VML完美版星星
<HTML xmlns:v = "urn:schemas-microsoft-com:vml"><HEAD>
<TITLE>VML Animation - Stars－www.51windows.Net</TITLE>
<OBJECT classid=CLSID:10072CEC-8CC1-11D1-986E-00A0C955B42E
id=VMLRender></OBJECT>
<STYLE>v\:* {
BEHAVIOR: url(#VMLRender)
}
</STYLE>
</HEAD>
<BODY bgColor=#ffffff onresize=resize() scroll=no>
<v:rect id=bg
style="HEIGHT:400pt;LEFT:0pt;POSITION:absolute;TOP:0pt;WIDTH:880pt;Z-INDEX:-1"
coordsize = "21600,21600"
fillcolor = "#a8f4f7"
strokecolor="#000000">
<v:fill type = "gradient"
color2 = "#003159"
angle = "45"
focus = "100%"
focusposition = ".5,.5"
focussize = "0,0"
method = "linear sigma">
</v:fill>
</v:rect>
<script>
//globals for HSV to RGB conversion
irpnt=new Array(2,1,0,0,3,2);
igpnt=new Array(3,2,2,1,0,0);
ibpnt=new Array(0,0,3,2,2,1);
//
w=0;
h=0;
resize();
scol=new colour(57,.61,.89);
ss=new Array(50,90,75,50,60);
vs="";
for(j=0;j<ss.length;j++){
np=3+rnd(6);
sp=makestarpath(np,1000,900);
hue=rnd(360);
dhue=1+rnd(10);
theta=0;
dtheta=0.1+0.2*Math.random();
dr=rnd(14)-6;if(dr==0)dr=-7;
vx=rnd(10)-4;if(vx==0)vx=-5;
vy=rnd(10)-4;if(vy==0)vy=-5;
vs+="<v:shape id='V"+j+"' np="+np+" hue="+hue+" dhue="+dhue+" dr="+dr+" theta="+theta+" dtheta="+dtheta+" vx="+vx+" vy="+vy+" style='position:absolute;left:"+(6+rnd(w-ss[j]-12))+"px;top:"+(6+rnd(h-ss[j]-12))+"px;height:"+ss[j]+";width:"+ss[j]+";rotation:0;' fill='true' stroke='false' coordsize='2000,2000' coordorigin '0,0' fillcolor='#fdf9ae' strokeweight='2emu' path='"+sp+"'><v:fill type='gradientRadial' color2='#6f6022' angle='45' focus='100%' focusposition='.5,.5' focussize='2,2' method='linear sigma'></v:fill></v:shape>"
}
document.write(vs);
window.setInterval("frame();",20);
function frame(){
for(j=0;j<ss.length;j++){
S=document.all["V"+j];
//animate colour
hue=parseInt(S.hue);
dhue=parseInt(S.dhue);
hue+=dhue;
if(hue>=360)hue-=360;
S.hue=hue;
scol.h=hue;
scol.hsv2rgb();
S.fillcolor=scol.rgb;
//animate rotation
r=parseInt(S.style.rotation);
dr=parseInt(S.dr);
r+=dr;if(r>=360)r-=360;if(r<0)r+=360;
S.style.rotation=r;
//animate geometry
np=parseInt(S.np);
theta=parseFloat(S.theta);
dtheta=parseFloat(S.dtheta);
theta+=dtheta;if(theta>Math.PI)theta-=2*Math.PI;
sp=makestarpath(np,1000,200+1000*Math.sin(theta));
S.path=sp;
S.theta=theta;
//move & bounce stars
x=S.style.pixelLeft;
y=S.style.pixelTop;
vx=parseInt(S.vx);
vy=parseInt(S.vy);
x+=vx;
y+=vy;
if(x<0){vx=-vx;x+=vx;}
if(x>w-ss[j]){vx=-vx;x=2*(w-ss[j])-x;}
if(x>w-ss[j])x=0;
if(x<0)x=0;
if(y<0){vy=-vy;y+=vy;}
if(y>h-ss[j]){vy=-vy;y=2*(h-ss[j])-y;}
if(y>h-ss[j])y=0;
if(y<0)y=0;
S.style.pixelLeft=x;
S.style.pixelTop=y;
S.vx=vx;
S.vy=vy;
}
}
//n=number of points
//r1=outer diameter
//r2=inner diameter
//assumes coordsize='2000,2000' coordorigin '0,0'
function makestarpath(n,r1,r2){
s="";
pa=2*Math.PI/n;
ss1=Math.PI/2;
ss2=ss1-pa/2;
x1=Math.floor(r1*Math.cos(ss1));
y1=Math.floor(-r1*Math.sin(ss1));
x2=Math.floor(r2*Math.cos(ss2));
y2=Math.floor(-r2*Math.sin(ss2));
s="m "+(x2+1000)+","+(y2+1000)+" l ";
for (i=1;i<=n;i++){
if(i>1)s+=","
s+=(x1+1000)+","+(y1+1000)+",";
s1=ss1+i*pa;
s2=ss2+i*pa;
x1=Math.floor(r1*Math.cos(s1));
y1=Math.floor(-r1*Math.sin(s1));
x2=Math.floor(r2*Math.cos(s2));
y2=Math.floor(-r2*Math.sin(s2));
s+=(x2+1000)+","+(y2+1000);
}
s+=" e"
return(s);
}
function rnd(n){
return(Math.floor((n+1)*Math.random()));
}
function resize(){
w=document.body.clientWidth;
h=document.body.clientHeight;
bg.style.width=w;
bg.style.height=h;
}
//utility object for HSV to RGB conversion
function hsv2rgb(){
pqvt=new Array(4);
with(this){
if(s==0){
r=Math.floor(255*v);
g=r;
b=r;
return;
}
if(h>=360)h=0;
nh=h/60;
i=Math.floor(nh);
f=nh-i;
pqvt[2]=255*v;
pqvt[0]=pqvt[2]*(1-s)
pqvt[1]=pqvt[2]*(1-s*f)
pqvt[3]=pqvt[2]*(1-s*(1-f))
r=Math.floor(pqvt[irpnt[i]]);
g=Math.floor(pqvt[igpnt[i]]);
b=Math.floor(pqvt[ibpnt[i]]);
rgb="#"+(65536*r+256*g+b).toString(16);
}
}
function colour(h,s,v){
this.h=h; //0-359
this.s=s; //0-1
this.v=v; //0-1
this.r=0; //0-255
this.g=0; //0-255
this.b=0; //0-255
this.rgb="";
this.hsv2rgb=hsv2rgb;
//convert on construction
this.hsv2rgb();
}
</script>
</BODY></HTML>