Function V

packages/joint-core/src/V/index.mjs:39–106

(el, attrs, children)

    var sin = math.sin;

    var V = function(el, attrs, children) {

        // This allows using V() without the new keyword.
        if (!(this instanceof V)) {
            return V.apply(Object.create(V.prototype), arguments);
        }

        if (!el) return;

        if (V.isV(el)) {
            el = el.node;
        }

        attrs = attrs || {};

        if (V.isString(el)) {

            el = el.trim();

            if (el.toLowerCase() === 'svg') {

                // Create a new SVG canvas.
                el = V.createSvgDocument();

            } else if (el[0] === '<') {

                // Create element from an SVG string.
                // Allows constructs of type: `document.appendChild(V('<rect></rect>').node)`.

                var svgDoc = V.createSvgDocument(el);

                // Note that `V()` might also return an array should the SVG string passed as
                // the first argument contain more than one root element.
                if (svgDoc.childNodes.length > 1) {

                    // Map child nodes to `V`s.
                    var arrayOfVels = [];
                    var i, len;

                    for (i = 0, len = svgDoc.childNodes.length; i < len; i++) {

                        var childNode = svgDoc.childNodes[i];
                        arrayOfVels.push(new V(document.importNode(childNode, true)));
                    }

                    return arrayOfVels;
                }

                el = document.importNode(svgDoc.firstChild, true);

            } else {

                el = createSVGElement(el);
            }

            V.ensureId(el);
        }