Constants

Constants are values that are always the same when executed. An example of a constant would be 1, "Hello", etc. Constants can also be #define'd.

The syntax of defining a constant is as follows

#define NAME VALUE

Numbers

These constants can be used as values and also as script numbers

For example (This does compile)

#define SNUM 1
#define VAL 3131
script SNUM (void)
{
    int x = VAL;
}

Here SNUM would be replaced with 1 and VAL would be replaced with 3131.

This is useful for a constant that is used a lot. If something like the spawn numbers were to be changed, you'd only need to change the constant for the defined spawn numbers.

String Constants

You can define string constants as well.

1

script 1 open
{
    print(s:"err");
    print(s:"err");
}

2

#define STR_err "err"
script 1 open
{
    print(s:STR_err);
    print(s:STR_err);
}

Examples 1 and 2 produce identical output.

Library Constants

You can also place constants in your Libraries. This can be especially useful when, say, applying a TID to the player, or numbers you may want handy for custom functions.

The syntax is much the same as a normal constant, with one change.

#libdefine NAME VALUE

Here is an example of some constants I personally use. These constants provide quick shortcuts to cardinal directions for PolyObjects and SetActorAngle.

#libdefine POLY_UP 64
#libdefine POLY_DOWN 192
#libdefine POLY_LEFT 128
#libdefine POLY_RIGHT 0

#libdefine ACTOR_FACE_UP 0.25
#libdefine ACTOR_FACE_LEFT 0.5
#libdefine ACTOR_FACE_RIGHT 1.0
#libdefine ACTOR_FACE_DOWN 0.75