title: ggplot2 annotate layer position in R
body: <p>In my plot I have both legends and text annotations. For legends, I can specify </p>
  
  <p><code>legend.justification=c(1,0), legend.position=c(1,0)</code> </p>
  
  <p>to locate the position relative to the plotting region (e.g. topright, bottomleft). However, when I put an annotate layer (<a href="http://docs.ggplot2.org/0.9.3.1/annotate.html" rel="noreferrer">http://docs.ggplot2.org/0.9.3.1/annotate.html</a>), it seems that I can only specify the coordinates of the text</p>
  
  <p><code>annotate("text", x = 8e-7, y = 1e-5, label=data.note, size = 5)</code> </p>
  
  <p>instead of the position of the plotting region (I want to put the text in the bottomleft corner). The length of the text (<code>label</code>) may vary for different plots. Is there a way to achieve this? Thanks!</p>