CL_Line2f::CL_Line2f(); CL_Line2f::CL_Line2f( const CL_Line2x < at > pampamp; copy); CL_Line2f::CL_Line2f( const CL_Vec2 < at > pampamp; point_p, const CL_Vec2 < at > pampamp; point_q); CL_Line2f::CL_Line2f( const CL_Vec2 < at > pampamp; point_p, float gradient);