title: Drawing a circle with cos() sin(), no repeat pixel, no gaps?
body: <p>I'm interested in drawing a circle of a vary radius using sin() and cos() functions. </p>
  
  <p>Is there a golden rule to increment the radians so that there isn't multiple plots to the same location and no gaps in the circle drawn on a pixel based display?</p>
  
  <pre><code>x = cos(r) * radius
  y = sin(r) * radius
  r = r + s
  </code></pre>
  
  <p>My guess would be that s is something to do with dividing 2 × PI by the a number derived from the radius?</p>
  
  <p>I'm sure this is either really simple or impossible due to the limitations of floating point calculations.</p>
  
  <p>Thanks for your time</p>
  
  <p>Anthony</p>