From a556b45abf18f1bd509daaf63b66b7d55e9fd291 Mon Sep 17 00:00:00 2001
From: jjesswan <jessica_wan@brown.edu>
Date: Mon, 22 Apr 2024 21:56:26 -0400
Subject: add engine version

---
 engine-ocean/Game/Systems/physicssystem.cpp | 72 +++++++++++++++++++++++++++++
 1 file changed, 72 insertions(+)
 create mode 100644 engine-ocean/Game/Systems/physicssystem.cpp

(limited to 'engine-ocean/Game/Systems/physicssystem.cpp')

diff --git a/engine-ocean/Game/Systems/physicssystem.cpp b/engine-ocean/Game/Systems/physicssystem.cpp
new file mode 100644
index 0000000..cd70933
--- /dev/null
+++ b/engine-ocean/Game/Systems/physicssystem.cpp
@@ -0,0 +1,72 @@
+#include "physicssystem.h"
+#include "Game/Components/TransformComponent.h"
+
+PhysicsSystem::PhysicsSystem(std::map<std::string, std::shared_ptr<GameObject>>& dynamic_gameobjects,
+                             std::map<std::string, BlackboardData>& global_blackboard,
+                             std::map<std::string, std::vector<std::shared_ptr<GameObject>>>& lootables) :
+    m_dynamic_gameobjects(dynamic_gameobjects),
+    m_global_blackboard(global_blackboard),
+    m_lootables(lootables)
+
+{
+
+}
+
+TransformComponent* PhysicsSystem::getTransform(std::shared_ptr<GameObject> &go){
+    return go->getComponent<TransformComponent>();
+}
+
+float PhysicsSystem::gravitySimulation(float &initial_v, double deltaTime, float snapshot_time, float gravity){
+    float t = deltaTime-snapshot_time;
+    float delta_y = initial_v*t + (.5f)*gravity*t*t;
+    return delta_y;
+}
+
+
+void PhysicsSystem::update(double deltaTime){
+    //std::cout << "physics" << std::endl;
+    float dt = deltaTime - snapshot_time;
+    snapshot_time = deltaTime;
+
+    for (auto &go : m_dynamic_gameobjects){
+        // player has its own physics
+        if (go.first != "player"){
+            // position
+            glm::vec3 m_pos = getTransform(go.second)->getPos();
+            getTransform(go.second)->old_pos = m_pos;
+
+            // effect it by gravity
+            m_pos.y += gravitySimulation(getTransform(go.second)->yVelocity, dt, 0, getTransform(go.second)->gravity);
+            getTransform(go.second)->yVelocity = getTransform(go.second)->yVelocity + getTransform(go.second)->gravity*(dt);
+
+            m_global_blackboard[go.first].locationData.setToPos = m_pos;
+            // store m_pos as estimated final_pos
+            getTransform(go.second)->estimated_final_pos = m_pos;
+        }
+    }
+
+//    for (auto &lootGroup : m_lootables){
+//        for (auto &loot : lootGroup.second){
+//            // position
+//            glm::vec3 m_pos = getTransform(loot)->getPos();
+//            getTransform(loot)->old_pos = m_pos;
+
+//            // effect it by gravity
+//            m_pos.y += gravitySimulation(getTransform(loot)->yVelocity, dt, 0, getTransform(loot)->gravity);
+//            getTransform(loot)->yVelocity = getTransform(loot)->yVelocity + getTransform(loot)->gravity*(dt);
+
+//            // store m_pos as estimated final_pos
+//            getTransform(loot)->estimated_final_pos = m_pos;
+//        }
+
+//    }
+
+}
+
+
+
+
+void PhysicsSystem::draw(){}
+void PhysicsSystem::scrollEvent(double distance){}
+void PhysicsSystem::mousePosEvent(double xpos, double ypos){}
+
-- 
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