Help/BinaryOps/lessthan.html

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  28 <p class="p1"><br></p>
  29 <p class="p2"><b>&lt;<span class="Apple-tab-span">      </span><span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span>less than</b></p>
  30 <p class="p3"><br></p>
  31 <p class="p4"><b>BinaryOperator</b></p>
  32 <p class="p3"><br></p>
  33 <p class="p4"><b>a &lt; b</b></p>
  34 <p class="p3"><br></p>
  35 <p class="p4">Result is 1 if a &lt; b, otherwise it is 0. This can be useful for triggering purposes, among other things:</p>
  36 <p class="p5"><br></p>
  37 <p class="p6">s = <span class="s1">Server</span>.local;</p>
  38 <p class="p6">s.boot;</p>
  39 <p class="p7"><br></p>
  40 <p class="p8"><span class="s2">( </span>// trigger an envelope</p>
  41 <p class="p6">{</p>
  42 <p class="p6"><span class="Apple-tab-span">     </span><span class="s1">var</span> trig;</p>
  43 <p class="p6"><span class="Apple-tab-span">     </span>trig = <span class="s1">SinOsc</span>.ar(1) &lt; 0;</p>
  44 <p class="p6"><span class="Apple-tab-span">     </span><span class="s1">Out</span>.ar(0,</p>
  45 <p class="p6"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span><span class="s1">EnvGen</span>.kr(<span class="s1">Env</span>.perc, trig, doneAction: 0)<span class="Apple-converted-space"> </span></p>
  46 <p class="p6"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span>* <span class="s1">SinOsc</span>.ar(440,0,0.1)</p>
  47 <p class="p6"><span class="Apple-tab-span">     </span>)</p>
  48 <p class="p6">}.play(s);)</p>
  49 <p class="p7"><br></p>
  50 <p class="p8"><span class="s2">( </span>// trigger a synth</p>
  51 <p class="p9"><span class="s1">SynthDef</span><span class="s2">(</span>"help-EnvGen"<span class="s2">,{ </span><span class="s1">arg</span><span class="s2"> out=0;</span></p>
  52 <p class="p6"><span class="Apple-tab-span">     </span><span class="s1">Out</span>.ar(out,</p>
  53 <p class="p6"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span><span class="s1">EnvGen</span>.kr(<span class="s1">Env</span>.perc,1.0,doneAction: 2)<span class="Apple-converted-space"> </span></p>
  54 <p class="p6"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span>* <span class="s1">SinOsc</span>.ar(440,0,0.1)</p>
  55 <p class="p6"><span class="Apple-tab-span">     </span>)</p>
  56 <p class="p6">}).send(s);</p>
  57 <p class="p7"><br></p>
  58 <p class="p8">// This synth has no output. It only checks amplitude of input and looks for a transition from &gt; 0.2</p>
  59 <p class="p8">// to &lt; 0.2</p>
  60 <p class="p7"><br></p>
  61 <p class="p9"><span class="s1">SynthDef</span><span class="s2">(</span>"help-&lt; trig"<span class="s2">, {</span></p>
  62 <p class="p6"><span class="Apple-tab-span">     </span><span class="s1">SendTrig</span>.kr(<span class="s1">Amplitude</span>.kr(<span class="s1">SoundIn</span>.ar(0)) &lt;= 0.2);</p>
  63 <p class="p6">}).play(s);</p>
  64 <p class="p10"><br></p>
  65 <p class="p8">// responder to trigger synth</p>
  66 <p class="p6"><span class="s1">OSCresponderNode</span>(s.addr,<span class="s3">'/tr'</span>,{ <span class="s4">"triggered"</span>.postln; <span class="s1">Synth</span>.new(<span class="s4">"help-EnvGen"</span>) }).add;</p>
  67 <p class="p6">)</p>
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