ÿþ//

// Copyright (C) 2008 by Fabian Schlieper

// Schnee v1.2

// http://www.fabi.me/

// Ohne dieses Copyright darf dieser Code nicht verwendet werden!

//



// die ID des HTML-Elements, in dem es schneien soll

var snow_area_id = 'winter';



// maximale Anzahl der sichtbaren Schneeflocken

var snow_flake_count = 350;



// die verschiedenen Farbe, die die Schneeflocken haben sollen

var snow_colors = new Array('#FFFFFF','#EFEFEF','#EEEEEE','#FFFFFF','#FEFFFF');



// die Schriftarten, aus denen die Schneeflocken bestehen sollen

var snow_fonts  = new Array('Arial Black', 'Arial Narrow', 'Times', 'Comic Sans MS');



var snow_char = 'Ï%';		// das Zeichen, das als Schneeflocke verwendet wird

var snow_gravity = 0.8;		// wie schnell die Schneeflocken fallen

var snow_max_size = 22;		// die maximale Schriftgröße einer Schneeflocke

var snow_min_size = 10;		// die minimale Schriftgröße einer Schneeflocke



var snow_init_delay = 50;	// Verzögerungszeit in Millisekunden, bevor es zu schneien anfängt





// ######################################################################

// HIER ENDET DIE KONFIGURATION. ÄNDERUNGEN IM FOLGENDEN SETZEN JAVSCRIPT-KENNTNISSE VORAUS

// ######################################################################



var snow_init_time = 0;

var snowflakes = new Array();

var snow_area_el = null;



function createSnowflakes()

{

	var style = 'position:absolute; top:-' + snow_max_size + 'px; z-index:99;';

	for (var i = 0; i <= snow_flake_count; i++)

		document.write('<sp' + 'an id="snwflk' + i + '" style="' + style + '">' + snow_char + '</sp' + 'an>');

}



function randInt(range) { return Math.floor(Math.random() * range); }



function initSnow()

{	

	snow_area_el = document.getElementById(snow_area_id);

	

	// reapeat until we have the snow_area_el

	if(!snow_area_el || snow_area_el.offsetWidth <= snow_max_size || snow_area_el.offsetHeight <= snow_max_size) {

		// after 5 secs cancel

		if(snow_init_time < 5000)

			window.setTimeout('initSnow()', 50);

			

		snow_init_time += 50;

		return;

	}

	

	// offest fix

	snow_area_el.style.position = 'relative';	

			

	for (var i = 0; i <= snow_flake_count; i++)

	{	

		snowflakes[i] = document.getElementById('snwflk' + i);

		

		snowflakes[i].size = (randInt(snow_max_size - snow_min_size) + snow_min_size);		

		snowflakes[i].posx = -snowflakes[i].size;

		snowflakes[i].posy = -snowflakes[i].size;

		snowflakes[i].sink = (snow_gravity * snowflakes[i].size / snow_min_size);

		snowflakes[i].wobamp = (Math.random() * (snowflakes[i].size));

		snowflakes[i].wob = 0.0;

		snowflakes[i].wobspeed = (0.03 + Math.random() / 10.0);

		

		snowflakes[i].style.fontFamily = snow_fonts[randInt(snow_fonts.length)];

		snowflakes[i].style.fontSize = snowflakes[i].size + 'px';

		snowflakes[i].style.color = snow_colors[randInt(snow_colors.length)];

	}

	

	window.setInterval('updateSnow()', 50);

}



function updateSnow()

{

	var bl = snow_area_el.offsetLeft;

	var bt = snow_area_el.offsetTop;

	var bw = snow_area_el.offsetWidth;

	var bh = snow_area_el.offsetHeight;	

	var br = bl + bw;	

	var bb = bt + bh;	

		

	for (var i = 0; i <= snow_flake_count; i++)

	{

		snowflakes[i].wob += snowflakes[i].wobspeed;

		var x = snowflakes[i].posx + (snowflakes[i].wobamp * Math.sin(snowflakes[i].wob));		

		snowflakes[i].posy += snowflakes[i].sink;

		

		snowflakes[i].style.left = Math.round(x) + 'px';

		snowflakes[i].style.top = Math.round(snowflakes[i].posy) + 'px';

		

		var s = snowflakes[i].size;		

		// check bounds

		if (snowflakes[i].posy > (bb - s) || x < bl || x  > (br - s))

		{

			snowflakes[i].posx = bl + s + randInt(bw - (3 * s));

			

			if(snowflakes[i].posy < 0)

				snowflakes[i].posy = bt + randInt(bh - 2 * s);

			else

				snowflakes[i].posy = bt;

		}

	}

}



// Schnee initialisieren

createSnowflakes();

window.setTimeout('initSnow()', Math.max(50, snow_init_delay));