package timer.com.cn;
import javax.swing.*; //時鐘
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.*;
import java.util.Calendar;
import java.util.GregorianCalendar;
class Clock extends JFrame implements ActionListener {
int x, y, x0, y0, r, h, olds_x, olds_y, oldm_x, oldm_y, oldh_x, oldh_y, ss,
mm, hh, old_m, old_h, ang;
final double RAD = Math.PI / 180; // 度數轉換成弧度的比例
// 構造函數創建了一個窗體
public Clock() {
super("時鐘"); // 設置標題
setSize(250, 250); // 設置窗口尺寸
setBackground(Color.WHITE); // 設置背景顏色
setLocation(300, 150); // 設置窗口位置座標
setResizable(false); // 使窗口可以最小化和關閉,但是不能任意改變大小
setVisible(true); // 設置組建可見
int delay = 100; // 設置延時
// 創建一個監聽事件
ActionListener drawClock = new ActionListener() {
public void actionPerformed(ActionEvent evt) {
repaint();
}
};
new Timer(delay, drawClock).start(); // 創建時間計數器,每秒觸發一次
}
public void actionPerformed(ActionEvent e) {// 實現ActionListener接口必須實現的方法}
} // 繪製圖形
public void paint(Graphics g) {
Graphics2D g2D = (Graphics2D) g;
Insets insets = getInsets();
int L = insets.left / 2, T = insets.top / 2;
h = getSize().height;
g.setColor(Color.black);
// 畫圓
g2D.setStroke(new BasicStroke(4.0f));
g.drawOval(L + 40, T + 40, h - 80, h - 80);
r = h / 2 - 40;
x0 = 40 + r - 5 + L;
y0 = 40 + r - 5 - T;
ang = 60;
// 繪製時鐘上的12個數字
for (int i = 1; i <= 12; i++) {
x = (int) ((r - 9) * Math.cos(RAD * ang) + x0);
y = (int) ((r - 9) * Math.sin(RAD * ang) + y0);
g.drawString("" + i, x, h - y);
ang -= 30;
}
// 獲得當前系統時間
Calendar now = new GregorianCalendar();
int nowh = now.get(Calendar.HOUR_OF_DAY);
int nowm = now.get(Calendar.MINUTE);
int nows = now.get(Calendar.SECOND);
String st;
if (nowh < 10)
st = "0" + nowh;
else
st = "" + nowh;
if (nowm < 10)
st += ":0" + nowm;
else
st += ":" + nowm;
if (nows < 10)
st += ":0" + nows;
else
st += ":" + nows;
// 在窗體上顯示時間
g.setColor(Color.white);//
g.fillRect(L, T, 50, 28);//
g.setColor(Color.black);//
g.drawString(st, L + 2, T + 26);//
// 計算時間與度數的關係
ss = 90 - nows * 6;
mm = 90 - nowm * 6;
hh = 90 - nowh * 30 - nowm / 2;
x0 = r + 40 + L;
y0 = r + 40 + T;
g2D.setStroke(new BasicStroke(1.0f));// 秒針粗細
// 擦除秒針
if (olds_x > 0) {
g.setColor(getBackground());
g.drawLine(x0, y0, olds_x, h - olds_y);
} else {
old_m = mm;
old_h = hh;
}
// 繪製秒針
x = (int) (r * 0.9 * Math.cos(RAD * ss)) + x0;// 長度
y = (int) (r * 0.9 * Math.sin(RAD * ss)) + y0 - 2 * T;
g.setColor(Color.black);// 指針顏色
g.drawLine(x0, y0, x, h - y);// 軌跡
olds_x = x;
olds_y = y;
g2D.setStroke(new BasicStroke(2.2f));// 分針粗細
// 擦除分針
if (old_m != mm) {
g.setColor(getBackground());
g.drawLine(x0, y0, oldm_x, h - oldm_y);
}
// 繪製分針
x = (int) (r * 0.7 * Math.cos(RAD * mm)) + x0;// 長度
y = (int) (r * 0.7 * Math.sin(RAD * mm)) + y0 - 2 * T;
g.setColor(Color.red);// 顏色
g.drawLine(x0, y0, x, h - y);
oldm_x = x;
oldm_y = y;
old_m = mm;
g2D.setStroke(new BasicStroke(3.4f));// 時針粗細
// 擦除時針
if (old_h != hh) {
g.setColor(getBackground());
g.drawLine(x0, y0, oldh_x, h - oldh_y);
}
// 繪製時針
x = (int) (r * 0.5 * Math.cos(RAD * hh)) + x0;// 長度
y = (int) (r * 0.5 * Math.sin(RAD * hh)) + y0 - 2 * T;
g.setColor(Color.red);// 顏色
g.drawLine(x0, y0, x, h - y);
oldh_x = x;
oldh_y = y;
old_h = hh;
}
public static void main(String[] args) {
Clock c = new Clock();
}
}