clock.java

java GUI使用实现的日历

package MyCalender;

import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.event.*;
import javax.swing.*;
import javax.swing.Timer;

public class Clock extends JFrame implements ActionListener {
	Timer timer;

	int x, y, old_X, old_Y, r, x0, y0, w, h, ang;

	int sdo, mdo, hdo, old_M, old_H;

	final double RAD = Math.PI / 180.0;

	// --------------------------------------------------------------------------------------------
	public static void main(String[] args) {
		Clock cl = new Clock();
	}

	// --------------------------------------------------------------------------------------------
	/* 实现ActionListener接口里面的方法 */
	public void actionPerformed(ActionEvent e) {
		timer.restart();
	}

	// --------------------------------------------------------------------------------------------
	/**
	 * 方法说明：构造器，显示窗体，并添加了一个秒表
	 */
	public Clock() {
		super("Clock");/* 用窗体标题构造 */
		getContentPane().setLayout(null);
		setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
		setBackground(new Color(0, 0, 192)); /* 设置背景颜色 */
		setSize(418, 394); /* 钟表窗口的大小 */
		show(); /* 显示窗口 */
		int delay = 1000;
		// 窗体添加事件监听，监听秒表的触发
		ActionListener taskPerformer = new ActionListener() {
			public void actionPerformed(ActionEvent evt) {
				repaint();
			}// Timer将要触发的任务
		};
		new Timer(delay, taskPerformer).start();/* 启动Timer记时器 */
	}

	/***************************************************************************
	 * 方法说明：绘制图形 <br>
	 * 输入参数：Graphics g <br>
	 * 返回类型：void <br>
	 * 重写系统的paint()方法
	 **************************************************************************/
	public void paint(Graphics g) {
		this.setBackground(Color.BLUE);
		Insets insets = getInsets();
		System.out.println("insets left"+insets.left);
		System.out.println("insets top"+insets.top);
		int L0 = (insets.left) / 2, T0 = (insets.top) / 2;
//		int L0 = 15, T0 = 2;
		int hh, mm, ss;
		String st;
		h = getSize().height;
		// 绘制圆形
		g.setColor(Color.white);
		g.drawOval(L0 + 30, T0 + 30, h - 60, h - 60);
		g.drawOval(L0 + 32, T0 + 32, h - 64, h - 64);
		r = h / 2 - 30;
		x0 = 30 + r - 5 + L0;
		y0 = 30 + r - 5 - T0;
		ang = 60;
		for (int i = 1; i <= 12; i++) {
			x = (int) ((r + 10) * Math.cos(RAD * ang) + x0);
			y = (int) ((r + 10) * Math.sin(RAD * ang) + y0);
			g.drawString("" + i, x, h - y);
			ang -= 30;
		}
		x0 = 30 + r + L0;
		y0 = 30 + r + T0;
		// 获取时间
		Calendar now = Calendar.getInstance();
		hh = now.get(Calendar.HOUR_OF_DAY);// 小时
		mm = now.get(Calendar.MINUTE);// 分钟
		ss = now.get(Calendar.SECOND);// 秒
		g.setColor(Color.pink);
		g.fillRect(L0, T0, 60, 28);// 填充的矩形
		g.setColor(Color.blue);
		if (hh < 10)
			st = "0" + hh;
		else
			st = "" + hh;
		if (mm < 10)
			st = st + ":0" + mm;
		else
			st = st + ":" + mm;
		if (ss < 10)
			st = st + ":0" + ss;
		else
			st = st + ":" + ss;
		g.drawString(st, L0, T0 + 25);
		// 计算时间和图形的关系
		sdo = 90 - ss * 6;
		mdo = 90 - mm * 6;
		hdo = 90 - hh * 30 - mm / 2;
		// 擦除秒针
		if (old_X > 0) {
			g.setColor(getBackground());
			g.drawLine(x0, y0, old_X, (h - old_Y));
		} else {
			old_M = mdo;
			old_H = hdo;
		}
		// 绘制秒针
		g.setColor(Color.yellow);
		x = (int) ((r - 8) * Math.cos(RAD * sdo) + x0);
		y = (int) ((r - 8) * Math.sin(RAD * sdo) + y0) - 2 * T0;
		g.drawLine(x0, y0, x, (h - y));

		old_X = x;
		old_Y = y;
		// 擦除分针和时针
		if (mdo != old_M) {
			line(g, old_M, (int) (r * 0.7), getBackground());
			old_M = mdo;
		}
		if (hdo != old_H) {
			line(g, old_H, (int) (r * 0.5), getBackground());
			old_H = hdo;
		}
		// 绘制分针
		line(g, mdo, (int) (r * 0.7), Color.green);
		// 绘制时针
		line(g, hdo, (int) (r * 0.5), Color.red);
	} // end paint

	/**
	 * 方法说明：绘制线，用于绘制时针和分针 输入参数： 返回类型：
	 */
	// --------------------------------------------------------------------------------------------
	public void line(Graphics g, int t, int n, Color c) {
		int[] xp = new int[4];
		int[] yp = new int[4];
		xp[0] = x0;
		yp[0] = y0;
		xp[1] = (int) ((n - 10) * Math.cos(RAD * (t - 4)) + x0);
		yp[1] = h - (int) ((n - 10) * Math.sin(RAD * (t - 4)) + y0);
		xp[2] = (int) (n * Math.cos(RAD * t) + x0);
		yp[2] = h - (int) (n * Math.sin(RAD * t) + y0);
		xp[3] = (int) ((n - 10) * Math.cos(RAD * (t + 4)) + x0);
		yp[3] = h - (int) ((n - 10) * Math.sin(RAD * (t + 4)) + y0);
		g.setColor(c);
		g.fillPolygon(xp, yp, 4);
	}
}