text: #!/usr/bin/env node
  
  /*
   * Copyright (C) 2017 Alasdair Mercer, !ninja
   *
   * Permission is hereby granted, free of charge, to any person obtaining a copy
   * of this software and associated documentation files (the "Software"), to deal
   * in the Software without restriction, including without limitation the rights
   * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   * copies of the Software, and to permit persons to whom the Software is
   * furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in all
   * copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
   * SOFTWARE.
   */
  
  'use strict';
  
  var blinkt = require('../src/blinkt');
  
  blinkt.setClearOnExit();
  blinkt.setBrightness(0.1);
  
  function showGraph(value, red, green, blue) {
    value *= blinkt.NUM_PIXELS;
  
    for (var i = 0; i < blinkt.NUM_PIXELS; i++) {
      if (value < 0) {
        red = green = blue = 0;
      } else {
        red = Math.floor(Math.min(value, 1) * red);
        green = Math.floor(Math.min(value, 1) * green);
        blue = Math.floor(Math.min(value, 1) * blue);
      }
  
      blinkt.setPixel(i, red, green, blue);
  
      value--;
    }
  
    blinkt.show();
  }
  
  setInterval(function() {
    // Get a value between 0 and 1
    var time = Date.now();
    var value = (Math.sin(time) + 1) / 2;
  
    showGraph(value, 255, 0, 255);
  }, 100);
  