js工具类

1.3D烟花

　　yanhua3D.js

var yanhua3D = function(){
    var yanhua;
    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);
    }

    function bind(){
        window.addEventListener("resize",function(){
            canvas.width=canvas.clientWidth;
            canvas.height=canvas.clientHeight;
            cx=canvas.width/2;
            cy=canvas.height/2; 
        });
    }
    function init(){
        //初始化canvas
        var yanhua3d = document.getElementById("yanhua3d");
        yanhua3d.style.backgroundColor="#000";
        var canvas = document.createElement("canvas");
        canvas.id="canvas";
        canvas.style.width="100%";
        canvas.style.height="100%";
        yanhua3d.appendChild(canvas);
        initVars();
        bind();
        frame();
    };
    yanhua = { 
        create3Dyuanhua:init
    };
    return yanhua;
}();

　　yanhua3D.css

@charset "utf-8";
html, body, div, span, applet, object, iframe, h1, h2, h3, h4, h5, h6, p, blockquote, pre, a, abbr, acronym, address, big, cite, code, del, dfn, em, font, img, ins, kbd, q, s, samp, small, strike, strong, sub, sup, tt, var, b, u, i, center, dl, dt, dd, ol, ul, li, fieldset, form, label, legend, table, caption, tbody, tfoot, thead, tr, th, td{margin:0;padding:0;border:0;outline:0;font-size:100%;vertical-align:baseline;background:transparent}
body{line-height:1}
ol, ul{list-style:none}
blockquote, q{quotes:none}
blockquote:before, blockquote:after, q:before, q:after{content:'';content:none}
:focus{outline:0}
ins{text-decoration:none}
del{text-decoration:line-through}
table{border-collapse:collapse;border-spacing:0}
a{text-decoration:none;color:#fff}
body{font-family:"Kreon";font-weight:300;color:#333;background:#f5f5f5}

#switcher{height:54px;z-index:99999;position:fixed;100%;top:0;background:#000;}
.center{100%;padding-top:0}
.center ul li{display:inline;float:left;position:relative}
.logoTop,.top2{margin-left:30px;margin-top:20px;color:#fff;font-weight:bold;font-family:"微软雅黑"}

.top2{position:relative;margin-top:16px;font-size:12px;font-weight:normal;background-image:url(../i/2vm.png);background-repeat:no-repeat;background-position:3px center;height:20px;padding-left:25px;line-height:20px;border:1px solid #414141;padding-right:5px;border-radius:5px;}
.vm{position:absolute;top:20px;left:0px;background-color:#fff;height:170px;150px;display:none;padding:30px;}
.top2:hover .vm{display:block}
.logoTop a:hover{text-decoration:underline}

li.remove_frame{margin-left:17px;float:right!important;margin-right:30px}
li.remove_frame a{background:url(../i/cross2.png) no-repeat 0 0;20px;height:21px;display:block;margin-top:18px;transition:all .3s ease-out 0s}
li.remove_frame a:hover{background-position:0 -21px}
#iframe{margin-top:0}
.icon-monitor, .icon-tablet, .icon-mobile-1, .icon-mobile-2, .icon-mobile-3{margin-right:7px;margin-top:20px;17px;height:16px;background:url(../i/mon-spr.png) no-repeat;}

.icon-monitor{margin-left:10px;background-position:0 0;}
.icon-tablet{background-position:-24px 0}
.icon-mobile-1{background-position:-49px 0}
.icon-monitor:hover, .icon-monitor.active{background-position:0 -16px}
.icon-tablet:hover, .icon-tablet.active{background-position:-24px -16px}
.icon-mobile-1:hover, .icon-mobile-1.active{background-position:-49px -16px}
.icon-mobile-2{background-position:-71px 0}
.icon-mobile-3{background-position:-94px 0}
.icon-mobile-2:hover, .icon-mobile-2.active{background-position:-71px -16px}
.icon-mobile-3:hover, .icon-mobile-3.active{background-position:-94px -16px}

#iframe-wrap{height:100%;overflow:visible;position:relative;top:54px;z-index:50}
.tablet-width{height:960px!important;margin:0 auto;padding:175px 100px 115px 100px;785px;margin-top:40px;background:url(../i/bg-mob.png) no-repeat 0 0}
.tablet-width iframe{height:960px!important}
.mobile-width{height:703px!important;margin:0 auto;padding:165px 115px 100px 100px;1041px;margin-top:40px;background:url(../i/bg-mob.png) no-repeat 0 -1249px}
.mobile-width iframe{height:704px!important}
.mobile-width-2{height:417px!important;margin:0 auto;padding:125px 25px 159px 25px;337px;margin-top:40px;background:url(../i/bg-mob.png) no-repeat 0 -2217px}
.mobile-width-2 iframe{height:416px!important}
.mobile-width-3{height:256px!important;margin:0 auto;padding:45px 115px 69px 105px;497px;margin-top:40px;background:url(../i/bg-mob.png) no-repeat -387px -2217px}
.mobile-width-3 iframe{height:256px!important}
#by{overflow-y:hidden}

　　yanhua3D.html

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title>3D烟花</title>
        <link rel="stylesheet" href="demo.css" />
    </head>
    <body>
        <div id="yanhua3d" style=" 1000px;height: 600px;">
        </div>
        <script src="yanhuo3D.js" type="text/javascript"></script>
        <script>
            yanhua3D.create3Dyuanhua();
        </script>
    </body>
</html>

　　使用方法：

使用方法：
    引入yanhuo3D.js工具和对应得样式文件yanhuo3D.css

    在需要引用烟火得地方加入：<div id="yanhua3d" style=" 1000px;height: 600px;></div>
    之后就能获得yanhua3D全局变量，通过它调用yanhua3D.create3Dyuanhua();用yanhua3d创建出烟火对象，
    通过设置div大小从而调整了烟火得大小