java-swing類比實現時鐘效果

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  1 import java.awt.Color;  2 import java.awt.Font;  3 import java.awt.Graphics;  4 import java.util.Calendar;  5 import java.util.GregorianCalendar;  6   7 import javax.swing.JFrame;  8 import javax.swing.JPanel;  9  10 /** 11  *  12  * @author YYCat 13  * 14  */ 15 public class TestImitateClock extends JPanel{ 16  17     private static final long serialVersionUID = 1L; 18  19     public static final int DEFAULT_HEIGHT = 350;                        //面板的高度 20     public static final int DEFAULT_WIDTH = 300;                        //面板的寬度 21     public static final int DEFAULT_X = 100;                            //面板初始位置 22     public static final int DEFAULT_Y = 50; 23     public static final int PADDING_X = 30;                                 24     public static final int PADDING_Y = 60; 25     public static final int clockRadius = (DEFAULT_WIDTH-60)/2;            //定義時鐘圓的半徑radius 26     int xCenter = PADDING_X + clockRadius;                                 //時鐘圓的圓心座標 27     int yCenter = PADDING_Y + clockRadius; 28      29     /** 30      * 定義時間變數,便於計算對應的時、分、秒針對應的位置 31      */ 32     private int second, minute, hour;                                     33      34     public TestImitateClock(){ 35         initTime(); 36     } 37      38      39      40     public void paint(Graphics g){ 41         /** 42          * 畫時鐘輪廓 43          * 定義半徑clockRadius:120px; 44          */ 45          46 //        int clockRadius = DEFAULT_WIDTH - 60;        //半徑為 (300-600)/2 47         g.drawOval(PADDING_X, PADDING_Y, clockRadius*2, clockRadius*2); 48          49         paintClockNum(g); 50      51         paintClockHands(g); 52          53          54     } 55      56     /** 57      * 畫時鐘數字 58      * @param g 59      */ 60     public void paintClockNum(Graphics g){ 61          62         int strLength = xCenter - PADDING_X; 63         Font afterFont = new Font("宋體", Font.BOLD, 14); 64         Font beforeF = g.getFont(); 65          66         for(int i=0; i<12; i++){ 67             if(i%3==0){            //固定位置數字加粗顯示 68                 g.setFont(afterFont); 69             } 70             g.drawString(i*1 + "", (int) (xCenter + strLength*Math.sin(2*Math.PI/12*i)), (int) (yCenter + strLength*Math.cos(Math.PI + 2*Math.PI/12*i))); 71             g.setFont(beforeF); 72         } 73  74     } 75      76     /** 77      * 畫時針、分針、秒針 78      */ 79     public void paintClockHands(Graphics g){ 80          81         /** 82          * 設定時分秒針的長度、顏色、寬度 83          */ 84         double secondLen = clockRadius * 0.85; 85         double minuteLen = clockRadius * 0.75; 86         double hourLen = clockRadius * 0.65; 87          88         Color colorBefore = g.getColor(); 89          90          91         //秒針 92         g.setColor(Color.RED); 93         g.drawLine(xCenter, yCenter, (int)(xCenter + secondLen*Math.sin(2*Math.PI/60*second)),(int)( yCenter + secondLen*Math.cos(Math.PI+2*Math.PI/60*second))); 94          95         //分針 96         g.setColor(Color.CYAN); 97         g.drawLine(xCenter, yCenter, (int)(xCenter + minuteLen*Math.sin(2*Math.PI/60*minute)),(int)( yCenter + minuteLen*Math.cos(Math.PI+2*Math.PI/60*minute))); 98          99         //時針100         g.setColor(Color.DARK_GRAY);101         g.drawLine(xCenter, yCenter, (int)(xCenter + hourLen*Math.sin(2*Math.PI/12*hour)),(int)( yCenter + hourLen*Math.cos(Math.PI+2*Math.PI/12*hour)));102         103         g.setColor(colorBefore);104     }105     /**106      * 擷取時間107      */108     public void initTime(){109         Calendar calendar = new GregorianCalendar();110         second = calendar.get(Calendar.SECOND);111         minute = calendar.get(Calendar.MINUTE);112         hour = calendar.get(Calendar.HOUR_OF_DAY);            //24小時制113         114     }115     public static void main(String[] args){116         117         final JFrame frame = new JFrame();118         frame.setTitle("Clock");119         frame.setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);120         frame.setLocation(DEFAULT_X, DEFAULT_Y);121         frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);122         frame.setVisible(true);123         124         Thread thread = new Thread(){125             public void run(){126                 while(true){127                     TestImitateClock clock = new TestImitateClock();128                     frame.add(clock);129                     clock.setVisible(true);130                     frame.validate();        //接下來會每隔一秒重繪一次時鐘——即(從frame中將clock組件刪除),因此調用validate方法,使容器重新布置其子組件131                     try {132                         Thread.sleep(1000);133                     } catch (InterruptedException e) {134                         // TODO Auto-generated catch block135                         e.printStackTrace();136                     }137                     clock.setVisible(false);138                     frame.remove(clock);     //在父容器中將其刪除139                     clock.invalidate();        //使容器失效140                 }141             }142         };143         144         thread.start();145     }146 147 }

 

運行效果:

使用到frame.add(panel)      //向容器中添加面板組件

   frame.validate()      //使容器再次布置其子組件,在修改此容器的子組件時使用

   Thread thread = new Thread(){...}  //線程的使用,這裡並沒有使用太高深的東西

   Math.sin() //函數見API

java-swing類比實現時鐘效果

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