1 files changed, 66 insertions, 0 deletions
diff --git a/lib/c++/particle/geometry/circle.hpp b/lib/c++/particle/geometry/circle.hpp
new file mode 100644
index 0000000..331f06d
--- /dev/null
+++ b/lib/c++/particle/geometry/circle.hpp
@@ -0,0 +1,66 @@
+#pragma once
+
+#include "../particle.hpp"
+
+namespace kel {
+namespace lbm {
+
+template<typename T>
+class particle_circle_geometry {
+private:
+public:
+	particle_circle_geometry()
+	{}
+
+	template<typename MT = T>
+	saw::data<sch::ParticleMask<MT,2>> generate_mask(uint64_t resolution, uint64_t boundary_nodes = 0) const {
+		saw::data<sch::ParticleMask<MT,2>> mask;
+
+		auto& grid = mask.template get<"grid">();
+		auto& com = mask.template get<"center_of_mass">();
+		com = {};
+
+		//uint64_t rad_i = static_cast<uint64_t>(resolution * radius_.get())+1u;
+		uint64_t diameter_i = resolution;
+		uint64_t size = diameter_i + 2*boundary_nodes;
+		grid = {{{size,size}}};
+
+		saw::data<T> delta_x{static_cast<typename saw::native_data_type<T>::type>(2.0  / static_cast<double>(diameter_i))};
+		saw::data<T> center = (saw::data<T>{1.0} + saw::data<T>{2.0} * saw::data<T>{static_cast<saw::native_data_type<T>::type>(boundary_nodes)/diameter_i});
+
+		for(uint64_t i = 0; i < size; ++i){
+			for(uint64_t j = 0; j < size; ++j){
+				grid.at({{i,j}}).set(0);
+				if(i >= boundary_nodes and j >= boundary_nodes and i < (diameter_i + boundary_nodes) and j < (diameter_i + boundary_nodes) ){
+					saw::data<T> fi = saw::data<T>{static_cast<saw::native_data_type<T>::type>(0.5+i)} * delta_x - center;
+					saw::data<T> fj = saw::data<T>{static_cast<saw::native_data_type<T>::type>(0.5+j)} * delta_x - center;
+
+					auto norm_f_ij = fi*fi + fj*fj;
+					if(norm_f_ij.get() <= 1){
+						grid.at({{i,j}}).set(1);
+					}
+				}
+			}
+		}
+
+		saw::data<T> total_mass{};
+		iterate_over([&](const saw::data<sch::FixedArray<sch::UInt64,2u>>& index){
+			auto ind_vec = saw::math::vectorize_data(index).template cast_to<T>();
+			for(uint64_t i{0u}; i < 2u; ++i){
+				ind_vec.at({{i}}) = ind_vec.at({{i}}) * grid.at(index);
+			}
+			com = com + ind_vec;
+
+			total_mass = total_mass + grid.at(index);
+		},{{0u,0u}}, grid.dims());
+
+		for(uint64_t i{0u}; i < 2u; ++i){
+			com.at({{i}}) = com.at({{i}}) / total_mass;
+		}
+
+		return mask;
+	}
+};
+
+}
+}