title: Resize a chart before printing with Highcharts
body: <p>I have a chart without height or width. </p>
  
  <p>When I click on the print button, I want to obtain a taller and larger graph. I tried setSize() but since I don't know the original size of my graph (because there is not), I can't resize it like it was before and I end up with an enormous graph.
  I also tried to create a copy of the chart (by changing the renderTo, width and height attributes) inside another div but didn't suceed. It's been several hours and i'm all confused.</p>
  
  <p>What should i do to stretch my graph in order to print it without modifing the original one ?</p>
  
  <p>Thanks for your help.</p>