panel.xyimage: Scatter plots using emoji-like images
In latticeExtra: Extra Graphical Utilities Based on Lattice

Description Usage Arguments Details Author(s) See Also Examples

Panel function that create scatter plots with emoji-like images for plotting character. Images can be local files or URLs. Only PNG and JPEG images are currently supported.

panel.xyimage(x, y, 
              subscripts,
              groups = NULL,
              pch = NULL,
              cex = 1,
              ...,
              grid = FALSE, abline = NULL)

`x, y`	Data vectors to be plotted.
`subscripts`	An integer vector of subscripts giving indices of the `x` and `y` values in the original data source. See the corresponding entry in `xyplot` for details.
`groups`	A factor defining groups.
`pch`	A character vector giving path(s) or URL(s) of PNG or JPEG files. If `groups` is specified, there should be one value for each level, otherwise this should have length 1. Recycled as necessary.
`cex`	A numeric multiplier for the size of the symbols. As with `pch`, this can be a vector corresponding to levels of `groups`.
`...`	Further arguments are accepted but ignored.
`grid`	A logical flag, character string, or list specifying whether and how a background grid should be drawn. See `panel.xyplot` for details.
`abline`	A numeric vector or list, specifying arguments arguments for `panel.abline`, which is called with those arguments. See `panel.xyplot` for details.

The image sources given by pch are downloaded if necessary and read in every time the panel function is called. If the same images are to be used in multiple panels, it may be more efficient to download them once and provide the file paths rather than provide URLs.

Deepayan Sarkar

panel.xyplot

## Not run: 
alive <- "https://twemoji.maxcdn.com/72x72/1f60a.png"
dead <- "https://twemoji.maxcdn.com/72x72/1f480.png"

dotplot(Titanic,
        scales = list(x = "free"),
        between = list(x = 1),
        panel = panel.xyimage,
        pch = c(dead, alive), grid = "h", 
        main = "Survival on the Titanic",
        xlab = "Number of persons")

## End(Not run)