title: Draw a line from x,y with a given angle and length
body: <p>In Javascript I want to draw a line from x/y with a given length and angle. I don't want to draw a line from x1/y1 to x2/y2. I have an x/y origin, an angle and a length.</p>
  
  <p>The line needs to sit on top of a standard web page at a specific position.</p>
  
  <p>How can I do this?</p>
  
  <p>Thanks</p>