去掉了场景的旋转, 因为把我头都转晕了.
html 代码
- <!DOCTYPE html>
- <html lang="en">
- <head>
- <meta charset="UTF-8">
- <title>Title</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",function(){
- canvas.width=canvas.clientWidth;
- canvas.height=canvas.clientHeight;
- cx=canvas.width/2;
- cy=canvas.height/2;
- });
- initVars();
- frame();
- </script>
- </body>
- </html>
来源: http://www.qdfuns.com/article/34594/6e7fe863644514df60dc0e0e6f021f7a.html