Collisions kind of working

src/game/Game/BallSystem.cpp

@@ -0,0 +1,72 @@
+#include "PrecompiledHeader.h"
+#include "Game/BallSystem.h"
+
+dd::Systems::BallSystem::~BallSystem() {
+
+}
+
+void dd::Systems::BallSystem::RegisterComponents(ComponentFactory *cf)
+{
+
+}
+
+void dd::Systems::BallSystem::Initialize()
+{
+
+    EVENT_SUBSCRIBE_MEMBER(m_Contact, BallSystem::Contact);
+}
+
+void dd::Systems::BallSystem::Update(double dt)
+{
+
+}
+
+void dd::Systems::BallSystem::UpdateEntity(double dt, EntityID entity, EntityID parent)
+{
+
+}
+
+void dd::Systems::BallSystem::OnEntityCommit(EntityID entity)
+{
+
+}
+
+void dd::Systems::BallSystem::OnEntityRemoved(EntityID entity)
+{
+
+}
+
+bool dd::Systems::BallSystem::Contact(const Events::Contact &event)
+{
+    auto ballComponent1 = m_World->GetComponent<Components::Ball>(event.Entity1);
+    auto ballComponent2 = m_World->GetComponent<Components::Ball>(event.Entity2);
+
+    //Which is the ball?
+    EntityID ballEntity, otherEntitiy;
+    glm::vec2 normal;
+    if (ballComponent1 != nullptr) {
+        ballEntity = event.Entity1;
+        otherEntitiy = event.Entity2;
+
+        //Make normal point from the other entity to the ball
+        normal = event.Normal * -1.f;
+    }
+    else if (ballComponent2 != nullptr) {
+        ballEntity = event.Entity2;
+        otherEntitiy = event.Entity1;
+
+        //Make normal point from the other entity to the ball
+        normal = event.Normal * 1.f;
+    }
+
+    auto ballTransform = m_World->GetComponent<Components::Transform>(ballEntity);
+    auto otherTransform = m_World->GetComponent<Components::Transform>(otherEntitiy);
+
+    glm::vec2 ballVelocity = glm::vec2(ballTransform->Velocity.x, ballTransform->Velocity.y);
+    glm::vec2 reflectedVelocity = ballVelocity - 2.f * glm::dot(ballVelocity, normal)*normal;
+    ballTransform->Velocity = glm::vec3(reflectedVelocity, 0.f);
+
+
+
+    return true;
+}