<!doctype html>
<html>
<head>
<meta charset=
"utf-8"
>
<title>3D烟花</title>
<style>
html,body{
margin:0px;
width:100%;
height:100%;
overflow:hidden;
background:#000;
}
#canvas{
width:100%;
height:100%;
}
</style>
</head>
<body>
<canvas id=
"canvas"
></canvas><script>
function
initVars(){
pi=Math.PI;
ctx=canvas.getContext(
"2d"
);
canvas.width=canvas.clientWidth;
canvas.height=canvas.clientHeight;
cx=canvas.width/2;
cy=canvas.height/2;
playerZ=-25;
playerX=playerY=playerVX=playerVY=playerVZ=pitch=yaw=pitchV=yawV=0;
scale=600;
seedTimer=0;seedInterval=5,seedLife=100;gravity=.02;
seeds=
new
Array();
sparkPics=
new
Array();
s=
"https://cantelope.org/NYE/"
;
for
(i=1;i<=10;++i){
sparkPic=
new
Image();
sparkPic.src=s+
"spark"
+i+
".png"
;
sparkPics.push(sparkPic);
}
sparks=
new
Array();
pow1=
new
Audio(s+
"pow1.ogg"
);
pow2=
new
Audio(s+
"pow2.ogg"
);
pow3=
new
Audio(s+
"pow3.ogg"
);
pow4=
new
Audio(s+
"pow4.ogg"
);
frames = 0;
}
function
rasterizePoint(x,y,z){
var
p,d;
x-=playerX;
y-=playerY;
z-=playerZ;
p=Math.
atan2
(x,z);
d=Math.sqrt(x*x+z*z);
x=Math.sin(p-yaw)*d;
z=Math.
cos
(p-yaw)*d;
p=Math.
atan2
(y,z);
d=Math.sqrt(y*y+z*z);
y=Math.sin(p-pitch)*d;
z=Math.
cos
(p-pitch)*d;
var
rx1=-1000,ry1=1,rx2=1000,ry2=1,rx3=0,ry3=0,rx4=x,ry4=z,uc=(ry4-ry3)*(rx2-rx1)-(rx4-rx3)*(ry2-ry1);
if
(!uc)
return
{x:0,y:0,d:-1};
var
ua=((rx4-rx3)*(ry1-ry3)-(ry4-ry3)*(rx1-rx3))/uc;
var
ub=((rx2-rx1)*(ry1-ry3)-(ry2-ry1)*(rx1-rx3))/uc;
if
(!z)z=.000000001;
if
(ua>0&&ua<1&&ub>0&&ub<1){
return
{
x:cx+(rx1+ua*(rx2-rx1))*scale,
y:cy+y/z*scale,
d:Math.sqrt(x*x+y*y+z*z)
};
}
else
{
return
{
x:cx+(rx1+ua*(rx2-rx1))*scale,
y:cy+y/z*scale,
d:-1
};
}
}
function
spawnSeed(){
seed=
new
Object();
seed.x=-50+Math.random()*100;
seed.y=25;
seed.z=-50+Math.random()*100;
seed.vx=.1-Math.random()*.2;
seed.vy=-1.5;
seed.vz=.1-Math.random()*.2;
seed.born=frames;
seeds.push(seed);
}
function
splode(x,y,z){
t=5+parseInt(Math.random()*150);
sparkV=1+Math.random()*2.5;
type=parseInt(Math.random()*3);
switch
(type){
case
0:
pic1=parseInt(Math.random()*10);
break
;
case
1:
pic1=parseInt(Math.random()*10);
do
{ pic2=parseInt(Math.random()*10); }
while
(pic2==pic1);
break
;
case
2:
pic1=parseInt(Math.random()*10);
do
{ pic2=parseInt(Math.random()*10); }
while
(pic2==pic1);
do
{ pic3=parseInt(Math.random()*10); }
while
(pic3==pic1 || pic3==pic2);
break
;
}
for
(m=1;m<t;++m){
spark=
new
Object();
spark.x=x; spark.y=y; spark.z=z;
p1=pi*2*Math.random();
p2=pi*Math.random();
v=sparkV*(1+Math.random()/6)
spark.vx=Math.sin(p1)*Math.sin(p2)*v;
spark.vz=Math.
cos
(p1)*Math.sin(p2)*v;
spark.vy=Math.
cos
(p2)*v;
switch
(type){
case
0: spark.img=sparkPics[pic1];
break
;
case
1:
spark.img=sparkPics[parseInt(Math.random()*2)?pic1:pic2];
break
;
case
2:
switch
(parseInt(Math.random()*3)){
case
0: spark.img=sparkPics[pic1];
break
;
case
1: spark.img=sparkPics[pic2];
break
;
case
2: spark.img=sparkPics[pic3];
break
;
}
break
;
}
spark.radius=25+Math.random()*50;
spark.alpha=1;
spark.trail=
new
Array();
sparks.push(spark);
}
switch
(parseInt(Math.random()*4)){
case
0: pow=
new
Audio(s+
"pow1.ogg"
);
break
;
case
1: pow=
new
Audio(s+
"pow2.ogg"
);
break
;
case
2: pow=
new
Audio(s+
"pow3.ogg"
);
break
;
case
3: pow=
new
Audio(s+
"pow4.ogg"
);
break
;
}
d=Math.sqrt((x-playerX)*(x-playerX)+(y-playerY)*(y-playerY)+(z-playerZ)*(z-playerZ));
pow.volume=1.5/(1+d/10);
pow.play();
}
function
doLogic(){
if
(seedTimer<frames){
seedTimer=frames+seedInterval*Math.random()*10;
spawnSeed();
}
for
(i=0;i<seeds.length;++i){
seeds[i].vy+=gravity;
seeds[i].x+=seeds[i].vx;
seeds[i].y+=seeds[i].vy;
seeds[i].z+=seeds[i].vz;
if
(frames-seeds[i].born>seedLife){
splode(seeds[i].x,seeds[i].y,seeds[i].z);
seeds.splice(i,1);
}
}
for
(i=0;i<sparks.length;++i){
if
(sparks[i].alpha>0 && sparks[i].radius>5){
sparks[i].alpha-=.01;
sparks[i].radius/=1.02;
sparks[i].vy+=gravity;
point=
new
Object();
point.x=sparks[i].x;
point.y=sparks[i].y;
point.z=sparks[i].z;
if
(sparks[i].trail.length){
x=sparks[i].trail[sparks[i].trail.length-1].x;
y=sparks[i].trail[sparks[i].trail.length-1].y;
z=sparks[i].trail[sparks[i].trail.length-1].z;
d=((point.x-x)*(point.x-x)+(point.y-y)*(point.y-y)+(point.z-z)*(point.z-z));
if
(d>9){
sparks[i].trail.push(point);
}
}
else
{
sparks[i].trail.push(point);
}
if
(sparks[i].trail.length>5)sparks[i].trail.splice(0,1);
sparks[i].x+=sparks[i].vx;
sparks[i].y+=sparks[i].vy;
sparks[i].z+=sparks[i].vz;
sparks[i].vx/=1.075;
sparks[i].vy/=1.075;
sparks[i].vz/=1.075;
}
else
{
sparks.splice(i,1);
}
}
p=Math.
atan2
(playerX,playerZ);
d=Math.sqrt(playerX*playerX+playerZ*playerZ);
d+=Math.sin(frames/80)/1.25;
t=Math.sin(frames/200)/40;
playerX=Math.sin(p+t)*d;
playerZ=Math.
cos
(p+t)*d;
yaw=pi+p+t;
}
function
rgb(col){
var
r = parseInt((.5+Math.sin(col)*.5)*16);
var
g = parseInt((.5+Math.
cos
(col)*.5)*16);
var
b = parseInt((.5-Math.sin(col)*.5)*16);
return
"#"
+r.toString(16)+g.toString(16)+b.toString(16);
}
function
draw(){
ctx.clearRect(0,0,cx*2,cy*2);
ctx.fillStyle=
"#ff8"
;
for
(i=-100;i<100;i+=3){
for
(j=-100;j<100;j+=4){
x=i;z=j;y=25;
point=rasterizePoint(x,y,z);
if
(point.d!=-1){
size=250/(1+point.d);
d = Math.sqrt(x * x + z * z);
a = 0.75 - Math.pow(d / 100, 6) * 0.75;
if
(a>0){
ctx.globalAlpha = a;
ctx.fillRect(point.x-size/2,point.y-size/2,size,size);
}
}
}
}
ctx.globalAlpha=1;
for
(i=0;i<seeds.length;++i){
point=rasterizePoint(seeds[i].x,seeds[i].y,seeds[i].z);
if
(point.d!=-1){
size=200/(1+point.d);
ctx.fillRect(point.x-size/2,point.y-size/2,size,size);
}
}
point1=
new
Object();
for
(i=0;i<sparks.length;++i){
point=rasterizePoint(sparks[i].x,sparks[i].y,sparks[i].z);
if
(point.d!=-1){
size=sparks[i].radius*200/(1+point.d);
if
(sparks[i].alpha<0)sparks[i].alpha=0;
if
(sparks[i].trail.length){
point1.x=point.x;
point1.y=point.y;
switch
(sparks[i].img){
case
sparkPics[0]:ctx.strokeStyle=
"#f84"
;
break
;
case
sparkPics[1]:ctx.strokeStyle=
"#84f"
;
break
;
case
sparkPics[2]:ctx.strokeStyle=
"#8ff"
;
break
;
case
sparkPics[3]:ctx.strokeStyle=
"#fff"
;
break
;
case
sparkPics[4]:ctx.strokeStyle=
"#4f8"
;
break
;
case
sparkPics[5]:ctx.strokeStyle=
"#f44"
;
break
;
case
sparkPics[6]:ctx.strokeStyle=
"#f84"
;
break
;
case
sparkPics[7]:ctx.strokeStyle=
"#84f"
;
break
;
case
sparkPics[8]:ctx.strokeStyle=
"#fff"
;
break
;
case
sparkPics[9]:ctx.strokeStyle=
"#44f"
;
break
;
}
for
(j=sparks[i].trail.length-1;j>=0;--j){
point2=rasterizePoint(sparks[i].trail[j].x,sparks[i].trail[j].y,sparks[i].trail[j].z);
if
(point2.d!=-1){
ctx.globalAlpha=j/sparks[i].trail.length*sparks[i].alpha/2;
ctx.beginPath();
ctx.moveTo(point1.x,point1.y);
ctx.lineWidth=1+sparks[i].radius*10/(sparks[i].trail.length-j)/(1+point2.d);
ctx.lineTo(point2.x,point2.y);
ctx.stroke();
point1.x=point2.x;
point1.y=point2.y;
}
}
}
ctx.globalAlpha=sparks[i].alpha;
ctx.drawImage(sparks[i].img,point.x-size/2,point.y-size/2,size,size);
}
}
}
function
frame(){
if
(frames>100000){
seedTimer=0;
frames=0;
}
frames++;
draw();
doLogic();
requestAnimationFrame(frame);
}
window.addEventListener(
"resize"
,()=>{
canvas.width=canvas.clientWidth;
canvas.height=canvas.clientHeight;
cx=canvas.width/2;
cy=canvas.height/2;
});
initVars();
frame();</script>
<div style=
"text-align:center;"
>
</div>
</body>
</html>