新年快乐! javascript实现超级炫酷的3D烟花特效
程序员文章站
2022-06-10 17:47:09
本文实例为大家分享了javascript实现3d烟花特效的具体代码，供大家参考，具体内容如下
本文实例为大家分享了javascript实现3d烟花特效的具体代码，供大家参考，具体内容如下
<!doctype html>
<html>
<head>
<meta charset="utf-8" />
<title></title>
<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" width="825" height="631"></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;//*(1+math.random()/2);
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>
</body>
</html>
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。
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