color

Measured with a decimal value from 0 to 1.

It can only be dependent on time when it is expressed as: RGB vars or luminance.

can be expressed as:

  • vector3d: One only variable with 3 components (r;g;b).
  • RGB vars: 3 independent variables, one for each color: red, green and blue.
  • luminance: One only variable (r=g=b) for grayscale colors.






size

Measured in pixels, centimetres, inches or visual degrees.






2dsize

Measured in pixels, centimetres, inches or visual degrees.

It can only be dependent on time when it is expressed as: cartesian vars or x=y.

can be expressed as:

  • vector2d: One only variable with 2 components (horizontal;vertical).
  • cartesian vars: 2 independent cartesian variables.
  • x=y: One only variable to measure size making sizeX = sizeY.






position

Measured in pixels, centimetres, inches or visual degrees.






2dposition

Measured in pixels, centimetres, inches or visual degrees. X increases from left to right and Y increases from bottom to top.

It can only be dependent on time when it is expressed as: cartesian vars or polar vars.

can be expressed as:

  • vector2d: One only variable with 2 components (horizontal;vertical).
  • cartesian vars: 2 independent cartesian variables.
  • polar vars: 2 independent polar variables..






angle

Measured in radians or degrees. Measured counterclockwise from the x axis.






time

Measured in seconds or frames. The duration of a frame depends on the frame rate property of the test.

When the frame rate is 60Hz, the duration of a frame is 16,666 milliseconds.

When the frame rate is 120 Hz, the duration of a frame is 8,333 milliseconds.






frequency

Frequency measured in hertz (cycles per second).






font

Any of the system fonts.






positive non-zero integer

Positive non-zero integer.






integer value 0 or 1

The only possible values are 0 or 1.






integer from 3 to 10

Integer value from 3 to 10. Used to create polygons with a fixed number of sides.






value from 0 to 1

Decimal value from zero to one.






positive (or zero) decimal value

Positive (or zero) decimal value.






decimal value

Decimal value.