tests/ggplot_extraction.R

In trackr: Semantic Annotation and Discoverability System for R-Based Artifacts

library(trackr)


library(ggplot2)


## examples from
##      http://www.cookbook-r.com/Graphs
##      https://learnr.files.wordpress.com/2009/08/latbook.pdf
##      http://docs.ggplot2.org/current/index.html
##      http://lmdvr.r-forge.r-project.org/figures/figures.html
if(requireNamespace("mlmRev")) {
    data(Chem97, package = "mlmRev")
    ## and a modified version of its ggplot2 counterpart, from
    ## https://learnr.files.wordpress.com/2009/08/latbook.pdf
    pg <- ggplot(Chem97, aes(gcsescore)) +
        geom_histogram(binwidth = 0.5) +
        facet_wrap(~score) +
        ggtitle(expression(atop("ggplot2 Histogram of gcsescore", atop("facetted by score")))) +
        theme_bw()
    pg

    pgdnames = list(x = "gcsescore", group = list(panel = "score"))
    pgdtypes = list(x = "numeric", group = list(panel = "numeric"))
    pgdlabels = list(x = "gcsescore", y = "count", group = list(panel = "score"))

    ## this test needs to be re-enabled as soon as I put in the workaround for the ggplot2 bug
    stopifnot(#identical(trackr:::dataNames(pg), pgdnames),
        identical(dim(fullData(pg)[[1]]), c(31022L, 2L)),
        identical(names(fullData(pg)[[1]]), c("gcsescore", "score")),
        identical(dataTypes(pg), pgdtypes),
        ## currently failing for ggplot2 2.3 due to extraneous "weight" label
        identical(dataLabels(pg), pgdlabels)
    )
}
set.seed(620)
dsamp <- diamonds[sample(nrow(diamonds), 1000), ]
d <- ggplot(dsamp, aes(carat, price, colour = clarity)) +
  ggtitle("Diamond price by carat and clarity") +
    geom_point() + theme_bw()
d

ddatanames = list(x = "carat", y = "price", group = list(color = "clarity"))

stopifnot(identical(trackr:::dataNames(d),ddatanames),
          identical(names(fullData(d)[[1]]), c("carat", "price", "clarity")),
          ## these will be the same because there's no extra stuff happening
          identical(dataLabels(d), ddatanames))