Trim off empty cells.
This function detects rows and columns that does not contain any grobs and removes thewm from the gtable. If the rows and/or columns removed had a non-zero height/width the relative layout of the gtable may change.
gtable_trim(x)
x |
a gtable object |
A gtable object
library(grid) rect <- rectGrob(gp = gpar(fill = "black")) base <- gtable(unit(c(2, 2, 2), "cm"), unit(c(2, 2, 2), "cm")) center <- gtable_add_grob(base, rect, 2, 2) plot(center) plot(gtable_trim(center)) col <- gtable_add_grob(base, rect, 1, 2, 3, 2) plot(col) plot(gtable_trim(col)) row <- gtable_add_grob(base, rect, 2, 1, 2, 3) plot(row) plot(gtable_trim(row))
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