情人节你们过，表白代码我来写（HTML+CSS+JS）_陈新科

大大的周 02-07 1488

雷迪森安的乡亲们，欢迎来到老实人的前端课堂，这情人节的，我把爱心都给你们准备好了，今天我们来写个爱心吧。

正片

注意看到最后哦，下面还有一个更好看的特效，这个是个动态的??

结构就两行 <script src="https://wow.techbrood.com/libs/jquery/jquery-1.11.1.min.js"></script> <canvas id="canvas"></canvas> 样式

以下样式大部分是js代码渲染上dom后表现出来的

body { margin: 0; font-family: Helvetica, Arial; font-weight: 100; overflow: hidden; } canvas { background-color: rgb(244, 244, 244); } footer { position: fixed; bottom: 0; width: 100%; } footer img { border-radius: 100%; width: 30px; height: 30px; margin-left: 10px; } footer span { display: block; padding: 10px; display: flex; justify-content: flex-end; align-items: center; } 表现

关键代码，满满注释哦，这我可够意思了哈，不懂的话再私下问我吧。

//---------- MAIN FUNCTION ---------- function init() { renderable = []; path = new Shape(new Heart(), new Point(cw / 2, ch / 2), new Color(244, 244, 244, 1), { scale: 10 }); animate(); } function animate() { addShape(angle); addShape(angle2); angle += 0.05; angle2 -= 0.05; ctx.clearRect(0, 0, cw, ch); for (var i = 0; i < renderable.length; i++) { renderable[i].draw(canvas); if (renderable[i].scale <= 0) renderable.splice(i, 1); } path.draw(canvas); requestAnimationFrame(animate); } function addShape(angle) { renderable.push(new Shape(new Circle(5), new Point(cw / 2, ch / 2), new Color(253, 192, 192, 1), { position: (((path.geometry.getPositionByAngle(angle)).multiply(path.scale)).add(path.position.clone())), decay: 0.1, scale: 3 })); } //----------------------------------- var canvas, ctx, cw, ch; var FPS = 60; var renderable = [], path, path2, angle = 0, angle2 = 0, color; var requestAnimationFrame = window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.msRequestAnimationFrame || function(callback) { return setTimeout(callback, FPS); }; window.onload = function() { initCanvas(); ctx.clearRect(0, 0, cw, ch); init(); } window.onresize = function() { initCanvas(); ctx.clearRect(0, 0, cw, ch); }; function initCanvas() { canvas = document.getElementById('canvas'); ctx = canvas.getContext('2d'); cw = window.innerWidth; ch = window.innerHeight; canvas.width = cw; canvas.height = ch; } //---------------- APP UTIL ------------------ function getRandomNumber(min, max) { return Math.random() * (max - min + 1) + min; } //---------- EXTRACT OF MY NEXT FRAMEWORK ------------ //----------- PROTOTYPES ------------- //===== GEOMETRY ===== //----- SHAPE ----- function Shape(geometry, position, color, properties) { this.position = (position == null || position.classname != "Point") ? new Point() : position; this.geometry = (geometry == null || geometry.constructor.name != "GenericObject") ? new Circle() : geometry; this.color = (color == null || color.classname != "Color") ? null : color; this.lineColor = null; this.lineWidth = 1; this.scale = 1; this.decay = 0; if (properties != null) this.setProperties(properties); GenericObject.call(this, "Shape"); } Shape.prototype = new GenericObject(); Shape.prototype.setProperties = function(properties) { for (var p in properties) { this[p] = properties[p]; } } Shape.prototype.draw = function(canvas) { if (this.scale > 0) { var ctx = canvas.getContext('2d'); var cw = canvas.width; var ch = canvas.height; ctx.beginPath(); if (this.lineWidth > 0 && (this.lineColor != null && this.lineColor.classname == "Color")) { ctx.strokeStyle = this.lineColor.getRGBA(); ctx.lineWidth = this.lineWidth; } if (this.color != null && this.color.classname == "Color") { ctx.fillStyle = this.color.getRGBA(); } switch (this.geometry.classname) { case "Circle": ctx.arc(this.position.x, this.position.y, this.geometry.radius * this.scale, 0, Math.PI * 2); break; case "Heart": for (var i = 0; i < Math.PI * 2; i += 0.05) { var p = this.geometry.getPositionByAngle(i); p.multiply(this.scale); p.add(this.position); if (i == 0) ctx.moveTo(p.x, p.y); else ctx.lineTo(p.x, p.y); } break; } if (this.lineColor != null && this.lineColor.classname == "Color") ctx.stroke(); if (this.color != null) ctx.fill(); this.scale -= this.decay; } } //----- POINT ----- function Point(x, y) { this.x = (x != null && !isNaN(x)) ? x : 0; this.y = (y != null && !isNaN(y)) ? y : 0; GenericObject.call(this, "Point"); } Point.prototype = new GenericObject(); Point.prototype.add = function(p2) { if (p2.classname != this.classname) return null; this.x += p2.x; this.y += p2.y; return this; } Point.prototype.multiply = function(scale) { this.x *= scale; this.y *= scale; return this; } //----- CIRCLE ----- function Circle(radius) { this.center = new Point(); this.radius = (radius != null && !isNaN(radius)) ? radius : 1; GenericObject.call(this, "Circle"); } Circle.prototype = new GenericObject(); //----- HEART ----- function Heart(scale) { this.scale = (scale != null && !isNaN(scale)) ? scale : 1; GenericObject.call(this, "Heart"); } Heart.prototype = new GenericObject(); Heart.prototype.getPositionByAngle = function(angle) { if (angle == null || isNaN(angle)) return null; var x = 16 * Math.pow(Math.sin(angle), 3); var y = -(13 * Math.cos(angle) - 5 * Math.cos(2 * angle) - 2 * Math.cos(3 * angle) - Math.cos(4 * angle)); return new Point(x * this.scale, y * this.scale); } //===== COLOR ===== function Color(r, g, b, a) { this.r = (r != null || isNaN(r)) ? r : 0; this.g = (g != null || isNaN(g)) ? g : 0; this.b = (b != null || isNaN(b)) ? b : 0; this.a = (a != null || isNaN(a)) ? a : 1; this.hex = this.toHex(); GenericObject.call(this, "Color"); } Color.prototype = new GenericObject(); Color.prototype.toHex = function() { var bin = this.r << 16 | this.g << 8 | this.b; return (function(h) { return "#" + new Array(7 - h.length).join("0") + h })(bin.toString(16).toUpperCase()) } Color.prototype.getRGBA = function() { return "rgba(" + this.r + "," + this.g + "," + this.b + "," + this.a + ")"; } Color.prototype.setHex = function(hex) { this.r = hex >> 16; this.g = hex >> 8 & 0xFF; this.b = hex & 0xFF; this.hex = this.toHex(); } //===== GENERICOBJECT ===== function GenericObject(name) { this.classname = name; } GenericObject.prototype.clone = function() { var copy = new GenericObject(this.classname); for (var attr in this) { if (this.hasOwnProperty(attr)) { if (this[attr].constructor.name == "GenericObject") copy[attr] = this[attr].clone(); else copy[attr] = this[attr]; } } return copy; }

不学没思路，看完是不是感觉也不难啊？你做出来了吗？

还有下面这个情人节代码我就不写了，更多表白代码可以在下方公z号获取~

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最后

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