title: Prevent Image from Scaling Proportionally with HTML5 Canvas
body: <p>I would like to be able to drawImage on a HTML5 canvas element where the image is resized to the canvas width but does not adjust the height.  Essentially I want it to crop the height to the canvas height rather than trying to scale the width AND height.</p>
  
  <p>For example, if I drawImage on a canvas of 320 x 150.  I would like my image to scale down to the width of 320 and show the first 150 px of the height.</p>