import * as Browser from '../../core/Browser';

// @namespace SVG; @section
// There are several static functions which can be called without instantiating L.SVG:

// @function create(name: String): SVGElement
// Returns a instance of [SVGElement](https://developer.mozilla.org/docs/Web/API/SVGElement),
// corresponding to the class name passed. For example, using 'line' will return
// an instance of [SVGLineElement](https://developer.mozilla.org/docs/Web/API/SVGLineElement).
export function svgCreate(name) {
	return document.createElementNS('http://www.w3.org/2000/svg', name);
}

// @function pointsToPath(rings: Point[], closed: Boolean): String
// Generates a SVG path string for multiple rings, with each ring turning
// into "M..L..L.." instructions
export function pointsToPath(rings, closed) {
	var str = '',
	i, j, len, len2, points, p;

	for (i = 0, len = rings.length; i < len; i++) {
		points = rings[i];

		for (j = 0, len2 = points.length; j < len2; j++) {
			p = points[j];
			str += (j ? 'L' : 'M') + p.x + ' ' + p.y;
		}

		// closes the ring for polygons; "x" is VML syntax
		str += closed ? (Browser.svg ? 'z' : 'x') : '';
	}

	// SVG complains about empty path strings
	return str || 'M0 0';
}