title: Graph flow chart of transition from states
body: <p>I'm trying to find a way to graph something like this in R:</p>
  
  <p><img src="https://i.stack.imgur.com/Ycr5E.png" alt="Image created with inkscape"></p>
  
  <p>It is a transition between states, I want the boxes to be equal to the population size and the arrows to indicate the size of the transition. I've looked at the <a href="http://cran.r-project.org/web/packages/diagram/vignettes/diagram.pdf" rel="noreferrer">Diagram</a> package but it's flow charts seem too crude for this. </p>
  
  <ol>
  <li>Is there a better package that allows this? </li>
  <li>If 1 == FALSE: Is there some other software that is better suited?</li>
  <li>If 1 &amp; 2 == FALSE: I guess the last resort is grid <a href="http://stat.ethz.ch/R-manual/R-devel/library/grid/html/grid.roundrect.html" rel="noreferrer">rectangles</a> and <a href="http://stat.ethz.ch/R-manual/R-devel/library/grid/html/grid.bezier.html" rel="noreferrer">bezier curved arrows</a>, any ideas how to quickly get this off the ground?</li>
  </ol>