- You should know how to program, this is not a programming tutorial.
- You should actively look at the game’s script code when learning to see concrete examples.
Hellbreaker’s scripting uses the AngelScript scripting language, and is built on top of Urho3D’s API. AngelScript is a statically typed and compiled language, similar to C++/C#.
You can learn more about AngelScript from AngelScript’s language documentation.
Urho3D’s scripting API:
Script files are automatically reloaded when they change. It helps make development faster by removing the need to restart a level.
The game will automatically scan
Data/Scripts/ non-recursively for
.as files, and will generate
#includes all of them.
A guideline for organizing you scripts is to place all of your scripts in a directory inside
/Data/Scripts/, and put a single script file in
/Data/Scripts/ to include your scripts.
You should use the same name for your include file and the directory, to minimize the chance for name collisions. For example:
The game’s script file is
Data/Scripts/Main.as, and it’s loaded when the game starts.
There are special script functions the game will automatically look for in all namespaces and execute:
void game_start_once()is called when the game loads the script for the first time, before
void game_start()is called when the game loads the script for the first time, and after a reload.
void game_stop()is called when the game shuts down.
void level_start()is called when a level starts, and after script reload.
void level_stop()is called when a level stops, and before script reload.
void level_start_once()is called when a level starts, before
void level_stop_once()is called when a level stops, after
An organization guideline is to use the same name for your namespace as you use for your scripts directory, to minimize the chance for name collisions.
Player class inherits from
Destructible, which inherits from
Damageable is used for things that can take damage.
Destructible is used for things that also have health and can die.
You can get the player’s inventory via
The inventory is a map from item names to item amounts. The game uses it for items like weapon ammo and door keys, and it can be used for other things too.
It has the following functions:
uint itemaccess an item by its name
void add_item(const String& item_type, const int amount)to add to the amount of an item
Player also have
WeaponSlots member, which contains the player’s weapons.
There are 0 to 9 available slots, and weapons that occupy the same slot are ordered by their position value.
Each script file used by ScriptInstance is a separate script module. Modules dont share code, except things that are declared shared, in which case it should only be defined once (don’t include it several times).
Any script that interacts with things from the main module should be part of it. Only if script are completely indepenent of the main module they can be used in a separate script module.
Editing script files
Atom is an open source text editor that has AngelScript syntax highlighting package.