public IBoundingBox BoundingBox()
{
var bbList = new List <IBoundingBox>();
foreach (DwgEntity entity in Entities)
{
if (entity is Line3)
{
Line3 line = entity as Line3;
bbList.Add(line.BoundingBox());
}
if (entity is Arc)
{
Arc arc = entity as Arc;
bbList.Add(arc.BoundingBox());
}
if (entity is Vector3)
{
Vector3 pt = entity as Vector3;
bbList.Add(pt.BoundingBox());
}
}
return(BoundingBoxBuilder.Union(bbList));
}
