I would like to change the proportion of the graph covered by the "zoom". If we look at the following image we are at a ratio "graph:zoom" around 1:2 I would like instead a ratio 2:1. In other words, what I want is to reduce the height of the zoom. How should I proceed? Here is my code

require(dplyr)
require(tidyverse)
require(ggforce)
HY <- DebitH %>%
  ggplot(aes(x = Date, y = Débit_horaire))   
  geom_point(alpha = 6/10, size = 0.3, color = "blue")  
  geom_line(alpha = 4/10, size = 0.5, color = "blue")  
  labs(x = "Date", y = "Débit Horaire (m3/s)") 
  theme_bw()  
  theme(panel.grid.major.y = element_line(color = "grey",
                                          size = 0.25,
                                          linetype = 2),
        legend.position = "none")  
  facet_zoom(xlim = as.POSIXct(c("2021-01-15 00:00:00","2021-02-15 00:00:00")))

And here you will find a sample of the data

DebitH <-
structure(list(Date = structure(c(1610233200, 1610236800, 1610240400, 
1610244000, 1610247600, 1610251200, 1610254800, 1610258400, 1610262000, 
1610265600, 1610269200, 1610272800, 1610276400, 1610280000, 1610283600, 
1610287200, 1610290800, 1610294400, 1610298000, 1610301600, 1610305200, 
1610308800, 1610312400, 1610316000, 1610319600, 1610323200, 1610326800, 
1610330400, 1610334000, 1610337600, 1610341200, 1610344800, 1610348400, 
1610352000, 1610355600, 1610359200, 1610362800, 1610366400, 1610370000, 
1610373600, 1610377200, 1610380800, 1610384400, 1610388000, 1610391600, 
1610395200, 1610398800, 1610402400, 1610406000, 1610409600, 1610413200, 
1610416800, 1610420400, 1610424000, 1610427600, 1610431200, 1610434800, 
1610438400, 1610442000, 1610445600, 1610449200, 1610452800, 1610456400, 
1610460000, 1610463600, 1610467200, 1610470800, 1610474400, 1610478000, 
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1610503200, 1610506800, 1610510400, 1610514000, 1610517600, 1610521200, 
1610524800, 1610528400, 1610532000, 1610535600, 1610539200, 1610542800, 
1610546400, 1610550000, 1610553600, 1610557200, 1610560800, 1610564400, 
1610568000, 1610571600, 1610575200, 1610578800, 1610582400, 1610586000, 
1610589600, 1610593200, 1610596800, 1610600400, 1610604000, 1610607600, 
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1610632800, 1610636400, 1610640000, 1610643600, 1610647200, 1610650800, 
1610654400, 1610658000, 1610661600, 1610665200, 1610668800, 1610672400, 
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1.611e 09, 1611003600, 1611007200, 1611010800, 1611014400, 1611018000, 
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1614780000, 1614783600, 1614787200, 1614790800, 1614794400, 1614798000, 
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1614844800, 1614848400, 1614852000, 1614855600, 1614859200, 1614862800, 
1614866400, 1614870000, 1614873600, 1614877200, 1614880800, 1614884400, 
1614888000, 1614891600, 1614895200, 1614898800), tzone = "UTC", class = c("POSIXct", 
"POSIXt")), Débit_horaire = c(5.052, 5.036, 5.009, 4.982, 4.958, 
4.937, 4.917, 4.885, 4.858, 4.834, 4.804, 4.786, 4.769, 4.753, 
4.741, 4.722, 4.713, 4.702, 4.689, 4.68, 4.669, 4.664, 4.658, 
4.645, 4.623, 4.595, 4.567, 4.539, 4.51, 4.48, 4.443, 4.413, 
4.381, 4.352, 4.327, 4.318, 4.291, 4.27, 4.268, 4.268, 4.265, 
4.257, 4.254, 4.258, 4.27, 4.283, 4.295, 4.299, 4.303, 4.307, 
4.305, 4.308, 4.32, 4.334, 4.355, 4.396, 4.457, 4.531, 4.624, 
4.738, 4.879, 5.057, 5.28, 5.558, 5.863, 6.186, 6.562, 6.958, 
7.327, 7.555, 7.638, 7.638, 7.577, 7.452, 7.291, 7.089, 6.867, 
6.646, 6.469, 6.301, 6.161, 6.043, 5.946, 5.872, 5.807, 5.752, 
5.702, 5.67, 5.658, 5.65, 5.647, 5.656, 5.692, 5.74, 5.786, 5.839, 
5.91, 6.003, 6.124, 6.256, 6.374, 6.489, 6.596, 6.686, 6.72, 
6.725, 6.706, 6.684, 6.646, 6.61, 6.578, 6.568, 6.554, 6.54, 
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CodePudding user response：

You could set the size of the zoom panel relative to the main plot via the argument zoom.size which defaults to 2, i.e. the zoom panel is twice the size of the main panel. Hence, to achieve your desired result set zoom.size=.5:

require(dplyr)
require(tidyverse)
require(ggforce)
DebitH %>%
  ggplot(aes(x = Date, y = Débit_horaire))  
  geom_point(alpha = 6 / 10, size = 0.3, color = "blue")  
  geom_line(alpha = 4 / 10, size = 0.5, color = "blue")  
  labs(x = "Date", y = "Débit Horaire (m3/s)")  
  theme_bw()  
  theme(
    panel.grid.major.y = element_line(
      color = "grey",
      size = 0.25,
      linetype = 2
    ),
    legend.position = "none"
  )  
  facet_zoom(xlim = as.POSIXct(c("2021-01-15 00:00:00", "2021-02-15 00:00:00")), zoom.size = .5)