| 发表于：2007-01-09 13:46:01 楼主 |
由于有些类还没学好，所以对程序的绘图不怎么明白，可以帮忙讲解下或者加点注释吗？谢谢了！
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) //设置当前时间
{
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); //返回一个指定宽、高的dimension
}
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（ "软件4班 3104007114 彭洪钰 ");
//f.setbounds（380,200,500,600);
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（);
}
}
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