Properties and Functions

Before we dive in, have some glossary The line changeX: 2 consists of 2 elements.

• Property: changeX
• Value: 2

This line tells the program that the x-position of all Walls gets set to 2.

Math Expressions

Beatwalls supports math expressions.

helix:
    changeWidth: 2+3*4^5%6
    changeWidth: pi+3

Functions

Functions in Beatwalls take some numbers as input and return one number as output. The Function types in included are:

• common Math functions like sin(x), ceil(x), log(x), sqrt(x), etc... found here (opens new window)
• all easing methods here (opens new window), e.g. easeInOUtQuad(min, max)
• random(min,max)

line:
    beat: 10
    addWidth: easeInOutQuad(4,0) # start with 10, ease down to 0
    changeHeight: random(0, 2)   # randomly change the height to a value between 0 and 2

Variables

There are certain variables set at runtime:

• math variables: pi, e
• p (progress): Value of 0..1 on how many Walls of the structure have been affected. When you have a structure with 4 walls, p will be 0 on the first wall, 0.25 on the second, etc...
• r (repetitions): 0 on the first repetition, 1 on the second, etc. More on repetitions later.
• d (duration): Value of the duration Property.

helix:
    beat: 10 + r*d # total this Structure will be 16 beat long
    repeat: 4
    duration: 4
    addWidth: sin(pi*p)

WARNING

Not all properties that are used to create wallstructures have access to easing functions and p.

User defined Variables

You can create your own variables

variable offset:
    value: 20
helix:
    beat: 10 + offset