checkbox — Sense on-screen controls.
Note that this opcode is not available on Windows due to the implimentation of pipes on that system
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 135. 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 -odac -iadc ;;;RT audio I/O ; For Non-realtime ouput leave only the line below: ; -o checkbox.wav -W ;;; for file output any platform </CsOptions> <CsInstruments> sr = 44100 ksmps = 10 nchnls = 2 instr 1 kq init 0 ; 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 outs a1, a1 kq button 1 schedkwhen kq, 0, 1, 2, 0, 0 endin instr 2 exitnow endin </CsInstruments> <CsScore> ; sine wave. f 1 0 32768 10 1 i 1 0 1000 e </CsScore> </CsoundSynthesizer>