title: How to create a ruler a tool for canvas?
body: <p>Like the standard paint program in windows, I'm trying to create a very basic sketch canvas program where the  the user can select a ruler tool to draw with on the canvas. How do I achieve this?</p>
  
  <p>I'm quite a beginner so I'd appreciate if the answer is as simple as possible...</p>
  
  <p>Thanks!!</p>