Silvesterfeuerwerk - Website X5 Helpsite

Ein Feuerwerk für die Homepage

// Zufällige Farben

_color: ['#D0D0D0', '#FF0000', '#FFFF00', '#22FF00', '#2040FF', '#00CCFF', '#FF00FF', '#A319D6'],

// Schwerkraft Faktor

_gravity: 0.07,

// Luftwiderstand Faktor

_resistance: 0.975,

// zIndex der Partikel

_zIndex: 50000,

// Maximales Alter der Partikel (in msec)

_maxAge: 1000,

// Intervall der auftretenden Explosionen (in msec)

_interval: [100, 800],

// Anzahl der Partikel pro Explosion

_particlesPerExplosion: 200,

// Maximale Geschwindigkeit der Partikel im Moment der Explosion

_speed: 10,

// Minimale/Maximale Größe der Partikel

_minSize: 8,

_maxSize: 14,

_particles: [],

_bodyWidth: 0,

_bodyHeight: 0,

_count: 0,

_lastInterval: 0,

init: function() {

this._addEventListener(window, 'resize', function() { return fireworks.resize.apply(fireworks); });

this._addEventListener(window, 'load', function() { return fireworks.start.apply(fireworks); });

},

_addEventListener: function(el, name, handler) {

if (el.addEventListener)

el.addEventListener(name, handler, false);

else if (el.attachEvent)

el.attachEvent('on' + name, handler);

},

start: function() {

this.resize();

this._animFn = function() {fireworks._move();};

this._lastInterval = this._time();

requestAnimFrame(this._animFn);

this._addExplosion();

   },

_time: function() {

return +new Date();

},

_random: function(value) {

return Math.random() * value;

},

_randomArray: function(arr) {

return arr[

Math.floor(

Math.random() * (arr.length)

)

];

},

_addExplosion: function() {

var x = Math.floor(this._random(this._bodyWidth)),

y = Math.floor((this._random(.5) + .1) * this._bodyHeight),

dx = this._random(10) - 5,

dy = this._random(-2) - 1,

c1 = this._randomArray(this._color),

c2 = this._randomArray(this._color);

for (var i = 0; i < this._particlesPerExplosion; i++) {

this._createParticle(

x,

y,

dx,

dy,

i / (this._particlesPerExplosion - 1) * 180 * Math.PI,

this._random(this._speed),

this._random(1) > .5 ? c1 : c2

);

}

window.setTimeout(

function() {

return fireworks._addExplosion.apply(fireworks);

},

this._random(this._interval[1] - this._interval[0]) + this._interval[0]

);

},

_createParticle: function(x, y, dx, dy, rot, speed, color) {

var el = null,

foundEl = false,

p = this._particles;

for (var i = 0, l = p.length; i < l; i++)

if (p[i].data.age > 1) {

el = p[i];

foundEl = true;

break;

}

if (!foundEl) {

el = document.createElement('div');

el.className       = 'particle';

el.style.position  = 'absolute';

el.style.fontSize  = this._maxSize + 'px';

el.style.zIndex    = this._zIndex;

el.style.width     = this._maxSize + 'px';

el.style.textAlign = 'center';

el.style.overflow  = 'hidden';

el.innerHTML       = '&#x25cf;';

}

el.style.left  = x + 'px';

el.style.top   = y + 'px';

el.style.color = color;

el.data = {

x: x,

y: y,

dx: Math.cos(rot) * speed + dx,

dy: Math.sin(rot) * speed + dy,

color: color,

age: Math.random() * .25

};

if (!foundEl) {

document.getElementsByTagName('body')[0].appendChild(el);

this._particles.push(el);

}

},

_move: function() {

requestAnimFrame(this._animFn);

var dif = this._time() - this._lastInterval;

this._lastInterval = this._time();

var delta = dif / 20,

el,

d,

p = this._particles,

r = Math.pow(this._resistance, delta),

g = this._gravity * delta,

a = dif / this._maxAge;

for (var i = 0, l = p.length; i < l; i++) {

el = p[i];

d = el.data;

if (d.age > 1)

continue;

d.age += a;

d.dy += g;

d.dx *= r;

d.dy *= r;

d.x += d.dx * delta;

d.y += d.dy * delta;

if (d.x < 0) {

d.dx *= -1;

d.x = 0;

}

else if (d.x > this._bodyWidth) {

d.dx *= -1;

d.x = this._bodyWidth;

}

if (d.y < 0) {

d.dy *= -1;

d.y = 0;

}

else if (d.y > this._bodyHeight) {

d.dy *= -1;

d.y = this._bodyHeight;

}

if (d.age > 1)

d.x = d.y = 0;

el.style.left = d.x + 'px';

el.style.top = d.y + 'px';

el.style.color = (Math.random() * .5 + d.age >= 1) ? 'transparent' : d.color;

el.style.fontSize = Math.max(this._minSize, (1 - d.age) * this._maxSize) + 'px';

}

},

resize: function() {

this._bodyWidth = this._getWindowWidth() - this._maxSize;

this._bodyHeight = this._getWindowHeight() - this._maxSize - 10;

},

_getWindowWidth: function() {

return document.getElementsByTagName('body')[0].offsetWidth;

},

_getWindowHeight: function() {

var h = Math.max(self.innerHeight || 0, window.innerHeight || 0);

if (document.documentElement)

h = Math.max(h, document.documentElement.clientHeight || 0);

if (document.body) {

h = Math.max(h, document.body.clientHeight || 0);

h = Math.max(h, document.body.scrollHeight || 0);

h = Math.max(h, document.body.offsetHeight || 0);

}

return h;

}

 return  window.requestAnimationFrame   ||

 window.webkitRequestAnimationFrame ||

 window.mozRequestAnimationFrame    ||

 window.oRequestAnimationFrame      ||

 window.msRequestAnimationFrame     ||

 function (cb){

window.setTimeout(cb, 1000 / 60);

 };