 <code><a href="https://rdrr.io/r/grid/grid.xspline.html">grid::xsplineGrob()</a></code> to convert them into a <code>grid</code> object. We pass the resulting object to <code><a href="https://rdrr.io/r/grid/xsplinePoints.html">grid::xsplinePoints()</a></code>. At this point we now have the coordinates of the alluvium polygons.</p>
<div class="sourceCode" id="cb6"><pre class="downlit sourceCode r">
<code class="sourceCode R">  <span class="co"># Use built plot data to recalculate the locations of the flow p