我本来像写一个时钟的程序，中间有一部分是就是做一个旋转的指针来指示时间，但是一直不成功，希望各位高手指点.
指针旋转我精简了一下，表述如下，如有拼写错误可能是我打错字，请高手自己更改，主要是对方法进行修改，即实现一个路径自动旋转的图形。谢！//首先是载入各个需要的包
import java.awt.geom.GeneralPath;
import java.awt.Graphics;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JFrame;
import javax.swing.Timer;//我要写的类
public class Clock_Test extends JFrame
{
Clock_Test() //构造方法
{
setSize(300,300);
setBackground(Color.BLACK);
setLocaiion(200,200);
setResizable(false);
setVisible(true);
//定义一个事件，然后在加载repaint()
ActionListener generalpath = new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
repaint();
}
};
new Timer(2000,generalpath).start(); //做一个时间片的循环
}
public void paint(Graphics g)
{
Graphics2D g2d = (Graphics2D)g;
//创建一个路径
GeneralPath path = new GeneralPath();
path.moveTo(100,100);
path.lineTo(150,150);
path.closePath();
Double RAD = Math.PI/180; g2d.translate(100,100); //将旋转中心先平移到点（100，100）
g.setColor(getBackground());
g2d.draw(path); //去掉之前画的路径
g2d.rotate(10*RAD); //让他旋转一定的角度
g.setColor(Color.blue);
g2d.draw(path); //将颜色设定为blue后旋转
} public static void main(String args[])
{
Clock_Test clocktest = new Clock_Test();
clocktest.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}/*
我在我机器上编译后都没有什么问题，但是执行后只看到一条线，而不是旋转的线，我想了很久也不知到原因，忘高手指点
*/
指针旋转我精简了一下，表述如下，如有拼写错误可能是我打错字，请高手自己更改，主要是对方法进行修改，即实现一个路径自动旋转的图形。谢！//首先是载入各个需要的包
import java.awt.geom.GeneralPath;
import java.awt.Graphics;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JFrame;
import javax.swing.Timer;//我要写的类
public class Clock_Test extends JFrame
{
Clock_Test() //构造方法
{
setSize(300,300);
setBackground(Color.BLACK);
setLocaiion(200,200);
setResizable(false);
setVisible(true);
//定义一个事件，然后在加载repaint()
ActionListener generalpath = new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
repaint();
}
};
new Timer(2000,generalpath).start(); //做一个时间片的循环
}
public void paint(Graphics g)
{
Graphics2D g2d = (Graphics2D)g;
//创建一个路径
GeneralPath path = new GeneralPath();
path.moveTo(100,100);
path.lineTo(150,150);
path.closePath();
Double RAD = Math.PI/180; g2d.translate(100,100); //将旋转中心先平移到点（100，100）
g.setColor(getBackground());
g2d.draw(path); //去掉之前画的路径
g2d.rotate(10*RAD); //让他旋转一定的角度
g.setColor(Color.blue);
g2d.draw(path); //将颜色设定为blue后旋转
} public static void main(String args[])
{
Clock_Test clocktest = new Clock_Test();
clocktest.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}/*
我在我机器上编译后都没有什么问题，但是执行后只看到一条线，而不是旋转的线，我想了很久也不知到原因，忘高手指点
*/
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import java.util.*;
import java.awt.*;
import java.applet.*;
import java.text.*;
public class Clock extends Applet implements Runnable{
/**
*
*/
private static final long serialVersionUID = 1L;
private volatile Thread timer; // The thread that displays clock
private int lastxs, lastys, lastxm,
lastym, lastxh, lastyh; // Dimensions used to draw hands
private SimpleDateFormat formatter; // Formats the date displayed
private String lastdate; // String to hold date displayed
private Font clockFaceFont; // Font for number display on clock
private Date currentDate; // Used to get date to display
private Color handColor; // Color of main hands and dial
private Color numberColor; // Color of second hand and numbers
private int xcenter = 80, ycenter = 55; // Center position
public void init() {
int x,y;
lastxs = lastys = lastxm = lastym = lastxh = lastyh = 0;
formatter = new SimpleDateFormat ("EEE MMM dd hh:mm:ss yyyy",
Locale.getDefault());
currentDate = new Date();
lastdate = formatter.format(currentDate);
clockFaceFont = new Font("Serif", Font.PLAIN, 14);
handColor = Color.blue;
numberColor = Color.darkGray;
try
{
setBackground(new Color(Integer.parseInt(getParameter("bgcolor"),
16)));
}catch (NullPointerException e) {
}catch (NumberFormatException e) {
}
try{
handColor = new Color(Integer.parseInt(getParameter("fgcolor1"),
16));
}catch (NullPointerException e) {
}catch (NumberFormatException e) {
}
try{
numberColor = new Color(Integer.parseInt(getParameter("fgcolor2"),
16));
}catch (NullPointerException e) {
}catch (NumberFormatException e) {
}
resize(300,300); // Set clock window size
}
// Paint is the main part of the program
public void update(Graphics g) {
int xh, yh, xm, ym, xs, ys;
int s = 0, m = 10, h = 10;
String today;
currentDate = new Date();
formatter.applyPattern("s");
try {
s = Integer.parseInt(formatter.format(currentDate));
} catch (NumberFormatException n) {
s = 0;
}
formatter.applyPattern("m");
try {
m = Integer.parseInt(formatter.format(currentDate));
} catch (NumberFormatException n) {
m = 10;
}
formatter.applyPattern("h");
try {
h = Integer.parseInt(formatter.format(currentDate));
} catch (NumberFormatException n) {
h = 10;
}
// Set position of the ends of the hands
xs = (int) (Math.cos(s * Math.PI / 30 - Math.PI / 2) * 45 + xcenter);
ys = (int) (Math.sin(s * Math.PI / 30 - Math.PI / 2) * 45 + ycenter);
xm = (int) (Math.cos(m * Math.PI / 30 - Math.PI / 2) * 40 + xcenter);
ym = (int) (Math.sin(m * Math.PI / 30 - Math.PI / 2) * 40 + ycenter);
xh = (int) (Math.cos((h*30 + m / 2) * Math.PI / 180 - Math.PI / 2) * 30
+ xcenter);
yh = (int) (Math.sin((h*30 + m / 2) * Math.PI / 180 - Math.PI / 2) * 30
+ ycenter);
// Get the date to print at the bottom
formatter.applyPattern("EEE MMM dd HH:mm:ss yyyy");
today = formatter.format(currentDate);
g.setFont(clockFaceFont);
// Erase if necessary
g.setColor(getBackground());
if (xs != lastxs || ys != lastys) {
g.drawLine(xcenter, ycenter, lastxs, lastys);
g.drawString(lastdate, 5, 125);
}
if (xm != lastxm || ym != lastym) {
g.drawLine(xcenter, ycenter-1, lastxm, lastym);
g.drawLine(xcenter-1, ycenter, lastxm, lastym);
}
if (xh != lastxh || yh != lastyh) {
g.drawLine(xcenter, ycenter-1, lastxh, lastyh);
g.drawLine(xcenter-1, ycenter, lastxh, lastyh);
}
// Draw date and hands
g.setColor(numberColor);
g.drawString(today, 5, 125);
g.drawLine(xcenter, ycenter, xs, ys);
g.setColor(handColor);
g.drawLine(xcenter, ycenter-1, xm, ym);
g.drawLine(xcenter-1, ycenter, xm, ym);
g.drawLine(xcenter, ycenter-1, xh, yh);
g.drawLine(xcenter-1, ycenter, xh, yh);
lastxs = xs; lastys = ys;
lastxm = xm; lastym = ym;
lastxh = xh; lastyh = yh;
lastdate = today;
currentDate = null;
}
public void paint(Graphics g) {
g.setFont(clockFaceFont);
// Draw the circle and numbers
g.setColor(handColor);
g.drawArc(xcenter-50, ycenter-50, 100, 100, 0, 360);
g.setColor(numberColor);
g.drawString("9", xcenter-45, ycenter+3);
g.drawString("3", xcenter+40, ycenter+3);
g.drawString("12", xcenter-5, ycenter-37);
g.drawString("6", xcenter-3, ycenter+45);
// Draw date and hands
g.setColor(numberColor);
g.drawString(lastdate, 5, 125);
g.drawLine(xcenter, ycenter, lastxs, lastys);
g.setColor(handColor);
g.drawLine(xcenter, ycenter-1, lastxm, lastym);
g.drawLine(xcenter-1, ycenter, lastxm, lastym);
g.drawLine(xcenter, ycenter-1, lastxh, lastyh);
g.drawLine(xcenter-1, ycenter, lastxh, lastyh);
}
public void start() {
timer = new Thread(this);
timer.start();
}
public void stop() {
timer = null;
}
public void run() {
Thread me = Thread.currentThread();
while (timer == me) {
try {
Thread.currentThread().sleep(100);
} catch (InterruptedException e) {
}
repaint();
}
}
public String getAppletInfo() {
return "Title: A Clock \n"
+ "Author: Rachel Gollub, 1995 \n"
+ "An analog clock.";
}
public String[][] getParameterInfo() {
String[][] info = {
{"bgcolor", "hexadecimal RGB number",
"The background color. Default is the color of your browser."},
{"fgcolor1", "hexadecimal RGB number",
"The color of the hands and dial. Default is blue."},
{"fgcolor2", "hexadecimal RGB number",
"The color of the second hand and numbers. Default is dark gray."}
};
return info;
}
}