Help/Control/Warp.html

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  33 <p class="p1"><span class="s1"><b>Warp<span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span></b></span><b>specification of a shape for a mapping of numerical input<span class="Apple-converted-space"> </span></b></p>
  34 <p class="p2"><br></p>
  35 <p class="p3"><b>Inherits from: </b><a href="../Core/Object.html"><span class="s2"><b>Object</b></span></a><b><span class="Apple-converted-space"> </span></b></p>
  36 <p class="p4"><br></p>
  37 <p class="p3">The subclasses of Warp specify translations from input (a number) to an output (another number).<span class="Apple-converted-space"> </span><b> </b>This is an abstract class – already available shapes are <i>linear</i>, <i>exponential</i>, <i>sine</i>, <i>cosine</i>, <i>decibel</i>, <i>curve</i> (this is similar to the curves in envelopes, see also <a href="Env.html"><span class="s2">Env</span></a>).<span class="Apple-converted-space"> </span></p>
  38 <p class="p2"><br></p>
  39 <p class="p3">Warps are internally created by <a href="ControlSpec.html"><span class="s2">ControlSpec</span></a>. Usually they are created by the message <b>asWarp</b>, understood by symbols and numbers. A warp has a <a href="Spec.html"><span class="s2">Spec</span></a> to specify a certain range of input and output values.</p>
  40 <p class="p2"><br></p>
  41 <p class="p5"><span class="s3"><span class="Apple-tab-span">    </span></span>// create a new warp:</p>
  42 <p class="p6"><span class="Apple-tab-span">     </span>a = <span class="s4">\exp</span>.asWarp;</p>
  43 <p class="p6"><span class="Apple-tab-span">     </span>a = -4.asWarp; <span class="s5">// a curve warp;</span></p>
  44 <p class="p2"><br></p>
  45 <p class="p7"><b><span class="Apple-tab-span">  </span>map (value)</b></p>
  46 <p class="p8"><b><span class="Apple-tab-span">  </span></b></p>
  47 <p class="p7"><b><span class="Apple-tab-span">  </span><span class="Apple-tab-span">    </span></b>Maps and constrains a <b>value</b> between 0 and 1 to the output domain.</p>
  48 <p class="p8"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span></p>
  49 <p class="p9"><br></p>
  50 <p class="p7"><b><span class="Apple-tab-span">  </span>unmap (value)</b></p>
  51 <p class="p7"><b><span class="Apple-tab-span">  </span></b>in the output domain to a value in the range between 0 and 1.</p>
  52 <p class="p8"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span></p>
  53 <p class="p10"><span class="s6"><span class="Apple-tab-span">   </span></span>g = -3.asWarp;</p>
  54 <p class="p11"><span class="Apple-tab-span">    </span>g.map(0.5);</p>
  55 <p class="p11"><span class="Apple-tab-span">    </span>g.unmap(0.9);<span class="s5"><span class="Apple-tab-span">      </span></span></p>
  56 <p class="p9"><span class="Apple-tab-span">     </span></p>
  57 <p class="p12"><span class="s7"><span class="Apple-tab-span">   </span></span>// fore and back translation should be identical:</p>
  58 <p class="p11"><span class="Apple-tab-span">    </span>g.unmap(g.map(0.5));</p>
  59 <p class="p8"><b><span class="Apple-tab-span">  </span></b></p>
  60 <p class="p2"><br></p>
  61 <p class="p4"><span class="Apple-tab-span">     </span></p>
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