From 54b01b0d945f62c076434077dcb6d7ac5cfffca5 Mon Sep 17 00:00:00 2001
From: Kazhnuz <antoine@sortilege.net>
Date: Sun, 16 Jun 2019 10:08:59 +0200
Subject: [PATCH] feat(world): add a creationID variable to keep track of
 actors ID

---
 CHANGELOG.md                         | 2 ++
 gamecore/modules/world/baseworld.lua | 3 +++
 gamecore/modules/world/world2D.lua   | 5 ++++-
 3 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3da99d1..12319ae 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -27,6 +27,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - **world:** Support batching actor loading
 
+- **world:** Add `Actor.creationID` to keep the order in which actors have been created
+
 ### Changed
 
 - **world:** automatize world integration in a scene
diff --git a/gamecore/modules/world/baseworld.lua b/gamecore/modules/world/baseworld.lua
index a1f0ee1..ded38f0 100644
--- a/gamecore/modules/world/baseworld.lua
+++ b/gamecore/modules/world/baseworld.lua
@@ -84,6 +84,7 @@ end
 
 function BaseWorld:initActors( )
   self.actors = {}
+  self.currentCreationID = 0
 end
 
 function BaseWorld:newActor(name, x, y)
@@ -95,6 +96,8 @@ function BaseWorld:newCollision(name, x, y, w, h)
 end
 
 function BaseWorld:registerActor(actor)
+  actor.creationID = self.currentCreationID
+  self.currentCreationID = self.currentCreationID + 1
   table.insert(self.actors, actor)
 end
 
diff --git a/gamecore/modules/world/world2D.lua b/gamecore/modules/world/world2D.lua
index d63b074..7375c46 100644
--- a/gamecore/modules/world/world2D.lua
+++ b/gamecore/modules/world/world2D.lua
@@ -38,10 +38,13 @@ end
 -- Wrappers around Bump2D functions
 
 function World2D:initActors()
-  self.actors   = Bump.newWorld(50)
+  self.currentCreationID  = 0
+  self.actors = Bump.newWorld(50)
 end
 
 function World2D:registerActor(actor)
+  actor.creationID        = self.currentCreationID
+  self.currentCreationID  = self.currentCreationID + 1
   return self.actors:add(actor, actor.x, actor.y, actor.w, actor.h)
 end