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Web前端:html烟花代码

作者：weixin_40725706 | 2024-02-15 14:54:50

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Web前端:html烟花代码

代码如下:

  1. <!doctype html>
  2. <html>
  3. <head>
  4. <meta charset="utf-8">
  5. <title>fireworks烟花！</title>
  6.  
  7. <style>
  8. html,body{
  9. 	margin:0px;
  10. 	width:100%;
  11. 	height:100%;
  12. 	overflow:hidden;
  13. 	background:#000;
  14. }
  15. </style>
  16.  
  17. </head>
  18. <body>
  19. <canvas id="canvas" style="position:absolute;width:100%;height:100%;z-index:8888"></canvas>
  20. <canvas style="position:absolute;width:100%;height:100%;z-index:9999" class="canvas" ></canvas>
  21. <div class="overlay">
  22.   <div class="tabs">
  23.     <div class="tabs-labels"><span class="tabs-label">Commands</span><span class="tabs-label">Info</span><span class="tabs-label">Share</span></div>
  24.  
  25.     <div class="tabs-panels">
  26.       <ul class="tabs-panel commands">
  27.       </ul>
  28.     </div>
  29.   </div>
  30. </div>
  31. <script>
  32. function initVars(){
  33.  
  34. 	pi=Math.PI;
  35. 	ctx=canvas.getContext("2d");
  36. 	canvas.width=canvas.clientWidth;
  37. 	canvas.height=canvas.clientHeight;
  38. 	cx=canvas.width/2;
  39. 	cy=canvas.height/2;
  40. 	playerZ=-25;
  41. 	playerX=playerY=playerVX=playerVY=playerVZ=pitch=yaw=pitchV=yawV=0;
  42. 	scale=600;
  43. 	seedTimer=0;seedInterval=5,seedLife=100;gravity=.02;
  44. 	seeds=new Array();
  45. 	sparkPics=new Array();
  46. 	s="https://cantelope.org/NYE/";
  47. 	for(i=1;i<=10;++i){
  48. 		sparkPic=new Image();
  49. 		sparkPic.src=s+"spark"+i+".png";
  50. 		sparkPics.push(sparkPic);
  51. 	}
  52. 	sparks=new Array();
  53. 	pow1=new Audio(s+"pow1.ogg");
  54. 	pow2=new Audio(s+"pow2.ogg");
  55. 	pow3=new Audio(s+"pow3.ogg");
  56. 	pow4=new Audio(s+"pow4.ogg");
  57. 	frames = 0;
  58. }
  59.  
  60. function rasterizePoint(x,y,z){
  61.  
  62. 	var p,d;
  63. 	x-=playerX;
  64. 	y-=playerY;
  65. 	z-=playerZ;
  66. 	p=Math.atan2(x,z);
  67. 	d=Math.sqrt(x*x+z*z);
  68. 	x=Math.sin(p-yaw)*d;
  69. 	z=Math.cos(p-yaw)*d;
  70. 	p=Math.atan2(y,z);
  71. 	d=Math.sqrt(y*y+z*z);
  72. 	y=Math.sin(p-pitch)*d;
  73. 	z=Math.cos(p-pitch)*d;
  74. 	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);
  75. 	if(!uc) return {x:0,y:0,d:-1};
  76. 	var ua=((rx4-rx3)*(ry1-ry3)-(ry4-ry3)*(rx1-rx3))/uc;
  77. 	var ub=((rx2-rx1)*(ry1-ry3)-(ry2-ry1)*(rx1-rx3))/uc;
  78. 	if(!z)z=.000000001;
  79. 	if(ua>0&&ua<1&&ub>0&&ub<1){
  80. 		return {
  81. 			x:cx+(rx1+ua*(rx2-rx1))*scale,
  82. 			y:cy+y/z*scale,
  83. 			d:Math.sqrt(x*x+y*y+z*z)
  84. 		};
  85. 	}else{
  86. 		return {
  87. 			x:cx+(rx1+ua*(rx2-rx1))*scale,
  88. 			y:cy+y/z*scale,
  89. 			d:-1
  90. 		};
  91. 	}
  92. }
  93.  
  94. function spawnSeed(){
  95.  
  96. 	seed=new Object();
  97. 	seed.x=-50+Math.random()*100;
  98. 	seed.y=25;
  99. 	seed.z=-50+Math.random()*100;
  100. 	seed.vx=.1-Math.random()*.2;
  101. 	seed.vy=-1.5;//*(1+Math.random()/2);
  102. 	seed.vz=.1-Math.random()*.2;
  103. 	seed.born=frames;
  104. 	seeds.push(seed);
  105. }
  106.  
  107. function splode(x,y,z){
  108.  
  109. 	t=5+parseInt(Math.random()*150);
  110. 	sparkV=1+Math.random()*2.5;
  111. 	type=parseInt(Math.random()*3);
  112. 	switch(type){
  113. 		case 0:
  114. 			pic1=parseInt(Math.random()*10);
  115. 			break;
  116. 		case 1:
  117. 			pic1=parseInt(Math.random()*10);
  118. 			do{ pic2=parseInt(Math.random()*10); }while(pic2==pic1);
  119. 			break;
  120. 		case 2:
  121. 			pic1=parseInt(Math.random()*10);
  122. 			do{ pic2=parseInt(Math.random()*10); }while(pic2==pic1);
  123. 			do{ pic3=parseInt(Math.random()*10); }while(pic3==pic1 || pic3==pic2);
  124. 			break;
  125. 	}
  126. 	for(m=1;m<t;++m){
  127. 		spark=new Object();
  128. 		spark.x=x; spark.y=y; spark.z=z;
  129. 		p1=pi*2*Math.random();
  130. 		p2=pi*Math.random();
  131. 		v=sparkV*(1+Math.random()/6)
  132. 		spark.vx=Math.sin(p1)*Math.sin(p2)*v;
  133. 		spark.vz=Math.cos(p1)*Math.sin(p2)*v;
  134. 		spark.vy=Math.cos(p2)*v;
  135. 		switch(type){
  136. 			case 0: spark.img=sparkPics[pic1]; break;
  137. 			case 1:
  138. 				spark.img=sparkPics[parseInt(Math.random()*2)?pic1:pic2];
  139. 				break;
  140. 			case 2:
  141. 				switch(parseInt(Math.random()*3)){
  142. 					case 0: spark.img=sparkPics[pic1]; break;
  143. 					case 1: spark.img=sparkPics[pic2]; break;
  144. 					case 2: spark.img=sparkPics[pic3]; break;
  145. 				}
  146. 				break;
  147. 		}
  148. 		spark.radius=25+Math.random()*50;
  149. 		spark.alpha=1;
  150. 		spark.trail=new Array();
  151. 		sparks.push(spark);
  152. 	}
  153. 	switch(parseInt(Math.random()*4)){
  154. 		case 0:	pow=new Audio(s+"pow1.ogg"); break;
  155. 		case 1:	pow=new Audio(s+"pow2.ogg"); break;
  156. 		case 2:	pow=new Audio(s+"pow3.ogg"); break;
  157. 		case 3:	pow=new Audio(s+"pow4.ogg"); break;
  158. 	}
  159. 	d=Math.sqrt((x-playerX)*(x-playerX)+(y-playerY)*(y-playerY)+(z-playerZ)*(z-playerZ));
  160. 	pow.volume=1.5/(1+d/10);
  161. 	pow.play();
  162. }
  163.  
  164. function doLogic(){
  165.  
  166. 	if(seedTimer<frames){
  167. 		seedTimer=frames+seedInterval*Math.random()*10;
  168. 		spawnSeed();
  169. 	}
  170. 	for(i=0;i<seeds.length;++i){
  171. 		seeds[i].vy+=gravity;
  172. 		seeds[i].x+=seeds[i].vx;
  173. 		seeds[i].y+=seeds[i].vy;
  174. 		seeds[i].z+=seeds[i].vz;
  175. 		if(frames-seeds[i].born>seedLife){
  176. 			splode(seeds[i].x,seeds[i].y,seeds[i].z);
  177. 			seeds.splice(i,1);
  178. 		}
  179. 	}
  180. 	for(i=0;i<sparks.length;++i){
  181. 		if(sparks[i].alpha>0 && sparks[i].radius>5){
  182. 			sparks[i].alpha-=.01;
  183. 			sparks[i].radius/=1.02;
  184. 			sparks[i].vy+=gravity;
  185. 			point=new Object();
  186. 			point.x=sparks[i].x;
  187. 			point.y=sparks[i].y;
  188. 			point.z=sparks[i].z;
  189. 			if(sparks[i].trail.length){
  190. 				x=sparks[i].trail[sparks[i].trail.length-1].x;
  191. 				y=sparks[i].trail[sparks[i].trail.length-1].y;
  192. 				z=sparks[i].trail[sparks[i].trail.length-1].z;
  193. 				d=((point.x-x)*(point.x-x)+(point.y-y)*(point.y-y)+(point.z-z)*(point.z-z));
  194. 				if(d>9){
  195. 					sparks[i].trail.push(point);
  196. 				}
  197. 			}else{
  198. 				sparks[i].trail.push(point);
  199. 			}
  200. 			if(sparks[i].trail.length>5)sparks[i].trail.splice(0,1);
  201. 			sparks[i].x+=sparks[i].vx;
  202. 			sparks[i].y+=sparks[i].vy;
  203. 			sparks[i].z+=sparks[i].vz;
  204. 			sparks[i].vx/=1.075;
  205. 			sparks[i].vy/=1.075;
  206. 			sparks[i].vz/=1.075;
  207. 		}else{
  208. 			sparks.splice(i,1);
  209. 		}
  210. 	}
  211. 	p=Math.atan2(playerX,playerZ);
  212. 	d=Math.sqrt(playerX*playerX+playerZ*playerZ);
  213. 	d+=Math.sin(frames/80)/1.25;
  214. 	t=Math.sin(frames/200)/40;
  215. 	playerX=Math.sin(p+t)*d;
  216. 	playerZ=Math.cos(p+t)*d;
  217. 	yaw=pi+p+t;
  218. }
  219.  
  220. function rgb(col){
  221.  
  222. 	var r = parseInt((.5+Math.sin(col)*.5)*16);
  223. 	var g = parseInt((.5+Math.cos(col)*.5)*16);
  224. 	var b = parseInt((.5-Math.sin(col)*.5)*16);
  225. 	return "#"+r.toString(16)+g.toString(16)+b.toString(16);
  226. }
  227.  
  228. function draw(){
  229.  
  230. 	ctx.clearRect(0,0,cx*2,cy*2);
  231.  
  232. 	ctx.fillStyle="#ff8";
  233. 	for(i=-100;i<100;i+=3){
  234. 		for(j=-100;j<100;j+=4){
  235. 			x=i;z=j;y=25;
  236. 			point=rasterizePoint(x,y,z);
  237. 			if(point.d!=-1){
  238. 				size=250/(1+point.d);
  239. 				d = Math.sqrt(x * x + z * z);
  240. 				a = 0.75 - Math.pow(d / 100, 6) * 0.75;
  241. 				if(a>0){
  242. 					ctx.globalAlpha = a;
  243. 					ctx.fillRect(point.x-size/2,point.y-size/2,size,size);
  244. 				}
  245. 			}
  246. 		}
  247. 	}
  248. 	ctx.globalAlpha=1;
  249. 	for(i=0;i<seeds.length;++i){
  250. 		point=rasterizePoint(seeds[i].x,seeds[i].y,seeds[i].z);
  251. 		if(point.d!=-1){
  252. 			size=200/(1+point.d);
  253. 			ctx.fillRect(point.x-size/2,point.y-size/2,size,size);
  254. 		}
  255. 	}
  256. 	point1=new Object();
  257. 	for(i=0;i<sparks.length;++i){
  258. 		point=rasterizePoint(sparks[i].x,sparks[i].y,sparks[i].z);
  259. 		if(point.d!=-1){
  260. 			size=sparks[i].radius*200/(1+point.d);
  261. 			if(sparks[i].alpha<0)sparks[i].alpha=0;
  262. 			if(sparks[i].trail.length){
  263. 				point1.x=point.x;
  264. 				point1.y=point.y;
  265. 				switch(sparks[i].img){
  266. 					case sparkPics[0]:ctx.strokeStyle="#f84";break;
  267. 					case sparkPics[1]:ctx.strokeStyle="#84f";break;
  268. 					case sparkPics[2]:ctx.strokeStyle="#8ff";break;
  269. 					case sparkPics[3]:ctx.strokeStyle="#fff";break;
  270. 					case sparkPics[4]:ctx.strokeStyle="#4f8";break;
  271. 					case sparkPics[5]:ctx.strokeStyle="#f44";break;
  272. 					case sparkPics[6]:ctx.strokeStyle="#f84";break;
  273. 					case sparkPics[7]:ctx.strokeStyle="#84f";break;
  274. 					case sparkPics[8]:ctx.strokeStyle="#fff";break;
  275. 					case sparkPics[9]:ctx.strokeStyle="#44f";break;
  276. 				}
  277. 				for(j=sparks[i].trail.length-1;j>=0;--j){
  278. 					point2=rasterizePoint(sparks[i].trail[j].x,sparks[i].trail[j].y,sparks[i].trail[j].z);
  279. 					if(point2.d!=-1){
  280. 						ctx.globalAlpha=j/sparks[i].trail.length*sparks[i].alpha/2;
  281. 						ctx.beginPath();
  282. 						ctx.moveTo(point1.x,point1.y);
  283. 						ctx.lineWidth=1+sparks[i].radius*10/(sparks[i].trail.length-j)/(1+point2.d);
  284. 						ctx.lineTo(point2.x,point2.y);
  285. 						ctx.stroke();
  286. 						point1.x=point2.x;
  287. 						point1.y=point2.y;
  288. 					}
  289. 				}
  290. 			}
  291. 			ctx.globalAlpha=sparks[i].alpha;
  292. 			ctx.drawImage(sparks[i].img,point.x-size/2,point.y-size/2,size,size);
  293. 		}
  294. 	}
  295. }
  296.  
  297. function frame(){
  298.  
  299. 	if(frames>100000){
  300. 		seedTimer=0;
  301. 		frames=0;
  302. 	}
  303. 	frames++;
  304. 	draw();
  305. 	doLogic();
  306. 	requestAnimationFrame(frame);
  307. }
  308.  
  309. window.addEventListener("resize",()=>{
  310. 	canvas.width=canvas.clientWidth;
  311. 	canvas.height=canvas.clientHeight;
  312. 	cx=canvas.width/2;
  313. 	cy=canvas.height/2;
  314. });
  315.  
  316. initVars();
  317. frame();
  318. </script>
  319. <script>
  320. 	
  321. var S = {
  322.   init: function () {
  323.     var action = window.location.href,
  324.         i = action.indexOf('?a=');
  325.  
  326.     S.Drawing.init('.canvas');
  327.     document.body.classList.add('body--ready');
  328.  
  329.     if (i !== -1) {
  330.       S.UI.simulate(decodeURI(action).substring(i + 3));
  331.     } else {
  332.       S.UI.simulate('|#countdown 3||祝|X|X|X|学|业|顺|利|所得皆所愿|所想皆如意！|#rectangle|');
  333.     }
  334.  
  335.     S.Drawing.loop(function () {
  336.       S.Shape.render();
  337.     });
  338.   }
  339. };
  340.  
  341.  
  342. S.Drawing = (function () {
  343.   var canvas,
  344.       context,
  345.       renderFn
  346.       requestFrame = window.requestAnimationFrame       ||
  347.                      window.webkitRequestAnimationFrame ||
  348.                      window.mozRequestAnimationFrame    ||
  349.                      window.oRequestAnimationFrame      ||
  350.                      window.msRequestAnimationFrame     ||
  351.                      function(callback) {
  352.                        window.setTimeout(callback, 1000 / 60);
  353.                      };
  354.  
  355.   return {
  356.     init: function (el) {
  357.       canvas = document.querySelector(el);
  358.       context = canvas.getContext('2d');
  359.       this.adjustCanvas();
  360.  
  361.       window.addEventListener('resize', function (e) {
  362.         S.Drawing.adjustCanvas();
  363.       });
  364.     },
  365.  
  366.     loop: function (fn) {
  367.       renderFn = !renderFn ? fn : renderFn;
  368.       this.clearFrame();
  369.       renderFn();
  370.       requestFrame.call(window, this.loop.bind(this));
  371.     },
  372.  
  373.     adjustCanvas: function () {
  374.       canvas.width = window.innerWidth;
  375.       canvas.height = window.innerHeight;
  376.     },
  377.  
  378.     clearFrame: function () {
  379.       context.clearRect(0, 0, canvas.width, canvas.height);
  380.     },
  381.  
  382.     getArea: function () {
  383.       return { w: canvas.width, h: canvas.height };
  384.     },
  385.  
  386.     drawCircle: function (p, c) {
  387.       context.fillStyle = c.render();
  388.       context.beginPath();
  389.       context.arc(p.x, p.y, p.z, 0, 2 * Math.PI, true);
  390.       context.closePath();
  391.       context.fill();
  392.     }
  393.   }
  394. }());
  395.  
  396.  
  397. S.UI = (function () {
  398.   var canvas = document.querySelector('.canvas'),
  399.       interval,
  400.       isTouch = false, //('ontouchstart' in window || navigator.msMaxTouchPoints),
  401.       currentAction,
  402.       resizeTimer,
  403.       time,
  404.       maxShapeSize = 30,
  405.       firstAction = true,
  406.       sequence = [],
  407.       cmd = '#';
  408.  
  409.   function formatTime(date) {
  410.     var h = date.getHours(),
  411.         m = date.getMinutes(),
  412.     m = m < 10 ? '0' + m : m;
  413.     return h + ':' + m;
  414.   }
  415.  
  416.   function getValue(value) {
  417.     return value && value.split(' ')[1];
  418.   }
  419.  
  420.   function getAction(value) {
  421.     value = value && value.split(' ')[0];
  422.     return value && value[0] === cmd && value.substring(1);
  423.   }
  424.  
  425.   function timedAction(fn, delay, max, reverse) {
  426.     clearInterval(interval);
  427.     currentAction = reverse ? max : 1;
  428.     fn(currentAction);
  429.  
  430.     if (!max || (!reverse && currentAction < max) || (reverse && currentAction > 0)) {
  431.       interval = setInterval(function () {
  432.         currentAction = reverse ? currentAction - 1 : currentAction + 1;
  433.         fn(currentAction);
  434.  
  435.         if ((!reverse && max && currentAction === max) || (reverse && currentAction === 0)) {
  436.           clearInterval(interval);
  437.         }
  438.       }, delay);
  439.     }
  440.   }
  441.  
  442.   function reset(destroy) {
  443.     clearInterval(interval);
  444.     sequence = [];
  445.     time = null;
  446.     destroy && S.Shape.switchShape(S.ShapeBuilder.letter(''));
  447.   }
  448.  
  449.   function performAction(value) {
  450.     var action,
  451.         value,
  452.         current;
  453.  
  454.     // overlay.classList.remove('overlay--visible');
  455.     sequence = typeof(value) === 'object' ? value : sequence.concat(value.split('|'));
  456.     // input.value = '';
  457.     // checkInputWidth();
  458.  
  459.     timedAction(function (index) {
  460.       current = sequence.shift();
  461.       action = getAction(current);
  462.       value = getValue(current);
  463.  
  464.       switch (action) {
  465.         case 'countdown':
  466.           value = parseInt(value) || 10;
  467.           value = value > 0 ? value : 10;
  468.  
  469.           timedAction(function (index) {
  470.             if (index === 0) {
  471.               if (sequence.length === 0) {
  472.                 S.Shape.switchShape(S.ShapeBuilder.letter(''));
  473.               } else {
  474.                 performAction(sequence);
  475.               }
  476.             } else {
  477.               S.Shape.switchShape(S.ShapeBuilder.letter(index), true);
  478.             }
  479.           }, 1000, value, true);
  480.           break;
  481.  
  482.         case 'rectangle':
  483.           value = value && value.split('x');
  484.           value = (value && value.length === 2) ? value : [maxShapeSize, maxShapeSize / 2];
  485.  
  486.           S.Shape.switchShape(S.ShapeBuilder.rectangle(Math.min(maxShapeSize, parseInt(value[0])), Math.min(maxShapeSize, parseInt(value[1]))));
  487.           break;
  488.  
  489.         case 'circle':
  490.           value = parseInt(value) || maxShapeSize;
  491.           value = Math.min(value, maxShapeSize);
  492.           S.Shape.switchShape(S.ShapeBuilder.circle(value));
  493.           break;
  494.  
  495.         case 'time':
  496.           var t = formatTime(new Date());
  497.  
  498.           if (sequence.length > 0) {
  499.             S.Shape.switchShape(S.ShapeBuilder.letter(t));
  500.           } else {
  501.             timedAction(function () {
  502.               t = formatTime(new Date());
  503.               if (t !== time) {
  504.                 time = t;
  505.                 S.Shape.switchShape(S.ShapeBuilder.letter(time));
  506.               }
  507.             }, 1000);
  508.           }
  509.           break;
  510.  
  511.         default:
  512.           S.Shape.switchShape(S.ShapeBuilder.letter(current[0] === cmd ? 'What?' : current));
  513.       }
  514.     }, 2000, sequence.length);
  515.   }
  516.  
  517.   function checkInputWidth(e) {
  518.     if (input.value.length > 18) {
  519.       ui.classList.add('ui--wide');
  520.     } else {
  521.       ui.classList.remove('ui--wide');
  522.     }
  523.  
  524.     if (firstAction && input.value.length > 0) {
  525.       ui.classList.add('ui--enter');
  526.     } else {
  527.       ui.classList.remove('ui--enter');
  528.     }
  529.   }
  530.  
  531.   function bindEvents() {
  532.     document.body.addEventListener('keydown', function (e) {
  533.       input.focus();
  534.  
  535.       if (e.keyCode === 13) {
  536.         firstAction = false;
  537.         reset();
  538.         performAction(input.value);
  539.       }
  540.     });
  541.  
  542.     canvas.addEventListener('click', function (e) {
  543.       overlay.classList.remove('overlay--visible');
  544.     });
  545.   }
  546.  
  547.   function init() {
  548.     bindEvents();
  549.     // input.focus();
  550.     isTouch && document.body.classList.add('touch');
  551.   }
  552.  
  553.   // Init
  554.   init();
  555.  
  556.   return {
  557.     simulate: function (action) {
  558.       performAction(action);
  559.     }
  560.   }
  561. }());
  562.  
  563.  
  564. S.UI.Tabs = (function () {
  565.   var tabs = document.querySelector('.tabs'),
  566.       labels = document.querySelector('.tabs-labels'),
  567.       triggers = document.querySelectorAll('.tabs-label'),
  568.       panels = document.querySelectorAll('.tabs-panel');
  569.  
  570.   function activate(i) {
  571.     triggers[i].classList.add('tabs-label--active');
  572.     panels[i].classList.add('tabs-panel--active');
  573.   }
  574.  
  575.   function bindEvents() {
  576.     labels.addEventListener('click', function (e) {
  577.       var el = e.target,
  578.           index;
  579.  
  580.       if (el.classList.contains('tabs-label')) {
  581.         for (var t = 0; t < triggers.length; t++) {
  582.           triggers[t].classList.remove('tabs-label--active');
  583.           panels[t].classList.remove('tabs-panel--active');
  584.  
  585.           if (el === triggers[t]) {
  586.             index = t;
  587.           }
  588.         }
  589.  
  590.         activate(index);
  591.       }
  592.     });
  593.   }
  594.  
  595.   function init() {
  596.     activate(0);
  597.     bindEvents();
  598.   }
  599.  
  600.   // Init
  601.   init();
  602. }());
  603.  
  604.  
  605. S.Point = function (args) {
  606.   this.x = args.x;
  607.   this.y = args.y;
  608.   this.z = args.z;
  609.   this.a = args.a;
  610.   this.h = args.h;
  611. };
  612.  
  613.  
  614. S.Color = function (r, g, b, a) {
  615.   this.r = r;
  616.   this.g = g;
  617.   this.b = b;
  618.   this.a = a;
  619. };
  620.  
  621. S.Color.prototype = {
  622.   render: function () {
  623.     return 'rgba(' + this.r + ',' +  + this.g + ',' + this.b + ',' + this.a + ')';
  624.   }
  625. };
  626.  
  627.  
  628. S.Dot = function (x, y) {
  629.   this.p = new S.Point({
  630.     x: x,
  631.     y: y,
  632.     z: 5,
  633.     a: 1,
  634.     h: 0
  635.   });
  636.  
  637.   this.e = 0.07;
  638.   this.s = true;
  639.  
  640.   this.c = new S.Color(255, 255, 255, this.p.a);
  641.  
  642.   this.t = this.clone();
  643.   this.q = [];
  644. };
  645.  
  646. S.Dot.prototype = {
  647.   clone: function () {
  648.     return new S.Point({
  649.       x: this.x,
  650.       y: this.y,
  651.       z: this.z,
  652.       a: this.a,
  653.       h: this.h
  654.     });
  655.   },
  656.  
  657.   _draw: function () {
  658.     this.c.a = this.p.a;
  659.     S.Drawing.drawCircle(this.p, this.c);
  660.   },
  661.  
  662.   _moveTowards: function (n) {
  663.     var details = this.distanceTo(n, true),
  664.         dx = details[0],
  665.         dy = details[1],
  666.         d = details[2],
  667.         e = this.e * d;
  668.  
  669.     if (this.p.h === -1) {
  670.       this.p.x = n.x;
  671.       this.p.y = n.y;
  672.       return true;
  673.     }
  674.  
  675.     if (d > 1) {
  676.       this.p.x -= ((dx / d) * e);
  677.       this.p.y -= ((dy / d) * e);
  678.     } else {
  679.       if (this.p.h > 0) {
  680.         this.p.h--;
  681.       } else {
  682.         return true;
  683.       }
  684.     }
  685.  
  686.     return false;
  687.   },
  688.  
  689.   _update: function () {
  690.     if (this._moveTowards(this.t)) {
  691.       var p = this.q.shift();
  692.  
  693.       if (p) {
  694.         this.t.x = p.x || this.p.x;
  695.         this.t.y = p.y || this.p.y;
  696.         this.t.z = p.z || this.p.z;
  697.         this.t.a = p.a || this.p.a;
  698.         this.p.h = p.h || 0;
  699.       } else {
  700.         if (this.s) {
  701.           this.p.x -= Math.sin(Math.random() * 3.142);
  702.           this.p.y -= Math.sin(Math.random() * 3.142);
  703.         } else {
  704.           this.move(new S.Point({
  705.             x: this.p.x + (Math.random() * 50) - 25,
  706.             y: this.p.y + (Math.random() * 50) - 25,
  707.           }));
  708.         }
  709.       }
  710.     }
  711.  
  712.     d = this.p.a - this.t.a;
  713.     this.p.a = Math.max(0.1, this.p.a - (d * 0.05));
  714.     d = this.p.z - this.t.z;
  715.     this.p.z = Math.max(1, this.p.z - (d * 0.05));
  716.   },
  717.  
  718.   distanceTo: function (n, details) {
  719.     var dx = this.p.x - n.x,
  720.         dy = this.p.y - n.y,
  721.         d = Math.sqrt(dx * dx + dy * dy);
  722.  
  723.     return details ? [dx, dy, d] : d;
  724.   },
  725.  
  726.   move: function (p, avoidStatic) {
  727.     if (!avoidStatic || (avoidStatic && this.distanceTo(p) > 1)) {
  728.       this.q.push(p);
  729.     }
  730.   },
  731.  
  732.   render: function () {
  733.     this._update();
  734.     this._draw();
  735.   }
  736. }
  737.  
  738.  
  739. S.ShapeBuilder = (function () {
  740.   var gap = 13,
  741.       shapeCanvas = document.createElement('canvas'),
  742.       shapeContext = shapeCanvas.getContext('2d'),
  743.       fontSize = 500,
  744.       fontFamily = 'Avenir, Helvetica Neue, Helvetica, Arial, sans-serif';
  745.  
  746.   function fit() {
  747.     shapeCanvas.width = Math.floor(window.innerWidth / gap) * gap;
  748.     shapeCanvas.height = Math.floor(window.innerHeight / gap) * gap;
  749.     shapeContext.fillStyle = 'red';
  750.     shapeContext.textBaseline = 'middle';
  751.     shapeContext.textAlign = 'center';
  752.   }
  753.  
  754.   function processCanvas() {
  755.     var pixels = shapeContext.getImageData(0, 0, shapeCanvas.width, shapeCanvas.height).data;
  756.         dots = [],
  757.         pixels,
  758.         x = 0,
  759.         y = 0,
  760.         fx = shapeCanvas.width,
  761.         fy = shapeCanvas.height,
  762.         w = 0,
  763.         h = 0;
  764.  
  765.     for (var p = 0; p < pixels.length; p += (4 * gap)) {
  766.       if (pixels[p + 3] > 0) {
  767.         dots.push(new S.Point({
  768.           x: x,
  769.           y: y
  770.         }));
  771.  
  772.         w = x > w ? x : w;
  773.         h = y > h ? y : h;
  774.         fx = x < fx ? x : fx;
  775.         fy = y < fy ? y : fy;
  776.       }
  777.  
  778.       x += gap;
  779.  
  780.       if (x >= shapeCanvas.width) {
  781.         x = 0;
  782.         y += gap;
  783.         p += gap * 4 * shapeCanvas.width;
  784.       }
  785.     }
  786.  
  787.     return { dots: dots, w: w + fx, h: h + fy };
  788.   }
  789.  
  790.   function setFontSize(s) {
  791.     shapeContext.font = 'bold ' + s + 'px ' + fontFamily;
  792.   }
  793.  
  794.   function isNumber(n) {
  795.     return !isNaN(parseFloat(n)) && isFinite(n);
  796.   }
  797.  
  798.   function init() {
  799.     fit();
  800.     window.addEventListener('resize', fit);
  801.   }
  802.  
  803.   // Init
  804.   init();
  805.  
  806.   return {
  807.     imageFile: function (url, callback) {
  808.       var image = new Image(),
  809.           a = S.Drawing.getArea();
  810.  
  811.       image.onload = function () {
  812.         shapeContext.clearRect(0, 0, shapeCanvas.width, shapeCanvas.height);
  813.         shapeContext.drawImage(this, 0, 0, a.h * 0.6, a.h * 0.6);
  814.         callback(processCanvas());
  815.       };
  816.  
  817.       image.onerror = function () {
  818.         callback(S.ShapeBuilder.letter('What?'));
  819.       }
  820.  
  821.       image.src = url;
  822.     },
  823.  
  824.     circle: function (d) {
  825.       var r = Math.max(0, d) / 2;
  826.       shapeContext.clearRect(0, 0, shapeCanvas.width, shapeCanvas.height);
  827.       shapeContext.beginPath();
  828.       shapeContext.arc(r * gap, r * gap, r * gap, 0, 2 * Math.PI, false);
  829.       shapeContext.fill();
  830.       shapeContext.closePath();
  831.  
  832.       return processCanvas();
  833.     },
  834.  
  835.     letter: function (l) {
  836.       var s = 0;
  837.  
  838.       setFontSize(fontSize);
  839.       s = Math.min(fontSize,
  840.                   (shapeCanvas.width / shapeContext.measureText(l).width) * 0.8 * fontSize,
  841.                   (shapeCanvas.height / fontSize) * (isNumber(l) ? 1 : 0.45) * fontSize);
  842.       setFontSize(s);
  843.  
  844.       shapeContext.clearRect(0, 0, shapeCanvas.width, shapeCanvas.height);
  845.       shapeContext.fillText(l, shapeCanvas.width / 2, shapeCanvas.height / 2);
  846.  
  847.       return processCanvas();
  848.     },
  849.  
  850.     rectangle: function (w, h) {
  851.       var dots = [],
  852.           width = gap * w,
  853.           height = gap * h;
  854.  
  855.       for (var y = 0; y < height; y += gap) {
  856.         for (var x = 0; x < width; x += gap) {
  857.           dots.push(new S.Point({
  858.             x: x,
  859.             y: y,
  860.           }));
  861.         }
  862.       }
  863.  
  864.       return { dots: dots, w: width, h: height };
  865.     }
  866.   };
  867. }());
  868.  
  869.  
  870. S.Shape = (function () {
  871.   var dots = [],
  872.       width = 0,
  873.       height = 0,
  874.       cx = 0,
  875.       cy = 0;
  876.  
  877.   function compensate() {
  878.     var a = S.Drawing.getArea();
  879.  
  880.     cx = a.w / 2 - width / 2;
  881.     cy = a.h / 2 - height / 2;
  882.   }
  883.  
  884.   return {
  885.     shuffleIdle: function () {
  886.       var a = S.Drawing.getArea();
  887.  
  888.       for (var d = 0; d < dots.length; d++) {
  889.         if (!dots[d].s) {
  890.           dots[d].move({
  891.             x: Math.random() * a.w,
  892.             y: Math.random() * a.h
  893.           });
  894.         }
  895.       }
  896.     },
  897.  
  898.     switchShape: function (n, fast) {
  899.       var size,
  900.           a = S.Drawing.getArea();
  901.  
  902.       width = n.w;
  903.       height = n.h;
  904.  
  905.       compensate();
  906.  
  907.       if (n.dots.length > dots.length) {
  908.         size = n.dots.length - dots.length;
  909.         for (var d = 1; d <= size; d++) {
  910.           dots.push(new S.Dot(a.w / 2, a.h / 2));
  911.         }
  912.       }
  913.  
  914.       var d = 0,
  915.           i = 0;
  916.  
  917.       while (n.dots.length > 0) {
  918.         i = Math.floor(Math.random() * n.dots.length);
  919.         dots[d].e = fast ? 0.25 : (dots[d].s ? 0.14 : 0.11);
  920.  
  921.         if (dots[d].s) {
  922.           dots[d].move(new S.Point({
  923.             z: Math.random() * 20 + 10,
  924.             a: Math.random(),
  925.             h: 18
  926.           }));
  927.         } else {
  928.           dots[d].move(new S.Point({
  929.             z: Math.random() * 5 + 5,
  930.             h: fast ? 18 : 30
  931.           }));
  932.         }
  933.  
  934.         dots[d].s = true;
  935.         dots[d].move(new S.Point({
  936.           x: n.dots[i].x + cx,
  937.           y: n.dots[i].y + cy,
  938.           a: 1,
  939.           z: 5,
  940.           h: 0
  941.         }));
  942.  
  943.         n.dots = n.dots.slice(0, i).concat(n.dots.slice(i + 1));
  944.         d++;
  945.       }
  946.  
  947.       for (var i = d; i < dots.length; i++) {
  948.         if (dots[i].s) {
  949.           dots[i].move(new S.Point({
  950.             z: Math.random() * 20 + 10,
  951.             a: Math.random(),
  952.             h: 20
  953.           }));
  954.  
  955.           dots[i].s = false;
  956.           dots[i].e = 0.04;
  957.           dots[i].move(new S.Point({
  958.             x: Math.random() * a.w,
  959.             y: Math.random() * a.h,
  960.             a: 0.3, //.4
  961.             z: Math.random() * 4,
  962.             h: 0
  963.           }));
  964.         }
  965.       }
  966.     },
  967.  
  968.     render: function () {
  969.       for (var d = 0; d < dots.length; d++) {
  970.         dots[d].render();
  971.       }
  972.     }
  973.   }
  974. }());
  975.  
  976.  
  977. S.init();
  978.  
  979. </script>
  980.  
  981. </body>
  982. </html>

该代码内含文字,文字内容可自由发挥,找到代码中这一行,修改内容即可

 S.UI.simulate('|#countdown 3||祝|X|X|X|学|业|顺|利|所得皆所愿|所想皆如意！|#rectangle|');

运行结果如下:

 

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