// Clock2.java
import java.util.*;
import java.awt.*;
import java.applet.*;
public class Clock2 extends Applet implements Runnable
{
Thread timer = null;
int lastxs = 0, lastys = 0, lastxm = 0, lastym = 0, lastxh = 0,
lastyh = 0;
Date dummy = new Date();
String lastdate = dummy.toLocaleString();
// 初始化小程序
public void init()
{
int x, y;
// 设置时钟窗口的大小
resize(300, 300);
}
// 制作时钟界面
public void plotpoints(int x0, int y0, int x, int y, Graphics g)
{
g.drawLine(x0 + x, y0 + y, x0 + x, y0 + y);
g.drawLine(x0 + y, y0 + x, x0 + y, y0 + x);
g.drawLine(x0 + y, y0 - x, x0 + y, y0 - x);
g.drawLine(x0 + x, y0 - y, x0 + x, y0 - y);
g.drawLine(x0 - x, y0 - y, x0 - x, y0 - y);
g.drawLine(x0 - y, y0 - x, x0 - y, y0 - x);
g.drawLine(x0 - y, y0 + x, x0 - y, y0 + x);
g.drawLine(x0 - x, y0 + y, x0 - x, y0 + y);
}
// 画表盘
public void circle(int x0, int y0, int r, Graphics g)
{
int x, y;
float d;
x = 0;
y = r;
d = 5 / 4 - r;
plotpoints(x0, y0, x, y, g);
while(y > x)
{
if(d < 0)
{
d = d + 2 * x + 3;
x++;
}
else
{
d = d + 2 * ( x - y ) + 5;
x++;
y--;
}
plotpoints(x0, y0, x, y, g);
}
}
// 画屏函数
@SuppressWarnings("deprecation")
public void paint(Graphics g)
{
int xh, yh, xm, ym, xs, ys, s, m, h, xcenter, ycenter;
int mlong = 30; //调整这个值的大小，可以调解钟表的大小！
String today;
Date dat = new Date();
s = dat.getSeconds();
m = dat.getMinutes();
h = dat.getHours();
today = dat.toLocaleString();
xcenter = 110;
ycenter = 65;
xs = ( int ) ( Math.cos(s * 3.14f / 30 - 3.14f / 2) * (mlong+5) + xcenter );
ys = ( int ) ( Math.sin(s * 3.14f / 30 - 3.14f / 2) *(mlong+5) + ycenter );
xm = ( int ) ( Math.cos(m * 3.14f / 30 - 3.14f / 2) * mlong + xcenter );
ym = ( int ) ( Math.sin(m * 3.14f / 30 - 3.14f / 2) * mlong + ycenter );
xh = ( int ) ( Math.cos( ( h * 30 + m / 2 ) * 3.14f / 180 - 3.14f / 2) * (mlong-10) + xcenter );
yh = ( int ) ( Math.sin( ( h * 30 + m / 2 ) * 3.14f / 180 - 3.14f / 2) * (mlong-10) + ycenter );
// 画表盘
g.setFont(new Font("TimesRoman", Font.PLAIN, 14));
g.setColor(Color.blue);
circle(xcenter, ycenter, (mlong+10), g);
g.setColor(Color.darkGray);
g.drawString("9", xcenter - (mlong+5), ycenter + 3);
g.drawString("3", xcenter + mlong, ycenter + 3);
g.drawString("12", xcenter-6 , ycenter - (mlong-3));
g.drawString("6", xcenter-2, ycenter + (mlong+5));
// 重画
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);
}
g.setColor(Color.darkGray);
g.drawString(today, 5, 125);
g.drawLine(xcenter, ycenter, xs, ys);
g.setColor(Color.blue);
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;
}
public void start()
{
if(timer == null)
{
timer = new Thread(this);
timer.start();
}
}
public void stop()
{
timer = null;
}
public void run()
{
while(timer != null)
{
try
{
Thread.sleep(100);
}
catch(InterruptedException e)
{
}
repaint();
}
timer = null;
}
public void update(Graphics g)
{
paint(g);
}
}
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