title: "zoom"/"scale" with coord_polar()
body: <p>I've got a polar plot which uses geom_smooth(). The smoothed loess line though is very small and rings around the center of the plot. I'd like to "zoom in" so you can see it better.</p>
  
  <p>Using something like <code>scale_y_continuous(limits = c(-.05,.7))</code> will make the geom_smooth ring bigger, but it will also alter it because it will recompute with the datapoints limited by the <code>limits = c(-.05,.7)</code> argument. </p>
  
  <p>For a Cartesian plot I could use something like <code>coord_cartesian(ylim = c(-.05,.7))</code> which would clip the chart but not the underlying data. However I can see no way to do this with <code>coord_polar()</code></p>
  
  <p>Any ideas? I thought there might be a way to do this with <code>grid.clip()</code> in the grid package but I am not having much luck.</p>
  
  <p>Any ideas?</p>
  
  <p>What my plot looks like now, note "higher" red line:
  <a href="https://i.stack.imgur.com/7eNQ0.png" rel="noreferrer"><img src="https://i.stack.imgur.com/7eNQ0.png" alt="Current plot, note larger red line, but its small."></a></p>
  
  <p>What I'd like to draw:
  <a href="https://i.stack.imgur.com/TDQUe.png" rel="noreferrer"><img src="https://i.stack.imgur.com/TDQUe.png" alt="What I&#39;d like to get"></a></p>
  
  <p>What I get when I use <code>scale_y_continuous()</code> note "higher" blue line, also it's still not that big.
  <a href="https://i.stack.imgur.com/8ZmhU.png" rel="noreferrer"><img src="https://i.stack.imgur.com/8ZmhU.png" alt="What I get with &lt;code&gt;scale_y_continuous()&lt;/code&gt; note the blue line is now bigger and its still not that big."></a></p>