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文库首页前端Javascript基于HTML5特效包含流星雨特效、爱心特效、炫酷特效、烟花特效

基于HTML5特效包含流星雨特效、爱心特效、炫酷特效、烟花特效

HTML特效

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基于HTML5特效包含流星雨特效、爱心特效、炫酷特效、烟花特效

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(1) 有趣特效

<!DOCTYPE html>

<head>

window.onload = function () {

C = Math.cos; // cache Math objects

S = Math.sin;

U = 0;

w = window;

j = document;

d = j.getElementById("c");

c = d.getContext("2d");

W = d.width = w.innerWidth;

H = d.height = w.innerHeight;

c.fillRect(0, 0, W, H); // resize <canvas> and draw black rect

(default)

c.globalCompositeOperation = "lighter"; // switch to additive

color application

c.lineWidth = 0.2;

c.lineCap = "round";

var bool = 0,

t = 0; // theta

d.onmousemove = function (e) {

if(window.T) {

if(D==9) { D=Math.random()*15; f(1); }

clearTimeout(T);

}

X = e.pageX; // grab mouse pixel coords

Y = e.pageY;

a=0; // previous coord.x

b=0; // previous coord.y

A = X, // original coord.x

B = Y; // original coord.y

R=(e.pageX/W * 999>>0)/999;

r=(e.pageY/H * 999>>0)/999;

U=e.pageX/H * 360 >>0;

D=9;

g = 360 * Math.PI / 180;

T = setInterval(f = function (e) { // start looping spectrum

c.save();

c.globalCompositeOperation = "source-over"; // switch to additive

color application

if(e!=1) {

c.fillStyle = "rgba(0,0,0,0.02)";

c.fillRect(0, 0, W, H); // resize <canvas> and draw black rect

(default)

}

c.restore();

i = 25; while(i --) {

c.beginPath();

if(D > 450 || bool) { // decrease diameter

if(!bool) { // has hit maximum

bool = 1;

}

if(D < 0.1) { // has hit minimum

bool = 0;

}

t -= g; // decrease theta

D -= 0.1; // decrease size

}

if(!bool) {

t += g; // increase theta

D += 0.1; // increase size

}

q = (R / r - 1) * t; // create hypotrochoid from current mouse

position, and setup variables (see:

http://en.wikipedia.org/wiki/Hypotrochoid)

x = (R - r) * C(t) + D * C(q) + (A + (X - A) * (i / 25)) + (r -

R); // center on xy coords

y = (R - r) * S(t) - D * S(q) + (B + (Y - B) * (i / 25));

if (a) { // draw once two points are set

c.moveTo(a, b);

c.lineTo(x, y)

}

c.strokeStyle = "hsla(" + (U % 360) + ",100%,50%,0.75)"; // draw

rainbow hypotrochoid

c.stroke();

a = x; // set previous coord.x

b = y; // set previous coord.y

}

U -= 0.5; // increment hue

A = X; // set original coord.x

B = Y; // set original coord.y

}, 16);

}

j.onkeydown = function(e) { a=b=0; R += 0.05 }

d.onmousemove({pageX:300, pageY:290})

}

</script>

</head>

<body

style="margin:0px;padding:0px;width:100%;height:100%;overflow:hidd

en;">

</body>

</html>

（2）爱心特效

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">

<HTML>

<HEAD>

<TITLE> New Document </TITLE>

<style>

html, body {

height: 100%;

padding: 0;

margin: 0;

background: #000;

}

canvas {

position: absolute;

width: 100%;

height: 100%;

}

</style>

</HEAD>

<BODY>

* Settings

var settings = {

particles: {

length: 500, // maximum amount of particles

duration: 2, // particle duration in sec

velocity: 100, // particle velocity in pixels/sec

effect: -0.75, // play with this for a nice effect

size: 30, // particle size in pixels

};

* RequestAnimationFrame polyfill by Erik Möller

(function(){var b=0;var c=["ms","moz","webkit","o"];for(var

a=0;a<c.length&&!window.requestAnimationFrame;++a){window.requestAnim

ationFrame=window[c[a]+"RequestAnimationFrame"];window.cancelAnimatio

nFrame=window[c[a]+"CancelAnimationFrame"]||window[c[a]+"CancelReques

tAnimationFrame"]}if(!window.requestAnimationFrame){window.requestAni

mationFrame=function(h,e){var d=new Date().getTime();var

f=Math.max(0,16-(d-b));var

g=window.setTimeout(function(){h(d+f)},f);b=d+f;return

g}}if(!window.cancelAnimationFrame){window.cancelAnimationFrame=funct

ion(d){clearTimeout(d)}}}());

* Point class

var Point = (function() {

function Point(x, y) {

this.x = (typeof x !== 'undefined') ? x : 0;

this.y = (typeof y !== 'undefined') ? y : 0;

}

Point.prototype.clone = function() {

return new Point(this.x, this.y);

};

Point.prototype.length = function(length) {

if (typeof length == 'undefined')

return Math.sqrt(this.x * this.x + this.y * this.y);

this.normalize();

this.x *= length;

this.y *= length;

return this;

};

Point.prototype.normalize = function() {

var length = this.length();

this.x /= length;

this.y /= length;

return this;

};

return Point;

})();

* Particle class

var Particle = (function() {

function Particle() {

this.position = new Point();

this.velocity = new Point();

this.acceleration = new Point();

this.age = 0;

}

Particle.prototype.initialize = function(x, y, dx, dy) {

this.position.x = x;

this.position.y = y;

this.velocity.x = dx;

this.velocity.y = dy;

this.acceleration.x = dx * settings.particles.effect;

this.acceleration.y = dy * settings.particles.effect;

this.age = 0;

};

Particle.prototype.update = function(deltaTime) {

this.position.x += this.velocity.x * deltaTime;

this.position.y += this.velocity.y * deltaTime;

this.velocity.x += this.acceleration.x * deltaTime;

this.velocity.y += this.acceleration.y * deltaTime;

this.age += deltaTime;

};

Particle.prototype.draw = function(context, image) {

function ease(t) {

return (--t) * t * t + 1;

}

var size = image.width * ease(this.age /

settings.particles.duration);

context.globalAlpha = 1 - this.age / settings.particles.duration;

context.drawImage(image, this.position.x - size / 2,

this.position.y - size / 2, size, size);

};

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基于HTML5特效包含流星雨特效、爱心特效、炫酷特效、烟花特效

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