html+css+js实现的新年烟花

女爷i 2024-03-30 17:55 76阅读 0赞

## html+css+js实现的新年烟花程序 ##

效果展示：  
![在这里插入图片描述][63a73c9d41384c13aa370500889239cc.png]

**烟花简介**：

烟花又称花炮、烟火、焰火、炮仗，根据《中国烟花爆竹标准—安全与质量》对烟花爆竹的定义为：以烟火药为原料，用于产生声光色的娱乐用品。中国劳动人民较早发明，常用于盛大的典礼或表演中。  
烟花其实和爆竹的结构类似，其结构都包含黑火药和药引。为了达到好的表演效果，焰火和礼花弹中填充了大量用于发射以及爆炸的火药，例如，一个直径为20厘米的礼花弹在发射后，要上升到大概200米的高空才会爆炸，而这些星星点点覆盖的半径大约可以有80米左右。

本烟花的制作主要使用的技术是，js里面的canvas，制作厉害的前端，需要的就是这个东西。

Canvas 中文名称叫“画布”，它是游戏中所有UI组件的“容器”。一个场景中，可以允许多个Canvas对象的存在，还允许Canvas之间可以进行“嵌套”使用。需要注意的是，场景中的任何一个UI对象，都肯定是某个Canvas对象的“子级”。

### 代码部分 ###

想要修改显示的内容的话，需要修改这个地方，最开始的地方是时间倒计时，然后是显示的文字，最后这个程序也是可以现实图形的，格式是最后一个参数的样子，\#图形的名字。

<!doctype html>
    <html>
    <head>
    <meta charset="utf-8">
    <title>烟花</title>
     
    <style>
    html,body{
          
        margin:0px;
        width:100%;
        height:100%;
        overflow:hidden;
        background:#000;
    }
    .music{
          
      display: none;
    }
    
    </style>
     
    </head>
    <body>
    
    <canvas id="canvas" style="position:absolute;width:100%;height:100%;z-index:8888"></canvas>
    <canvas style="position:absolute;width:100%;height:100%;z-index:9999" class="canvas" ></canvas>
    <div class="overlay">
      <div class="tabs">
        <div class="tabs-labels"><span class="tabs-label">Commands</span><span class="tabs-label">Info</span><span class="tabs-label">Share</span></div>
     
        <div class="tabs-panels">
          <ul class="tabs-panel commands">
          </ul>
        </div>
      </div>
    </div>
    <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>
    <script>
         
         
    /*
     
      Shape Shifter
      =============
      A canvas experiment by Kenneth Cachia
      http://www.kennethcachia.com
     
      Updated code
      ------------
      https://github.com/kennethcachia/Shape-Shifter
     
    */
     
     
    var S = {
          
      init: function () {
          
        var action = window.location.href,
            i = action.indexOf('?a=');
     
        S.Drawing.init('.canvas');
        document.body.classList.add('body--ready');
     
        if (i !== -1) {
          
          S.UI.simulate(decodeURI(action).substring(i + 3));
        } else {
          
          S.UI.simulate('|#countdown 10|2023|新年快乐|#rectangle|');
        }
     
        S.Drawing.loop(function () {
          
          S.Shape.render();
        });
      }
    };
     
     
    S.Drawing = (function () {
          
      var canvas,
          context,
          renderFn
          requestFrame = window.requestAnimationFrame       ||
                         window.webkitRequestAnimationFrame ||
                         window.mozRequestAnimationFrame    ||
                         window.oRequestAnimationFrame      ||
                         window.msRequestAnimationFrame     ||
                         function(callback) {
          
                           window.setTimeout(callback, 1000 / 60);
                         };
     
      return {
          
        init: function (el) {
          
          canvas = document.querySelector(el);
          context = canvas.getContext('2d');
          this.adjustCanvas();
     
          window.addEventListener('resize', function (e) {
          
            S.Drawing.adjustCanvas();
          });
        },
     
        loop: function (fn) {
          
          renderFn = !renderFn ? fn : renderFn;
          this.clearFrame();
          renderFn();
          requestFrame.call(window, this.loop.bind(this));
        },
     
        adjustCanvas: function () {
          
          canvas.width = window.innerWidth;
          canvas.height = window.innerHeight;
        },
     
        clearFrame: function () {
          
          context.clearRect(0, 0, canvas.width, canvas.height);
        },
     
        getArea: function () {
          
          return {
           w: canvas.width, h: canvas.height };
        },
     
        drawCircle: function (p, c) {
          
          context.fillStyle = c.render();
          context.beginPath();
          context.arc(p.x, p.y, p.z, 0, 2 * Math.PI, true);
          context.closePath();
          context.fill();
        }
      }
    }());
     
     
    S.UI = (function () {
          
      var canvas = document.querySelector('.canvas'),
          interval,
          isTouch = false, //('ontouchstart' in window || navigator.msMaxTouchPoints),
          currentAction,
          resizeTimer,
          time,
          maxShapeSize = 30,
          firstAction = true,
          sequence = [],
          cmd = '#';
     
      function formatTime(date) {
          
        var h = date.getHours(),
            m = date.getMinutes(),
        m = m < 10 ? '0' + m : m;
        return h + ':' + m;
      }
     
      function getValue(value) {
          
        return value && value.split(' ')[1];
      }
     
      function getAction(value) {
          
        value = value && value.split(' ')[0];
        return value && value[0] === cmd && value.substring(1);
      }
     
      function timedAction(fn, delay, max, reverse) {
          
        clearInterval(interval);
        currentAction = reverse ? max : 1;
        fn(currentAction);
     
        if (!max || (!reverse && currentAction < max) || (reverse && currentAction > 0)) {
          
          interval = setInterval(function () {
          
            currentAction = reverse ? currentAction - 1 : currentAction + 1;
            fn(currentAction);
     
            if ((!reverse && max && currentAction === max) || (reverse && currentAction === 0)) {
          
              clearInterval(interval);
            }
          }, delay);
        }
      }
     
      function reset(destroy) {
          
        clearInterval(interval);
        sequence = [];
        time = null;
        destroy && S.Shape.switchShape(S.ShapeBuilder.letter(''));
      }
     
      function performAction(value) {
          
        var action,
            value,
            current;
     
        // overlay.classList.remove('overlay--visible');
        sequence = typeof(value) === 'object' ? value : sequence.concat(value.split('|'));
        // input.value = '';
        // checkInputWidth();
     
        timedAction(function (index) {
          
          current = sequence.shift();
          action = getAction(current);
          value = getValue(current);
     
          switch (action) {
          
            case 'countdown':
              value = parseInt(value) || 10;
              value = value > 0 ? value : 10;
     
              timedAction(function (index) {
          
                if (index === 0) {
          
                  if (sequence.length === 0) {
          
                    S.Shape.switchShape(S.ShapeBuilder.letter(''));
                  } else {
          
                    performAction(sequence);
                  }
                } else {
          
                  S.Shape.switchShape(S.ShapeBuilder.letter(index), true);
                }
              }, 1000, value, true);
              break;
     
            case 'rectangle':
              value = value && value.split('x');
              value = (value && value.length === 2) ? value : [maxShapeSize, maxShapeSize / 2];
     
              S.Shape.switchShape(S.ShapeBuilder.rectangle(Math.min(maxShapeSize, parseInt(value[0])), Math.min(maxShapeSize, parseInt(value[1]))));
              break;
     
            case 'circle':
              value = parseInt(value) || maxShapeSize;
              value = Math.min(value, maxShapeSize);
              S.Shape.switchShape(S.ShapeBuilder.circle(value));
              break;
     
            case 'time':
              var t = formatTime(new Date());
     
              if (sequence.length > 0) {
          
                S.Shape.switchShape(S.ShapeBuilder.letter(t));
              } else {
          
                timedAction(function () {
          
                  t = formatTime(new Date());
                  if (t !== time) {
          
                    time = t;
                    S.Shape.switchShape(S.ShapeBuilder.letter(time));
                  }
                }, 1000);
              }
              break;
     
            default:
              S.Shape.switchShape(S.ShapeBuilder.letter(current[0] === cmd ? 'What?' : current));
          }
        }, 2000, sequence.length);
      }
     
      function checkInputWidth(e) {
          
        if (input.value.length > 18) {
          
          ui.classList.add('ui--wide');
        } else {
          
          ui.classList.remove('ui--wide');
        }
     
        if (firstAction && input.value.length > 0) {
          
          ui.classList.add('ui--enter');
        } else {
          
          ui.classList.remove('ui--enter');
        }
      }
     
      function bindEvents() {
          
        document.body.addEventListener('keydown', function (e) {
          
          input.focus();
     
          if (e.keyCode === 13) {
          
            firstAction = false;
            reset();
            performAction(input.value);
          }
        });
     
        canvas.addEventListener('click', function (e) {
          
          overlay.classList.remove('overlay--visible');
        });
      }
     
      function init() {
          
        bindEvents();
        // input.focus();
        isTouch && document.body.classList.add('touch');
      }
     
      // Init
      init();
     
      return {
          
        simulate: function (action) {
          
          performAction(action);
        }
      }
    }());
     
     
    S.UI.Tabs = (function () {
          
      var tabs = document.querySelector('.tabs'),
          labels = document.querySelector('.tabs-labels'),
          triggers = document.querySelectorAll('.tabs-label'),
          panels = document.querySelectorAll('.tabs-panel');
     
      function activate(i) {
          
        triggers[i].classList.add('tabs-label--active');
        panels[i].classList.add('tabs-panel--active');
      }
     
      function bindEvents() {
          
        labels.addEventListener('click', function (e) {
          
          var el = e.target,
              index;
     
          if (el.classList.contains('tabs-label')) {
          
            for (var t = 0; t < triggers.length; t++) {
          
              triggers[t].classList.remove('tabs-label--active');
              panels[t].classList.remove('tabs-panel--active');
     
              if (el === triggers[t]) {
          
                index = t;
              }
            }
     
            activate(index);
          }
        });
      }
     
      function init() {
          
        activate(0);
        bindEvents();
      }
     
      // Init
      init();
    }());
     
     
    S.Point = function (args) {
          
      this.x = args.x;
      this.y = args.y;
      this.z = args.z;
      this.a = args.a;
      this.h = args.h;
    };
     
     
    S.Color = function (r, g, b, a) {
          
      this.r = r;
      this.g = g;
      this.b = b;
      this.a = a;
    };
     
    S.Color.prototype = {
          
      render: function () {
          
        return 'rgba(' + this.r + ',' +  + this.g + ',' + this.b + ',' + this.a + ')';
      }
    };
     
     
    S.Dot = function (x, y) {
          
      this.p = new S.Point({
          
        x: x,
        y: y,
        z: 5,
        a: 1,
        h: 0
      });
     
      this.e = 0.07;
      this.s = true;
     
      this.c = new S.Color(255, 255, 255, this.p.a);
     
      this.t = this.clone();
      this.q = [];
    };
     
    S.Dot.prototype = {
          
      clone: function () {
          
        return new S.Point({
          
          x: this.x,
          y: this.y,
          z: this.z,
          a: this.a,
          h: this.h
        });
      },
     
      _draw: function () {
          
        this.c.a = this.p.a;
        S.Drawing.drawCircle(this.p, this.c);
      },
     
      _moveTowards: function (n) {
          
        var details = this.distanceTo(n, true),
            dx = details[0],
            dy = details[1],
            d = details[2],
            e = this.e * d;
     
        if (this.p.h === -1) {
          
          this.p.x = n.x;
          this.p.y = n.y;
          return true;
        }
     
        if (d > 1) {
          
          this.p.x -= ((dx / d) * e);
          this.p.y -= ((dy / d) * e);
        } else {
          
          if (this.p.h > 0) {
          
            this.p.h--;
          } else {
          
            return true;
          }
        }
     
        return false;
      },
     
      _update: function () {
          
        if (this._moveTowards(this.t)) {
          
          var p = this.q.shift();
     
          if (p) {
          
            this.t.x = p.x || this.p.x;
            this.t.y = p.y || this.p.y;
            this.t.z = p.z || this.p.z;
            this.t.a = p.a || this.p.a;
            this.p.h = p.h || 0;
          } else {
          
            if (this.s) {
          
              this.p.x -= Math.sin(Math.random() * 3.142);
              this.p.y -= Math.sin(Math.random() * 3.142);
            } else {
          
              this.move(new S.Point({
          
                x: this.p.x + (Math.random() * 50) - 25,
                y: this.p.y + (Math.random() * 50) - 25,
              }));
            }
          }
        }
     
        d = this.p.a - this.t.a;
        this.p.a = Math.max(0.1, this.p.a - (d * 0.05));
        d = this.p.z - this.t.z;
        this.p.z = Math.max(1, this.p.z - (d * 0.05));
      },
     
      distanceTo: function (n, details) {
          
        var dx = this.p.x - n.x,
            dy = this.p.y - n.y,
            d = Math.sqrt(dx * dx + dy * dy);
     
        return details ? [dx, dy, d] : d;
      },
     
      move: function (p, avoidStatic) {
          
        if (!avoidStatic || (avoidStatic && this.distanceTo(p) > 1)) {
          
          this.q.push(p);
        }
      },
     
      render: function () {
          
        this._update();
        this._draw();
      }
    }
     
     
    S.ShapeBuilder = (function () {
          
      var gap = 13,
          shapeCanvas = document.createElement('canvas'),
          shapeContext = shapeCanvas.getContext('2d'),
          fontSize = 500,
          fontFamily = 'Avenir, Helvetica Neue, Helvetica, Arial, sans-serif';
     
      function fit() {
          
        shapeCanvas.width = Math.floor(window.innerWidth / gap) * gap;
        shapeCanvas.height = Math.floor(window.innerHeight / gap) * gap;
        shapeContext.fillStyle = 'red';
        shapeContext.textBaseline = 'middle';
        shapeContext.textAlign = 'center';
      }
     
      function processCanvas() {
          
        var pixels = shapeContext.getImageData(0, 0, shapeCanvas.width, shapeCanvas.height).data;
            dots = [],
            pixels,
            x = 0,
            y = 0,
            fx = shapeCanvas.width,
            fy = shapeCanvas.height,
            w = 0,
            h = 0;
     
        for (var p = 0; p < pixels.length; p += (4 * gap)) {
          
          if (pixels[p + 3] > 0) {
          
            dots.push(new S.Point({
          
              x: x,
              y: y
            }));
     
            w = x > w ? x : w;
            h = y > h ? y : h;
            fx = x < fx ? x : fx;
            fy = y < fy ? y : fy;
          }
     
          x += gap;
     
          if (x >= shapeCanvas.width) {
          
            x = 0;
            y += gap;
            p += gap * 4 * shapeCanvas.width;
          }
        }
     
        return {
           dots: dots, w: w + fx, h: h + fy };
      }
     
      function setFontSize(s) {
          
        shapeContext.font = 'bold ' + s + 'px ' + fontFamily;
      }
     
      function isNumber(n) {
          
        return !isNaN(parseFloat(n)) && isFinite(n);
      }
     
      function init() {
          
        fit();
        window.addEventListener('resize', fit);
      }
     
      // Init
      init();
     
      return {
          
        imageFile: function (url, callback) {
          
          var image = new Image(),
              a = S.Drawing.getArea();
     
          image.onload = function () {
          
            shapeContext.clearRect(0, 0, shapeCanvas.width, shapeCanvas.height);
            shapeContext.drawImage(this, 0, 0, a.h * 0.6, a.h * 0.6);
            callback(processCanvas());
          };
     
          image.onerror = function () {
          
            callback(S.ShapeBuilder.letter('What?'));
          }
     
          image.src = url;
        },
     
        circle: function (d) {
          
          var r = Math.max(0, d) / 2;
          shapeContext.clearRect(0, 0, shapeCanvas.width, shapeCanvas.height);
          shapeContext.beginPath();
          shapeContext.arc(r * gap, r * gap, r * gap, 0, 2 * Math.PI, false);
          shapeContext.fill();
          shapeContext.closePath();
     
          return processCanvas();
        },
     
        letter: function (l) {
          
          var s = 0;
     
          setFontSize(fontSize);
          s = Math.min(fontSize,
                      (shapeCanvas.width / shapeContext.measureText(l).width) * 0.8 * fontSize,
                      (shapeCanvas.height / fontSize) * (isNumber(l) ? 1 : 0.45) * fontSize);
          setFontSize(s);
     
          shapeContext.clearRect(0, 0, shapeCanvas.width, shapeCanvas.height);
          shapeContext.fillText(l, shapeCanvas.width / 2, shapeCanvas.height / 2);
     
          return processCanvas();
        },
     
        rectangle: function (w, h) {
          
          var dots = [],
              width = gap * w,
              height = gap * h;
     
          for (var y = 0; y < height; y += gap) {
          
            for (var x = 0; x < width; x += gap) {
          
              dots.push(new S.Point({
          
                x: x,
                y: y,
              }));
            }
          }
     
          return {
           dots: dots, w: width, h: height };
        }
      };
    }());
     
     
    S.Shape = (function () {
          
      var dots = [],
          width = 0,
          height = 0,
          cx = 0,
          cy = 0;
     
      function compensate() {
          
        var a = S.Drawing.getArea();
     
        cx = a.w / 2 - width / 2;
        cy = a.h / 2 - height / 2;
      }
     
      return {
          
        shuffleIdle: function () {
          
          var a = S.Drawing.getArea();
     
          for (var d = 0; d < dots.length; d++) {
          
            if (!dots[d].s) {
          
              dots[d].move({
          
                x: Math.random() * a.w,
                y: Math.random() * a.h
              });
            }
          }
        },
     
        switchShape: function (n, fast) {
          
          var size,
              a = S.Drawing.getArea();
     
          width = n.w;
          height = n.h;
     
          compensate();
     
          if (n.dots.length > dots.length) {
          
            size = n.dots.length - dots.length;
            for (var d = 1; d <= size; d++) {
          
              dots.push(new S.Dot(a.w / 2, a.h / 2));
            }
          }
     
          var d = 0,
              i = 0;
     
          while (n.dots.length > 0) {
          
            i = Math.floor(Math.random() * n.dots.length);
            dots[d].e = fast ? 0.25 : (dots[d].s ? 0.14 : 0.11);
     
            if (dots[d].s) {
          
              dots[d].move(new S.Point({
          
                z: Math.random() * 20 + 10,
                a: Math.random(),
                h: 18
              }));
            } else {
          
              dots[d].move(new S.Point({
          
                z: Math.random() * 5 + 5,
                h: fast ? 18 : 30
              }));
            }
     
            dots[d].s = true;
            dots[d].move(new S.Point({
          
              x: n.dots[i].x + cx,
              y: n.dots[i].y + cy,
              a: 1,
              z: 5,
              h: 0
            }));
     
            n.dots = n.dots.slice(0, i).concat(n.dots.slice(i + 1));
            d++;
          }
     
          for (var i = d; i < dots.length; i++) {
          
            if (dots[i].s) {
          
              dots[i].move(new S.Point({
          
                z: Math.random() * 20 + 10,
                a: Math.random(),
                h: 20
              }));
     
              dots[i].s = false;
              dots[i].e = 0.04;
              dots[i].move(new S.Point({
          
                x: Math.random() * a.w,
                y: Math.random() * a.h,
                a: 0.3, //.4
                z: Math.random() * 4,
                h: 0
              }));
            }
          }
        },
     
        render: function () {
          
          for (var d = 0; d < dots.length; d++) {
          
            dots[d].render();
          }
        }
      }
    }());
     
     
    S.init();
     
    </script>
     
    </body>
    </html>

[63a73c9d41384c13aa370500889239cc.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/30/fef129dcb30e4611aeee442b70fe41a3.png