Help/Streams-Patterns-Events/Patterns/Pif.html

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  27 <p class="p1"><span class="s1"><b>Pif <span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span></b></span><b>Pattern-based conditional expression.</b></p>
  28 <p class="p2"><br></p>
  29 <p class="p1">superclass: <a href="Pattern.html"><span class="s2">Pattern</span></a></p>
  30 <p class="p2"><br></p>
  31 <p class="p1"><b>Pif(condition, iftrue, iffalse, default)</b></p>
  32 <p class="p2"><br></p>
  33 <p class="p1"><b>condition</b>: <span class="Apple-tab-span">   </span>A pattern or stream returning a Boolean value.</p>
  34 <p class="p1"><b>iftrue</b>: <span class="Apple-tab-span">      </span><span class="Apple-tab-span">    </span>This stream is evaluated if the Boolean is true.</p>
  35 <p class="p1"><b>iffalse</b>: <span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span>This stream is evaluated if the Boolean is false.</p>
  36 <p class="p1"><b>default</b>: <span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span>This value (not stream) is returned if "iftrue" or "iffalse" return nil at any time.</p>
  37 <p class="p2"><br></p>
  38 <p class="p2"><br></p>
  39 <p class="p3">p = <span class="s3">Pif</span>(<span class="s3">Pfunc</span>({ 0.3.coin }), <span class="s3">Pwhite</span>(0, 9, <span class="s3">inf</span>), <span class="s3">Pwhite</span>(100, 109, <span class="s3">inf</span>)).asStream;</p>
  40 <p class="p3">p.nextN(20);</p>
  41 <p class="p4"><br></p>
  42 <p class="p5">// 7 of the 20 values, or roughly 30%, are in the 0-9 range:</p>
  43 <p class="p4"><br></p>
  44 <p class="p3">[ 105, 107, 107, 8, 100, 3, 105, 5, 107, 106, 1, 104, 8, 102, 102, 4, 108, 8, 109, 101 ]</p>
  45 <p class="p2"><br></p>
  46 <p class="p4"><br></p>
  47 <p class="p6">// sound example</p>
  48 <p class="p3">(</p>
  49 <p class="p7"><span class="s4">SynthDef</span><span class="s5">(</span>\help_sinegrain<span class="s5">,<span class="Apple-converted-space"> </span></span></p>
  50 <p class="p3"><span class="Apple-tab-span">     </span>{ <span class="s4">arg</span> out=0, freq=440, sustain=0.05;</p>
  51 <p class="p3"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span><span class="s4">var</span> env;</p>
  52 <p class="p3"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span>env = <span class="s4">EnvGen</span>.kr(<span class="s4">Env</span>.perc(0.01, sustain, 0.2), doneAction:2);</p>
  53 <p class="p3"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span><span class="s4">Out</span>.ar(out, <span class="s4">SinOsc</span>.ar(freq, 0, env))</p>
  54 <p class="p3"><span class="Apple-tab-span">     </span>}).add;</p>
  55 <p class="p3">)</p>
  56 <p class="p4"><br></p>
  57 <p class="p4"><br></p>
  58 <p class="p3">(</p>
  59 <p class="p3"><span class="s3">var</span> a;</p>
  60 <p class="p3">a = <span class="s3">Pif</span>(<span class="s3">Pfunc</span>({ 0.3.coin }), <span class="s3">Pn</span>(<span class="s3">Pseries</span>(0.5, 0.1, 10)), <span class="s3">Pn</span>(<span class="s3">Pseries</span>(6, -0.1, 10))).asStream;</p>
  61 <p class="p3">{</p>
  62 <p class="p3"><span class="Apple-tab-span">     </span>loop {</p>
  63 <p class="p3"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span><span class="s3">Synth</span>(<span class="s6">\help_sinegrain</span>, [<span class="s6">\freq</span>, a.next * 600 + 300]);</p>
  64 <p class="p3"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span>0.2.wait;</p>
  65 <p class="p3"><span class="Apple-tab-span">     </span>}</p>
  66 <p class="p3">}.fork;</p>
  67 <p class="p3">)</p>
  68 <p class="p4"><br></p>
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