// copyright 2009 Laura Shaffer Mills

// set up "onload" to initialize
window.onload = function()
{
	initialize();
	initializeImages("spotlights",".gif");

	sizeDiv("spotlights");		// adjust the div size if necessary
	drawClock("spotlights");		// draw the spotlights
}			// window.onload()


// paint the combination color in center, based on color sources "on"
function paintColor() {
	var centerLight = document.getElementById("lightcolor");
	var colorList = new Array;
	var numColors = 0;				// number of color sources "on"
	var newColor = 0x000000;		// default to black if nothing

	// find color sources that are on
	for (var i = 0; i < 12; i++) {
		if (gColorSources.isOn[i] > 0) {		// is it currently on?
			colorList[numColors++] = gColorSources.colors[i];		// add to my list of colors
		}
	}
	if (0 != numColors) {		// calculate color combination
		var red = 0; green = 0; blue = 0;
		var maxValue = 0;

		// add component parts (red, green, and blue) for each color
		for (var i = 0; i < numColors; i++) {
			red += (colorList[i] >> 16) & 0xff;
			green += (colorList[i] >> 8) & 0xff;
			blue += colorList[i] & 0xff;
		}

		// make the largest into "ff" at the most
		maxValue = Math.max( Math.max(red,green), blue );
		if (maxValue > 0xff) {
			var percent = 0xff / maxValue;
			red *= percent;
			green *= percent;
			blue *= percent;
			// set maximum values
			if (red > 0xff)
				red = 0xff;
			if (green > 0xff)
				green = 0xff;
			if (blue > 0xff)
				blue = 0xff;
		}
		newColor = (parseInt(red,10) << 16) + (parseInt(green,10) << 8) + parseInt(blue,10);
	}			// calculating color combination

	// paint color
	var temp = newColor.toString(16);
	var oldLength = temp.length;
	// now add leading zeros if needed
	if (temp.length < 6) {
		for (var i = 0; i < (6 - oldLength); i++)
			temp = "0" + temp;
	}
	// paint it
	centerLight.style.backgroundColor = "#" + temp;
}			// paintColor()