Remember previous positions

src/karts/kart.cpp

@@ -147,6 +147,12 @@ Kart::Kart (const std::string& ident, unsigned int world_kart_id,
     m_boosted_ai           = false;
     m_type                 = RaceManager::KT_AI;
 
+    for (int i=0;i<30;i++)
+    {
+        m_previous_xyz[i] = getXYZ();
+    }
+    time_previous_counter = 0.0f;
+
     m_view_blocked_by_plunger = 0;
     m_has_caught_nolok_bubblegum = false;
 
@@ -370,6 +376,12 @@ void Kart::reset()
     m_has_caught_nolok_bubblegum = false;
     m_is_jumping           = false;
 
+    for (int i=0;i<30;i++)
+    {
+        m_previous_xyz[i] = getXYZ();
+    }
+    time_previous_counter = 0.0f;
+
     // In case that the kart was in the air, in which case its
     // linear damping is 0
     if(m_body)
@@ -1278,9 +1290,22 @@ void Kart::update(float dt)
     {
         m_kart_animation->update(dt);
     }
+
+    time_previous_counter += dt;
+    while (time_previous_counter > (1.0f/120.0f))
+    {
+        m_previous_xyz[0] = getXYZ();
+        for (int i=29;i>0;i--)
+        {
+            m_previous_xyz[i] = m_previous_xyz[i-1];
+        }
+        time_previous_counter -= (1.0f/120.0f);
+    }
+
     // Update the position and other data taken from the physics (or
     // an animation which calls setXYZ(), which also updates the kart
     // physical position).
+
     Moveable::update(dt);
 
     Vec3 front(0, 0, getKartLength()*0.5f);
@@ -3050,6 +3075,14 @@ const Vec3& Kart::getNormal() const
     return m_terrain_info->getNormal();
 }   // getNormal
 
+// ------------------------------------------------------------------------
+/** Returns the position 0,25s before */
+const Vec3& Kart::getPreviousXYZ() const
+{
+    return m_previous_xyz[29];
+}   // getPreviousXYZ
+
+
 // ------------------------------------------------------------------------
 void Kart::playSound(SFXBuffer* buffer)
 {