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<div class="refentry" title="FLexecButton">
<a id="FLexecButton"></a>
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<a id="IndexFLexecButton" class="indexterm"></a>
<div class="refnamediv">
<h2>
<span class="refentrytitle">FLexecButton</span>
</h2>
<p>FLexecButton —
A FLTK widget opcode that creates a button that executes a command.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp20760904"></a>
<h2>Description</h2>
<p>
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.
</p>
<div class="warning" title="Warning" style="margin-left: 0.5in; margin-right: 0.5in;">
<table border="0" summary="Warning: Warning">
<tr>
<td rowspan="2" align="center" valign="top" width="25">
<img alt="[Warning]" src="images/warning.png" />
</td>
<th align="left">Warning</th>
</tr>
<tr>
<td align="left" valign="top">
<p>
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.
</p>
</td>
</tr>
</table>
</div>
</div>
<div class="refsect1" title="Syntax">
<a id="idp20755520"></a>
<h2>Syntax</h2>
<pre class="synopsis">ihandle <span class="command"><strong>FLexecButton</strong></span> "command", iwidth, iheight, ix, iy</pre>
</div>
<div class="refsect1" title="Initialization">
<a id="idp20756736"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>ihandle</em></span>
-- 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
<a class="link" href="ControlFltkAppearance.html" title="Modifying FLTK Widget Appearance"><em class="citetitle">Modifying FLTK Widget Appearance</em></a>). It is automatically output by <span class="emphasis"><em>FLexecButton</em></span>.
</p>
<p>
<span class="emphasis"><em><span class="quote">“<span class="quote">command</span>”</span></em></span> -- a double-quoted string containing a command to execute.
</p>
<p>
Notice that with <span class="emphasis"><em>FLexecButton</em></span>, the default text for the button is "About" and it is necessary to call the <a class="link" href="FLsetText.html" title="FLsetText"><em class="citetitle">FLsetText</em></a>
opcode to change the text of the button.
</p>
<p>
<span class="emphasis"><em>iwidth</em></span> -- width of widget.
</p>
<p>
<span class="emphasis"><em>iheight</em></span> -- height of widget.
</p>
<p>
<span class="emphasis"><em>ix</em></span> -- horizontal position of upper left corner of the valuator, relative to the upper left corner of corresponding window (expressed in pixels).
</p>
<p>
<span class="emphasis"><em>iy</em></span> -- vertical position of upper left corner of the valuator, relative to the upper left corner of corresponding window (expressed in pixels).
</p>
</div>
<div class="refsect1" title="Examples">
<a id="idp20819184"></a>
<h2>Examples</h2>
<p>
Here is an example of the FLexecButton opcode. It uses the file <a class="ulink" href="examples/FLexecButton.csd" target="_top"><em class="citetitle">FLexecButton.csd</em></a>.
</p>
<div class="example">
<a id="idp20820176"></a>
<p class="title">
<strong>Example 240. Example of the FLexecButton opcode.</strong>
</p>
<div class="example-contents">
<p>See the sections <a class="link" href="UsingRealTime.html" title="Real-Time Audio"><em class="citetitle">Real-time Audio</em></a> and <a class="link" href="CommandFlags.html" title="Csound command line"><em class="citetitle">Command Line Flags</em></a> for more information on using command line flags.</p>
<pre class="programlisting">
<span class="csdtag"><CsoundSynthesizer></span>
<span class="csdtag"><CsOptions></span>
<span class="comment">; Select audio/midi flags here according to platform</span>
<span class="comment">; Audio out Audio in No display</span>
-odac -iadc -d <span class="comment">;;;RT audio I/O</span>
<span class="csdtag"></CsOptions></span>
<span class="csdtag"><CsInstruments></span>
<span class="ohdr">sr</span> <span class="op">=</span> 44100
<span class="ohdr">ksmps</span> <span class="op">=</span> 10
<span class="ohdr">nchnls</span> <span class="op">=</span> 1
<span class="comment">; Example by Jonathan Murphy 2007</span>
<span class="comment">;;; reset amplitude range</span>
<span class="ohdr">0dbfs</span> <span class="op">=</span> 1
<span class="comment">;;; set the base colour for the panel</span>
<span class="opc">FLcolor</span> 100, 0, 200
<span class="comment">;;; define the panel</span>
<span class="opc">FLpanel</span> "FLexecButton", 250, 100, 0, 0
<span class="comment">;;; sliders to control time stretch and pitch</span>
gkstr, gistretch <span class="opc">FLslider</span> "Time", 0.5, 1.5, 0, 6, <span class="op">-</span>1, 10, 60, 150, 20
gkpch, gipitch <span class="opc">FLslider</span> "Pitch", 0.5, 1.5, 0, 6, <span class="op">-</span>1, 10, 60, 200, 20
<span class="comment">;;; set FLexecButton colour</span>
<span class="opc">FLcolor</span> 255, 255, 0
<span class="comment">;;; when this button is pressed, fourier analysis is performed on the file</span>
<span class="comment">;;; "beats.wav", producing the analysis file "beats.pvx"</span>
gipvoc <span class="opc">FLexecButton</span> "csound <span class="op">-</span>U pvanal beats.wav beats.pvx", 60, 20, 20, 20
<span class="comment">;;; set FLexecButton text</span>
<span class="opc">FLsetText</span> "PVOC", gipvoc
<span class="comment">;;; when this button is pressed, instr 10000 is called, exiting</span>
<span class="comment">;;; Csound immediately</span>
<span class="comment">;;; cancel previous colour</span>
<span class="opc">FLcolor</span> <span class="op">-</span>1
<span class="comment">;;; set colour for kill button</span>
<span class="opc">FLcolor</span> 255, 0, 0
gkkill, gikill <span class="opc">FLbutton</span> "X", 1, 1, 1, 20, 20, 100, 20, 0, 10000, 0, 0.1
<span class="comment">;;; cancel previous colour</span>
<span class="opc">FLcolor</span> <span class="op">-</span>1
<span class="comment">;;; set colour for play/stop and pause buttons</span>
<span class="opc">FLcolor</span> 0, 200, 0
<span class="comment">;;; pause and play/stop buttons</span>
gkpause, gipause <span class="opc">FLbutton</span> "@<span class="op">||</span>", 1, 0, 2, 40, 20, 20, 60, <span class="op">-</span>1
gkplay, giplay <span class="opc">FLbutton</span> "@<span class="op">|</span><span class="op">></span>", 1, 0, 2, 40, 20, 80, 60, <span class="op">-</span>1
<span class="comment">;;; end the panel</span>
<span class="opc">FLpanelEnd</span>
<span class="comment">;;; set initial values for time stretch and pitch</span>
<span class="opc">FLsetVal_i</span> 1, gistretch
<span class="opc">FLsetVal_i</span> 1, gipitch
<span class="comment">;;; run the panel</span>
<span class="opc">FLrun</span>
<span class="oblock">instr</span> 1 <span class="comment">; trigger play/stop</span>
<span class="comment">;;; is the play/stop button on or off?</span>
<span class="comment">;;; either way we need to trigger something,</span>
<span class="comment">;;; so we can't just use the value of gkplay</span>
kon <span class="opc">trigger</span> gkplay, 0, 0
koff <span class="opc">trigger</span> gkplay, 1, 1
<span class="comment">;;; if on, start instr 2</span>
<span class="opc">schedkwhen</span> kon, <span class="op">-</span>1, <span class="op">-</span>1, 2, 0, <span class="op">-</span>1
<span class="comment">;;; if off, stop instr 2</span>
<span class="opc">schedkwhen</span> koff, <span class="op">-</span>1, <span class="op">-</span>1, <span class="op">-</span>2, 0, <span class="op">-</span>1
<span class="oblock">endin</span>
<span class="oblock">instr</span> 2
<span class="comment">;;; paused or playing?</span>
<span class="octrl">if</span> (gkpause <span class="op">==</span> 1) <span class="octrl">kgoto</span> <span class="olabel">pause</span>
<span class="octrl">kgoto</span> <span class="olabel">start</span>
<span class="olabel">pause</span><span class="op">:</span>
<span class="comment">;;; if the pause button is on, skip sound production</span>
<span class="octrl">kgoto</span> <span class="olabel">end</span>
<span class="olabel">start</span><span class="op">:</span>
<span class="comment">;;; get the length of the analysis file in seconds</span>
ilen <span class="opc">filelen</span> "beats.pvx"
<span class="comment">;;; determine base frequency of playback</span>
icps <span class="op">=</span> 1<span class="op">/</span>ilen
<span class="comment">;;; create a table over the length of the file</span>
itpt <span class="ohdr">ftgen</span> 0, 0, 513, <span class="op">-</span>7, 0, 512, ilen
<span class="comment">;;; phasor for time control</span>
kphs <span class="opc">phasor</span> icps <span class="op">*</span> gkstr
<span class="comment">;;; use phasor as index into table</span>
kndx <span class="op">=</span> kphs <span class="op">*</span> 512
<span class="comment">;;; read table </span>
ktpt <span class="opc">tablei</span> kndx, itpt
<span class="comment">;;; use value from table as time pointer into file</span>
fsig1 <span class="opc">pvsfread</span> ktpt, "beats.pvx"
<span class="comment">;;; change playback pitch</span>
fsig2 <span class="opc">pvscale</span> fsig1, gkpch
<span class="comment">;;; resynthesize</span>
aout <span class="opc">pvsynth</span> fsig2
<span class="comment">;;; envelope to avoid clicks and clipping</span>
aenv <span class="opc">linsegr</span> 0, 0.3, 0.75, 0.1, 0
aout <span class="op">=</span> aout <span class="op">*</span> aenv
<span class="opc">out</span> aout
<span class="olabel">end</span><span class="op">:</span>
<span class="oblock">endin</span>
<span class="oblock">instr</span> 10000 <span class="comment">; kill</span>
<span class="opc">exitnow</span>
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="stamnt">i</span>1 0 10000
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
</div>
</div>
<p><br class="example-break" />
</p>
</div>
<div class="refsect1" title="See Also">
<a id="idp20822456"></a>
<h2>See Also</h2>
<p>
<a class="link" href="FLbutton.html" title="FLbutton"><em class="citetitle">FLbutton</em></a>,
<a class="link" href="FLbox.html" title="FLbox"><em class="citetitle">FLbox</em></a>,
<a class="link" href="FLbutBank.html" title="FLbutBank"><em class="citetitle">FLbutBank</em></a>,
<a class="link" href="FLprintk.html" title="FLprintk"><em class="citetitle">FLprintk</em></a>,
<a class="link" href="FLprintk2.html" title="FLprintk2"><em class="citetitle">FLprintk2</em></a>,
<a class="link" href="FLvalue.html" title="FLvalue"><em class="citetitle">FLvalue</em></a>
</p>
</div>
<div class="refsect1" title="Credits">
<a id="idp20825872"></a>
<h2>Credits</h2>
<p>Author: Steven Yi</p>
<p>Example by: Jonathan Murphy</p>
<p>New in version 5.05</p>
</div>
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