title: Fix antarctica on a ggplot world map?
body: <p>I want to plot a simple world map with gpplot, but when I do, antarctica gets cut off, because the coordinates don't wrap around, so the path goes back across the whole map, instead of going out the edges. For example:</p>
  
  <pre><code>world_data &lt;- map_data("world")
  
  ggplot() + scale_y_continuous(limits=c(-90,90), expand=c(0,0)) +
  scale_x_continuous(expand=c(0,0)) +
  theme(axis.ticks=element_blank(), axis.title=element_blank(),
        axis.text=element_blank()) +
  geom_polygon(data=world_data, mapping=aes(x=long, y=lat, group=group), fill='grey') 
  </code></pre>
  
  <p>Produces:</p>
  
  <p><img src="https://i.stack.imgur.com/6AR88.png" alt="Map without bottom part of antarctica"></p>
  
  <p>But the sounthern most part of antarctica is missing - it should look like this:</p>
  
  <p><img src="https://i.stack.imgur.com/604AT.gif" alt="enter image description here"></p>
  
  <p>Is there a simple way to fix this problem?</p>