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    <p>My answer is just a proof of concept to demonstrate the feasibility of this plot using <code>grid</code> and <code>bezier</code>. I use <code>lattice</code> to plot the scene and then <code>grid</code> package in the <code>native</code>. It is just a start, I think you can easily complete it.</p> <p><img src="https://i.stack.imgur.com/IKFVB.png" alt="enter image description here"></p> <pre><code>library(grid) library(lattice) dat &lt;- data.frame(x=c(1,1,2,2), y=c(1,2,1,2), weight=c(2,1,1,2), text=c('B','A','B','A')) cols &lt;- colorRampPalette(c("grey", "green"))(nrow(dat)) xyplot(y~x,data=dat,groups=weight, xlim=extendrange(dat$x,f=1), ylim=extendrange(dat$y,f=1), panel=function(x,y,groups,...){ lapply(seq_along(x),function(i){ grid.roundrect(x[i],y[i], width=.5, height=.5*groups[i], gp=gpar(fill=cols[i],lwd=5,col='blue'), def='native') grid.text(x[i],y[i],label=dat$text[i], gp=gpar(cex=5,col='white'), def='native') }) xx &lt;- c(x[1]+0.25, x[1]+0.25, x[3]-0.25, x[3]-0.25) yy &lt;- c(y[1], y[1], y[3], y[3]) grid.bezier(xx, yy, gp=gpar(lwd=3, fill="black"), arrow=arrow(type="closed"), def='native') xx &lt;- c(x[1]+0.25, 1, 2, x[4]-0.25) yy &lt;- c(y[1], 2, 1, y[4]) grid.bezier(xx, yy, gp=gpar(lwd=3, fill="black"), arrow=arrow(type="closed", length=unit(0.5, "inches")), def='native') xx &lt;- c(x[2]+0.25, x[2]+0.25, x[4]-0.25, x[4]-0.25) yy &lt;- c(y[2], y[2], y[4], y[4]) grid.bezier(xx, yy, gp=gpar(lwd=3, fill="black"), arrow=arrow(type="closed", length=unit(0.5, "inches")), def='native') }) </code></pre>
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    1. COThanks! Looks like a good starting point. Not sure why you put it inside the lattice, there's no need for the axis...
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    2. CO@MaxGordon I Know no need for the axis...but otherwise you need to do scaling manually...
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    3. COOk, although I'll probably try to implement without the lattice - I've done some basic grid stuff and it shouldn't be that difficult. I'm not sure how to structure the input-data, there are start populations and then flows from these - perhaps a "wide" formatted data frame would be the best. Your example has the endpoint size if I understand it correctly, this does not translate to width of the bezier curve's lwd parameter... I'll check your answer in a few days just to make sure that no one has my dream function ready before I start developing my own.
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