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POHow do you relate ggplot2 grobs back to the data?
 

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  1. POHow do you relate ggplot2 grobs back to the data?
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    <p>Given a ggplot of, for example, points, how would you find out the row of data that a given point corresponded to?</p> <p>A sample plot:</p> <pre><code>library(ggplot2) (p &lt;- ggplot(mtcars, aes(mpg, wt)) + geom_point() + facet_wrap(~ gear) ) </code></pre> <p>We can get the grobs that contain points with <code>grid.ls</code> + <code>grid.get</code>.</p> <pre><code>grob_names &lt;- grid.ls(print = FALSE)$name point_grob_names &lt;- grob_names[grepl("point", grob_names)] point_grobs &lt;- lapply(point_grob_names, grid.get) </code></pre> <p>This last variable contains details of the x-y coordinates, and pointsize, etc. (try <code>unclass(point_grobs[[1]])</code>), but it isn't obvious how I get the row of data in <code>mtcars</code> that each point corresponds to.</p> <hr> <p>To answer kohske's question about why am I doing this, I'm using <code>gridSVG</code> to create an interactive scatterplot. When you roll the mouse over a point, I want to display contextual information. In the mtcars example, I could show a tooltip with the name of the car or other values from that row of the data frame.</p> <p>My hacky idea so far is to include an <code>id</code> column as an invisible text label:</p> <pre><code>mtcars$id &lt;- seq_len(nrow(mtcars)) p + geom_text(aes(label = id), colour = NA) </code></pre> <p>Then traverse the tree of grobs from the point grob to the text grob, and display the row of the dataset indexed by the label.</p> <p>This is fiddly and not very generalisable. If there's a way to store the <code>id</code> value within the point grob, it would be much cleaner.</p>
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    1. USRichie Cotton
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    1. CONo easy way. What is your final goal? There may be alternatives.
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      1. USkohske
    2. CO@kohske: Too long for a comment, so I've updated the question to explain what I'm doing.
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    3. COVery interesting. I understand your purpose. Unfortunately we have no way to access data through grob (even in the next release, probably). But maybe it will be useful to have information about data (especially when `stat = "identity"). I will discuss.
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