A to Z Scripting: Basic maths: Difference between revisions
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== Integers == | == Integers == | ||
There's no data type for integers in DoomScript, but you can make an integer out of a float like this | There's no data type for integers in DoomScript, but you can make an integer out of a float like this: | ||
float integer1 = int(5.8); //returns 5 | float integer1 = int(5.8); //returns 5 | ||
int() is a utility script, you can read more about them here: [[A to Z Scripting: Utility scripts]]. | |||
== Vectors == | == Vectors == |
Revision as of 19:25, 28 December 2020
Basic maths symbols
You can use basic maths symbols, as well as brackets (parentheses):
symbol | effect | can be used with |
---|---|---|
+ | add/combine | floats, vectors, strings |
- | subtract | floats, vectors |
* | multiply | floats |
/ | divide | floats |
The = sign
An important difference is what the = sign does. In scripting, = means "set", while == means "equals".
teleport_destination = '20 20 20'; //set teleport_destination to '20 20 20' float1 = float2 + float3; //set float1 to the sum of float2 and float3 if ( float1 == float2 ) //check if float1 is equal to float2
== is used in conditionals to check whether a condition is true (2 values are equal to each other) before carrying out an associated set of instructions. That's described in detail in a later article, A to Z Scripting: Conditionals.
Increasing/decreasing
Increasing (incrementing) a variable's value by 1 would work like this:
counter = counter + 1; //set "counter" to: the current value of "counter" + 1
An alternative method to increase a variable by 1 is:
counter++; //increase "counter" by 1 counter--; //decrease "counter" by 1
Combining
You can freely combine script events, variables and absolute values in one line like this:
teleport_destination = $player1.getOrigin() + teleportation_offset + '0 0 16';
Strings can be cobbled together from strings, floats and vectors with the + sign. If you also want to include entities you need to turn them into strings with getName(). This is quite useful for sending helpful messages to the console while testing the script:
sys.println(entity1.getName() + " is at the location " + entity1.getOrigin()); //+ doesn't work with entities, so you need to use getName() to turn it into a string
What you can't do is combine floats and vectors. You'll need to i.e. use a script event to convert the vector into a float (see "Vectors").
Integers
There's no data type for integers in DoomScript, but you can make an integer out of a float like this:
float integer1 = int(5.8); //returns 5
int() is a utility script, you can read more about them here: A to Z Scripting: Utility scripts.
Vectors
You can add or subtract vectors from each other. Things like multiplication or turning a vector into a distance require script events such as DotProduct(), CrossProduct() and vecLength().
You can access & change individual components of a vector variable by appending _x, _y or _z to the name, i.e. teleport_destination_z. These will be floats.
More detail on vector maths and what you can do with it in A to Z Scripting: Special methods.
Next / previous article
- Next article: A to Z Scripting: Setting up the .script files
- Previous article: A to Z Scripting: More scripting basics
- Table of contents: A to Z Scripting