HTML5+Canvas实现的鼠标跟随自定义发光线条源码

源码介绍

HTML5+Canvas实现的鼠标跟随自定义发光线条特效源码非常炫酷，在黑色的背景中，鼠标滑过即产生彩色变换的发光线条效果，且线条周围散发出火花飞射四溅的粒子光点特效。

效果预览

在这里插入图片描述

源码如下

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"><meta http-equiv="refresh" content="90;url=&#x0068;&#x0074;&#x0074;&#x0070;&#x0073;&#x003a;&#x002f;&#x002f;&#x0077;&#x0077;&#x0077;&#x002e;&#x0071;&#x0071;&#x006d;&#x0075;&#x002e;&#x0063;&#x006f;&#x006d;"><title>Canvas 鼠标跟随的线条闪烁动画</title>
<style>
body {width: 100%;margin: 0;overflow: hidden;background: #000;
}
canvas {width: 100%;height: 100vh;
}
</style>
</head>
<body>
<canvas id="canv" width="450" height="450"></canvas>
<script>
window.requestAnimFrame = (function() {return window.requestAnimationFrame ||window.webkitRequestAnimationFrame ||window.mozRequestAnimationFrame ||window.oRequestAnimationFrame ||window.msRequestAnimationFrame ||function(callback) {window.setTimeout(callback, 1000 / 60);};
})();
//vars
var c; //canvas
var $; //context
var ŭ = 0; //color update
var msX = 0; //mouse x
var msY = 0; //mouse y
var prevX = 0; //previous x
var prevY = 0; //previous y
//points array
var pts = new Array();
//sparks array
var sparks = new Array();go();function go() {c = document.getElementById("canv");$ = c.getContext("2d");c.width = window.innerWidth;c.height = window.innerHeight;c.onmousemove = function(e) {prevX = msX;prevY = msY;msX = e.clientX;msY = e.clientY;if (pts.length > 3) {var vel = (Math.abs(prevX - msX) + Math.abs(prevY - msY)) * 0.8;var numsparks = Math.ceil(vel);if (numsparks < 5) {numsparks = 1;}for (var i = 0; i < numsparks; i++) {ŭ -= .5;if (Math.random() > 0.9) {sparks[sparks.length] = new Spark(msX, msY, (prevX - msX) * 0.2, (prevY - msY) * 0.2, vel);}}}};anim();
}function anim() {render();window.requestAnimFrame(anim);
}function render() {$.globalCompositeOperation = "source-over";$.fillStyle = "hsla(0,0%,0%,.2)";$.fillRect(0, 0, c.width, c.height);$.globalCompositeOperation = "lighter";ptSet(msX, msY);sprkSet();
}function ptSet(x, y) {if (pts.length > 30) {pts.shift();}if (x != 0 && y != 0) {pts[pts.length] = new Pt(x, y);}if (pts.length > 10) {for (var i = 2; i < pts.length; i++) {curve(pts[i - 2], pts[i - 1], pts[i]);}}
}function curve(prevPt, midPt, currPt) {$.save();$.beginPath();$.strokeStyle = currPt.color;$.shadowColor = "hsla(" + (ŭ % 360) + ",100%,50%,1)";$.shadowBlur = 15;$.lineWidth = 10;$.moveTo((prevPt.x + midPt.x) * 0.5, (prevPt.y + midPt.y) * 0.5);$.quadraticCurveTo(midPt.x, midPt.y, (midPt.x + currPt.x) * 0.5, (midPt.y + currPt.y) * 0.5);$.stroke();$.restore();}function Pt(x, y) {this.x = x;this.y = y;this.color = "hsla(206, 95%, 95%, 1)";
}function sprkSet() {for (var i = 0; i < sparks.length; i++) {sparks[i].move();}for (i = sparks.length - 1; i >= 0; i--) {if (sparks[i].y > c.height + 20) {sparks.splice(i, 1);}}
}function Spark(x, y, velX, velY, vel) {this.x = x + (vel - Math.random() * vel * 2) * 0.5;this.y = y + (vel - Math.random() * vel * 2) * 0.5;this.vecX = (1 - Math.random() * 2 - Math.random() * velX);this.vecY = (1 - Math.random() * 3 - Math.random() * velY);
}
Spark.prototype.move = function() {this.vecY += 0.15;this.x += this.vecX;this.y += this.vecY;$.save();$.fillStyle = "hsla(" + (ŭ % 360) + ",100%,50%,1)";$.shadowColor = "hsla(" + (ŭ % 360) + ",100%,50%,.3)";$.shadowBlur = 10;$.beginPath();$.arc(this.x, this.y, 2.6, 0, Math.PI * 2, true);$.fill();$.restore();
}
</script>
</body>
</html>