ZScript variables

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Note: This feature is for ZScript only.

ZScript introduces a variety of new variables usable within actors, including structs. These must be defined either inside regular/anonymous functions, or outside the Default {} block, which is used for an Actor class's internal properties only.

Types

The following types are available for classes:

  • Arithmetic (bool, int, double, float)
  • NOTE: There is a difference between double and float. Type double is encouraged over float due to precision loss with the latter.
  • Strings
  • Encompassed with double quotes (" "). Case sensitive. Strings are simply compared with <, >, <=, >=, ==, ~== operators.
  • ~== is a case insensitive version of ==.
  • Names
  • Encompassed with single quotes (' '). Not case sensitive. Uses the same operators as strings, except for ~==.
  • Sound
  • Treated similarly to strings.
  • StateLabel
  • Contains the name of a state using double quotes. Can be used for dynamically changing what state an actor is supposed to go to at certain points in their behavior.
  • null should be used if an actor should not perform a jump. Do not use this when performing an action function within an if () statement as it will always fail.
  • "Null" should be used if the actor should be destroyed. Do not confuse this with null. Every actor has this state which will remove them upon making it there.
  • Color
  • Used to record a a color either defined in the X11R6RGB lump or a hexidecimal surrounded in double quotes, or a directly specified ARGB value.
  • NOTE: Several actor properties can be read only after the mask has been cleared, such as bloodcolor.
Color bl = (bloodcolor & 0xffffff); //Six 'f's, no more, no less!

// Alpha, red, green, and blue from left to right.
// Can also access directly as demonstrated.
Color regrbl = Color(255, 128, 192, 255); 
regrbl.a = 255;
regrbl.r = 255;
regrbl.g = 192;
regrbl.b = 128;
  • Class Casts
  • Used for holding class names and passing said names into places where a function may be expecting a legitimate class for its functionality.
// Ternary operator is basically an if/else statement, short-handed. 
// Left side (between ? and : ) is executed if the statement before the ? is true, right side if false.
bool grenadeChosen = (CountInv("GrenadeToken")) ? true : false;
Class<Actor> proj = "RocketProjectile";

if (grenadeChosen) proj = "GrenadeProjectile";
A_FireCustomMissile(proj);

Containers

The following are special types of variables of greater complexity.

  • Similar to their C++ counterpart, contains data of different types. Can also contain functions.
  • State
  • An internal struct which can be used to gather information about an actor's state.

Constants

Unlike C++ and DECORATE, ZScript's constant non-arrays do not have a type to be given -- they auto resolve by themselves based on their usage.

const con1 = 1; //int
const con2 = 2.5; //double
const con3 = "Stringify me, cap'n!"; //string
const con4 = 'A name it is.'; //name

Arrays

Arrays behave like their C++ counterparts, including multi-dimensional support.

Local Arrays

Local arrays can be defined with a set number of index spots, but cannot be initialized until after their declaration. Changing the array's contents must be done inside an anonymous or named function. These can also be declared inside of said functions for temporary existence.

int MyArray[2];
MyArray[0] = 5;
MyArray[1] = 10;

Constant Arrays

Constant arrays are different from normal constants.

  • Can be defined in (anonymous) functions
  • Must have all their fields initialized immediately.
  • Must have a type, and the static word present.
// static const <type> <name>[] =
static const Color SecondaryColor[] =
{
    "Red",
    "Yellow",
    "Green",
    "Blue" // Unlike enums, the last member must not have a comma.
};

See Also