Web前端H5 canvas好玩的网站背景

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代码片段 1

<!DOCTYPE html>

<html>

<head>

<title>particle nets</title>

<style>

html,

body {

margin: 0;

padding: 0;

height: 100%;

overflow: hidden;

}

</style>

</head>

<body>

var canvas = document.getElementById(“cas”),

ctx = canvas.getContext(“2d”);

function resize() {

canvas.width = window.innerWidth || document.documentElement.clientWidth || document.body.clientWidth;

canvas.height = window.innerHeight || document.documentElement.clientHeight || document.body.clientHeight;

console.log(“canvasWidth:” + canvas.width, “canvasHeight:” + canvas.height);

}

resize();

window.onresize = resize;

var RAF = (function () {

return window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.setTimeout(callback, 1000 / 60);

})();

var warea = { x: null, y: null, max: 20000 };

window.onmousemove = function (e) {

e = e || event;

warea.x = e.clientX;

warea.y = e.clientY;

};

window.onmouseout = function (e) {

e = e || event;

warea.x = null;

warea.y = null;

}

var dots = [];

for (var i = 0; i < 300; i++) {

var x = Math.random() * canvas.width,

y = Math.random() * canvas.height;

var xa = Math.random() * 2 – 1,

ya = Math.random() * 2 – 1;

dots.push({ “x”: x, “y”: y, “xa”: xa, “ya”: ya, “max”: 6000 });

}

setTimeout(function () { animate(); }, 100);

function animate() {

ctx.clearRect(0, 0, canvas.width, canvas.height);

var ndots = [warea].concat(dots);

dots.forEach(function (dot) {

dot.x += dot.xa;

dot.y += dot.ya;

dot.xa *= (dot.x > canvas.width || dot.x < 0) ? -1 : 1;

dot.ya *= (dot.y > canvas.height || dot.y < 0) ? -1 : 1;

ctx.fillRect(dot.x – .5, dot.y – .5, 1, 1);

for (var i = 0; i < ndots.length; i++) {

var d2 = ndots[i];

if (dot === d2 || d2.x === null || d2.y === null) continue;

var xc = dot.x – d2.x,

yc = dot.y – d2.y;

var dis = xc * xc + yc * yc;

var ratio;

if (dis < d2.max) {

if (d2 === warea && dis > (d2.max / 2)) {

dot.x -= xc * 0.03;

dot.y -= yc * 0.03;

}

ratio = (d2.max – dis) / d2.max;

ctx.beginPath();

ctx.lineWidth = ratio / 2;

ctx.strokeStyle = “rgba(0,0,0,” + (ratio + .2) + “)”;

ctx.moveTo(dot.x, dot.y);

ctx.lineTo(d2.x, d2.y);

ctx.stroke();

}

ndots.splice(ndots.indexOf(dot), 1);

});

RAF(animate);

}

</script>

</body>

</html>

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