Help/UGens/Triggers/Sweep.html

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  24 <p class="p1"><span class="s1"><b>Sweep</b></span><span class="s2"><span class="Apple-tab-span">        </span><span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span></span><b>triggered linear ramp</b></p>
  25 <p class="p2"><br></p>
  26 <p class="p1">superclass: UGen</p>
  27 <p class="p3"><b></b><br></p>
  28 <p class="p1">starts a linear raise by rate/sec from zero when trig input crosses from non-positive to positive<span class="Apple-converted-space"> </span></p>
  29 <p class="p3"><b></b><br></p>
  30 <p class="p1"><b><span class="Apple-tab-span">  </span>*ar(trig, rate)</b></p>
  31 <p class="p1"><b><span class="Apple-tab-span">  </span>*kr(trig, rate)</b></p>
  32 <p class="p3"><b></b><br></p>
  33 <p class="p2"><span class="Apple-tab-span">     </span></p>
  34 <p class="p2"><br></p>
  35 <p class="p2"><br></p>
  36 <p class="p2"><span class="Apple-tab-span">     </span></p>
  37 <p class="p4">// using sweep to modulate sine frequency</p>
  38 <p class="p5">(</p>
  39 <p class="p5">{ <span class="s3">var</span> trig;</p>
  40 <p class="p5"><span class="Apple-tab-span">     </span>trig = <span class="s3">Impulse</span>.kr(<span class="s3">MouseX</span>.kr(0.5, 20, 1));</p>
  41 <p class="p5"><span class="Apple-tab-span">     </span><span class="s3">SinOsc</span>.ar(<span class="s3">Sweep</span>.kr(trig, 700) + 500, 0, 0.2)</p>
  42 <p class="p5">}.play;</p>
  43 <p class="p5">)</p>
  44 <p class="p2"><br></p>
  45 <p class="p2"><br></p>
  46 <p class="p2"><br></p>
  47 <p class="p2"><br></p>
  48 <p class="p2"><br></p>
  49 <p class="p4">// using sweep to index into a buffer</p>
  50 <p class="p2"><br></p>
  51 <p class="p6"><span class="s4">s.sendMsg(</span>"/b_allocRead"<span class="s4">, 0, </span>"sounds/a11wlk01.wav"<span class="s4">);</span></p>
  52 <p class="p2"><br></p>
  53 <p class="p5">(</p>
  54 <p class="p5">{ <span class="s3">var</span> trig;</p>
  55 <p class="p5"><span class="Apple-tab-span">     </span>trig = <span class="s3">Impulse</span>.kr(<span class="s3">MouseX</span>.kr(0.5, 10, 1));</p>
  56 <p class="p5"><span class="Apple-tab-span">     </span><span class="s3">BufRd</span>.ar(1, 0, <span class="s3">Sweep</span>.ar(trig, <span class="s3">BufSampleRate</span>.ir(0)))</p>
  57 <p class="p5">}.play;</p>
  58 <p class="p5">)</p>
  59 <p class="p2"><br></p>
  60 <p class="p4">// backwards, variable offset</p>
  61 <p class="p2"><br></p>
  62 <p class="p5">(</p>
  63 <p class="p5">{ <span class="s3">var</span> trig, pos, rate;</p>
  64 <p class="p5"><span class="Apple-tab-span">     </span>trig = <span class="s3">Impulse</span>.kr(<span class="s3">MouseX</span>.kr(0.5, 10, 1));</p>
  65 <p class="p5"><span class="Apple-tab-span">     </span>rate = <span class="s3">BufSampleRate</span>.ir(0);</p>
  66 <p class="p5"><span class="Apple-tab-span">     </span>pos = <span class="s3">Sweep</span>.ar(trig, rate.neg) + (<span class="s3">BufFrames</span>.ir(0) * <span class="s3">LFNoise0</span>.kr(0.2));</p>
  67 <p class="p5"><span class="Apple-tab-span">     </span><span class="s3">BufRd</span>.ar(1, 0, pos)</p>
  68 <p class="p5">}.play;</p>
  69 <p class="p5">)</p>
  70 <p class="p2"><br></p>
  71 <p class="p2"><br></p>
  72 <p class="p4">// raising rate</p>
  73 <p class="p5">(</p>
  74 <p class="p5">{ <span class="s3">var</span> trig, rate;</p>
  75 <p class="p5"><span class="Apple-tab-span">     </span>trig = <span class="s3">Impulse</span>.kr(<span class="s3">MouseX</span>.kr(0.5, 10, 1));</p>
  76 <p class="p5"><span class="Apple-tab-span">     </span>rate = <span class="s3">Sweep</span>.kr(trig, 2) + 0.5;</p>
  77 <p class="p5"><span class="Apple-tab-span">     </span><span class="s3">BufRd</span>.ar(1, 0, <span class="s3">Sweep</span>.ar(trig, <span class="s3">BufSampleRate</span>.ir(0) * rate))</p>
  78 <p class="p5">}.play;</p>
  79 <p class="p5">)</p>
  80 <p class="p2"><br></p>
  81 <p class="p2"><br></p>
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