FLslider
FLslider — Puts a slider into the corresponding FLTK container.
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 FLslider and must not be set by the user label. (The user label is a double-quoted string containing some user-provided text placed near the widget.)
“label” -- a double-quoted string containing some user-provided text, placed near the corresponding widget.
imin -- minimum value of output range (corresponds to the left value for horizontal sliders, and the top value for vertical sliders).
imax -- maximum value of output range (corresponds to the right value for horizontal sliders, and the bottom value for vertical sliders).
The imin argument may be greater than imax argument. This has the effect of “reversing” the object so the larger values are in the opposite direction. This also switches which end of the filled sliders is filled.
iexp -- an integer number denoting the behaviour of valuator:
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0 = valuator output is linear
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-1 = valuator output is exponential
All other positive numbers for iexp indicate the number of an existing table that is used for indexing. Linear interpolation is provided in table indexing. A negative table number suppresses interpolation.
![[Warning]](images/warning.png)
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IMPORTANT! |
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Notice that the tables used by valuators must be created with the ftgen opcode and placed in the orchestra before the corresponding valuator. They can not placed in the score. This is because tables placed in the score are created later than the initialization of the opcodes placed in the header section of the orchestra. |
itype -- an integer number denoting the appearance of the valuator.
The itype argument can be set to the following values:
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1 - shows a horizontal fill slider
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2 - a vertical fill slider
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3 - a horizontal engraved slider
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4 - a vertical engraved slider
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5 - a horizontal nice slider
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6 - a vertical nice slider
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7 - a horizontal up-box nice slider
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8 - a vertical up-box nice slider
FLslider - a horizontal fill slider (itype=1).
FLslider - a horizontal engraved slider (itype=3).
FLslider - a horizontal nice slider (itype=5).
You can also create "plastic" looking sliders by adding 20 to itype.
idisp -- a handle value that was output from a previous instance of the FLvalue opcode to display the current value of the current valuator in the FLvalue widget itself. If the user doesn't want to use this feature that displays current values, it must be set to a negative number by the user.
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).
Performance
kout -- output value
FLsliders are created with the minimum value by default in the left/at the top. If you want to reverse the slider, reverse the values. See the example below.
Examples
Here is an example of the FLslider opcode. It uses the file FLslider.csd.
Example 287. Example of the FLslider 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 FLslider.wav -W ;;; for file output any platform </CsOptions> <CsInstruments> ; A sine with oscillator with flslider controlled frequency sr = 44100 kr = 441 ksmps = 100 nchnls = 1 FLpanel "Frequency Slider", 900, 400, 50, 50 ; Minimum value output by the slider imin = 200 ; Maximum value output by the slider imax = 5000 ; Logarithmic type slider selected iexp = -1 ; Slider graphic type (5='nice' slider) itype = 5 ; Display handle (-1=not used) idisp = -1 ; Width of the slider in pixels iwidth = 750 ; Height of the slider in pixels iheight = 30 ; Distance of the left edge of the slider ; from the left edge of the panel ix = 125 ; Distance of the top edge of the slider ; from the top edge of the panel iy = 50 gkfreq, ihandle FLslider "Frequency", imin, imax, iexp, itype, idisp, iwidth, iheight, ix, iy ; End of panel contents FLpanelEnd ; Run the widget thread! FLrun ;Set the widget's initial value FLsetVal_i 300, ihandle instr 1 iamp = 15000 ifn = 1 kfreq portk gkfreq, 0.005 ;Smooth gkfreq to avoid zipper noise asig oscili iamp, kfreq, ifn out asig endin </CsInstruments> <CsScore> ; Function table that defines a single cycle ; of a sine wave. f 1 0 1024 10 1 ; Instrument 1 will play a note for 1 hour. i 1 0 3600 e </CsScore> </CsoundSynthesizer>
Here is another example of the FLslider opcode, showing the slider types and other options. It also shows the usage of FLvalue to display a widget's contents. It uses the file FLslider-2.csd.
Example 288. More complex example of the FLslider opcode.
<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 FLslider-2.wav -W ;;; for file output any platform </CsOptions> <CsInstruments> sr = 44100 kr = 441 ksmps = 100 nchnls = 1 ;By Andres Cabrera 2007 FLpanel "Slider Types", 410, 260, 50, 50 ; Distance of the left edge of the slider ; from the left edge of the panel ix = 10 ; Distance of the top edge of the slider ; from the top edge of the panel iy = 10 ; Create boxes to display widget values givalue1 FLvalue "1", 60, 20, ix + 330, iy givalue3 FLvalue "3", 60, 20, ix + 330, iy + 40 givalue5 FLvalue "5", 60, 20, ix + 330, iy + 80 givalue2 FLvalue "2", 60, 20, ix + 60, iy + 140 givalue4 FLvalue "4", 60, 20, ix + 195, iy + 140 givalue6 FLvalue "6", 60, 20, ix + 320, iy + 140 ;Horizontal sliders gkdummy1, gihandle1 FLslider "Type 1", 200, 5000, -1, 1, givalue1, 320, 20, ix, iy gkdummy3, gihandle3 FLslider "Type 3", 0, 15000, 0, 3, givalue3, 320, 20, ix, iy + 40 ; Reversed slider gkdummy5, gihandle5 FLslider "Type 5", 1, 0, 0, 5, givalue5, 320, 20, ix, iy + 80 ;Vertical sliders gkdummy2, gihandle2 FLslider "Type 2", 0, 1, 0, 2, givalue2, 20, 100, ix+ 30 , iy + 120 ; Reversed slider gkdummy4, gihandle4 FLslider "Type 4", 1, 0, 0, 4, givalue4, 20, 100, ix + 165 , iy + 120 gkdummy6, gihandle6 FLslider "Type 6", 0, 1, 0, 6, givalue6, 20, 100, ix + 290 , iy + 120 FLpanelEnd FLpanel "Plastic Slider Types", 410, 300, 150, 150 ; Distance of the left edge of the slider ; from the left edge of the panel ix = 10 ; Distance of the top edge of the slider ; from the top edge of the panel iy = 10 ; Create boxes to display widget values givalue21 FLvalue "21", 60, 20, ix + 330, iy givalue23 FLvalue "23", 60, 20, ix + 330, iy + 40 givalue25 FLvalue "25", 60, 20, ix + 330, iy + 80 givalue22 FLvalue "22", 60, 20, ix + 60, iy + 140 givalue24 FLvalue "24", 60, 20, ix + 195, iy + 140 givalue26 FLvalue "26", 60, 20, ix + 320, iy + 140 ;Horizontal sliders gkdummy21, gihandle21 FLslider "Type 21", 200, 5000, -1, 21, givalue21, 320, 20, ix, iy gkdummy23, gihandle23 FLslider "Type 23", 0, 15000, 0, 23, givalue23, 320, 20, ix, iy + 40 ; Reversed slider gkdummy25, gihandle25 FLslider "Type 25", 1, 0, 0, 25, givalue25, 320, 20, ix, iy + 80 ;Vertical sliders gkdummy22, gihandle22 FLslider "Type 22", 0, 1, 0, 22, givalue22, 20, 100, ix+ 30 , iy + 120 ; Reversed slider gkdummy24, gihandle24 FLslider "Type 24", 1, 0, 0, 24, givalue24, 20, 100, ix + 165 , iy + 120 gkdummy26, gihandle26 FLslider "Type 26", 0, 1, 0, 26, givalue26, 20, 100, ix + 290 , iy + 120 ;Button to add color to the sliders gkcolors, ihdummy FLbutton "Color", 1, 0, 21, 150, 30, 30, 260, 0, 10, 0, 1 FLpanelEnd FLrun ;Set some widget's initial value FLsetVal_i 500, gihandle1 FLsetVal_i 1000, gihandle3 instr 10 ; Set the color of widgets FLsetColor 200, 230, 0, gihandle1 FLsetColor 0, 123, 100, gihandle2 FLsetColor 180, 23, 12, gihandle3 FLsetColor 10, 230, 0, gihandle4 FLsetColor 0, 0, 0, gihandle5 FLsetColor 0, 0, 0, gihandle6 FLsetColor 200, 230, 0, givalue1 FLsetColor 0, 123, 100, givalue2 FLsetColor 180, 23, 12, givalue3 FLsetColor 10, 230, 0, givalue4 FLsetColor 255, 255, 255, givalue5 FLsetColor 255, 255, 255, givalue6 FLsetColor2 20, 23, 100, gihandle1 FLsetColor2 200,0 ,123 , gihandle2 FLsetColor2 180, 180, 100, gihandle3 FLsetColor2 180, 23, 12, gihandle4 FLsetColor2 180, 180, 100, gihandle5 FLsetColor2 180, 23, 12, gihandle6 FLsetColor 200, 230, 0, gihandle21 FLsetColor 0, 123, 100, gihandle22 FLsetColor 180, 23, 12, gihandle23 FLsetColor 10, 230, 0, gihandle24 FLsetColor 0, 0, 0, gihandle25 FLsetColor 0, 0, 0, gihandle26 FLsetColor 200, 230, 0, givalue21 FLsetColor 0, 123, 100, givalue22 FLsetColor 180, 23, 12, givalue23 FLsetColor 10, 230, 0, givalue24 FLsetColor 255, 255, 255, givalue25 FLsetColor 255, 255, 255, givalue26 FLsetColor2 20, 23, 100, gihandle21 FLsetColor2 200,0 ,123 , gihandle22 FLsetColor2 180, 180, 100, gihandle23 FLsetColor2 180, 23, 12, gihandle24 FLsetColor2 180, 180, 100, gihandle25 FLsetColor2 180, 23, 12, gihandle26 ; Slider values must be updated for colors to change FLsetVal_i 250, gihandle1 FLsetVal_i 0.5, gihandle2 FLsetVal_i 0, gihandle3 FLsetVal_i 0, gihandle4 FLsetVal_i 0, gihandle5 FLsetVal_i 0.5, gihandle6 FLsetVal_i 250, gihandle21 FLsetVal_i 0.5, gihandle22 FLsetVal_i 500, gihandle23 FLsetVal_i 0, gihandle24 FLsetVal_i 0, gihandle25 FLsetVal_i 0.5, gihandle26 endin </CsInstruments> <CsScore> f 0 3600 ;Dumy table to make csound wait for realtime events e </CsScore> </CsoundSynthesizer>