How to manually edit a grid.arrange, ggplot_gtable and facet? - r

Question

I'm ploting a Hydrograph but I additionally use facet_grid in R because I have objects with common features.
But when I use facet_grid the plot gets distorted, as shown in the figure below. How can I randerize this?
Note that it is not aligned properly, the scale of the y axis is scrambled, etc.
Among the adjustments I tried, I realized that it is possible to greatly improve this plot. I've created an image based on the above plot, some other attempts on how I'm trying and making some adjustments to paint to demonstrate what I'm trying to do.
Here's my code:
library(ggplot2)
library(grid)
library(gridExtra)
g1 <- ggplot(data_cet,
aes(x = Periodo,
y = Ind_plu)) +
geom_bar(stat = 'identity',
fill = "blue",
position = position_dodge()) +
ylab("Precip.") +
scale_y_reverse(labels = scales::comma) +
theme_bw() +
theme(axis.title.x = element_blank(),
axis.text.x = element_blank(),
axis.ticks.x = element_blank())
g2 <- ggplot(data_cet,
aes(x = Periodo,
y = Nivel,
colour = Bomba)) +
geom_line(aes(group = 1)) +
scale_color_manual(values = c("#0B775E", "#35274A", "#F2300F")) +
labs(colour = "Status CMB") +
facet_grid(data_cet$arranjo + data_cet$Bacia ~.) +
scale_x_date(breaks = datebreaks_m,
labels = date_format("%b/%y")) +
xlab('Período') + ylab('% Nível') +
theme_bw() +
theme(axis.text.x = element_text(face = "plain",
color = "black",
angle = 90),
axis.text.y = element_text(face = "plain",
color = "black"),
legend.title = element_blank(),
strip.background = element_blank(),
legend.position = "bottom")
g1 <- ggplot_gtable(ggplot_build(g1))
g2 <- ggplot_gtable(ggplot_build(g2))
maxWidth = unit.pmax(g1$widths[2:3], g2$widths[2:3])
g1$widths[2:3] <- maxWidth
g2$widths[2:3] <- maxWidth
plot_hyd <- grid.arrange(g1, g2, ncol = 1, heights = c(1, 3))
ggsave(file = "plot_hyd4.pdf", plot_hyd)
My dataset is too large, my apologize for not showing the dataset and dput().

Answer 1

You could add a widths = c(0.9, 1) to grid.arrange (fiddle with the first number some) to get your graphs to line up along the right side.
Otherwise, ggsave your file to a larger pdf. Your element_text objects, such as the legend, are absolute sizes, so if you scale up the pdf dimensions your graphs will look larger by comparison.
The exact values of widths and ggsave(width, height) are going to depend on you data, and unfortunately will take some trial and error. If you're using something like RStudio, I suggest fiddling with the grid.arrange call and finding the widths argument you like before calling ggsave. When you are ready to experiment with different ggsave width and height arguments, run it at a lower dpi the first few times so it processes more quickly.
Note that since you haven't included your data, I haven't tried to recreate this problem - this is just how I've solved this kind of issue in the past. If these suggestions don't work for you, let me know and I can use some built-in datasets to find another solution

Answer 2

Following the logic of the #Pintintended tip for the code. I adopted the layout_matrix argument.
>
plot_hyd <- grid.arrange(g1, g2,
layout_matrix = rbind(c(1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,NA),
c(2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2),
c(2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2),
c(2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2),
c(2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2),
c(2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2),
c(2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2)))
#ggsave(file="plot_hyd4.jpeg",plot_hyd,width=13,height=16,dpi=200)