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    <p>Try this:</p> <pre><code>library(ggplot2) library(gridSVG) library(proto) library(rjson) mtcars2 &lt;- data.frame(mtcars, names = rownames(mtcars)) geom_point2 &lt;- function (...) { GeomPoint2$new(...) } GeomPoint2 &lt;- proto(ggplot2:::Geom, { objname &lt;- "point" draw_groups &lt;- function(., ...) .$draw(...) draw &lt;- function(., data, scales, coordinates, na.rm = FALSE, ...) { data &lt;- remove_missing(data, na.rm, c("x", "y", "size", "shape"), name = "geom_point") if (empty(data)) return(zeroGrob()) name &lt;- paste(.$my_name(), data$PANEL[1], sep = ".") with(coord_transform(coordinates, data, scales), ggname(name, pointsGrob(x, y, size=unit(size, "mm"), pch=shape, gp=gpar( col=alpha(colour, alpha), fill = alpha(fill, alpha), label = label, fontsize = size * .pt))) ) } draw_legend &lt;- function(., data, ...) { data &lt;- aesdefaults(data, .$default_aes(), list(...)) with(data, pointsGrob(0.5, 0.5, size=unit(size, "mm"), pch=shape, gp=gpar( col = alpha(colour, alpha), fill = alpha(fill, alpha), label = label, fontsize = size * .pt) ) ) } default_stat &lt;- function(.) StatIdentity required_aes &lt;- c("x", "y") default_aes &lt;- function(.) aes(shape=16, colour="black", size=2, fill = NA, alpha = NA, label = NA) }) p &lt;- ggplot(mtcars2, aes(mpg, wt, label = names)) + geom_point2() +facet_wrap(~ gear) print(p) grob_names &lt;- grid.ls(print = FALSE)$name point_grob_names &lt;- sort(grob_names[grepl("point", grob_names)]) point_grobs_labels &lt;- lapply(point_grob_names, function(x) grid.get(x)$gp$label) jlabel &lt;- toJSON(point_grobs_labels) grid.text("value", 0.05, 0.05, just = c(0, 0), name = "text_place", gp = gpar(col = "red")) script &lt;- ' var txt = null; function f() { var id = this.id.match(/geom_point.([0-9]+)\\.points.*\\.([0-9]+)$/); txt.textContent = label[id[1]-1][id[2]-1]; } window.addEventListener("load",function(){ var es = document.getElementsByTagName("circle"); for (i=0; i&lt;es.length; ++i) es[i].addEventListener("mouseover", f, false); txt = (document.getElementById("text_place").getElementsByTagName("tspan"))[0]; },false); ' grid.script(script = paste("var label = ", jlabel)) grid.script(script = script) gridToSVG() </code></pre> <p>there were no big changes, but I had to add</p> <pre><code>mtcars2 &lt;- data.frame(mtcars, names = rownames(mtcars)) </code></pre> <p>and then</p> <pre><code>p &lt;- ggplot(mtcars, aes(mpg, wt, label = rownames(mtcars))) + geom_point2() + facet_wrap(~ gear) </code></pre> <p>also changes to</p> <pre><code>p &lt;- ggplot(mtcars2, aes(mpg, wt, label = names)) + geom_point2() +facet_wrap(~ gear) </code></pre> <p>because we have <code>rownames(mtcars)</code></p> <pre><code>rownames(mtcars) [1] "Mazda RX4" "Mazda RX4 Wag" "Datsun 710" "Hornet 4 Drive" [5] "Hornet Sportabout" "Valiant" "Duster 360" "Merc 240D" [9] "Merc 230" "Merc 280" "Merc 280C" "Merc 450SE" ..... </code></pre> <p>and then labels (which we manage to get with other modifications) remain the same, i.e. not rearranged by <code>gears</code>, only split by it:</p> <pre><code>point_grobs_labels [[1]] [1] "Mazda RX4" "Mazda RX4 Wag" "Datsun 710" "Hornet 4 Drive" [5] "Hornet Sportabout" "Valiant" "Duster 360" "Merc 240D" [9] "Merc 230" "Merc 280" "Merc 280C" "Merc 450SE" [13] "Merc 450SL" "Merc 450SLC" "Cadillac Fleetwood" [[2]] .... </code></pre> <p>but having these label names as a column fixes the problem. </p> <pre><code>point_grobs_labels [[1]] [1] "Hornet 4 Drive" "Hornet Sportabout" "Valiant" "Duster 360" [5] "Merc 450SE" "Merc 450SL" "Merc 450SLC" "Cadillac Fleetwood" [9] "Lincoln Continental" "Chrysler Imperial" "Toyota Corona" "Dodge Challenger" [13] "AMC Javelin" "Camaro Z28" "Pontiac Firebird" [[2]] .... </code></pre>
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    1. CONice! Thank you! I was looking for a full, working example just like this one. I have a couple of questions, though: what role does "proto" play in the script? You're using it to redefine geom_point, right? I'm interested in creating interactive plots out of ggplot2 graphs I made . Can you recommend any tutorial/source on getting R to work with Javascript with RJSON and creating SVGs?
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    2. CO@MatteoS, Unfortunately, I can't help you much here, mainly I just tried to find a solution to this particular problem. But you might be right, possibly redefining `geom_point` allows us to use these labels, which I would call the base at least in this case. So, I would offer you to explore this example, especially Javascript, `grid.get()` and `grid.ls()` parts.
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    3. COOk, thanks for your help. Here is your well-deserved bounty!
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