[求救.帮帮忙.]如何用多线程播放烟花?

[ten1e]

要求: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.
1.多线程
2.光束和同心圆分开处理


麻烦各位帮帮硪..谢谢大家了..

[ten1e]

帮帮硪了..十万火急啊..麻烦各位高手了..

[a_nuo]

顶了！

[Inhibitory]

典型的粒子系统问题，主要的是双缓冲实现动画。粒子系统的程序都是比较大的。最好还要用到透明效果。

[吴恒]

给楼主一个例子， 和楼主要求差不多
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import java.util.*;
import javax.swing.*;

/**
Shows an animated bouncing ball.
*/
public class BounceThread
{
public static void main(String[] args)
{
JFrame frame = new BounceFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
}

/**
A runnable that animates a bouncing ball.
*/
class BallRunnable implements Runnable
{
/**
Constructs the runnable.
@aBall the ball to bounce
@aPanel the component in which the ball bounces
*/
public BallRunnable(Ball aBall, Component aComponent)
{
ball = aBall;
component = aComponent;
}

public void run()
{
try
{
for (int i = 1; i <= STEPS; i++)
{
ball.move(component.getBounds());
component.repaint();
Thread.sleep(DELAY);
}
}
catch (InterruptedException e)
{
}
}

private Ball ball;
private Component component;
public static final int STEPS = 1000;
public static final int DELAY = 5;
}

/**
A ball that moves and bounces off the edges of a
rectangle
*/
class Ball
{
/**
Moves the ball to the next position, reversing direction
if it hits one of the edges
*/
public void move(Rectangle2D bounds)
{
x += dx;
y += dy;
if (x < bounds.getMinX())
{
x = bounds.getMinX();
dx = -dx;
}
if (x + XSIZE >= bounds.getMaxX())
{
x = bounds.getMaxX() - XSIZE;
dx = -dx;
}
if (y < bounds.getMinY())
{
y = bounds.getMinY();
dy = -dy;
}
if (y + YSIZE >= bounds.getMaxY())
{
y = bounds.getMaxY() - YSIZE;
dy = -dy;
}
}

/**
Gets the shape of the ball at its current position.
*/
public Ellipse2D getShape()
{
return new Ellipse2D.Double(x, y, XSIZE, YSIZE);
}

private static final int XSIZE = 15;
private static final int YSIZE = 15;
private double x = 0;
private double y = 0;
private double dx = 1;
private double dy = 1;
}

/**
The panel that draws the balls.
*/
class BallPanel extends JPanel
{
/**
Add a ball to the panel.
@param b the ball to add
*/
public void add(Ball b)
{
balls.add(b);
}

public void paintComponent(Graphics g)
{
super.paintComponent(g);
Graphics2D g2 = (Graphics2D) g;
for (Ball b : balls)
{
g2.fill(b.getShape());
}
}

private ArrayList<Ball> balls = new ArrayList<Ball>();
}

/**
The frame with panel and buttons.
*/
class BounceFrame extends JFrame
{
/**
Constructs the frame with the panel for showing the
bouncing ball and Start and Close buttons
*/
public BounceFrame()
{
setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
setTitle("BounceThread");

panel = new BallPanel();
add(panel, BorderLayout.CENTER);
JPanel buttonPanel = new JPanel();
addButton(buttonPanel, "Start",
new ActionListener()
{
public void actionPerformed(ActionEvent event)
{
addBall();
}
});

addButton(buttonPanel, "Close",
new ActionListener()
{
public void actionPerformed(ActionEvent event)
{
System.exit(0);
}
});
add(buttonPanel, BorderLayout.SOUTH);
}

/**
Adds a button to a container.
@param c the container
@param title the button title
@param listener the action listener for the button
*/
public void addButton(Container c, String title, ActionListener listener)
{
JButton button = new JButton(title);
c.add(button);
button.addActionListener(listener);
}

/**
Adds a bouncing ball to the canvas and starts a thread
to make it bounce
*/
public void addBall()
{
Ball b = new Ball();
panel.add(b);
Runnable r = new BallRunnable(b, panel);
Thread t = new Thread(r);
t.start();
}

private BallPanel panel;
public static final int DEFAULT_WIDTH = 450;
public static final int DEFAULT_HEIGHT = 350;
public static final int STEPS = 1000;
public static final int DELAY = 3;
}

[lixiaoxue85]

线程并发