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This tutorial is for adding a scene event to a map. We'll be Using Azalea Gym as an example.
## Contents
1. [Define SceneID in WRAM](#1-define-sceneid-in-wram)
2. [Define scene_var](#2-define-scene_var)
3. [Define the Scene](#3-define-the-scene)
4. [Add the Scene to Azalea Gym](#4-add-the-scene-to-azalea-gym)
## 1. Define SceneID in WRAM
Azalea Town Doesn't have a SceneID yet, so we need to define it. Edit [wram.asm](../blob/master/wram.asm):
```diff
INCLUDE "constants.asm"
INCLUDE "macros/wram.asm"
...
wMobileTradeRoomSceneID:: db ; d9bf
wMobileBattleRoomSceneID:: db ; d9c0
+wAzaleaGymSceneID:: db ; d9c1
- ds 49
+ ds 48
```
If you add more Scene Ids in the future you'll have to decrement the number after `ds` accordingly
## 2. Define scene_var
Edit [data/maps/scenes.asm](../blob/master/data/maps/scenes.asm):
```diff
scene_var: MACRO
; map, variable
...
scene_var MOBILE_BATTLE_ROOM, wMobileBattleRoomSceneID
+ scene_var AZALEA_GYM, wAzaleaGymSceneID
db -1 ; end
```
## 3. Define the scene
Edit [constants/scene_constants.asm](../blob/master/constants/scene_constants.asm):
```diff
; See data/maps/scenes.asm for which maps have scene variables.
; Each scene_script and coord_event is associated with a current scene ID.
...
; wFastShip1FSceneID
const_def 1
const SCENE_FASTSHIP1F_ENTER_SHIP ; 1
const SCENE_FASTSHIP1F_MEET_GRANDPA ; 2
+; wAzaleaGymSceneID
+ const_def
+ const SCENE_AZALEAGYM_NOTHING
+ const SCENE_AZALEAGYM_SCENE
```
## 4. Add the Scene to Azalea Gym
Edit [maps/AzaleaGym.asm](../blob/master/maps/AzaleaGym.asm):
```diff
object_const_def ; object_event constants
const AZALEAGYM_BUGSY
...
AzaleaGym_MapScripts:
def_scene_scripts
+ scene_script .DummyScene0 ; SCENE_AZALEAGYM_NOTHING
+ scene_script .DummyScene1 ; SCENE_AZALEAGYM_SCENE
def_callbacks
+.DummyScene0
+.DummyScene1
+ end
```
(Before August 2020, maps did not have `def_*` macros, so they had to manually declare their quantities of `scene_script`s, `callback`s, etc. So instead of `def_scene_scripts` they used to have `db 0 ; scene scripts`, which you would change here to `db 2`.)
That's it! Now you can use these scenes for a Coord event.
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