In Dark Basic Professional you only have to concern yourself with the first two in most cases. All media loaded is released automatically when you leave a Dark Basic Professional program. The first and second stages are very easy to visualise and can be coded in the following two steps. You must first create your setup stage:
rem TUT3A
rem Initial settings
sync on : sync rate 100
backdrop off : hide mouse
rem Load all media for game
gosub _load_game
rem Setup all objects for game
gosub _setup_game
You then create the main loop and any calls you will make over and over again to control the elements within your game:
rem TUT3B
rem Game loop
do
rem Control game elements
gosub _control_player
gosub _control_gunandbullet
gosub _control_enemies
rem Update screen
sync
rem End loop
loop
The last step is to create all the subroutines that the first two stages call. Subroutines are blocks of code you can jump to in order to execute instructions that achieve a subtask. A subtask could be something like loading the player, controlling the player, deleting the player and so on. It is easier to understand what a subroutine does when given a useful name:
rem TUT3C
_control_player:
return
_control_gunandbullet:
return
_control_enemies:
return
_control_stats:
return
_setup_game:
return
_load_game:
return
As you can see, each subroutine has a name that describes what it does. At the moment they are all empty and contain no code. Later on in the tutorial we shall fill these subroutines with commands.
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