Controls IO

Controls.Inputs

Table representing a Control Script’s input pins, used to access the properties and methods of controls wired to the control script.  .EventHandler is used to assign event handlers to inputs.

Properties

Name

Attribute

Comment

.Value

Read Only

Floating point value of control. If you pass in a Boolean ( like Controls.Outputs[1].Value = true ) it is converted to either a 0 ( false ) or 1 ( true ).

.Values

Read Only

Table of floating point values of controls. Only used when connected to controls that create tables of values such as the 2D panner, RTA - Band-Pass or Responsalyzer, Meters.

.Position

Read Only

floating point position which goes from 0.0 -> 1.0

.String

Read Only

string representation of control value

.Boolean

Read Only

returns true if the position of the control is >0.5

.Index

Read Only

index of control.

.EventHandler

called when input value changes

If you reference a Controls.Inputs[ n] in your script, and there is nothing connected to that input on the Control Script component, the following error displays in the debug log: [string "<input name>..."]:43: attempt to index global '<index field name>' (a nil value).

Remarks

Controls.Inputs is a Lua table.  Tables in Lua are not copied when they are assigned a new variable name, thus statements like:  input1 = Controls.Inputs[1] does not create a copy of Controls.Inputs in input1, input1 points at the original table.

While Controls.Inputs is primarily intended for reading from the inputs, it is possible to write to the inputs.

Controls.Inputs[1].Value = 5 --Writes the integer 5 to the input pin of the Control Script

The hash operator # can be used to determine the number of input pins (the length of the Controls.Inputs table).  This technique is useful for making Control Scripts scale to accommodate a varying number of input pins.  Note:  this only works properly if all the input pins are connected.

numInputPins = #Controls.Inputs   --Grabs the number of input pins.

Examples

Example 1: Defining and Assigning an EventHandler Function

The following example defines an EventHandler function and assigns it to five Controls.Inputs, which represent the input pins of the Control Script. The code assigns the same EventHandler function to each of 5 inputs.  The function uses the .Index property to determine which input caused it to be called.

Function PrintInputString(calledControl)

print(“This event handler was called by: “..calledControl.Index)

print(“The control’s string is:”..calledControl.String)

end

 

for i=1,5 do

Controls.Inputs[i].EventHandler = PrintInputString  --Assign EventHandler to inputs

end

OUTPUT: (if user changes value of input number 3)

This EventHandler was called by: 3

The control’s string is: 4.5 dB

Example 2: List Each Input Pin and String Property

The ipairs iterator is a useful Lua function for iterating through all Controls.Inputs or Controls.Outputs pins.

The following code will list each input pin and its string property:

for key,object in ipairs(Controls.Inputs) do

print("Input pin:"..key.." has string:"..object.String)

end

Controls.Outputs

Table representing a Control Script’s output pins, used to write values of controls wired to the control script.  .EventHandler is used to assign event handlers to inputs.

Properties

Name

Attribute

Comment

.Value

Read Write

floating point value of control

.Position

Read Write

floating point position which goes from 0.0 -> 1.0

.String

Read Write

string representation of control value

.RampTime

Read Write

defaults to 0 seconds

.Index

Read Only

index of control

.Legend

Read Write

string representing the Legend of a button or a fader.

NOTE:  If you reference a Controls.Outputs [n] in your script, and there is nothing connected to that output on the Control Script component, the following error displays in the debug log: [string "<input name>..."]:43: attempt to index global '<index field name>' (a nil value).

 

Methods

Name

Arguments

Comment

:Trigger

none

Triggers the output

 

Metadata

Name

Type

Comment

.IsInvisible

Boolean

false = visible, true = hidden

.IsDisabled

Boolean

false = enabled, true = disabled

.IsIndeterminate

Boolean

false = value is valid, true = value is not valid

Controls will be Indeterminate in 2 cases-

  • The control is inside an I/O Frame (or other network device) with which the core does not have communications.
  • The control is inside a Channel Group where multiple channels are selected and the given control has a different value in each selected channel.

.Color

String

String which can be translated to a color ( See Metadata in Lua Code Examples for formats )

.Choices

String Array ( table )

List of choices for a control

.Legend

String

Legend displayed on button

Remarks

Controls.Outputs is primarily intended for writing values to connected controls, however it’s possible to read the current value of an output pin.  For example: Print(Controls.Outputs[1].String will print the current value of Controls.Outputs[1], which is read from the connected control pin.

Examples

Example 1: Write a value to an output pin

theTestBox = Controls.Outputs[1]

a = 5

b = 6

theTestBox.Value = a + b  --Output 1 ends up with a value of 11

Example 2: Trigger an output

Controls.Outputs[3]:Trigger() --Triggers the output of pin 3, similar to a momentary button.

Example 3: Iterates though all output pins and prints the .Value property

for key, control in ipairs(Controls.Outputs) do

print("key is:"..key.." Value of control is:"..control.Value)

end

Control EventHandler

The EventHandler can be assigned to be a simple function that is called each time that particular control value changes. The functions signature looks like:

void handler ( changedControl )

The variable changedControl contains the Control.Inputs object that called the EventHandler. This is useful in the case where multiple Controls.Inputs are assigned the same EventHandler function.

Notes on .Values

The property .Values is used by a few controls to receive or transmit tables of data through one control pin. .Values is currently supported by the 2D Panner, RTA - Band-Pass, Responsalyzer and Meters.

Examples

--Example 1: Set the position of an input in a matrix mixer configured as a 2D panner.

sourcePosition = {0.5, 0.75} --X,Y position desired in 2D panner

Controls.Outputs[1].Values = sourcePosition --Set .Values property

-- Example 2: Print the frequencies and RMS Levels from an RTA - Band-Pass (frequencies and RMS Level pins connected)

freqs = Controls.Inputs[1] -- Frequencies pin connected to input 1

rmsLevels = Controls.Inputs[2] - RMS Levels pin connected to input 2


 

© 2009 - 2016 QSC, LLC. All rights reserved. QSC and the QSC logo are trademarks of QSC, LLC in the U.S. Patent and Trademark office and other countries. All other trademarks are the property of their respective owners.

http://patents.qsc.com.