title: Colouring between lines in Processing
body: <p>Having drawn multiple lines using the sin function, I wondered how you would fill in the gap between each of the two lines</p>
  
  <pre><code>float a = 0.0;
  float inc = TWO_PI/25.0;
  
  for(int i=0; i&lt;100; i=i+4) {
    line(i, 50, i, 50+sin(a)*40.0);
    a = a + inc;
  }
  </code></pre>