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# checkbox

checkbox -- Sense on-screen controls.

## Description

Sense on-screen controls. Requires Winsound or TCL/TK.

## Syntax

kr checkbox knum

## Performance

kr -- value of the checkbox control. If the checkbox is set (pushed) then return 1, if not, return 0.

knum -- the number of the checkbox. If it does not exist, it is made on-screen at initialization.

## Examples

Here is a simple example of the checkbox opcode. It uses the files checkbox.orc and checkbox.sco.

Example 1. Simple example of the checkbox opcode.

    /* checkbox.orc */
    ; Initialize the global variables.
    sr = 44100
    kr = 44100
    ksmps = 1
    nchnls = 1

    instr 1
      ; Get the value from the checkbox.
      k1 checkbox 1

      ; If the checkbox is selected then k2=440, otherwise k2=880.
      k2 = (k1 == 0 ? 440 : 880)

      a1 oscil 10000, k2, 1
      out a1
    endin
    /* checkbox.orc */

    /* checkbox.sco */
    ; Just generate a nice, ordinary sine wave.
    f 1 0 32768 10 1

    ; Play Instrument #1 for ten seconds.
    i 1 0 10
    e
    /* checkbox.sco */

## See Also

button

## Credits

Author: John ffitch
University of Bath, Codemist. Ltd.
Bath, UK
September, 2000

Example written by Kevin Conder.

New in Csound version 4.08

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