Function extractElementData

chapter24/docs/d3-graphviz.js:73–170

(element)

  }

  function extractElementData(element) {
    var datum = {};
    var tag = element.node().nodeName;
    datum.tag = tag;
    if (tag == '#text') {
      datum.text = element.text();
    } else if (tag == '#comment') {
      datum.comment = element.text();
    }
    datum.attributes = {};
    var attributes = element.node().attributes;
    if (attributes) {
      for (var i = 0; i < attributes.length; i++) {
        var attribute = attributes[i];
        var name = attribute.name;
        var value = attribute.value;
        datum.attributes[name] = value;
      }
    }
    var transform = element.node().transform;
    if (transform && transform.baseVal.numberOfItems != 0) {
      var matrix = transform.baseVal.consolidate().matrix;
      datum.translation = {
        x: matrix.e,
        y: matrix.f
      };
      datum.scale = matrix.a;
    }
    if (tag == 'ellipse') {
      datum.center = {
        x: datum.attributes.cx,
        y: datum.attributes.cy
      };
    }
    if (tag == 'polygon') {
      var points = element.attr('points').split(' ');
      var x = points.map(function (p) {
        return p.split(',')[0];
      });
      var y = points.map(function (p) {
        return p.split(',')[1];
      });
      var xmin = Math.min.apply(null, x);
      var xmax = Math.max.apply(null, x);
      var ymin = Math.min.apply(null, y);
      var ymax = Math.max.apply(null, y);
      var bbox = {
        x: xmin,
        y: ymin,
        width: xmax - xmin,
        height: ymax - ymin
      };
      datum.bbox = bbox;
      datum.center = {
        x: (xmin + xmax) / 2,
        y: (ymin + ymax) / 2
      };
    }