r - Converting treemap to ggplot

Question

The good news: I'm able to create a beautiful treemap using the treemap package.

Data:

forTm <- structure(list(
  UnitGroup = c("1N", "BHU", "CSU", "ED", "Med/Surg", "Med/Surg", "Telemetry", 
            "Telemetry", "Telemetry", "Telemetry", "Telemetry"), 
  Unit = c("A", "B", "C", "ED", "D", "E", "F", "G", "H", "I", "J"),
  Count = c(1L, 1L, 1L, 1L, 15L, 10L, 5L, 2L, 3L, 8L, 4L)), 
  class = c("data.frame"), 
  row.names = c(NA, -11L),
  .Names = c("UnitGroup", "Unit", "Count"))

Treemap:

library(treemap)
tm <- treemap(forTm,
          index = c("UnitGroup", "Unit"),
          vSize = "Count",
          vColor = "Count",
          type = "dens",
          palette = "YlGnBu",
          title = "# Patients Sample Title",
          aspRatio = (1.5),
          fontsize.labels = c(16, 12),
          fontsize.title = 16,
          bg.labels = "white",
          border.lwds = c(5,0))

The problem: class(tm) is a list, and I need to plot the treemap on a page with several ggplots. I anticipate needing to add/rearrange the plots for the end user, so I'd like a relatively flexible solution.

Goal: insert treemap into the following dashboard:

#just stand-ins for the plots
samplePlot <- grid.rect(gp = gpar(fill = "grey")) 
treemapHere <- grid.rect(gp = gpar(fill = "blue")) 

grid.arrange(samplePlot, # plot 1
         treemapHere, # plot 2
         samplePlot, # plot 3
         layout_matrix = rbind(c(3, 2), c(1, 1)),
         top = textGrob("Sample Title", 
                        gp = gpar(margin = margin(10, 0, 10, 0))),
         heights = c(5, 5))

But the solution needs to be flexible enough that I can easily add/rearrange the plots, for example as follows:

grid.arrange(samplePlot, # plot 1
         samplePlot, # plot 2
         samplePlot, # plot 3
         samplePlot, # plot 4
         treemapHere, # plot5
         layout_matrix = rbind(c(1, 2, 3), 
                               c(4, 5, 5)),
         top = textGrob("Sample Title", 
                        gp = gpar(margin = margin(10, 0, 10, 0))),
         heights = c(5, 5))

Ideally I'd find a way to recreate the treemap as a ggplot, because I'm very familiar with ggplot's syntax so I'd have an easy time standardizing the sheet's style. But if there's no way to do that I'll accept any solution(save the treemap as a grob?) that allows me to easily rearrange this graph within my page of ggplots.

What I've tried so far: Honestly, not much. Google hasn't been my friend. The only recommendation I've found is to use treemapify, which I can't do for this particular project.

Answer 1

What if you reconstruct the treemap using ggplot step by step? E.g.

library(tidyverse)
treemapHere <- ggplot(tm$tm, 
   aes(xmin=x0+w, xmax=x0, ymin=y0+h, ymax=y0, fill=ifelse(level==1, NA, color), fill = vSize)) + 
  scale_fill_identity() + 
  geom_rect(aes( size=I((2:1)[level])), color="#303030") + 
  coord_fixed(0.75) + 
  guides(size="none") + 
  cowplot::theme_nothing() + 
  geom_text(aes(x0+w/2, y0+h/2, label=Unit, size=I(scales::rescale(vSize, c(2.5, 3))))) + 
  geom_label(aes(x, y, label=UnitGroup, size=I(scales::rescale(vSize, c(2.5, 7)))), tm$tm %>% group_by(UnitGroup) %>% summarise(x=mean(x0+w/2), y=mean(y0+h/2), vSize=mean(vSize)), inherit.aes=F, fill="white", fontface = "bold")

library(grid)
library(gridExtra)
samplePlot <- grid.rect(gp = gpar(fill = "grey"))   
grid.arrange(samplePlot, # plot 1
         samplePlot, # plot 2
         samplePlot, # plot 3
         samplePlot, # plot 4
         treemapHere, # plot5
         layout_matrix = rbind(c(1, 2, 3), 
                               c(4, 5, 5)),
         top = textGrob("Sample Title", 
                        gp = gpar(margin = margin(10, 0, 10, 0))),
         heights = c(5, 5))