Hello,
I don't manage to use the member functions of a 2D/3D geometric kernel as listed on https://doc.cgal.org/latest/Kernel_23/classKernel.html . Maybe the problem arises from the fact that I do not fully understand what a concept, model etc is and especially how to make use of them in practice. To make my problem specific: I am working with the Exact_predicates_exact_constructions_kernel and want to (for example) compute the squared radius of the smallest orthogonal circle of two weighted points in 2D. In the reference manual I found: Compute_squared_radius_smallest_orthogonal_circle_2, a model of Kernel::ComputeSquaredRadiusSmallestOrthogonalCircle_2. But I was not able to use it. I tried CGAL::, CGAL::Exact_predicates_exact_constructions_kernel::, etc but the function is never found ("not a member of ..."). It would be very helpful if anybody could provide a minimum working example which makes use of the function. Thanks for your help, Kathi -- Sent from: http://cgal-discuss.949826.n4.nabble.com/ -- You are currently subscribed to cgal-discuss. To unsubscribe or access the archives, go to https://sympa.inria.fr/sympa/info/cgal-discuss |
Hello, You can read about concepts and models are here: https://doc.cgal.org/latest/Manual/tutorial_hello_world.html#intro_concept. In your case, Compute_squared_radius_smallest_orthogonal_circle_2 is indeed a model of the functor concept ComputeSquaredRadiusSmallestOrthogonalCircle__2, and it can be used as follows: typedef CGAL::Exact_predicates_exact_constructions_kernel EPECK; typedef EPECK::FT FT; typedef EPECK::Weighted_point_2 Weighted_point; typedef EPECK::Compute_squared_radius_smallest_orthogonal_circle_2 Smallest_circle; EPECK kernel; Weighted_point wp1, wp2; Smallest_circle sc = kernel.compute_squared_radius_smallest_orthogonal_circle_2_object(); FT result = sc(wp1, wp2); In general, kernel objects and functors are defined because there is a use for it, so if you can search the source code of CGAL to find out how they are used in practice. On 16/05/2018 11:51, Kathi wrote:
Hello, I don't manage to use the member functions of a 2D/3D geometric kernel as listed on https://doc.cgal.org/latest/Kernel_23/classKernel.html . Maybe the problem arises from the fact that I do not fully understand what a concept, model etc is and especially how to make use of them in practice. To make my problem specific: I am working with the Exact_predicates_exact_constructions_kernel and want to (for example) compute the squared radius of the smallest orthogonal circle of two weighted points in 2D. In the reference manual I found: Compute_squared_radius_smallest_orthogonal_circle_2, a model of Kernel::ComputeSquaredRadiusSmallestOrthogonalCircle_2. But I was not able to use it. I tried CGAL::, CGAL::Exact_predicates_exact_constructions_kernel::, etc but the function is never found ("not a member of ..."). It would be very helpful if anybody could provide a minimum working example which makes use of the function. Thanks for your help, Kathi -- Sent from: http://cgal-discuss.949826.n4.nabble.com/ |
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