go.histogram: GO Histogram
In dieterich-lab/CellPlot: Segmented Bar Chart Plot Methods

Plots a histogram, combining multiple topGO analyses into one figure. Bars show the absolute numbers of up- and downregulated genes. Terms that were detected as significantly enriched in the respective analysis are coloured, grey bars indicate no enrichment. In addition, p-values from a one-sided t-test on the significant log fold changes may be included, and are visualized by asterisks at the end of the bars.

go.histogram(framelist, go.alpha = 0.05, gene.alpha = 0.05,
  go.alpha.term = "Elim", gene.alpha.term = "pvalue",
  logfc.term = "log2FoldChange", min.sig = 1, min.genes = 10,
  max.genes = 100, bar.scale = NULL, reorder = T,
  main = "GO enrichment", show.go.id = FALSE, prefix = "",
  show.ttest = F, lab.cex = 1, axis.cex = 1, group.cex = NULL,
  go.selection = NULL, term.selection = NULL, main.cex = 1)

`framelist`	List of TopGO data frames. The frames have to include two additional columns: 'Upregulated' and 'Downregulated', with the numbers of up- and down-regulated genes, respectively.
`go.alpha`	Significance threshold for enrichment. Terms that are not significantly enriched are still displayed using grey bars. Defaults to 0.05.
`gene.alpha`	Significance threshold for the selection of genes. Defaults to 0.05.
`go.alpha.term`	Identifies which column contains the p-values of the enrichment analysis. Defaults to "Elim".
`gene.alpha.term`	Identifies which column contains the p-values of the gene differential expression analysis. Defaults to "pvalue".
`min.sig`	Minimum times a term has to be detected as significantly enriched across all groups to be displayed in the histogram. Defaults to 1.
`min.genes`	Minimum number of genes for a significantly enriched term to be included. Additional to the min.sig filter. Defaults to 10.
`max.genes`	Maximum number of genes for a significantly enriched term to be included. Defaults to 100.
`bar.scale`	If not NULL (the default), set bar height to a fixed value relative to the numeric factor provided. Use to ensure consistency across plots with varying numbers of elements. Returns a warning if the plotting area is too small and uses the relative scale instead.
`reorder`	If TRUE, terms significantly enriched in the same groups appear together. Defaults to TRUE.
`main`	Plot title.
`show.go.id`	If TRUE, shows the GO ID number along with the term.
`show.ttest`	If TRUE, displays p-values from one-sided t-tests beside the bars, coded as asterisks. The p-values need to be included in the input data frames as columns "p.up.adj" and "p.down.adj" (NOTE: make more generic!). Defaults to FALSE.
`lab.cex`	Scalar, Character expansion factor for labels.
`axis.cex`	Scalar, Character expansion factor for axis tick labels.
`group.cex`	Scalar, Character expansion factor for group labels.
`go.selection`	(Optional) Character vector of GO IDs that should be displayed.
`term.selection`	(Optional) Character vector of GO term identifiers that should be displayed.
`main.cex`	Title character expansion.