问显示完整的SVG和完整的缩放

EN

    serializeSvg: function() {
        /**
         * serialize a xml object to string
         * @param {type} xmlNode the node to use
         * @returns {String|@exp;xmlNode@pro;xml|@exp;window@pro;XMLSerializer@call;@call;serializeToString}
         */
        function serializeXmlNode(xmlNode) {
            if (typeof window.XMLSerializer !== 'undefined') {
                return (new window.XMLSerializer()).serializeToString(xmlNode);
            } else if (typeof xmlNode.xml !== 'undefined') {
                return xmlNode.xml;
            }

            return '';
        }

        var svg = serializeXmlNode(document.getElementsByTagName('svg')[0]),
            factor = 2;
        svg = '<svg'
                + ' xmlns="http://www.w3.org/2000/svg"' // xml namespace
                + ' version="1.1"'
                + ' xmlns:xlink="http://www.w3.org/1999/xlink"' // for images
                + ' ' + svg.substring(svg.indexOf('<svg ') + 5);

        // highcharts svg sanitizer
        svg = svg.replace(/width="([^"]+)"/, function(m, width) {
                return 'width="' + (width * factor) + '"';
            }).replace(/height="([^"]+)"/, function(m, height) {
                return 'height="' + (height * factor) + '"';
            }).replace(/<rect class="drag"[^<]+<\/rect>/, '')

            // IE specific
            .replace(/<IMG /g, '<image ')
            .replace(/height=([^" ]+)/g, 'height="$1"')
            .replace(/width=([^" ]+)/g, 'width="$1"')
            .replace(/id=([^" >]+)/g, 'id="$1"')
            .replace(/class=([^" ]+)/g, 'class="$1"')
            .replace(/ transform /g, ' ')
            .replace(/:(path|rect)/g, '$1')
            .replace(/style="([^"]+)"/g, function(s) {
                    return s.toLowerCase();
            });

        return svg;
    }

var layout = d3.layout.force();
var DEFAULT_SIZE = 64;
var GROWTH_SCALE = 1.15;
var SHRINK_SCALE = 1.05;

// creates a new force layout
var force = layout
    .size([w, h])
    .gravity(.06)
    .distance(110)
    //.friction(0.6)
    //.linkStrength(0.4)
    .charge(-((DEFAULT_SIZE * GROWTH_SCALE) * 10))
    .on('tick', tick);

// creates the svg context
var svg = d3.select('.la-container').append('svg:svg')
    .attr('width', w)
    .attr('height', h)
    .attr('pointer-events', 'all') // set for the pan/zooming
    .append('svg:g') // add a g element for capturing zoom and pan
      .call(d3.behavior.zoom().scaleExtent([0.6, 6.0]).on('zoom', redraw))
    .append('svg:g');

svg.append('svg:rect')
    .attr('class', 'drag')
    .attr('width', w)
    .attr('height', h)
    .attr('fill', 'white');