/*****
*
*   SVGUtil.es
*
*   Author: Antoine Quint
*
*****/

SVGUtil.VERSION = 0.1;

function SVGUtil () {};


/*****  Namespaces  *****/

SVGUtil.NS = {
	SVG: 'http://www.w3.org/2000/svg',
	XLink: 'http://www.w3.org/1999/xlink',
	XMLEvents: 'http://www.w3.org/2001/xml-events',
	XForms: 'www.w3.org/2002/01/xforms',
	FUI: 'http://xmlns.fuchsia-design.com/ui/'
};


/*****  SVG DOM routines  *****/

SVGUtil.CreateElement = function (name, attributes) {
	var str;
	if (arguments.length == 1) {
		str = '<' + name + ' xmlns="http://www.w3.org/2000/svg" />';
	} else if (arguments.length == 2) {
		var xmlStr = '';
		if (attributes.xml) {
			for (var i=0; i<attributes.xml.length; i++) {
				var attr = attributes.xml[i];
				xmlStr += attr[0] + '="' + attr[1] + '" ';
			}
		}
		if (attributes.css) {
			var cssStr = 'style="';
			for (var i=0; i<attributes.css.length; i++) {
				var prop = attributes.css[i];
				cssStr += prop[0] + ': ' + prop[1] + ';';
			}
			xmlStr += cssStr + '" ';
		}
		str = '<' + name + ' ' + xmlStr + ' xmlns="http://www.w3.org/2000/svg" />';
	}
	var fragment = parseXML(str, document);
	return fragment;
};

SVGUtil.CreateSVGPoint = function (x,y) {
	var p = document.documentElement.createSVGPoint();
	p.x = x;
	p.y = y;
	return p;
};

SVGUtil.CreateSVGRect = function (x,y,w,h) {
	return {
		x: x,
		y: y,
		width: w,
		height: h
	};
};

SVGUtil.InsertAfter = function (newChild, refChild) {
	refChild.parentNode.insertBefore( newChild, (refChild?refChild.nextSibling:parent.firstChild) );
};


/*****  Mouse Methods  *****/

SVGUtil.GetClientMouseCoords = function (e) {
	return this.CreateSVGPoint(e.clientX, e.clientY);
};

SVGUtil.GetMouseCoordsInContext = function (e, context) {
	var c = this.GetClientMouseCoords(e);
	var m = context.getScreenCTM().inverse();
	return c.matrixTransform(m);
};


/*****  Bounding Box Methods  *****/

SVGUtil.GetBBox = function (elem) {
	var m = elem.getScreenCTM();
	return this._ComputeBBox(m, elem);
};

SVGUtil.GetBBoxInContext = function (elem, context) {
	var m = elem.getTransformToElement(context);
	return this._ComputeBBox(m, elem);
};

SVGUtil._ComputeBBox = function (m, elem) {
	var box;
	if (elem.shadowTree) {
		box = elem.shadowTree.getBBox();
	} else {
		box = elem.getBBox();
	}
	var corners = [];
	var point = this.CreateSVGPoint(box.x, box.y);
	corners.push( point.matrixTransform(m) );
	point.x = box.x + box.width;
	point.y = box.y;
	corners.push( point.matrixTransform(m) );
	point.x = box.x + box.width;
	point.y = box.y + box.height;
	corners.push( point.matrixTransform(m) );
	point.x = box.x;
	point.y = box.y + box.height;
	corners.push( point.matrixTransform(m) );
	var max = this.CreateSVGPoint(corners[0].x, corners[0].y);
	var min = this.CreateSVGPoint(corners[0].x, corners[0].y);
	for (var i = 1; i < corners.length; i++) {
		var x = corners[i].x;
		var y = corners[i].y;
		if (x < min.x) {
			min.x = x;
		} else if (x > max.x) {
			max.x = x;
		}
		if (y < min.y) {
			min.y = y;
		} else if (y > max.y) {
			max.y = y;
		}
	}
	return this.CreateSVGRect(min.x, min.y, max.x - min.x, max.y - min.y);
};