Help/UGens/Triggers/Poll.html

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  29 <p class="p1"><span class="s1"><b>Poll<span class="Apple-tab-span">     </span> <span class="Apple-converted-space">  <span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span></span></b></span><b>print the current output value of a UGen</b></p>
  30 <p class="p2"><br></p>
  31 <p class="p1"><b>Poll.ar(trig, in, label, trigid)</b></p>
  32 <p class="p1"><b>Poll.kr(trig, in, label, trigid)</b></p>
  33 <p class="p3"><br></p>
  34 <p class="p4"><b>Usage</b></p>
  35 <p class="p3"><br></p>
  36 <p class="p1"><b><span class="Apple-tab-span">  </span>trig<span class="Apple-tab-span">        </span><span class="Apple-tab-span">    </span></b>a non-positive to positive transition telling Poll to return a value</p>
  37 <p class="p1"><b><span class="Apple-tab-span">  </span>in<span class="Apple-tab-span">  </span><span class="Apple-tab-span">    </span></b>the signal you want to poll</p>
  38 <p class="p1"><b><span class="Apple-tab-span">  </span>label<span class="Apple-tab-span">       </span><span class="Apple-tab-span">    </span></b>a string or symbol to be printed with the polled value</p>
  39 <p class="p1"><b><span class="Apple-tab-span">  </span>trigid<span class="Apple-tab-span">      </span></b>if greater then 0, a <b>'/tr' message</b> is sent back to the client (similar to <a href="SendTrig.html"><span class="s2">SendTrig</span></a>)</p>
  40 <p class="p3"><br></p>
  41 <p class="p3"><br></p>
  42 <p class="p1"><b>Poll returns its in signal (and is therefore transparent).<span class="Apple-converted-space"> </span></b></p>
  43 <p class="p3"><br></p>
  44 <p class="p1"><b>WARNING: Printing values from the Server in intensive for the CPU. Poll should be used for debugging purposes.</b></p>
  45 <p class="p5"><br></p>
  46 <p class="p6"><br></p>
  47 <p class="p7">// examples:</p>
  48 <p class="p6"><br></p>
  49 <p class="p8">s.boot;</p>
  50 <p class="p6"><br></p>
  51 <p class="p8">{ <span class="s3">Poll</span>.kr(<span class="s3">Impulse</span>.kr(10), <span class="s3">Line</span>.kr(0, 1, 1), <span class="s4">\test</span>) }.play(s);</p>
  52 <p class="p6"><br></p>
  53 <p class="p7">// multichannel expansion:</p>
  54 <p class="p6"><br></p>
  55 <p class="p8">{ <span class="s3">Poll</span>.kr(<span class="s3">Impulse</span>.kr([10, 5]), <span class="s3">Line</span>.kr(0, [1, 5], [1, 2]), [<span class="s4">\test</span>, <span class="s4">\test2</span>]) }.play(s);</p>
  56 <p class="p6"><br></p>
  57 <p class="p6"><br></p>
  58 <p class="p6"><br></p>
  59 <p class="p7">// using the poll message:</p>
  60 <p class="p6"><br></p>
  61 <p class="p8">{ <span class="s3">SinOsc</span>.ar(375, 0, 1).poll(<span class="s3">Impulse</span>.ar(20), <span class="s4">\test2</span>) }.play(s);</p>
  62 <p class="p6"><br></p>
  63 <p class="p7">// if no arguments are given, the poll is done every 0.1 sec.</p>
  64 <p class="p8">{<span class="Apple-converted-space">  </span><span class="s3">Line</span>.kr(0, 1, 1).poll }.play(s);</p>
  65 <p class="p6"><br></p>
  66 <p class="p6"><br></p>
  67 <p class="p7">// send a '/tr' message back to the client. This can be useful if the server runs on another</p>
  68 <p class="p7">// computer than the client, i.e. the post messages by the server cannot be read locally.</p>
  69 <p class="p6"><br></p>
  70 <p class="p8">o = <span class="s3">OSCresponderNode</span>(s.addr, <span class="s4">'/tr'</span>, {<span class="s3">arg</span> time, resp, msg;</p>
  71 <p class="p8"><span class="Apple-tab-span">     </span>msg.postln;</p>
  72 <p class="p8"><span class="Apple-tab-span">     </span>}).add</p>
  73 <p class="p6"><br></p>
  74 <p class="p8">{<span class="s3">Poll</span>.ar(<span class="s3">Impulse</span>.ar(5), <span class="s3">Line</span>.ar(0, 1, 1), <span class="s4">\test2</span>, 1234)}.play(s);</p>
  75 <p class="p8">{<span class="s3">SinOsc</span>.ar(220, 0, 1).poll(<span class="s3">Impulse</span>.ar(15), <span class="s5">"test"</span>, 1234)}.play(s);</p>
  76 <p class="p6"><span class="Apple-tab-span">     </span></p>
  77 <p class="p8">o.remove;</p>
  78 <p class="p8">s.quit;</p>
  79 <p class="p6"><br></p>
  80 <p class="p6"><br></p>
  81 <p class="p6"><br></p>
  82 <p class="p6"><br></p>
  83 <p class="p7">// This example will kill the server (by outputting NaN).</p>
  84 <p class="p7">// Poll.ar will help us spot why it's happening.</p>
  85 <p class="p7">// Warning: You may need to reboot your server after running this.</p>
  86 <p class="p8">(</p>
  87 <p class="p8">{</p>
  88 <p class="p8"><span class="s3">var</span> cutoff, son;</p>
  89 <p class="p8">cutoff = <span class="s3">LFPar</span>.kr(0.2, 0, 500, 500);</p>
  90 <p class="p8">son = <span class="s3">LPF</span>.ar(<span class="s3">WhiteNoise</span>.ar, cutoff);</p>
  91 <p class="p6"><br></p>
  92 <p class="p7">// Using Poll to debug by spitting out a value if the output hits NaN</p>
  93 <p class="p8"><span class="s3">Poll</span>.ar(if((son&lt;=0)||(son&gt;=0), 0, 1), cutoff, <span class="s5">"Cutoff value which causes NaN:"</span>);</p>
  94 <p class="p6"><br></p>
  95 <p class="p8">son;</p>
  96 <p class="p6"><br></p>
  97 <p class="p8">}.play(s);</p>
  98 <p class="p8">)</p>
  99 <p class="p6"><br></p>
 100 <p class="p6"><br></p>
 101 <p class="p7">// This example polls when someone hits the trigger</p>
 102 <p class="p8">(</p>
 103 <p class="p9"><span class="s6">x = {</span>|t_poll=0|</p>
 104 <p class="p8"><span class="s3">var</span> minfreq, maxfreq, son;</p>
 105 <p class="p8">minfreq = <span class="s3">LFNoise2</span>.ar(0.25, 100, 110);</p>
 106 <p class="p8">maxfreq = <span class="s3">LFNoise2</span>.ar(0.25, 200, 220);</p>
 107 <p class="p6"><br></p>
 108 <p class="p8">son = <span class="s3">Gendy1</span>.ar(minfreq: minfreq, maxfreq: maxfreq, mul: 0.1);</p>
 109 <p class="p6"><br></p>
 110 <p class="p8"><span class="s3">Poll</span>.kr(t_poll, [minfreq, maxfreq], [<span class="s5">"minfreq", "maxfreq"</span>]);</p>
 111 <p class="p6"><br></p>
 112 <p class="p8">son;</p>
 113 <p class="p6"><br></p>
 114 <p class="p8">}.play(s);</p>
 115 <p class="p8">)</p>
 116 <p class="p6"><br></p>
 117 <p class="p7"><span class="s6">x.set(</span><span class="s4">\t_poll</span><span class="s6">, 1); </span>// Hit this whenever you want to know what the parameters are</p>
 118 <p class="p6"><br></p>
 119 <p class="p6"><br></p>
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