java 线程和Applet
编写Applet程序，当鼠标单击小程序窗口区域的某一点，由该点的下方打上一光束，以单击点为中心向四周呈同心圆散开，其效果类似放烟花，尽可能使制作的烟花更逼真。
求教啊
[最优解释]
这个不会是作业吧，我会被骂的
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.image.BufferedImage;
import javax.swing.JApplet;
public class TApplet extends JApplet {
abstract class Action {
protected int clickX;
protected int clickY;
private boolean isFinish = false;
private Action nextAction;
public Action(int x, int y) {
clickX = x;
clickY = y;
}
public Action getNextAction() {
return nextAction;
}
public boolean isFinish() {
return isFinish;
}
public abstract void render(Graphics2D g);
protected void setFinish(boolean flag) {
isFinish = flag;
}
public void setNextAction(Action action) {
nextAction = action;
}
public abstract void update(long timeMillions);
}
class BeginAction extends Action {
private int beginX;
private int beginY;
private int currentX;
private int currentY;
public BeginAction(int x, int y) {
super(x, y);
beginX = currentX = x;
beginY = currentY = y + 300;
}
@Override
public void render(Graphics2D g) {
g.setColor(Color.red);
g.drawLine(beginX, beginY, currentX, currentY);
}
@Override
public void update(long timeMillions) {
if (!isFinish()) {
currentY -= 2;
if (currentY < clickY)
setFinish(true);
}
}
}
class DiffuseAction extends Action{
private int radius = 0;
public DiffuseAction(int x, int y) {
super(x, y);
}
@Override
public void render(Graphics2D g) {
g.setColor(Color.red);
g.drawRoundRect(clickX - radius / 2, clickY - radius / 2, radius, radius, radius, radius);
}
@Override
public void update(long timeMillions) {
radius += 2;
if(radius > 400)
setFinish(true);
}
}
private static final int HEIGHT = 600;
private static final int WIDTH = 600;
private Action currentAction;
private Thread currentThread;
private BufferedImage image;
@Override
public void init() {
super.init();
setSize(WIDTH, HEIGHT);
addMouseListener(new MouseAdapter() {
@Override
public void mouseClicked(MouseEvent e) {
final int x = e.getX();
final int y = e.getY();
if(currentThread != null)
currentThread.interrupt();
currentThread = new Thread() {
public void run() {
currentAction = new BeginAction(x, y);
currentAction.setNextAction(new DiffuseAction(x, y));
try {
while (true) {
Thread.sleep(30);
if(currentAction == null)
break;
if(!currentAction.isFinish())
currentAction
.update(System.currentTimeMillis());
else
currentAction = currentAction.getNextAction();
repaint();
}
} catch (InterruptedException e) {
}
}
};
currentThread.start();
}
});
}
public void paint(Graphics g){
super.paint(g);
if (currentAction != null)
currentAction.render((Graphics2D) g);
}
@Override
public void update(Graphics g) {
image = new BufferedImage(WIDTH, HEIGHT, BufferedImage.TYPE_INT_ARGB);
Graphics2D g2 = image.createGraphics();
paint(g2);
g.drawImage(image, 0, 0, null);
}
}
