如何为形状着色 [英] How to shade shapes
问题描述
是否可以使用 ggrough (
如何使用 ggrough 为该地图的县添加阴影?请注意，我认为 ggrough 可以处理 geom_col，geom_bar，geom_tile，geom_geom_area，geom_ribbon，geom_violin，geom_point，geom_jitter，geom_dotplot，geom_line和geom_smooth ，但是我不确定关于 geom_sf 或 geom_polygon ；如果没有，添加它们会容易吗?
***更新这是另一个示例，摘自
***结束更新
(这里是一个用 ggrough 创建的示例，它说明了我希望各县的阴影看起来如何:)
这是一次失败的尝试(再次依赖Z.Lin在此处的答案中的代码:
Is it possible to use ggrough (https://xvrdm.github.io/ggrough/index.html) to shade shapes created by geom_sf (preferred) or potentially geom_polygon? See this question for a prior question that gives the look of the plot I have in mind and the accompanying answer by Z.Lin that modifies the package to make it compatible with the current version of ggplot2: Unable to replicate this ggplot2 plot.
Here is a MWE of a map created using geom_sf that I would like to shade (each individual county) using ggrough:
library(tidyverse)
library(magrittr)
library(ggplot2)
library(ggrough)
library(RColorBrewer)
library(tidycensus)
library(viridis)
#install.packages("devtools") # if you have not installed "devtools" package
#devtools::install_github("xvrdm/ggrough")
library(hrbrthemes)
#get nevada shapefile
counties <- get_acs(
geography = "county", year = 2018, geometry = TRUE,
variables = "B19013_001", keep_geo_vars=TRUE
) %>% filter(STATEFP=="32")
counties$GEOID <- as.integer(counties$GEOID)
#############
a <- ggplot() +
geom_sf(data = counties, aes(fill = estimate)) +
scale_fill_viridis(discrete=FALSE, name="", guide=FALSE) +
theme_bw() +
theme(legend.position = c(0.15, .15)) +
theme(plot.subtitle = element_text(hjust = 0.8, vjust=-10, size=30)) +
theme(panel.background = element_rect(fill = 'white')) +
theme(panel.grid = element_blank(),axis.title = element_blank(),
axis.text = element_blank(),axis.ticks = element_blank(),
panel.border = element_blank())+
theme(legend.position = c(0.25, .15), legend.key.size = unit(2,"line"),
legend.title=element_text(size=16),
legend.text=element_text(size=14),
legend.direction = "vertical",
legend.box = "horizontal") +
labs(caption = "")
a
This produces the following:
How can I shade the counties of this map using ggrough or is this not possible? Note that I think that ggrough can handle geom_col, geom_bar, geom_tile, geom_geom_area, geom_ribbon, geom_violin, geom_point, geom_jitter, geom_dotplot, geom_line, and geom_smooth, but I am not sure about geom_sf or geom_polygon; if not, would it be easy to add them in?
***Update Here is another example, taken from https://ggplot2.tidyverse.org/reference/ggsf.html:
nc <- sf::st_read(system.file("shape/nc.shp", package = "sf"), quiet = TRUE)
b <- ggplot(nc) +
geom_sf(aes(fill = AREA))
b
This produces:
***End update
(Here is an example, created with ggrough, of how I want the shading of the counties to look:
)
Here is a failed attempt (again relying on code from Z.Lin's answer here: Unable to replicate this ggplot2 plot):
parse_polygons <- function (svg) {
shape <- "polygon" # was "polyline" in ggrough:::parse_areas
keys <- NULL
ggrough:::parse_shape(svg, shape, keys) %>% {
purrr::map(.,
~purrr::list_modify(.x,
points = stringr::str_squish(.x$points) %>%
{stringr::str_glue("M{.}Z")},
shape = "path"))
}
}
trace(ggrough:::parse_rough, edit = TRUE)
# paste the following function into the pop-up window
function (svg, geom) {
rough_els <- list()
if (geom %in% c("GeomCol", "GeomBar", "GeomTile", "Background")) {
rough_els <- append(rough_els, parse_rects(svg))
}
if (geom %in% c("GeomSmooth", "Background")) { # removed GeomArea / GeomViolin from here
rough_els <- append(rough_els, parse_areas(svg))
}
if (geom %in% c("GeomArea", "GeomRibbon", "GeomViolin")) { # new condition here
rough_els <- append(rough_els, parse_polygons(svg))
}
if (geom %in% c("GeomPoint", "GeomJitter", "GeomDotPlot", "Background")) {
rough_els <- append(rough_els, parse_circles(svg))
}
if (geom %in% c("GeomLine", "GeomSmooth", "Background")) {
rough_els <- append(rough_els, parse_lines(svg))
}
if (geom %in% c("Background")) {
rough_els <- append(rough_els, parse_texts(svg))
}
purrr::map(rough_els, ~purrr::list_modify(.x, geom = geom))
}
options <- list(GeomSf=list(fill_style="hachure",
angle_noise=0.5,
gap_noise=0.2,
gap=1.5,
fill_weight=1))
get_rough_chart(a, options)
This produces the error message:
Error in `*tmp*`[[i]] : subscript out of bounds
***Update
Or with the second example:
options <- list(GeomSf=list(fill_style="hachure",
angle_noise=0.5,
gap_noise=0.2,
gap=1.5,
fill_weight=1))
get_rough_chart(b, options)
Same error.
***End update.
Note also that it is possible to create maps using geom_polygon, so that is of interest as well, though geom_sf is preferred.
library(magrittr)
library(ggplot2)
library(ggrough)
Replace parse_rough using trace
trace(ggrough:::parse_rough, edit=TRUE)
In the popup window, paste this so that parse_rough will use parse_sf for GeomSf.
function (svg, geom)
{
rough_els <- list()
if (geom %in% c("GeomCol", "GeomBar", "GeomTile",
"Background")) {
rough_els <- append(rough_els, parse_rects(svg))
}
if (geom %in% c("GeomArea", "GeomViolin", "GeomSmooth",
"Background")) {
rough_els <- append(rough_els, parse_areas(svg))
}
if (geom %in% c("GeomPoint", "GeomJitter", "GeomDotPlot",
"Background")) {
rough_els <- append(rough_els, parse_circles(svg))
}
if (geom %in% c("GeomLine", "GeomSmooth", "Background")) {
rough_els <- append(rough_els, parse_lines(svg))
}
if (geom %in% c("Background")) {
rough_els <- append(rough_els, parse_texts(svg))
}
if (geom %in% c("GeomSf")) {
rough_els <- append(rough_els, parse_sf(svg))
}
purrr::map(rough_els, ~purrr::list_modify(.x, geom = geom))
}
Create the function parse_sf.
parse_sf <- function (svg) {
shape <- "path"
keys <- NULL
ggrough:::parse_shape(svg, shape, keys) %>% {
purrr::map(.,
~purrr::list_modify(.x,
points = .x$d,
shape = "path"
))
}
}
Create the desired plot
nc <- sf::st_read(system.file("shape/nc.shp", package = "sf"), quiet = TRUE)
b <- ggplot(nc) +
geom_sf(aes(fill = AREA))
b
options <- list(GeomSf=list(fill_style="hachure",
angle_noise=0.5,
gap_noise=0.2,
gap=1.5,
fill_weight=1))
get_rough_chart(b, options)
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