关于如何实现一个时钟动画的问题? 我想实现一个时钟的动画,具体的思路如下:初始化是用系统的时间来初始化秒针、分针和时针。整个动画中,秒针每隔1秒转6度,分针每隔1分钟转6度,时针每隔1小时转30度。 现在我的问题是:如何在java中的得到系统的时间?如何利用这个时间来初始化分针、秒针和时针(就是怎样利用时间来得到分针、秒针、时针的开始角度) 谢谢各位指教!! 解决方案 » 免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货 用AWT的Graphics就可以实现。初始化时根据时间求出每个针所在的象限的坐标绘图即可。比如m分钟时,坐标为(r+r*sin(6*m),r-r*cos(6*m)) 我以前写的,供参考import java.awt.*;import java.awt.geom.Ellipse2D;import java.awt.geom.GeneralPath;import java.awt.geom.Line2D;import java.awt.geom.Rectangle2D;import java.util.Calendar;import java.util.Date;import javax.swing.BorderFactory;import javax.swing.JComponent;import javax.swing.JFrame;import javax.swing.UIManager;public class Clock extends JComponent{ private static final Color INTEGRAL_COLOR = new Color(0, 128, 128); private int radius; private Calendar currentTime = Calendar.getInstance(); private double s = 0.03; public Clock(int radius) { this.radius = radius; } public void setCurrentTime(Date time) { this.currentTime.setTime(time); } public void setCurrentTime(long millis) { this.currentTime.setTimeInMillis(millis); } public Dimension getPreferredSize() { Insets insets = getInsets(); int r = (int) (radius == -1 ? 0 : radius*(1+s))+1; return new Dimension(r * 2 + insets.left + insets.right, r * 2 + insets.top + insets.bottom); } protected void paintComponent(Graphics g) { super.paintComponent(g); Graphics2D g2d = (Graphics2D) g; g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); Insets insets = getInsets(); int wid = getWidth() - insets.left - insets.right; int hei = getHeight() - insets.top - insets.bottom; int r = (int) ((Math.min(wid, hei)) / 2 / (1+s)); g2d.translate(insets.left + r * (1+s), insets.top + r * (1+s)); g2d.scale(1, -1); for (int i = 0; i < 60; i++) { int angle = 90 - i * 6; double pos[] = calcPos(r, angle); paintMinuteDot(r, g2d, pos[0], pos[1], i % 5 == 0); } paintHourPointer(r, g2d); paintMinutePointer(r, g2d); paintSecondPointer(r, g2d); paintCenterPoint(g2d); g2d.scale(1, -1); g2d.translate(-insets.left - r * (1+s), -insets.top - r * (1+s)); } private void paintCenterPoint(Graphics2D g2d) { g2d.setColor(Color.BLUE); Rectangle2D rect = new Rectangle2D.Double(-2, -2, 4, 4); g2d.fill(rect); } private void paintMinutePointer(int r, Graphics2D g2d) { int minute = currentTime.get(Calendar.MINUTE); int second = currentTime.get(Calendar.SECOND); double angle = 90 - (minute + second / 60.0) * 6; Shape pointerShape = createPointerShape(r * 0.8, r * 0.04, r * 0.08, angle); g2d.setColor(Color.LIGHT_GRAY); g2d.fill(pointerShape); g2d.setColor(Color.DARK_GRAY); g2d.draw(pointerShape); } private void paintHourPointer(int r, Graphics2D g2d) { int hour = currentTime.get(Calendar.HOUR); int minute = currentTime.get(Calendar.MINUTE); int second = currentTime.get(Calendar.SECOND); double angle = 90 - (hour + minute / 60.0 + second / 3600.0) * 30; Shape pointerShape = createPointerShape(r * 0.6, r * 0.06, r * 0.1, angle); g2d.setColor(Color.LIGHT_GRAY); g2d.fill(pointerShape); g2d.setColor(Color.DARK_GRAY); g2d.draw(pointerShape); } private Shape createPointerShape(double r1, double r2, double r3, double angle) { GeneralPath gp = new GeneralPath(); double[] pos = calcPos(r1, angle); double[] pos1 = calcPos(r2, angle + 90); gp.append(new Line2D.Double(pos[0], pos[1], pos1[0], pos1[1]), true); double[] pos2 = calcPos(r3, angle + 180); gp.lineTo((float)pos2[0], (float)pos2[1]); double[] pos3 = calcPos(r2, angle + 270); gp.lineTo((float)pos3[0], (float)pos3[1]); gp.closePath(); return gp; } private void paintSecondPointer(int r, Graphics2D g2d) { g2d.setColor(Color.BLACK); int second = currentTime.get(Calendar.SECOND); int angle = 90 - second * 6; double pos[] = calcPos(r * 0.9, angle); double pos1[] = calcPos(r * 0.2, angle + 180); Line2D line = new Line2D.Double(pos1[0], pos1[1], pos[0], pos[1]); g2d.draw(line); } private void paintMinuteDot(int r, Graphics2D g2d, double x, double y, boolean flag) { g2d.setColor(flag ? Color.RED : Color.BLACK); if (flag) {// Rectangle2D rect = new Rectangle2D.Double( Ellipse2D rect = new Ellipse2D.Double( x - r * s, y - r * s, r * s * 2, r * s * 2); g2d.fill(rect); } else { //Rectangle2D rect = new Rectangle2D.Double( Ellipse2D rect = new Ellipse2D.Double( x - r * 0.02, y - r * 0.02, r * 0.04, r * 0.04); g2d.fill(rect); } } private double[] calcPos(double r, double angle) { double radian = Math.toRadians(angle); double x = r * Math.cos(radian); double y = r * Math.sin(radian); return new double[] {x, y}; } public static void main(String[] args) { try { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); } catch (Exception e) { e.printStackTrace(); } final Clock clock = new Clock(50); clock.setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 10)); JFrame f = new JFrame("Clock"); f.getContentPane().add(clock, BorderLayout.CENTER); f.pack(); f.setLocationRelativeTo(null); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); f.setVisible(true); new Thread() { public void run() { while (true) { try { Thread.sleep(1000); } catch (InterruptedException ex) { ex.printStackTrace(); } clock.setCurrentTime(System.currentTimeMillis()); clock.repaint(); } } }.start(); }} Java7无法使用java.dyn包 关于 建包的问题 求java写的哈弗曼编码译码系统 急用... 请问JAVA水平问题~ 一个小问题:a = b = c 求教JTextPane的两个问题! 关于jacob读写word的问题? 想把jbuilder7 enterprise trial在linux里安装。 《java专业编程指南》这本书好吗? 我用java作了一个类 在JAVA中 ABCD的自由组合排列有几种,并打印出来 sybase数据库外连接语句怎么写?
比如m分钟时,坐标为(r+r*sin(6*m),r-r*cos(6*m))
import java.awt.geom.Ellipse2D;
import java.awt.geom.GeneralPath;
import java.awt.geom.Line2D;
import java.awt.geom.Rectangle2D;
import java.util.Calendar;
import java.util.Date;import javax.swing.BorderFactory;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.UIManager;public class Clock extends JComponent
{
private static final Color INTEGRAL_COLOR = new Color(0, 128, 128); private int radius;
private Calendar currentTime = Calendar.getInstance(); private double s = 0.03; public Clock(int radius)
{
this.radius = radius;
}
public void setCurrentTime(Date time)
{
this.currentTime.setTime(time);
}
public void setCurrentTime(long millis)
{
this.currentTime.setTimeInMillis(millis);
}
public Dimension getPreferredSize()
{
Insets insets = getInsets();
int r = (int) (radius == -1 ? 0 : radius*(1+s))+1;
return new Dimension(r * 2 + insets.left + insets.right,
r * 2 + insets.top + insets.bottom);
}
protected void paintComponent(Graphics g)
{
super.paintComponent(g); Graphics2D g2d = (Graphics2D) g;
g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
Insets insets = getInsets();
int wid = getWidth() - insets.left - insets.right;
int hei = getHeight() - insets.top - insets.bottom;
int r = (int) ((Math.min(wid, hei)) / 2 / (1+s)); g2d.translate(insets.left + r * (1+s), insets.top + r * (1+s));
g2d.scale(1, -1);
for (int i = 0; i < 60; i++) {
int angle = 90 - i * 6;
double pos[] = calcPos(r, angle);
paintMinuteDot(r, g2d, pos[0], pos[1], i % 5 == 0);
} paintHourPointer(r, g2d);
paintMinutePointer(r, g2d);
paintSecondPointer(r, g2d);
paintCenterPoint(g2d);
g2d.scale(1, -1);
g2d.translate(-insets.left - r * (1+s), -insets.top - r * (1+s));
}
private void paintCenterPoint(Graphics2D g2d)
{
g2d.setColor(Color.BLUE);
Rectangle2D rect = new Rectangle2D.Double(-2, -2, 4, 4);
g2d.fill(rect);
} private void paintMinutePointer(int r, Graphics2D g2d)
{
int minute = currentTime.get(Calendar.MINUTE);
int second = currentTime.get(Calendar.SECOND);
double angle = 90 - (minute + second / 60.0) * 6;
Shape pointerShape = createPointerShape(r * 0.8, r * 0.04, r * 0.08, angle); g2d.setColor(Color.LIGHT_GRAY);
g2d.fill(pointerShape); g2d.setColor(Color.DARK_GRAY);
g2d.draw(pointerShape);
} private void paintHourPointer(int r, Graphics2D g2d)
{
int hour = currentTime.get(Calendar.HOUR);
int minute = currentTime.get(Calendar.MINUTE);
int second = currentTime.get(Calendar.SECOND);
double angle = 90 - (hour + minute / 60.0 + second / 3600.0) * 30;
Shape pointerShape = createPointerShape(r * 0.6, r * 0.06, r * 0.1, angle); g2d.setColor(Color.LIGHT_GRAY);
g2d.fill(pointerShape); g2d.setColor(Color.DARK_GRAY);
g2d.draw(pointerShape);
} private Shape createPointerShape(double r1, double r2, double r3, double angle)
{
GeneralPath gp = new GeneralPath();
double[] pos = calcPos(r1, angle);
double[] pos1 = calcPos(r2, angle + 90);
gp.append(new Line2D.Double(pos[0], pos[1], pos1[0], pos1[1]), true);
double[] pos2 = calcPos(r3, angle + 180);
gp.lineTo((float)pos2[0], (float)pos2[1]);
double[] pos3 = calcPos(r2, angle + 270);
gp.lineTo((float)pos3[0], (float)pos3[1]); gp.closePath(); return gp;
} private void paintSecondPointer(int r, Graphics2D g2d)
{
g2d.setColor(Color.BLACK);
int second = currentTime.get(Calendar.SECOND);
int angle = 90 - second * 6;
double pos[] = calcPos(r * 0.9, angle);
double pos1[] = calcPos(r * 0.2, angle + 180); Line2D line = new Line2D.Double(pos1[0], pos1[1], pos[0], pos[1]);
g2d.draw(line);
} private void paintMinuteDot(int r, Graphics2D g2d, double x, double y, boolean flag)
{
g2d.setColor(flag ? Color.RED : Color.BLACK);
if (flag) {
// Rectangle2D rect = new Rectangle2D.Double(
Ellipse2D rect = new Ellipse2D.Double(
x - r * s, y - r * s, r * s * 2, r * s * 2);
g2d.fill(rect);
}
else {
//Rectangle2D rect = new Rectangle2D.Double(
Ellipse2D rect = new Ellipse2D.Double(
x - r * 0.02, y - r * 0.02, r * 0.04, r * 0.04);
g2d.fill(rect);
}
} private double[] calcPos(double r, double angle)
{
double radian = Math.toRadians(angle);
double x = r * Math.cos(radian);
double y = r * Math.sin(radian); return new double[] {x, y};
} public static void main(String[] args)
{
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (Exception e) {
e.printStackTrace();
} final Clock clock = new Clock(50);
clock.setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 10));
JFrame f = new JFrame("Clock");
f.getContentPane().add(clock, BorderLayout.CENTER);
f.pack();
f.setLocationRelativeTo(null);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setVisible(true);
new Thread() {
public void run()
{
while (true) {
try {
Thread.sleep(1000);
} catch (InterruptedException ex) {
ex.printStackTrace();
}
clock.setCurrentTime(System.currentTimeMillis());
clock.repaint();
}
}
}.start();
}
}