web酷炫粒子特效
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<html lang="en"><head><meta charset="gbk2312"><title>粒子背景</title><link rel="stylesheet" type="text/css" href="style.css" media="all"><style>html,body {font-size: 14px;font-family: "微软雅黑", Helvetica, Tahoma, Arial, sans-serif;color: #000;background-color: #30333F;margin: 0;padding: 0;}img {border: 0;}.cf:before,.cf:after {display: table;content: "";}.cf:after {clear: both;}.cf {*zoom: 1;}canvas {position: fixed;top: 0px;}</style>
</head><body id="login-page"><canvas width="1293" height="717"></canvas><script>/*** Created by Administrator on 2016/6/29.*/var canvas = document.querySelector('canvas'),ctx = canvas.getContext('2d')canvas.width = window.innerWidth;canvas.height = window.innerHeight;ctx.lineWidth = .3;ctx.strokeStyle = (new Color(150)).style;var mousePosition = {x: 30 * canvas.width / 100,y: 30 * canvas.height / 100};var dots = {nb: 750,distance: 50,d_radius: 100,array: []};function colorValue(min) {return Math.floor(Math.random() * 255 + min);}function createColorStyle(r, g, b) {return 'rgba(' + r + ',' + g + ',' + b + ', 0.8)';}function mixComponents(comp1, weight1, comp2, weight2) {return (comp1 * weight1 + comp2 * weight2) / (weight1 + weight2);}function averageColorStyles(dot1, dot2) {var color1 = dot1.color,color2 = dot2.color;var r = mixComponents(color1.r, dot1.radius, color2.r, dot2.radius),g = mixComponents(color1.g, dot1.radius, color2.g, dot2.radius),b = mixComponents(color1.b, dot1.radius, color2.b, dot2.radius);return createColorStyle(Math.floor(r), Math.floor(g), Math.floor(b));}function Color(min) {min = min || 0;this.r = colorValue(min);this.g = colorValue(min);this.b = colorValue(min);this.style = createColorStyle(this.r, this.g, this.b);}function Dot() {this.x = Math.random() * canvas.width;this.y = Math.random() * canvas.height;this.vx = -.5 + Math.random();this.vy = -.5 + Math.random();this.radius = Math.random() * 2;this.color = new Color();}Dot.prototype = {draw: function () {ctx.beginPath();ctx.fillStyle = this.color.style;ctx.arc(this.x, this.y, this.radius, 0, Math.PI * 2, false);ctx.fill();}};function createDots() {for (i = 0; i < dots.nb; i++) {dots.array.push(new Dot());}}function moveDots() {for (i = 0; i < dots.nb; i++) {var dot = dots.array[i];if (dot.y < 0 || dot.y > canvas.height) {dot.vx = dot.vx;dot.vy = - dot.vy;}else if (dot.x < 0 || dot.x > canvas.width) {dot.vx = - dot.vx;dot.vy = dot.vy;}dot.x += dot.vx;dot.y += dot.vy;}}function connectDots() {for (i = 0; i < dots.nb; i++) {for (j = i; j < dots.nb; j++) {i_dot = dots.array[i];j_dot = dots.array[j];if ((i_dot.x - j_dot.x) < dots.distance && (i_dot.y - j_dot.y) < dots.distance && (i_dot.x - j_dot.x) > - dots.distance && (i_dot.y - j_dot.y) > - dots.distance) {if ((i_dot.x - mousePosition.x) < dots.d_radius && (i_dot.y - mousePosition.y) < dots.d_radius && (i_dot.x - mousePosition.x) > - dots.d_radius && (i_dot.y - mousePosition.y) > - dots.d_radius) {ctx.beginPath();ctx.strokeStyle = averageColorStyles(i_dot, j_dot);ctx.moveTo(i_dot.x, i_dot.y);ctx.lineTo(j_dot.x, j_dot.y);ctx.stroke();ctx.closePath();}}}}}function drawDots() {for (i = 0; i < dots.nb; i++) {var dot = dots.array[i];dot.draw();}}function animateDots() {ctx.clearRect(0, 0, canvas.width, canvas.height);moveDots();connectDots();drawDots();requestAnimationFrame(animateDots);}document.querySelector('canvas').addEventListener('mousemove', function (e) {mousePosition.x = e.pageX;mousePosition.y = e.pageY;})document.querySelector('canvas').addEventListener('mouseleave', function (e) {mousePosition.x = canvas.width / 2;mousePosition.y = canvas.height / 2;})createDots();requestAnimationFrame(animateDots);</script>
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