title: color in ggplot2 legend not matching figure
body: <p>I have a problem getting the legend in ggplot2 to correspond to the color in the figure. And I have extra variables in the legend. I have read many posts on similar issues but unfortunately I have not been able to apply those to this situation - successfully at least. I tried using "fill" and "scale_fill_manual()", "theme()" and several others, but to no avail yet. Hopefully I am just missing something simple here, I appreciate any suggestions!</p>
  
  <p>I am making a map and my code right now is:</p>
  
  <pre><code>ggplot()+ geom_map(data=world, map=world,aes(x=long, y=lat, map_id=region),color="white", fill="#7f7f7f", size=0.05)+
     geom_point(aes(x=long.a,y=lat.a, size=var.p, color="red", alpha=0.5))
  </code></pre>
  
  <p>The plot looks like this:</p>
  
  <p><a href="https://i.stack.imgur.com/Nfiy9.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Nfiy9.png" alt="enter image description here"></a></p>