Method AddGroup

core/graphics/shape/Group.cpp:129–134

}

xg::shape::Group *xg::shape::Group::AddGroup() {
    auto g = std::make_unique<xg::shape::Group>();
    xg::shape::Group *gp = g.get();
    this->AddElement(std::move(g));
    return gp;
}

void xg::shape::Group::UpdateAttribute(std::string attrName, double val) {
    if(attrName == "alpha") {