title: Change map scale bar color R
body: <p>I have a map plot with black background and other layout elements in black color except the map scale. I have tried changing the graphical parameters but that doesn't change the color of the scale bar.I have been able to change the color of the text/label on the scale but the scale line doesn't show up as white color.<br>
  I am using the "maps" package.</p>
  
  <p>Here is my code : </p>
  
  <pre><code>require(maps)
  map.scale(x=-112.89, y=36.851, ratio=F, metric = T, relwidth=0.2, col ="white")
  </code></pre>
  
  <p>The help file mentions that "Further plotting parameters may be specified as for the command text()" but I do not know how I can change the scale bar(line) color to white.I am still trying to put the map layout image in here but I need to figure out how that works. 
  Any help will be appreciated.  </p>