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<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">
<a id="idm281472936255192"></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" 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">
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</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">
<a id="idm281472936210056"></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">
<a id="idm281472936207768"></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">
<a id="idm281472936198104"></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="idm281472936196232"></a>
<p class="title">
<strong>Example 288. 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>
<div class="refsect1">
<a id="idm281472769001816"></a>
<pre class="programlisting">
<span class="nt"><CsoundSynthesizer></span>
<span class="nt"><CsOptions></span>
<span class="c1">; Select audio/midi flags here according to platform</span>
<span class="c1">; Audio out Audio in No display</span>
-odac -iadc -d <span class="c1">;;;RT audio I/O</span>
<span class="nt"></CsOptions></span>
<span class="nt"><CsInstruments></span>
<span class="vg">sr</span> <span class="o">=</span> <span class="mi">44100</span>
<span class="vg">ksmps</span> <span class="o">=</span> <span class="mi">10</span>
<span class="vg">nchnls</span> <span class="o">=</span> <span class="mi">1</span>
<span class="c1">; Example by Jonathan Murphy 2007</span>
<span class="c1">;;; reset amplitude range</span>
<span class="vg">0dbfs</span> <span class="o">=</span> <span class="mi">1</span>
<span class="c1">;;; set the base colour for the panel</span>
<span class="nb">FLcolor</span> <span class="mi">100</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">200</span>
<span class="c1">;;; define the panel</span>
<span class="nb">FLpanel</span> <span class="s">"FLexecButton"</span><span class="p">,</span> <span class="mi">250</span><span class="p">,</span> <span class="mi">100</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">0</span>
<span class="c1">;;; sliders to control time stretch and pitch</span>
gk<span class="n">str</span><span class="p">,</span> gi<span class="n">stretch</span> <span class="nb">FLslider</span> <span class="s">"Time"</span><span class="p">,</span> <span class="mf">0.5</span><span class="p">,</span> <span class="mf">1.5</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">6</span><span class="p">,</span> <span class="o">-</span><span class="mi">1</span><span class="p">,</span> <span class="mi">10</span><span class="p">,</span> <span class="mi">60</span><span class="p">,</span> <span class="mi">150</span><span class="p">,</span> <span class="mi">20</span>
gk<span class="n">pch</span><span class="p">,</span> gi<span class="n">pitch</span> <span class="nb">FLslider</span> <span class="s">"Pitch"</span><span class="p">,</span> <span class="mf">0.5</span><span class="p">,</span> <span class="mf">1.5</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">6</span><span class="p">,</span> <span class="o">-</span><span class="mi">1</span><span class="p">,</span> <span class="mi">10</span><span class="p">,</span> <span class="mi">60</span><span class="p">,</span> <span class="mi">200</span><span class="p">,</span> <span class="mi">20</span>
<span class="c1">;;; set FLexecButton colour</span>
<span class="nb">FLcolor</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">0</span>
<span class="c1">;;; when this button is pressed, fourier analysis is performed on the file</span>
<span class="c1">;;; "beats.wav", producing the analysis file "beats.pvx"</span>
gi<span class="n">pvoc</span> <span class="nb">FLexecButton</span> <span class="s">"csound -U pvanal beats.wav beats.pvx"</span><span class="p">,</span> <span class="mi">60</span><span class="p">,</span> <span class="mi">20</span><span class="p">,</span> <span class="mi">20</span><span class="p">,</span> <span class="mi">20</span>
<span class="c1">;;; set FLexecButton text</span>
<span class="nb">FLsetText</span> <span class="s">"PVOC"</span><span class="p">,</span> gi<span class="n">pvoc</span>
<span class="c1">;;; when this button is pressed, instr 10000 is called, exiting</span>
<span class="c1">;;; Csound immediately</span>
<span class="c1">;;; cancel previous colour</span>
<span class="nb">FLcolor</span> <span class="o">-</span><span class="mi">1</span>
<span class="c1">;;; set colour for kill button</span>
<span class="nb">FLcolor</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">0</span>
gk<span class="n">kill</span><span class="p">,</span> gi<span class="n">kill</span> <span class="nb">FLbutton</span> <span class="s">"X"</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">20</span><span class="p">,</span> <span class="mi">20</span><span class="p">,</span> <span class="mi">100</span><span class="p">,</span> <span class="mi">20</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">10000</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mf">0.1</span>
<span class="c1">;;; cancel previous colour</span>
<span class="nb">FLcolor</span> <span class="o">-</span><span class="mi">1</span>
<span class="c1">;;; set colour for play/stop and pause buttons</span>
<span class="nb">FLcolor</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">200</span><span class="p">,</span> <span class="mi">0</span>
<span class="c1">;;; pause and play/stop buttons</span>
gk<span class="n">pause</span><span class="p">,</span> gi<span class="n">pause</span> <span class="nb">FLbutton</span> <span class="s">"@||"</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">40</span><span class="p">,</span> <span class="mi">20</span><span class="p">,</span> <span class="mi">20</span><span class="p">,</span> <span class="mi">60</span><span class="p">,</span> <span class="o">-</span><span class="mi">1</span>
gk<span class="n">play</span><span class="p">,</span> gi<span class="n">play</span> <span class="nb">FLbutton</span> <span class="s">"@|>"</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">40</span><span class="p">,</span> <span class="mi">20</span><span class="p">,</span> <span class="mi">80</span><span class="p">,</span> <span class="mi">60</span><span class="p">,</span> <span class="o">-</span><span class="mi">1</span>
<span class="c1">;;; end the panel</span>
<span class="nb">FLpanelEnd</span>
<span class="c1">;;; set initial values for time stretch and pitch</span>
<span class="nb">FLsetVal_i</span> <span class="mi">1</span><span class="p">,</span> gi<span class="n">stretch</span>
<span class="nb">FLsetVal_i</span> <span class="mi">1</span><span class="p">,</span> gi<span class="n">pitch</span>
<span class="c1">;;; run the panel</span>
<span class="nb">FLrun</span>
<span class="kd">instr</span> <span class="nf">1</span> <span class="c1">; trigger play/stop</span>
<span class="c1">;;; is the play/stop button on or off?</span>
<span class="c1">;;; either way we need to trigger something,</span>
<span class="c1">;;; so we can't just use the value of gkplay</span>
k<span class="n">on</span> <span class="nb">trigger</span> gk<span class="n">play</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">0</span>
k<span class="n">off</span> <span class="nb">trigger</span> gk<span class="n">play</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">1</span>
<span class="c1">;;; if on, start instr 2</span>
<span class="nb">schedkwhen</span> k<span class="n">on</span><span class="p">,</span> <span class="o">-</span><span class="mi">1</span><span class="p">,</span> <span class="o">-</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="o">-</span><span class="mi">1</span>
<span class="c1">;;; if off, stop instr 2</span>
<span class="nb">schedkwhen</span> k<span class="n">off</span><span class="p">,</span> <span class="o">-</span><span class="mi">1</span><span class="p">,</span> <span class="o">-</span><span class="mi">1</span><span class="p">,</span> <span class="o">-</span><span class="mi">2</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="o">-</span><span class="mi">1</span>
<span class="kd">endin</span>
<span class="kd">instr</span> <span class="nf">2</span>
<span class="c1">;;; paused or playing?</span>
<span class="k">if</span> <span class="p">(</span>gk<span class="n">pause</span> <span class="o">==</span> <span class="mi">1</span><span class="p">)</span> <span class="k">kgoto</span> <span class="nl">pause</span>
<span class="k">kgoto</span> <span class="nl">start</span>
<span class="nl">pause</span><span class="p">:</span>
<span class="c1">;;; if the pause button is on, skip sound production</span>
<span class="k">kgoto</span> <span class="nl">end</span>
<span class="nl">start</span><span class="p">:</span>
<span class="c1">;;; get the length of the analysis file in seconds</span>
i<span class="n">len</span> <span class="nb">filelen</span> <span class="s">"beats.pvx"</span>
<span class="c1">;;; determine base frequency of playback</span>
i<span class="n">cps</span> <span class="o">=</span> <span class="mi">1</span><span class="o">/</span>i<span class="n">len</span>
<span class="c1">;;; create a table over the length of the file</span>
i<span class="n">tpt</span> <span class="nb">ftgen</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">513</span><span class="p">,</span> <span class="o">-</span><span class="mi">7</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">512</span><span class="p">,</span> i<span class="n">len</span>
<span class="c1">;;; phasor for time control</span>
k<span class="n">phs</span> <span class="nb">phasor</span> i<span class="n">cps</span> <span class="o">*</span> gk<span class="n">str</span>
<span class="c1">;;; use phasor as index into table</span>
k<span class="n">ndx</span> <span class="o">=</span> k<span class="n">phs</span> <span class="o">*</span> <span class="mi">512</span>
<span class="c1">;;; read table </span>
k<span class="n">tpt</span> <span class="nb">tablei</span> k<span class="n">ndx</span><span class="p">,</span> i<span class="n">tpt</span>
<span class="c1">;;; use value from table as time pointer into file</span>
<span class="n">fsig1</span> <span class="nb">pvsfread</span> k<span class="n">tpt</span><span class="p">,</span> <span class="s">"beats.pvx"</span>
<span class="c1">;;; change playback pitch</span>
<span class="n">fsig2</span> <span class="nb">pvscale</span> <span class="n">fsig1</span><span class="p">,</span> gk<span class="n">pch</span>
<span class="c1">;;; resynthesize</span>
a<span class="n">out</span> <span class="nb">pvsynth</span> <span class="n">fsig2</span>
<span class="c1">;;; envelope to avoid clicks and clipping</span>
a<span class="n">env</span> <span class="nb">linsegr</span> <span class="mi">0</span><span class="p">,</span> <span class="mf">0.3</span><span class="p">,</span> <span class="mf">0.75</span><span class="p">,</span> <span class="mf">0.1</span><span class="p">,</span> <span class="mi">0</span>
a<span class="n">out</span> <span class="o">=</span> a<span class="n">out</span> <span class="o">*</span> a<span class="n">env</span>
<span class="nb">out</span> a<span class="n">out</span>
<span class="nl">end</span><span class="p">:</span>
<span class="kd">endin</span>
<span class="kd">instr</span> <span class="nf">10000</span> <span class="c1">; kill</span>
<span class="nb">exitnow</span>
<span class="kd">endin</span>
<span class="nt"></CsInstruments></span>
<span class="nt"><CsScore></span>
<span class="nb">i</span><span class="mi">1</span> <span class="mi">0</span> <span class="mi">10000</span>
<span class="nb">e</span>
<span class="nt"></CsScore></span>
<span class="nt"></CsoundSynthesizer></span>
</pre>
</div>
</div>
</div>
<p><br class="example-break" />
</p>
</div>
<div class="refsect1">
<a id="idm281472936191944"></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">
<a id="idm281472936185096"></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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