java模拟时钟（一个庞大的问题）
程序代码：import java.awt.Color;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Calendar;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
import javax.swing.Timer;
public class Clock extends JComponent implements Runnable{
Thread thread;
Calendar currentTime;//当前时间
int hours = 0;
int minutes = 0;
int seconds = 0;
public Clock() {
setBounds(0,0,300,400);
setBackground(Color.PINK);
thread = new Thread();
thread.start();
}
public void PaintClock(Graphics g) {
g.setColor(Color.black);//设置黑色来画时钟
drawHourAndMinutePointer(2*Math.PI*hours/12,30,g);//画时针
drawHourAndMinutePointer(2*Math.PI*minutes/60,40,g);//画分针
drawSecondPointer(2*Math.PI*seconds/12,50,g);//画秒针
drawNumber(g);
g.drawOval(0, 50, 150, 150);//画左边圆
}
void drawSecondPointer(double angle, int radius, Graphics g) {
angle -= 0.5*Math.PI;//减去90度，因坐标与时钟差90度
int x = (int)(radius*Math.cos(angle));//计算针头的X坐标
int y = (int)(radius*Math.sin(angle));//计算针头的Y坐标
g.drawLine(75, 200, 75+x, 200+y);//画秒针
}
void drawHourAndMinutePointer(double angle, int radius, Graphics g) {
angle -= 0.5*Math.PI;//减去90度，因坐标与时钟差90度
int x = (int)(radius*Math.cos(angle));//计算针头的X坐标
int y = (int)(radius*Math.sin(angle));//计算针头的Y坐标
angle += 2*Math.PI/3;//将angle调整为第一针尾的角度
int x2 = (int)(5*Math.cos(angle));//计算第一针尾点的X坐标
int y2 = (int)(5*Math.sin(angle));//计算第一针尾点的Y坐标
angle += 2*Math.PI/3;//将angle调整为第二针尾的角度
int x3 = (int)(5*Math.cos(angle));//计算第二针尾点的X坐标
int y3 = (int)(5*Math.sin(angle));//计算第二针尾点的Y坐标
g.drawLine(75+x2, 200+y2, 75+x, 200+y);//画左翼
g.drawLine(75+x3, 200+y3, 75+x, 200+y);//画右翼
g.drawLine(75+x2, 200+y2, 75+x3, 200+y3);//画针尾
}
void drawNumber(Graphics g) {
for(int i = 1; i <= 12; i++) {
drawnumber(g,(float) (Math.PI / 6)*i,i);
}
}
void drawnumber(Graphics g,double angle,int num) {
float sine = (float) Math.sin(angle);
float cosine = (float) Math.cos(angle);
int x = (int) (40 * sine);
int y = (int) (40 * cosine);
g.drawString("" + num, x + 75, 200 - y);
}
public void run() {
currentTime = Calendar.getInstance();
hours = currentTime.get(Calendar.HOUR);
minutes = currentTime.get(Calendar.MINUTE);
seconds = currentTime.get(Calendar.SECOND);
repaint();
}
}
