Iterations with the Bardolph Language (in progress)

This article is incomplete and being worked on. Please see the secion on “Repeat Loops” in Language Reference for more information.

Introduction

This article provides an introduction the repeat command in Bardolph’s programming language.

Iterations in this language are designed for use cases aprpopos to lights. Specifically, they are built around the notion of a cue, which is a state that you want one or more lights to have. Because of this, iterations can provide a variable that is interpolated between cycles, as opposed to one that is incremented with each repetition.

Interpolated Values

For example, suppose you want all the lights to slowly rise from complete darkness to full intensity, and you want it to happen over the period of an hour. One way to accomplish this is with:

brightness 0
set all
duration {60 * 60}
brightness 100
set all

However, in practice, I wouldn’t necessarily recommend sending an hour-long command to all the light bulbs. A more reliable method is to break it up, sending a command to the lights every 5 minutes:

define five_min {5 * 60}
time five_min duration five_min
repeat 12 with brt from 0 to 100 begin
    brightness brt
    set all
end

Notice that the values for brt are interpolated between the first and last values. An equivalent, but messier and approach would be to use a more traditional form of a loop:

Iterating Over Lights

For some uses, it’s helpful to iterate over all of the lights, accessing each one individually. For example, as a test, you might want to turn on each light for 2 seconds and turn it off again. You can do this with:

repeat all as the_light begin
    time 0
    on the_light
    time 3
    off the_light
end

By adding interpolation to this kind of iteration, you can distribute a range of values across a set of lights, distributed evenly.

Suppose you want to set all your lights to a range of hues between 100 and 140. In addition, you want change only each light’s hue, but keep the brightness and saturation the same:

repeat all as the_light with the_hue from 100 to 140
begin
    get the_light
    hue the_hue
    set the_light
end

In this case, the run-time system uses the number of lights on the network to calculate a delta and assign evenly-distributed values to the_hue.

Plain Iterations