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JS如何实现实现超好看的3D烟花特效?(代码示例)

本篇文章给大家通过实例介绍一下使用JS如何实现实现超好看的3D烟花特效?有一定的参考价值,有需要的朋友可以参考一下,希望对大家有所帮助。 废话不多说,直接上代码: <!doc…

本篇文章给大家通过实例介绍一下使用JS如何实现实现超好看的3D烟花特效?有一定的参考价值,有需要的朋友可以参考一下,希望对大家有所帮助。

废话不多说,直接上代码:

<!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;//*(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><div style="text-align:center;"></div></body></html>

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