/*

	 file	 : BKG.as
	 version : 1.0
	 	
	 Created by Cousot Stephane on Tue Apr 8 2003.
	 (cc) Creative Commons.
	 
	 ***
	 
	 FADE BACKGROUND COLOR
	 
	 . drawBKG():
	 	To draw a color shape call the drawBKG() method.
	 	The drawBKG(hex, rect) method takes two arguments :
		hex as color  - the hexadecimal color value (ex. red is 0xFF0000, blue is 0x0000FF, and so on)
		rect as array - defines a rectangle whose sides are specified by left, top, right, and bottom ( [left, top, right, bottom] )
	 
	 . hexToRGB():
	 	To convert a hexadecimal color value to a RGB color value call hexToRGB() method.
		the hexToRGB(hex) method takes one argument and return an array :
		hex as color  - the hexadecimal color value (ex. red is 0xFF0000, blue is 0x0000FF, and so on)
		
	 . redraw():
		To set this movie clip in full stage mode call the redraw() method.
		
	 . fadeBKG():
	 	To start to fade to a color call the fadeBKG() method.
		The fadeBKG(p, c, t, hex) method takes four arguments :
	 	p as integer - period between two colors in millisecond (the first period in a tweening mode)
		c as float or integer - tweening coefficient (1 for a linear fading, more than 1 for a increase tweening, les decrease tweening)
		t as integer  - threshold of tolerance between two colors ( a number between 1 and 255 ) 
		hex as color  - the hexadecimal color value (ex. red is 0xFF0000, blue is 0x0000FF, and so on)
*/



var fade = false;
var tRefresh, tPeriod, tCoef;

var BKGcol = new Color(this);
var threshold, fromRGB, toRGB;

/* ---------------------------- functions ---------------------------- */

function drawBKG(hex, rect) {
	fromRGB = hexToRGB(hex);
	with (this) {
		beginFill(hex, 100);
		moveTo(rect[0], rect[1]); lineTo(rect[2], rect[1]); lineTo(rect[2], rect[3]); lineTo(rect[0], rect[3]);
		endFill();
	}
}
function hexToRGB(hex) {
	hex = hex.toString(16); if (hex==0) { hex="000000" }
	r = parseInt("0x"+ hex.substring(0, 2));
	g = parseInt("0x"+ hex.substring(2, 4));
	b = parseInt("0x"+ hex.substring(4, 6));
	return new Array(r, g, b);
}
function redraw() { with(this) { _x = 0; _y = 0; _width = Stage.width; _height = Stage.height; } }
function fadeBKG(p, c, t, hex) { tPeriod = p; tCoef = c; tRefresh = getTimer() + tPeriod; threshold = t; toRGB = hexToRGB(hex); fade = true; }

/* ------------------------------ events ------------------------------ */

this.onEnterFrame = function() {
	if (fade && (tRefresh <= getTimer())) {
		for(i=0; i<3; i++) {
			num = Math.round(Math.abs(toRGB[i]-fromRGB[i]) /2);
			prop = Math.min(threshold, num);
			if (fromRGB[i] > toRGB[i]) { prop = - prop; }
			fromRGB[i] = Math.max(Math.min(fromRGB[i] + prop, 255), 0);
		}
		rgb = ( fromRGB[0] << 16 | fromRGB[1] << 8 | fromRGB[2]);
		BKGcol.setRGB(rgb);
		if (fromRGB[0] == toRGB[0] && fromRGB[1] == toRGB[1] && fromRGB[2] == toRGB[2]) { fade = false; }
		else {
			tPeriod = Math.floor(tPeriod / tCoef);
			tRefresh  = getTimer() + tPeriod;
		}
	}
}