【文件属性】:
文件名称:模拟时钟StillClock类
文件大小:3KB
文件格式:JAVA
更新时间:2015-12-02 04:24:08
StillClock StillClock() StillClock类 模拟时钟 Still
Java基础篇中的StillClock类用于画出时钟以方便Java进阶篇P228第二十九章多线程(第八版)ClockWithAudio类的调用。
package 多线程练习;
import java.awt.*;
import javax.swing.*;
import java.util.*;
public class StillClock extends JPanel {
private int hour;
private int minute;
private int second;
/** Construct a default clock with the current time */
public StillClock() {
setCurrentTime();
}
/** Construct a clock with specified hour, minute, and second */
public StillClock(int hour, int minute, int second) {
this.hour = hour;
this.minute = minute;
this.second = second;
}
/** Return hour */
public int getHour() {
return hour;
}
/** Set a new hour */
public void setHour(int hour) {
this.hour = hour;
repaint();
}
/** Return minute */
public int getMinute() {
return minute;
}
/** Set a new minute */
public void setMinute(int minute) {
this.minute = minute;
repaint();
}
/** Return second */
public int getSecond() {
return second;
}
/** Set a new second */
public void setSecond(int second) {
this.second = second;
repaint();
}
/** Draw the clock */
protected void paintComponent(Graphics g) {
super.paintComponent(g);
// Initialize clock parameters
int clockRadius = (int) (Math.min(getWidth(), getHeight()) * 0.8 * 0.5);
int xCenter = getWidth() / 2;
int yCenter = getHeight() / 2;
// Draw circle
g.setColor(Color.black);
g.drawOval(xCenter - clockRadius, yCenter - clockRadius,
2 * clockRadius, 2 * clockRadius);
g.drawString("12", xCenter - 5, yCenter - clockRadius + 12);
g.drawString("9", xCenter - clockRadius + 3, yCenter + 5);
g.drawString("3", xCenter + clockRadius - 10, yCenter + 3);
g.drawString("6", xCenter - 3, yCenter + clockRadius - 3);
// Draw second hand
int sLength = (int) (clockRadius * 0.8);
int xSecond = (int) (xCenter + sLength
* Math.sin(second * (2 * Math.PI / 60)));
int ySecond = (int) (yCenter - sLength
* Math.cos(second * (2 * Math.PI / 60)));
g.setColor(Color.red);
g.drawLine(xCenter, yCenter, xSecond, ySecond);
// Draw minute hand
int mLength = (int) (clockRadius * 0.65);
int xMinute = (int) (xCenter + mLength
* Math.sin(minute * (2 * Math.PI / 60)));
int yMinute = (int) (yCenter - mLength
* Math.cos(minute * (2 * Math.PI / 60)));
g.setColor(Color.blue);
g.drawLine(xCenter, yCenter, xMinute, yMinute);
// Draw hour hand
int hLength = (int) (clockRadius * 0.5);
int xHour = (int) (xCenter + hLength
* Math.sin((hour % 12 + minute / 60.0) * (2 * Math.PI / 12)));
int yHour = (int) (yCenter - hLength
* Math.cos((hour % 12 + minute / 60.0) * (2 * Math.PI / 12)));
g.setColor(Color.BLACK);
g.drawLine(xCenter, yCenter, xHour, yHour);
}
public void setCurrentTime() {
// Construct a calendar for the current date and time
Calendar calendar = new GregorianCalendar();
// Set current hour, minute and second
this.hour = calendar.get(Calendar.HOUR_OF_DAY);
this.minute = calendar.get(Calendar.MINUTE);
this.second = calendar.get(Calendar.SECOND);
}
public Dimension getPreferredSize() {
return new Dimension(200, 200);
}
}
网友评论
- 深入浅出,值得学习,
- 对我有很大帮助,谢谢