toXML method Null safety

String toXML()

Convert the Svg structure to XML string

Implementation

String toXML() {
  var xml = '<?xml version="1.0" encoding="UTF-8" ?>\n'
      '<svg width="${roundPixelsOnly(width)}" height="${roundPixelsOnly(height)}" xmlns="$_xmlns">\n';
  if (fill != null) {
    children.insert(
        0,
        Rect(
            x: 0, y: 0, width: 100, height: 100, unit: Unit.per, fill: fill));
  }
  for (var c in children) {
    xml += '\t' + c.toXML() + '\n';
  }
  xml += '</svg>';
  return xml;
}