Question

基于ggplot2包，我想向条形图的不同条形添加不同的纹理。此外，我想将这些纹理添加到小节的图例中。

考虑以下可重复的示例：

# Create example data
data_ggp <- data.frame(category = rep(c("cat1", "cat2", "cat3"), 4),
                       values = c(0.664, 0.045, 0.291, 0.482, 0.029, 0.489, 0.537, 0.027, 0.436, 0.536, 0.028, 0.436),
                       group = c(rep("group1a", 3), rep("group1b", 3), rep("group2a", 3), rep("group2b", 3)))

# Load ggplot2
library("ggplot2")

# Draw barchart (not overlayed)
ggplot(data_ggp, aes(category, values)) + 
  geom_bar(stat = "identity", aes(fill = group), position = "dodge") +
  scale_fill_manual(" ", 
                    labels = c("group1a", "group1b", "group2a", "group2b"),
                    values = c("group1a" = "deepskyblue4", "group1b" = "darkolivegreen4", 
                               "group2a" = "deepskyblue1", "group2b" = "darkolivegreen2"))

对于此条形图，我想对第2a组绘制对角线，对第2b组绘制垂直+水平线。图例也应包含这些纹理。

最终的barplot应该如下所示（用油漆绘制）：

我在堆栈溢出中发现了一个相对较旧的线程：How to add texture to fill colors in ggplot2?

不幸的是，此代码非常复杂，无法自动执行，并且难以应用于不同类型的条形图。此外，我想将纹理添加到我的图例中。

问题：如何将不同的纹理添加到条形图的不同条上+添加到条形图例中？

Answer 1

我可以使用 ggpattern

解决这个问题

# remotes::install_github("coolbutuseless/ggpattern")
library(ggpattern)
library(ggplot2)

data_ggp <- data.frame(category = rep(c("cat1", "cat2", "cat3"), 4),
                       values = c(0.664, 0.045, 0.291, 0.482, 0.029, 0.489, 0.537, 0.027, 0.436, 0.536, 0.028, 0.436),
                       group = c(rep("group1a", 3), rep("group1b", 3), rep("group2a", 3), rep("group2b", 3)))

ggplot(data_ggp, aes(category, values)) + 
  geom_bar_pattern(stat = "identity", 
                   pattern = c("none", "none", "none", # 1st col
                               "none", "none", "none", # 2nd col
                               "stripe", "stripe", "stripe", # 3rd col
                               "crosshatch", "crosshatch", "crosshatch" # 4th col 
                               ),
                   pattern_angle = c(rep(0, 6), rep(45, 3), rep(0, 3)),
                   pattern_density = .1,
                   pattern_spacing = .04,
                   pattern_fill = 'black',
                   aes(fill = group), 
                   position = "dodge") +
  scale_fill_manual(" ", 
                    labels = c("group1a", "group1b", "group2a", "group2b"),
                    values = c("group1a" = "deepskyblue4", "group1b" = "darkolivegreen4", 
                               "group2a" = "deepskyblue1", "group2b" = "darkolivegreen2")) +
  guides(fill = guide_legend(override.aes = 
                               list(
                                 pattern = c("none", "none", "stripe", "crosshatch"),
                                 pattern_spacing = .01,
                                 pattern_angle = c(0, 0, 45, 0)
                                 )
                             ))

^{由 reprex package (v0.3.0) 于 2021 年 1 月 13 日创建}

ggplot2：向彩色条形图和图例添加不同的纹理

1 个答案: