FLexecButton
FLexecButton — A FLTK widget opcode that creates a button that executes a command.
Description
A FLTK widget opcode that creates a button that executes a command. Useful for opening up HTML documentation as About text or to start a separate program from an FLTK widget interface.
![[Warning]](images/warning.png)
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Warning |
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Because any command can be executed, the user is advised to be very careful when using this opcode and when running orchestras by others using this opcode. |
Initialization
ihandle -- a handle value (an integer number) that unequivocally references a corresponding widget. This is used by other opcodes that modify a widget's properties (see Modifying FLTK Widget Appearance). It is automatically output by FLexecButton.
“command” -- a double-quoted string containing a command to execute.
Notice that with FLexecButton, the default text for the button is "About" and it is necessary to call the FLsetText opcode to change the text of the button.
iwidth -- width of widget.
iheight -- height of widget.
ix -- horizontal position of upper left corner of the valuator, relative to the upper left corner of corresponding window (expressed in pixels).
iy -- vertical position of upper left corner of the valuator, relative to the upper left corner of corresponding window (expressed in pixels).
Examples
Here is an example of the FLexecButton opcode. It uses the file FLexecButton.csd.
Example 266. Example of the FLexecButton 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 display -odac -iadc -d ;;;RT audio I/O </CsOptions> <CsInstruments> sr = 44100 ksmps = 10 nchnls = 1 ; Example by Jonathan Murphy 2007 ;;; reset amplitude range 0dbfs = 1 ;;; set the base colour for the panel FLcolor 100, 0, 200 ;;; define the panel FLpanel "FLexecButton", 250, 100, 0, 0 ;;; sliders to control time stretch and pitch gkstr, gistretch FLslider "Time", 0.5, 1.5, 0, 6, -1, 10, 60, 150, 20 gkpch, gipitch FLslider "Pitch", 0.5, 1.5, 0, 6, -1, 10, 60, 200, 20 ;;; set FLexecButton colour FLcolor 255, 255, 0 ;;; when this button is pressed, fourier analysis is performed on the file ;;; "beats.wav", producing the analysis file "beats.pvx" gipvoc FLexecButton "csound -U pvanal beats.wav beats.pvx", 60, 20, 20, 20 ;;; set FLexecButton text FLsetText "PVOC", gipvoc ;;; when this button is pressed, instr 10000 is called, exiting ;;; Csound immediately ;;; cancel previous colour FLcolor -1 ;;; set colour for kill button FLcolor 255, 0, 0 gkkill, gikill FLbutton "X", 1, 1, 1, 20, 20, 100, 20, 0, 10000, 0, 0.1 ;;; cancel previous colour FLcolor -1 ;;; set colour for play/stop and pause buttons FLcolor 0, 200, 0 ;;; pause and play/stop buttons gkpause, gipause FLbutton "@||", 1, 0, 2, 40, 20, 20, 60, -1 gkplay, giplay FLbutton "@|>", 1, 0, 2, 40, 20, 80, 60, -1 ;;; end the panel FLpanelEnd ;;; set initial values for time stretch and pitch FLsetVal_i 1, gistretch FLsetVal_i 1, gipitch ;;; run the panel FLrun instr 1 ; trigger play/stop ;;; is the play/stop button on or off? ;;; either way we need to trigger something, ;;; so we can't just use the value of gkplay kon trigger gkplay, 0, 0 koff trigger gkplay, 1, 1 ;;; if on, start instr 2 schedkwhen kon, -1, -1, 2, 0, -1 ;;; if off, stop instr 2 schedkwhen koff, -1, -1, -2, 0, -1 endin instr 2 ;;; paused or playing? if (gkpause == 1) kgoto pause kgoto start pause: ;;; if the pause button is on, skip sound production kgoto end start: ;;; get the length of the analysis file in seconds ilen filelen "beats.pvx" ;;; determine base frequency of playback icps = 1/ilen ;;; create a table over the length of the file itpt ftgen 0, 0, 513, -7, 0, 512, ilen ;;; phasor for time control kphs phasor icps * gkstr ;;; use phasor as index into table kndx = kphs * 512 ;;; read table ktpt tablei kndx, itpt ;;; use value from table as time pointer into file fsig1 pvsfread ktpt, "beats.pvx" ;;; change playback pitch fsig2 pvscale fsig1, gkpch ;;; resynthesize aout pvsynth fsig2 ;;; envelope to avoid clicks and clipping aenv linsegr 0, 0.3, 0.75, 0.1, 0 aout = aout * aenv out aout end: endin instr 10000 ; kill exitnow endin </CsInstruments> <CsScore> i1 0 10000 e </CsScore> </CsoundSynthesizer>