 实际的FPS数值private double nowFPS = 0.0;// FPS累计用间距时间private long interval = 0L; // in nsprivate long time;//运行桢累计private long frameCount = 0;//格式化小数位数private DecimalFormat df = new DecimalFormat("0.0");//开启openglpublic void opengl(){System.setProperty("sun.java2d.opengl", "True");System.setProperty("sun.java2d.translaccel", "True");}/** *//** * 制造FPS数据 * */public void makeFPS() {frameCount++;interval += PERIOD;//当实际间隔符合时间时。if (interval >= FPS_MAX_INTERVAL) {//nanoTime()返回最准确的可用系统计时器的当前值，以毫微秒为单位long timeNow = System.nanoTime();// 获得到目前为止的时间距离long realTime = timeNow - time; // 单位: ns//换算为实际的fps数值nowFPS = ((double) frameCount / realTime) * FPS_MAX_INTERVAL;//变更数值frameCount = 0L;interval = 0L;time = timeNow;}}public long getFrameCount() {return frameCount;}public void setFrameCount(long frameCount) {this.frameCount = frameCount;}public long getInterval() {return interval;}public void setInterval(long interval) {this.interval = interval;}public double getNowFPS() {return nowFPS;}public void setNowFPS(double nowFPS) {this.nowFPS = nowFPS;}public long getTime() {return time;}public void setTime(long time) {this.time = time;}public String getFPS(){return df.format(nowFPS);}}球体类相关代码：package org.test;import java.awt.Color;import java.awt.Graphics;/** *//** * Title: LoonFramework * Description: * Copyright: Copyright (c) 2007 * Company: LoonFramework * @author chenpeng * @email：ceponline@yahoo.com.cn * @version 0.1 */public class Ball {private static final int SIZE = 10;private int x, y;protected int vx, vy;public Ball(int x, int y, int vx, int vy) {this.x = x;this.y = y;this.vx = vx;this.vy = vy;}public void move() {x += vx;y += vy;if (x < 0 x > BallPanel.WIDTH - SIZE) {vx = -vx;}if (y < 0 y > BallPanel.HEIGHT - SIZE) {vy = -vy;}}public void draw(Graphics g) {g.setColor(Color.RED);g.fillOval(x, y, SIZE, SIZE);}}FPS及球体处理用代码如下：package org.test;import java.awt.Color;import java.awt.Dimension;import java.awt.Frame;import java.awt.Graphics;import java.awt.Image;import java.awt.Panel;import java.awt.event.WindowAdapter;import java.awt.event.WindowEvent;import java.awt.image.BufferedImage;import java.util.Random;/** *//** * * Title: LoonFramework * * * Description:以JAVA获取FPS用演示程序及随机生成乱数球体。(更优化代码内置于loonframework-game框架中) * * * Copyright: Copyright (c) 2007 * * * Company: LoonFramework * * * @author chenpeng * @email：ceponline@yahoo.com.cn * @version 0.1 */public class BallPanel extends Panel implements Runnable {/** *//** * */private static final long serialVersionUID = 1L;public static final int WIDTH = 360;public static final int HEIGHT = 360;// 设定最大球体数量private static final int NUM_BALLS = 50;// 定义球体数组private Ball[] ball;// 运行状态private volatile boolean running = false;private Thread gameLoop;// 缓存用图形private Graphics bg;private Image screen = null;// 生成随机数private Random rand;// fps监听private FPSListen fps = null;public BallPanel() {setPreferredSize(new Dimension(WIDTH, HEIGHT));screen = new BufferedImage(WIDTH, HEIGHT, 1);bg = screen.getGraphics();fps = new FPSListen();//fps.opengl();// 以当前毫秒生成随机数rand = new Random(System.currentTimeMillis());ball = new Ball[NUM_BALLS];// 初始化球体参数for (int i = 0; i < NUM_BALLS; i++) {int x = rand.nextInt(WIDTH);int y = rand.nextInt(HEIGHT);int vx = rand.nextInt(10);int vy = rand.nextInt(10);ball[i] = new Ball(x, y, vx, vy);}}// 加入Notifypublic void addNotify() {super.addNotify();// 判断循环条件是否成立if (gameLoop == null !running) {gameLoop = new Thread(this);gameLoop.start();}}/** *//** * 进行线程运作。 */public void run() {long beforeTime, afterTime, timeDiff, sleepTime;long overSleepTime = 0L;int noDelays = 0;// 获得精确纳秒时间beforeTime = System.nanoTime();fps.setTime(beforeTime);running = true;while (running) {gameUpdate();repaint();afterTime = System.nanoTime();timeDiff = afterTime - beforeTime;// 换算间隔时间sleepTime = (FPSListen.PERIOD - timeDiff) - overSleepTime;if (sleepTime > 0) {// 制造延迟try {Thread.sleep(sleepTime / 1000000L); // nano->ms} catch (InterruptedException e) {}// 获得延迟时间overSleepTime = (System.nanoTime() - afterTime) - sleepTime;} else {// 重新计算overSleepTime = 0L;// 判断noDelays值if (++noDelays >= 16) {Thread.yield(); // 令线程让步noDelays = 0;}}// 重新获得beforeTimebeforeTime = System.nanoTime();// 制造FPS结果fps.makeFPS();}}/** *//** * 变更球体轨迹 * */private void gameUpdate() {for (int i = 0; i < NUM_BALLS; i++) {ball[i].move();}}/** *//** * 变更图形 */public void update(Graphics g) {paint(g);}/** *//** * 显示图形 */public void paint(Graphics g) {// 设定背景为白色，并清空图形bg.setColor(Color.WHITE);bg.fillRect(0, 0, WIDTH, HEIGHT);// FPS数值显示bg.setColor(Color.BLUE);bg.drawString("FPS: " + fps.getFPS(), 4, 16);// 分别绘制相应球体for (int i = 0; i < NUM_BALLS; i++) {ball[i].draw(bg);}g.drawImage(screen, 0, 0, this);g.dispose();}public static void main(String[] args) {Frame frm = new Frame();frm.setTitle("Java FPS速度测试(由Loonframework框架提供)");frm.setSize(WIDTH, HEIGHT+20);frm.setResizable(false);frm.add(new BallPanel());frm.setVisible(true);frm.addWindowListener(new WindowAdapter(){public void windowClosing(WindowEvent e){System.exit(0);}});}}本文出自 “Java究竟怎么玩” 博客，请务必保留此出处http://cping1982.blog.51cto.com/601635/116709本文出自 51CTO.COM技术博客

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