1) production points
1. Multithreading
2. Use of java. util. Random classes
(2) embedded Applet HTML page source code
<HTML>
<HEAD>
<TITLE> SnowPic </TITLE>
</HEAD>
<BODY>
<Applet code = "SnowPic. class" align = "baseline" width = "1024" height = "768">
<Param name = "graphic" value = "Bridge.jpg">
<Param name = "snows" value = "100">
<Param name = "snowSize" value = "4">
<Param name = "threadsleep" value = "40">
</Applet>
</BODY>
</HTML>
Note: The java class in the image above is called the SnowPic ghost, and the image name is "bridge.jpg" and the size is 1024*768.
Java source code
Import java. applet. Applet;
Import java. awt .*;
Import java. util. Random;
Public class SnowPic extends Applet implements Runnable
{
Thread mainThread;
Image offScreen, gAlc [];
Random rand;
Int stopFlag, snows, wind, threadSleep, and snowSize;
Int [] snowX, snowY;
Long stopTime = 0;
Dimension dim;
MediaTracker mt;
Public SnowPic (){}
Int getParameter (String s1, int s2)
{
String s = getParameter (s1 );
Return (s! = Null )? Integer. parseInt (s): s2;
}
Int getParameter (String s1, int s2, int max, int min)
{
String s = getParameter (s1 );
If (s! = Null)
{
If (s2 = Integer. parseInt (s)> max) return max;
Else if (s2 <min) return min;
Else return s2;
} Else return s2;
}
String getParameter (String s1, String s2)
{
String s = getParameter (s1 );
Return (s! = Null )? S: s2;
}
Public void init ()
{
Rand = new Random ();
Dim = getSize ();
OffScreen = createImage (dim. width, dim. height );
Snows = getParameter ("snows", 100,500, 0 );
SnowSize = getParameter ("snowSize", 3,10, 3 );
ThreadSleep = getParameter ("threadSleep", 80 ,1000, 10 );
SnowX = new int [snows];
SnowY = new int [snows];
For (int I = 0; I <snows; I ++)
{
SnowX = rand. nextInt () % (dim. width/2) + dim. width/2;
SnowY = rand. nextInt () % (dim. height/2) + dim. height/2;
}
Mt = new MediaTracker (this );
GAlc = new Image [1];
GAlc [0] = getImage (getDocumentBase (), getParameter ("graphic", "test.gif "));
Mt. addImage (gAlc [0], 0 );
Try
{
Mt. waitForID (0 );
}
Catch (InterruptedException ex) {return ;}
StopFlag = 0;
}
Public void start ()
{
If (mainThread = null)
{
MainThread = new Thread (this );
MainThread. start ();
}
}
Public void stop ()
{
MainThread = null;
}
Public void run ()
{
While (mainThread! = Null)
{
Try
{
Thread. sleep (threadSleep );
}
Catch (InterruptedException ex) {return ;}
Repaint ();
}
}
Public void drawBackSnow (Graphics g)
{
G. setColor (Color. white );
For (int I = 0; I <snows; I ++)
{
G. fillOval (snowX, snowY, snowSize, snowSize );
SnowX + = rand. nextInt () % 2 + wind;
SnowY + = (rand. nextInt () % 6 + 5)/5 + 1;
If (snowX> = dim. width) snowX = 0;
If (snowX <0) snowX = dim. width-1;
If (snowY> = dim. height | snowY <0)
{
SnowX = Math. abs (rand. nextInt () % dim. width );
SnowY = 0;
}
}
Wind = rand. nextInt () % 5-2;
}
Public void paint (Graphics g)
{
OffScreen. getGraphics (). setColor (Color. black );
OffScreen. getGraphics (). fillRect (0, 0, dim. width, dim. height );
OffScreen. getGraphics (). drawImage (gAlc [0], 0, 0, this );
DrawBackSnow (offScreen. getGraphics ());
G. drawImage (offScreen, 0, 0, null );
}
Public void update (Graphics g)
{
Paint (g );
}
}
Save as SnowPic. java
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