From b1d61c67c28a9ba4a1de834e401d97cfc9e84764 Mon Sep 17 00:00:00 2001
From: "Claudius \"keldu\" Holeksa" <mail@keldu.de>
Date: Sun, 21 Dec 2025 20:53:50 +0100
Subject: Reworking some structures. adding particle tests again

---
 lib/core/tests/particles.cpp | 171 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 171 insertions(+)
 create mode 100644 lib/core/tests/particles.cpp

(limited to 'lib/core/tests/particles.cpp')

diff --git a/lib/core/tests/particles.cpp b/lib/core/tests/particles.cpp
new file mode 100644
index 0000000..0806375
--- /dev/null
+++ b/lib/core/tests/particles.cpp
@@ -0,0 +1,171 @@
+#include <forstio/test/suite.hpp>
+
+#include <iostream>
+//#include "../c++/particle/geometry/circle.hpp"
+#include "../c++/particle/particle.hpp"
+#include <forstio/codec/data.hpp>
+
+namespace {
+namespace sch {
+using namespace kel::lbm::sch;
+
+using T = Float64;
+}
+SAW_TEST("Verlet step 2D - Planar"){
+	using namespace kel;
+
+	saw::data<sch::Particle<sch::T,2u>> particle;
+	auto& body = particle.template get<"rigid_body">();
+	auto& pos = body.template get<"position">();
+	auto& pos_old = body.template get<"position_old">();
+
+	// auto& rot = body.template get<"rotation">();
+	auto& acc = body.template get<"acceleration">();
+
+	acc.at({{0}}).set({1.0});
+
+	lbm::verlet_step_lambda<sch::T,2u>(particle,{0.5});
+
+	SAW_EXPECT(pos.at({{0}}).get() == 0.25, std::string{"Incorrect Pos X: "} + std::to_string(pos.at({{0}}).get()));
+	SAW_EXPECT(pos.at({{1}}).get() == 0.0, std::string{"Incorrect Pos Y: "} + std::to_string(pos.at({{1}}).get()));
+}
+
+SAW_TEST("No Collision Spheroid 2D"){
+	using namespace kel;
+
+	saw::data<sch::Particle<sch::T,2u>> part_a;
+	{
+		auto& body = part_a.template get<"rigid_body">();
+		auto& pos = body.template get<"position">();
+		auto& coll = part_a.template get<"collision">();
+		auto& radius = coll.template get<"radius">();
+
+		radius.set(1.0);
+
+		pos.at({{0u}}) = 0.1;
+		pos.at({{1u}}) = 0.2;
+
+	}
+	saw::data<sch::Particle<sch::T,2u>> part_b;
+	{
+		auto& body = part_b.template get<"rigid_body">();
+		auto& pos = body.template get<"position">();
+		auto& coll = part_b.template get<"collision">();
+		auto& radius = coll.template get<"radius">();
+
+		radius.set(1.0);
+		
+		pos.at({{0u}}) = -2.1;
+		pos.at({{1u}}) = 0.0;
+	}
+
+	bool have_collided = lbm::broadphase_collision_check<sch::T,2u>(part_a,part_b);
+	SAW_EXPECT(not have_collided, "Particles shouldn't collide");
+}
+
+SAW_TEST("Collision Spheroid 2D"){
+	using namespace kel;
+
+	saw::data<sch::Particle<sch::T,2u>> part_a;
+	{
+		auto& body = part_a.template get<"rigid_body">();
+		auto& pos = body.template get<"position">();
+		auto& coll = part_a.template get<"collision">();
+		auto& radius = coll.template get<"radius">();
+
+		radius.set(1.0);
+
+		pos.at({{0u}}) = 0.1;
+		pos.at({{1u}}) = 0.2;
+
+	}
+	saw::data<sch::Particle<sch::T,2u>> part_b;
+	{
+		auto& body = part_b.template get<"rigid_body">();
+		auto& pos = body.template get<"position">();
+		auto& coll = part_b.template get<"collision">();
+		auto& radius = coll.template get<"radius">();
+
+		radius.set(1.0);
+		
+		pos.at({{0u}}) = -1.5;
+		pos.at({{1u}}) = 0.0;
+	}
+
+	bool have_collided = lbm::broadphase_collision_check<sch::T,2u>(part_a,part_b);
+	SAW_EXPECT(have_collided, "Particles should collide");
+}
+
+/*
+SAW_TEST("Minor Test for mask"){
+	using namespace kel;
+
+	lbm::particle_circle_geometry<sch::T> geo;
+
+	auto mask = geo.generate_mask<sch::T>(9u,1u);
+
+	auto& grid = mask.template get<"grid">();
+
+	for(saw::data<sch::UInt64> i{0u}; i < grid.template get_dim_size<0>(); ++i){
+		for(saw::data<sch::UInt64> j{0u}; j < grid.template get_dim_size<1>(); ++j){
+			std::cout<<grid.at({{i,j}}).get()<<" ";
+		}
+		std::cout<<"\n";
+	}
+	std::cout<<std::endl;
+
+	//saw::data<sch::Array<sch::T,2>> reference_mask{{{4+2,4+2}}};
+	//reference_mask.at({{0,0}});
+}
+*/
+/*
+SAW_TEST("Verlet integration test 2D"){
+	using namespace kel;
+	lbm::particle_system<sch::T,2,sch::Particle<sch::T,2>> system;
+
+	{
+		saw::data<sch::Particle<sch::T,2>> particle;
+		auto& rb = particle.template get<"rigid_body">();
+		auto& acc = rb.template get<"acceleration">();
+		auto& pos = rb.template get<"position">();
+		auto& pos_old = rb.template get<"position_old">();
+		pos = {{1e-1,1e-1}};
+		pos_old = {{0.0, 0.0}};
+		acc = {{0.0,-1e1}};
+
+		auto eov = system.add_particle(std::move(particle));
+		SAW_EXPECT(eov.is_value(), "Expected no error :)");
+	}
+	{
+		auto& p = system.at({0u});
+		auto& rb = p.template get<"rigid_body">();
+		auto& pos = rb.template get<"position">();
+
+		for(saw::data<sch::UInt64> i{0u}; i < saw::data<sch::UInt64>{2u}; ++i){
+			std::cout<<pos.at(i).get()<<" ";
+		}
+		std::cout<<std::endl;
+	}
+
+	for(uint64_t i = 0u; i < 36u; ++i){
+		system.step(saw::data<sch::T>{1e-1});
+
+		{
+			auto& p = system.at({0u});
+			auto& rb = p.template get<"rigid_body">();
+			auto& pos = rb.template get<"position">();
+
+			for(saw::data<sch::UInt64> i{0u}; i < saw::data<sch::UInt64>{2u}; ++i){
+				std::cout<<pos.at(i).get()<<" ";
+			}
+			std::cout<<"\n";
+
+			if(pos.at({1u}).get() < 0.0){
+				break;
+			}
+		}
+
+	}
+}
+*/
+}
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