3D烟花特效-超级炫酷！ - 好文

<!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>

热门工具换一换