我需要从混合了三个几何图形的融化 data.table 中绘制图形:geom_line
、geom_col
和 geom_point
。 geom_line
和 geom_point
共享 color
美学:
set.seed(1)
time <- 1:10
mag <- 10:20
q_mag <- c("up", "up", "down")
l_a <- sample(1:12, 10)
l_b <- sample(8:20, 10)
p_a <- sample(1:12, 10)
p_b <- sample(8:20, 10)
dt <- data.table(time, mag, q_mag, l_a, l_b, p_a, p_b)
dt <- melt(dt, measure.vars = c("mag", "l_a", "l_b", "p_a", "p_b"))
ggplot(data = dt, aes (x = time)) +
geom_col( data = dt[variable %in% "mag"]
, aes( y = value
, fill = q_mag)) +
scale_fill_grey(start = .4) +
geom_line( data = dt[variable %in% c("l_a", "l_b")]
,aes( y = value
, color = variable)
,size =1) +
geom_point( data = dt[variable %in% c("p_a", "p_b")]
,aes( y = value
,color = variable
,size = variable
,shape = variable)) +
scale_shape_manual( name = element_blank()
, labels = c("Point A", "Point B")
, values = c("circle", "cross")
)+
scale_size_manual( name = element_blank()
, labels = c("Point A", "Point B")
, values = c(4,2)
)+
scale_color_manual( name = element_blank()
, labels = c("Line A", "Line B", "Point A", "Point B")
, values = c("red", "green", "red", "blue")
)
但是,我希望以另一种方式呈现图例:
A 点
为一个大红色圆圈,B 点
作为一个蓝色小十字,A 线
为红色直线(无点),并且B 线
为绿色直线(无点)。
如何实现所需的图例?
最佳答案
这可以通过允许多种色阶的ggnewscale
包轻松实现:
library(ggplot2)
library(data.table)
library(reshape2)
library(ggnewscale)
set.seed(1)
time <- 1:10
mag <- 10:20
q_mag <- c("up", "up", "down")
l_a <- sample(1:12, 10)
l_b <- sample(8:20, 10)
p_a <- sample(1:12, 10)
p_b <- sample(8:20, 10)
dt <- data.table(time, mag, q_mag, l_a, l_b, p_a, p_b)
dt <- melt(dt, measure.vars = c("mag", "l_a", "l_b", "p_a", "p_b"))
dt <- as.data.table(dt)
ggplot(data = dt, aes(x = time, y = value)) +
geom_col(
data = dt[variable %in% "mag"],
aes(
fill = q_mag
)
) +
geom_point(
data = dt[variable %in% c("p_a", "p_b")],
aes(
color = variable,
size = variable,
shape = variable
)
) +
scale_fill_grey(start = .4) +
scale_shape_manual(
name = element_blank(),
labels = c("Point A", "Point B"),
values = c("circle", "cross")
) +
scale_size_manual(
name = element_blank(),
labels = c("Point A", "Point B"),
values = c(4, 2)
) +
scale_color_manual(
name = element_blank(),
labels = c("Point A", "Point B"),
values = c("red", "blue")
) +
new_scale_color() +
geom_line(
data = dt[variable %in% c("l_a", "l_b")],
aes(
color = variable
), size = 1
) +
scale_color_manual(
name = element_blank(),
labels = c("Line A", "Line B"),
values = c("red", "green")
)
关于r - ggplot 融化了数据共享共同的美学,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/65930458/