- void set_split_tangent_flag(bool x=true) { link_radius_=link_theta_=!x; normalize();}
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- const bool& get_link_radius_flag()const { return link_radius_; }
- void set_link_radius_flag(bool x=true) { link_radius_=x; normalize();}
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- const bool& get_link_theta_flag()const { return link_theta_; }
- void set_link_theta_flag(bool x=true) { link_theta_=x; normalize();}
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- //normalize tangents, i.e. make sure their values correspond to the linkage
- void normalize(int i=0);