title: Plot a curve between two points in canvas
body: <p>Given a set of points, say (10, 10) and (50, 10), how can I plot a curve between them? My geometry is a bit rusty and I'm not sure of which canvas method to use (arc(), quadradicCurveTo(), etc..).</p>
  
  <p>Can anyone point me in the right direction?</p>