checkbox — Sense on-screen controls.
kres -- 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.
Here is a simple example of the checkbox opcode. It uses the file checkbox.csd.
Example 64. Simple example of the checkbox opcode.
See the sections Real-time Audio and Command Line Flags for more information on using command line flags.
<CsoundSynthesizer>
<CsOptions>
; Select audio/midi flags here according to platform
; Audio out Audio in No messages
-odac -iadc -d ;;;RT audio I/O
; For Non-realtime ouput leave only the line below:
; -o checkbox.wav -W ;;; for file output any platform
</CsOptions>
<CsInstruments>
; 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
</CsInstruments>
<CsScore>
; Just generate a nice, ordinary sine wave.
f 1 0 32768 10 1
; Play Instrument #1 for ten seconds.
i 1 0 10
e
</CsScore>
</CsoundSynthesizer>