RigidBody.h:

* Turning RigidBody struct into a class and privatizing the data members.
* Adding velocity and acceleration which update the position in the update() function.

Dynamics/DynamicsSystem.h

@@ -21,16 +21,16 @@ namespace dynamics
 
   public:
 
-    RigidBody* add_rigid_body(Sprite* sprite)
+    RigidBody* add_rigid_body(Sprite* sprite, const Vec2& vel = {}, const Vec2& acc = {})
     {
-      auto& rb = m_rigid_bodies.emplace_back(std::make_unique<RigidBody>());
-      rb->init_from_sprite(sprite);
+      auto& rb = m_rigid_bodies.emplace_back(std::make_unique<RigidBody>(sprite, vel, acc));
       return rb.get();
     }
 
-    void update()
+    void update(float dt, int sim_frame)
     {
-
+      for (auto& rb : m_rigid_bodies)
+        rb->update(dt, sim_frame);
     }
   };
 

Dynamics/RigidBody.h

@@ -14,28 +14,36 @@
 namespace dynamics
 {
 
-  struct RigidBody
+  class RigidBody
   {
     AABB<float> curr_aabb;
     Vec2 orig_pos;
-    Vec2 curr_centroid;
     Vec2 centroid_to_orig_pos;
 
+    Vec2 curr_centroid;
+    Vec2 curr_vel;
+    Vec2 curr_acc;
+
     Sprite* sprite = nullptr; // Position to be controlled by this rigid body object.
 
-    void init_from_sprite(Sprite* s)
+  public:
+    RigidBody(Sprite* s, const Vec2& vel = {}, const Vec2& acc = {})
     {
       sprite = s;
       orig_pos = s->pos;
       curr_aabb = s->calc_curr_AABB(0).convert<float>();
       curr_centroid = s->calc_curr_centroid(0);
       centroid_to_orig_pos = orig_pos - curr_centroid;
+      curr_vel = vel;
+      curr_acc = acc;
     }
 
-    void update(int sim_frame)
+    void update(float dt, int sim_frame)
     {
       if (sprite != nullptr)
       {
+        curr_vel += curr_acc * dt;
+        curr_centroid += curr_vel * dt;
         //sprite->pos = curr_pos.to_RC_round();
         sprite->pos = (curr_centroid + centroid_to_orig_pos).to_RC_round();
         curr_aabb = sprite->calc_curr_AABB(sim_frame).convert<float>();