Builtin Namespaces

The following namespaces provide access to common constants such as special keys or named colors.


Use the colors namespace to select colors by their name. For example you can use Colors.aquamarine or Colors.bisque. The entire list of names is very long. You can find a complete list in the CSS Specification.

These functions are available both in the global scope, and in the Colors namespace.

  • rgb(int, int, int) -> color, rgba(int, int, int, float) -> color

Return the color as in CSS. Like in CSS, these two functions are actually aliases that can take three or four parameters.

The first 3 parameters can be either number between 0 and 255, or a percentage with a % unit. The fourth value, if present, is an alpha value between 0 and 1.

Unlike in CSS, the commas are mandatory.

  • hsv(h: float, s: float, v: float) -> color, hsv(h: float, s: float, v: float, a: float) -> color

Return a color computed from the HSV color space. The hue is between 0 and 360. The saturation, value, and optional alpha parameter are expected to be within the range of 0 and 1.


Use the constants in the Key namespace to handle pressing of keys that don’t have a printable character. Check the value of KeyEvent’s text property against the constants below.

  • Backspace

  • Tab

  • Return

  • Escape

  • Backtab

  • Delete

  • Shift

  • Control

  • Alt

  • AltGr

  • CapsLock

  • ShiftR

  • ControlR

  • Meta

  • MetaR

  • Space

  • UpArrow

  • DownArrow

  • LeftArrow

  • RightArrow

  • F1

  • F2

  • F3

  • F4

  • F5

  • F6

  • F7

  • F8

  • F9

  • F10

  • F11

  • F12

  • F13

  • F14

  • F15

  • F16

  • F17

  • F18

  • F19

  • F20

  • F21

  • F22

  • F23

  • F24

  • Insert

  • Home

  • End

  • PageUp

  • PageDown

  • ScrollLock

  • Pause

  • SysReq

  • Stop

  • Menu


These functions are available both in the global scope and in the Math namespace.

abs(T) -> T

Return the absolute value, where T is a numeric type.

acos(float) -> angle, asin(float) -> angle, atan(float) -> angle, cos(angle) -> float, sin(angle) -> float, tan(angle) -> float

The trigonometry function. Note that the should be typed with deg or rad unit (for example cos(90deg) or sin(slider.value * 1deg)).

ceil(float) -> int and floor(float) -> int

Return the ceiling or floor

clamp(T, T, T) -> T

Takes a value, minimum and maximum and returns maximum if value > maximum, minimum if value < minimum, or value in all other cases.

log(float, float) -> float

Return the log of the first value with a base of the second value

max(T, T) -> T and min(T, T) -> T

Return the arguments with the minimum (or maximum) value. All arguments must be of the same numeric type

mod(T, T) -> T

Perform a modulo operation, where T is some numeric type.

round(float) -> int

Return the value rounded to the nearest integer

sqrt(float) -> float

Square root

pow(float, float) -> float

Return the value of the first value raised to the second