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

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  28 <p class="p1"><span class="s1"><b>Pbrown<span class="Apple-tab-span">   </span><span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span></b></span><b>brownian motion pattern</b></p>
  29 <p class="p2"><br></p>
  30 <p class="p1">superclass: Pattern</p>
  31 <p class="p2"><br></p>
  32 <p class="p1"><b>Pbrown(lo, hi, step, length)</b></p>
  33 <p class="p2"><br></p>
  34 <p class="p1">Returns a stream that behaves like a brownian motion.<span class="Apple-converted-space"> </span></p>
  35 <p class="p2"><br></p>
  36 <p class="p1"><b>lo, hi</b> - lower and upper boundary of values<span class="Apple-converted-space">  </span>(default: 0.0 and 1.0)</p>
  37 <p class="p1"><b>step</b> - maximum change per step - the distribution is xrand2.<span class="Apple-converted-space">  </span>(default: 0.125)</p>
  38 <p class="p1"><b>length</b> - number of values produced (default: inf)</p>
  39 <p class="p2"><br></p>
  40 <p class="p2"><br></p>
  41 <p class="p3"><span class="s2"><b>See also:</b> <a href="../../UGens/Noise/BrownNoise.html"><span class="s3">BrownNoise</span></a>, <a href="Pgbrown.html"><span class="s3">Pgbrown</span></a></span></p>
  42 <p class="p2"><br></p>
  43 <p class="p4"><br></p>
  44 <p class="p5">// example</p>
  45 <p class="p4"><br></p>
  46 <p class="p6">(</p>
  47 <p class="p6"><span class="s4">var</span> a;</p>
  48 <p class="p6">a = <span class="s4">Pbrown</span>(0.0, 1.0, 0.1, <span class="s4">inf</span>);</p>
  49 <p class="p6">c = a.asStream.nextN(500);</p>
  50 <p class="p6">w = <span class="s4">Window</span>.new(<span class="s5">"Pbrown"</span>, <span class="s4">Rect</span>(10, 10, 540, 800));</p>
  51 <p class="p5">// plot the values</p>
  52 <p class="p6">c.plot(bounds: <span class="s4">Rect</span>(10, 10, 520, 380), discrete: <span class="s4">true</span>, parent: w);</p>
  53 <p class="p5">// a histogram of the values</p>
  54 <p class="p6">c.histo(500).plot(bounds: <span class="s4">Rect</span>(10, 410, 520, 380), parent: w);</p>
  55 <p class="p6">)</p>
  56 <p class="p4"><br></p>
  57 <p class="p6">(</p>
  58 <p class="p6"><span class="s4">var</span> a;</p>
  59 <p class="p6">a = <span class="s4">Pbrown</span>(0.0, 1.0, 0.2, <span class="s4">inf</span>);</p>
  60 <p class="p6">a.asStream.nextN(1000).plot;</p>
  61 <p class="p6">)</p>
  62 <p class="p4"><br></p>
  63 <p class="p4"><br></p>
  64 <p class="p5">// sound example</p>
  65 <p class="p6">(</p>
  66 <p class="p7"><span class="s4">SynthDef</span><span class="s2">(</span>\help_sinegrain<span class="s2">,<span class="Apple-converted-space"> </span></span></p>
  67 <p class="p6"><span class="Apple-tab-span">     </span>{ <span class="s4">arg</span> out=0, freq=440, sustain=0.05;</p>
  68 <p class="p6"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span><span class="s4">var</span> env;</p>
  69 <p class="p6"><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>
  70 <p class="p6"><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>
  71 <p class="p6"><span class="Apple-tab-span">     </span>}).add;</p>
  72 <p class="p6">)</p>
  73 <p class="p4"><br></p>
  74 <p class="p4"><br></p>
  75 <p class="p6">(</p>
  76 <p class="p6"><span class="s4">var</span> a;</p>
  77 <p class="p6">a = <span class="s4">Pbrown</span>(0.0, 1.0, 0.1, <span class="s4">inf</span>).asStream;</p>
  78 <p class="p6">{</p>
  79 <p class="p6"><span class="Apple-tab-span">     </span>loop {</p>
  80 <p class="p6"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span><span class="s4">Synth</span>(<span class="s6">\help_sinegrain</span>, [<span class="s6">\freq</span>, a.next * 600 + 300]);</p>
  81 <p class="p6"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span>0.02.wait;</p>
  82 <p class="p6"><span class="Apple-tab-span">     </span>}</p>
  83 <p class="p6">}.fork;</p>
  84 <p class="p6">)</p>
  85 <p class="p4"><br></p>
  86 <p class="p4"><br></p>
  87 <p class="p4"><br></p>
  88 <p class="p5">// parallel browninan motions</p>
  89 <p class="p6">(</p>
  90 <p class="p6"><span class="s4">var</span> a, x, f;</p>
  91 <p class="p6">a = <span class="s4">Pbrown</span>(0.0, 1.0, 0.1, <span class="s4">inf</span>);</p>
  92 <p class="p4"><br></p>
  93 <p class="p8"><span class="s2">f = { </span>|pattern, dt=0.02, min=300, max=900|</p>
  94 <p class="p6"><span class="Apple-tab-span">     </span>{</p>
  95 <p class="p6"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span><span class="s4">var</span> x = pattern.asStream;</p>
  96 <p class="p6"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span>loop {</p>
  97 <p class="p6"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span><span class="s4">Synth</span>.grain(<span class="s6">\help_sinegrain</span>, [<span class="s6">\freq</span>, x.next.linexp(0, 1, min, max), <span class="s6">\sustain</span>, dt]);</p>
  98 <p class="p6"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span>dt.wait;</p>
  99 <p class="p6"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span>}</p>
 100 <p class="p6"><span class="Apple-tab-span">     </span>}.fork;</p>
 101 <p class="p6">}.flop;</p>
 102 <p class="p4"><br></p>
 103 <p class="p5">// 3 parallel motions</p>
 104 <p class="p6">f.(a, [0.02, 0.08, 0.16]);</p>
 105 <p class="p6">)</p>
 106 <p class="p4"><br></p>
 107 <p class="p4"><br></p>
 108 <p class="p4"><br></p>
 109 <p class="p4"><br></p>
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