前言

首先，祝福各位彦祖们，2022快乐，如果没有对象，今年必定脱单！在封宿之余，我做了个跨年烟花来给自己过个年，和彦祖们分享一下，大家先来看一下效果图。

代码

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en"><head><meta http-equiv="Content-Type" content="text/html;charset=UTF-8"><style>body {margin: 0;padding: 0;overflow: hidden;}.city {width: 100%;position: fixed;bottom: 0px;z-index: 100;}.city img {width: 100%;}</style><title>放烟花</title>
</head><body onselectstart="return false"><canvas id='cas' style="background-color:rgba(0,5,24,1)">浏览器不支持canvas</canvas><div class="city"><img src="city.png" alt="" /></div><img src="moon.png" alt="" id="moon" style="visibility: hidden;" /><div style="display:none"><div class="shape">跨年快乐</div><div class="shape">我与旧事归于尽</div><div class="shape">我与旧事归于尽</div><div class="shape">来年依旧林花开</div><div class="shape"></div>来年依旧林花开</div></div><script>var canvas = document.getElementById("cas");var ocas = document.createElement("canvas");var octx = ocas.getContext("2d");var ctx = canvas.getContext("2d");ocas.width = canvas.width = window.innerWidth;ocas.height = canvas.height = window.innerHeight;var bigbooms = [];window.onload = function() {initAnimate()}function initAnimate() {drawBg();lastTime = new Date();animate();}var lastTime;function animate() {ctx.save();ctx.fillStyle = "rgba(0,5,24,0.1)";ctx.fillRect(0, 0, canvas.width, canvas.height);ctx.restore();var newTime = new Date();if (newTime - lastTime > 500 + (window.innerHeight - 767) / 2) {var random = Math.random() * 100 > 2 ? true : false;var x = getRandom(canvas.width / 5, canvas.width * 4 / 5);var y = getRandom(50, 200);if (random) {var bigboom = new Boom(getRandom(canvas.width / 3, canvas.width * 2 / 3), 2, "#FFF", {x: x,y: y});bigbooms.push(bigboom)} else {var bigboom = new Boom(getRandom(canvas.width / 3, canvas.width * 2 / 3), 2, "#FFF", {x: canvas.width / 2,y: 200}, document.querySelectorAll(".shape")[parseInt(getRandom(0, document.querySelectorAll(".shape").length))]);bigbooms.push(bigboom)}lastTime = newTime;console.log(bigbooms)}stars.foreach(function() {this.paint();})drawMoon();bigbooms.foreach(function(index) {var that = this;if (!this.dead) {this._move();this._drawLight();} else {this.booms.foreach(function(index) {if (!this.dead) {this.moveTo(index);} else if (index === that.booms.length - 1) {bigbooms[bigbooms.indexOf(that)] = null;}})}});raf(animate);}function drawMoon() {var moon = document.getElementById("moon");var centerX = canvas.width - 200,centerY = 100,width = 80;if (moon.complete) {ctx.drawImage(moon, centerX, centerY, width, width)} else {moon.onload = function() {ctx.drawImage(moon, centerX, centerY, width, width)}}var index = 0;for (var i = 0; i < 10; i++) {ctx.save();ctx.beginPath();ctx.arc(centerX + width / 2, centerY + width / 2, width / 2 + index, 0, 2 * Math.PI);ctx.fillStyle = "rgba(240,219,120,0.005)";index += 2;ctx.fill();ctx.restore();}}Array.prototype.foreach = function(callback) {for (var i = 0; i < this.length; i++) {if (this[i] !== null) callback.apply(this[i], [i])}}var raf = window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.oRequestAnimationFrame || window.msRequestAnimationFrame || function(callback) {window.setTimeout(callback, 1000 / 60);};canvas.onclick = function() {var x = event.clientX;var y = event.clientY;var bigboom = new Boom(getRandom(canvas.width / 3, canvas.width * 2 / 3), 2, "#FFF", {x: x,y: y});bigbooms.push(bigboom)}// canvas.addEventLisener("touchstart" , function(event){//   var touch = event.targetTouches[0];//  var x = event.pageX;//     var y = event.pageY;//     var bigboom = new Boom(getRandom(canvas.width/3,canvas.width*2/3) ,2,"#FFF" , {x:x , y:y});//    bigbooms.push(bigboom)// })var Boom = function(x, r, c, boomArea, shape) {this.booms = [];this.x = x;this.y = (canvas.height + r);this.r = r;this.c = c;this.shape = shape || false;this.boomArea = boomArea;this.theta = 0;this.dead = false;this.ba = parseInt(getRandom(80, 200));}Boom.prototype = {_paint: function() {ctx.save();ctx.beginPath();ctx.arc(this.x, this.y, this.r, 0, 2 * Math.PI);ctx.fillStyle = this.c;ctx.fill();ctx.restore();},_move: function() {var dx = this.boomArea.x - this.x,dy = this.boomArea.y - this.y;this.x = this.x + dx * 0.01;this.y = this.y + dy * 0.01;if (Math.abs(dx) <= this.ba && Math.abs(dy) <= this.ba) {if (this.shape) {this._shapBoom();} else this._boom();this.dead = true;} else {this._paint();}},_drawLight: function() {ctx.save();ctx.fillStyle = "rgba(255,228,150,0.3)";ctx.beginPath();ctx.arc(this.x, this.y, this.r + 3 * Math.random() + 1, 0, 2 * Math.PI);ctx.fill();ctx.restore();},_boom: function() {var fragNum = getRandom(30, 200);var style = getRandom(0, 10) >= 5 ? 1 : 2;var color;if (style === 1) {color = {a: parseInt(getRandom(128, 255)),b: parseInt(getRandom(128, 255)),c: parseInt(getRandom(128, 255))}}var fanwei = parseInt(getRandom(300, 400));for (var i = 0; i < fragNum; i++) {if (style === 2) {color = {a: parseInt(getRandom(128, 255)),b: parseInt(getRandom(128, 255)),c: parseInt(getRandom(128, 255))}}var a = getRandom(-Math.PI, Math.PI);var x = getRandom(0, fanwei) * Math.cos(a) + this.x;var y = getRandom(0, fanwei) * Math.sin(a) + this.y;var radius = getRandom(0, 2)var frag = new Frag(this.x, this.y, radius, color, x, y);this.booms.push(frag);}},_shapBoom: function() {var that = this;putValue(ocas, octx, this.shape, 5, function(dots) {var dx = canvas.width / 2 - that.x;var dy = canvas.height / 2 - that.y;for (var i = 0; i < dots.length; i++) {color = {a: dots[i].a,b: dots[i].b,c: dots[i].c}var x = dots[i].x;var y = dots[i].y;var radius = 1;var frag = new Frag(that.x, that.y, radius, color, x - dx, y - dy);that.booms.push(frag);}})}}function putValue(canvas, context, ele, dr, callback) {context.clearRect(0, 0, canvas.width, canvas.height);var img = new Image();if (ele.innerHTML.indexOf("img") >= 0) {img.src = ele.getElementsByTagName("img")[0].src;imgload(img, function() {context.drawImage(img, canvas.width / 2 - img.width / 2, canvas.height / 2 - img.width / 2);dots = getimgData(canvas, context, dr);callback(dots);})} else {var text = ele.innerHTML;context.save();var fontSize = 200;context.font = fontSize + "px 宋体 bold";context.textAlign = "center";context.textBaseline = "middle";context.fillStyle = "rgba(" + parseInt(getRandom(128, 255)) + "," + parseInt(getRandom(128, 255)) + "," + parseInt(getRandom(128, 255)) + " , 1)";context.fillText(text, canvas.width / 2, canvas.height / 2);context.restore();dots = getimgData(canvas, context, dr);callback(dots);}}function imgload(img, callback) {if (img.complete) {callback.call(img);} else {img.onload = function() {callback.call(this);}}}function getimgData(canvas, context, dr) {var imgData = context.getImageData(0, 0, canvas.width, canvas.height);context.clearRect(0, 0, canvas.width, canvas.height);var dots = [];for (var x = 0; x < imgData.width; x += dr) {for (var y = 0; y < imgData.height; y += dr) {var i = (y * imgData.width + x) * 4;if (imgData.data[i + 3] > 128) {var dot = {x: x,y: y,a: imgData.data[i],b: imgData.data[i + 1],c: imgData.data[i + 2]};dots.push(dot);}}}return dots;}function getRandom(a, b) {return Math.random() * (b - a) + a;}var maxRadius = 1,stars = [];function drawBg() {for (var i = 0; i < 100; i++) {var r = Math.random() * maxRadius;var x = Math.random() * canvas.width;var y = Math.random() * 2 * canvas.height - canvas.height;var star = new Star(x, y, r);stars.push(star);star.paint()}}var Star = function(x, y, r) {this.x = x;this.y = y;this.r = r;}Star.prototype = {paint: function() {ctx.save();ctx.beginPath();ctx.arc(this.x, this.y, this.r, 0, 2 * Math.PI);ctx.fillStyle = "rgba(255,255,255," + this.r + ")";ctx.fill();ctx.restore();}}var focallength = 250;var Frag = function(centerX, centerY, radius, color, tx, ty) {this.tx = tx;this.ty = ty;this.x = centerX;this.y = centerY;this.dead = false;this.centerX = centerX;this.centerY = centerY;this.radius = radius;this.color = color;}Frag.prototype = {paint: function() {ctx.save();ctx.beginPath();ctx.arc(this.x, this.y, this.radius, 0, 2 * Math.PI);ctx.fillStyle = "rgba(" + this.color.a + "," + this.color.b + "," + this.color.c + ",1)";ctx.fill()ctx.restore();},moveTo: function(index) {this.ty = this.ty + 0.3;var dx = this.tx - this.x,dy = this.ty - this.y;this.x = Math.abs(dx) < 0.1 ? this.tx : (this.x + dx * 0.1);this.y = Math.abs(dy) < 0.1 ? this.ty : (this.y + dy * 0.1);if (dx === 0 && Math.abs(dy) <= 80) {this.dead = true;}this.paint();}}</script>
</body></html>

需要的图片

city.png

moon.png

最后

希望各位彦祖们，能给一个三连！

我与旧事归于尽，来年依旧林花开

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文章目录

前言

代码

需要的图片

最后

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