求火焰效果的Applet。

nethunterx 2004-05-02 01:38:11
如题。
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VVV_lucky 2004-05-02
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import java.awt.*;
import java.lang.*;

public class fire extends java.applet.Applet implements Runnable {
boolean first=true;
int ROWS = 50;
int COLS = 64;
int HIDDEN = 4;
int ROWS_SEED = 4;
int ROWS_RESEED = 48;
int MAX_SEED = 8;
int PALETTE_SIZE = 64;
int COOLING_LIMIT = 32;
int COOLING_ROWS = 42;
int COOLING_FACTOR = 2;
java.awt.Color palette[] = new java.awt.Color[PALETTE_SIZE];
byte Buffer[],Buffer2[];
String message,textfont;
int textsize,textX,textY;
Color textcolor;
Image offScrImage=null;
Graphics offScrGC;
Dimension offScrSize;

Thread kicker=null;

public String getAppletInfo() {
return "Fire applet by Javier Rodriguez <jrodrig@data.net.mx>";
}

public String[][] getParameterInfo() {
String[][] info = {
{"coolingrows", "int", "number of rows to cool"},
{"coolingfactor", "int", "cooling factor"},
{"coolinglimit", "int", "cooling threshold"},
{"soundtrack", "url", "background sound"},
{"text", "String", "message"},
{"textcolor", "String", "text color"},
{"textfont", "String", "text font"},
{"textsize", "int", "text size"}
};
return info;
}

public void init() {
int r,i;
String aux;
// Set some constants
COLS = size().width;
ROWS = size().height + HIDDEN;
// Get parameters
aux=getParameter("coolinglimit");
if((aux!=null)&&(aux.endsWith("%"))) { aux=aux.substring(0,aux.length()-1); }
COOLING_LIMIT = (aux==null)?(int)(PALETTE_SIZE*0.5):(int)(PALETTE_SIZE*(Integer.valueOf(aux).intValue())/100);
aux=getParameter("coolingrows");
if((aux!=null)&&(aux.endsWith("%"))) { aux=aux.substring(0,aux.length()-1); }
COOLING_ROWS = (aux==null)?(int)(ROWS*0.8):(int)(ROWS*(Integer.valueOf(aux).intValue())/100);
aux=getParameter("coolingfactor");
COOLING_FACTOR= (aux==null)?2:(int)(Integer.valueOf(aux).intValue());
ROWS_RESEED = (int)(ROWS*0.96);
// Get text parameters
aux = getParameter("text");
message=(aux==null)?"":aux;
aux = getParameter("textfont");
textfont=(aux==null)?"TimesRoman":aux;
aux=getParameter("textsize");
textsize=(aux==null)?18:(Integer.valueOf(aux).intValue());
aux=getParameter("textcolor");
textcolor=hexColor(aux,Color.white);
// Setup buffers;
Buffer = new byte[COLS*ROWS];
Buffer2 = new byte[COLS*ROWS];
// Setup palette
for(i=0; i<16; ++i)
palette[i]= new Color(16*i,0,0);
for(i=0; i<16; ++i)
palette[16+i] = new Color(255, 16*i, 0);
for(i=0; i<32; ++i)
palette[32+i] = new Color(255,255,8*i);
// Setup text
Font myFont=new Font(textfont, Font.BOLD, textsize);
FontMetrics myMetrix=getFontMetrics(myFont);
int textH=myMetrix.getHeight();
int textW=myMetrix.stringWidth(message);
textX=(int)((COLS-textW)/2);
textY=ROWS-HIDDEN-(int)((ROWS-HIDDEN-textH)/2)-myMetrix.getDescent();
setFont(myFont);
// Seed image
for(r=COLS*(ROWS-ROWS_SEED); r<(ROWS*COLS); ++r) {
Buffer[r]=(byte)(Math.random()*(PALETTE_SIZE-1));
}
}

void MainLoop() {
int r,a,i;
for(r=COLS+1;r<(COLS*(ROWS-1))-1;++r) {
a=Buffer[r-COLS-1]+Buffer[r-COLS]+Buffer[r-COLS+1]+Buffer[r-1]+Buffer[r+1]+
Buffer[r+COLS-1]+Buffer[r+COLS]+Buffer[r+COLS+1];
// a=(a>>3)%PALETTE_SIZE;
a=(a>>3);
// Cool flames
if(a<COOLING_LIMIT) {
if((r<COOLING_ROWS*COLS)&&(a>COOLING_FACTOR)) a-=COOLING_FACTOR;
}
Buffer2[r]=(byte)(a);
}
// Seed at base
for(r=COLS*(ROWS_RESEED);r<COLS*(ROWS);++r) {
a=Buffer2[r];
Buffer2[r]=(byte)((a-(Math.random()*MAX_SEED))%(PALETTE_SIZE*1.1));
//Buffer2[r]=(byte)((a-(Math.random()*MAX_SEED))%PALETTE_SIZE);
}
// Scroll image
for(i=0;i<COLS*(ROWS-1);++i)
Buffer[i]=Buffer2[i+COLS];
}

public final synchronized void update(Graphics g) {
// Setup off-screen buffer
Dimension d=size();
if((offScrImage==null)||(d.width!=offScrSize.width)||(d.height!=offScrSize.height)) {
offScrImage=createImage(d.width,d.height);
offScrSize=d;
offScrGC=offScrImage.getGraphics();
offScrGC.setFont(getFont());
}
if (offScrGC!=null) {
offScrGC.fillRect(0,0,d.width,d.height);
paint(offScrGC);
g.drawImage(offScrImage,0,0,null);
}
}

public void paint(Graphics g) {
int a;
Color c;
// Do main loop
MainLoop();
// Copy buffer to off-screen buffer
for(int y=0;y<(ROWS-HIDDEN);++y)
for(int x=0;x<COLS;++x) {
a=Buffer[y*COLS+x];
a=a<0?-a:a; // Patch nasty bug
a=a<(PALETTE_SIZE-1)?(a):(PALETTE_SIZE-1);
c=palette[a];
try {
offScrGC.setColor(c);
offScrGC.drawLine(x,y,x+1,y);
} catch (Exception e) { }
}
try {
// Write text
offScrGC.setColor(textcolor);
offScrGC.drawString(message,textX,textY);
// Paint off-screen buffer
g.drawImage(offScrImage,0,0,this);
} catch (Exception e) { }

}

public void start() {
if (kicker==null) {
kicker=new Thread(this);
// kicker.setPriority(kicker.MAX_PRIORITY);
kicker.start();
}
}

public void stop() {
kicker=null;
}

public void run() {
while(kicker!=null) {
repaint();
try {kicker.sleep(15);} catch (InterruptedException e) {}
}
}

// Place fire bubble on click
public boolean mouseDown(java.awt.Event evt, int x, int y) {
int i;
i=x+y*COLS;
if(i>81) {
Buffer[i]=(byte)255;
Buffer[i-COLS]=(byte)255;
Buffer[i+COLS]=(byte)255;
Buffer[i-1]=(byte)255;
Buffer[i+1]=(byte)255;
}
return true;
}

public Color hexColor(String hex, Color std) {
try {
Integer rgb=new Integer(0);
hex.replace('#',' ');
hex.trim();
rgb=Integer.valueOf(hex,16);
return new Color(rgb.intValue());
} catch (Exception e) {
return std;
}
}
}
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