r - 如何停止 ggrepel 标签在 R/ggplot2 中的 gganimate 帧之间移动?
问题描述
我想在 ggplot 的行尾添加标签,避免它们重叠,并避免它们在动画过程中四处移动。
到目前为止,我可以将标签放在正确的位置并使用 将它们保持为静态geom_text
,但标签重叠,或者我可以防止它们重叠使用geom_text_repel
但标签不会出现在我想要的位置,然后在情节动画后跳舞(后一个版本在下面的代码中)。
我认为一个解决方案可能涉及在 ggplot (p1
下)中有效地创建一个静态层,然后添加一个动画层(p2
下),但似乎不是。
如何在动画 ggplot 中保存绘图常量(即静态)的某些元素?(在这种情况下,行尾的标签。)
此外,随着geom_text
标签按我想要的方式显示 - 在每行的末尾,在绘图之外 - 但是使用geom_text_repel
,标签都在绘图区域内移动。为什么是这样?
以下是一些示例数据:
library(dplyr)
library(ggplot2)
library(gganimate)
library(ggrepel)
set.seed(99)
# data
static_data <- data.frame(
hline_label = c("fixed_label_1", "fixed_label_2", "fixed_label_3", "fixed_label_4",
"fixed_label_5", "fixed_label_6", "fixed_label_7", "fixed_label_8",
"fixed_label_9", "fixed_label_10"),
fixed_score = c(2.63, 2.45, 2.13, 2.29, 2.26, 2.34, 2.34, 2.11, 2.26, 2.37))
animated_data <- data.frame(condition = c("a", "b")) %>%
slice(rep(1:n(), each = 10)) %>%
group_by(condition) %>%
mutate(time_point = row_number()) %>%
ungroup() %>%
mutate(score = runif(20, 2, 3))
这是我用于动画情节的代码:
# colours for use in plot
condition_colours <- c("red", "blue")
# plot static background layer
p1 <- ggplot(static_data, aes(x = time_point)) +
scale_x_continuous(breaks = seq(0, 10, by = 2), expand = c(0, 0)) +
scale_y_continuous(breaks = seq(2, 3, by = 0.10), limits = c(2, 3), expand = c(0, 0)) +
# add horizontal line to show existing scores
geom_hline(aes(yintercept = fixed_score), alpha = 0.75) +
# add fixed labels to the end of lines (off plot)
geom_text_repel(aes(x = 11, y = fixed_score, label = hline_label),
hjust = 0, size = 4, direction = "y", box.padding = 1.0) +
coord_cartesian(clip = 'off') +
guides(col = F) +
labs(title = "[Title Here]", x = "Time", y = "Mean score") +
theme_minimal() +
theme(panel.grid.minor = element_blank(),
plot.margin = margin(5.5, 120, 5.5, 5.5))
# animated layer
p2 <- p1 +
geom_point(data = animated_data,
aes(x = time_point, y = score, colour = condition, group = condition)) +
geom_line(data = animated_data,
aes(x = time_point, y = score, colour = condition, group = condition),
show.legend = FALSE) +
scale_color_manual(values = condition_colours) +
geom_segment(data = animated_data,
aes(xend = time_point, yend = score, y = score, colour = condition),
linetype = 2) +
geom_text(data = animated_data,
aes(x = max(time_point) + 1, y = score, label = condition, colour = condition),
hjust = 0, size = 4) +
transition_reveal(time_point) +
ease_aes('linear')
# render animation
animate(p2, nframes = 50, end_pause = 5, height = 1000, width = 1250, res = 120)
解决方案
供考虑的建议:
具体的排斥方向/数量等
geom_text_repel
由随机种子决定。您可以设置seed
为一个常数值,以便在每一帧动画中获得相同的排斥位置。我认为被排斥的文本不可能超出情节区域,即使您关闭剪辑并在情节限制之外指定一些排斥范围。该软件包的重点是使文本标签彼此远离,同时保持在绘图区域内。但是,您可以扩展绘图区域并使用
geom_segment
而不是geom_hline
绘制水平线,以便这些线在到达被排斥的文本标签之前停止。由于有更多的几何图层
animated_data
用作它们的数据源,因此将&animated_data
相关的常见美学映射放在顶级ggplot()
调用中会更干净,而不是static_data
.
这是一个可能的实现。注释中的解释:
p3 <- ggplot(animated_data,
aes(x = time_point, y = score, colour = condition, group = condition)) +
# static layers (assuming 11 is the desired ending point)
geom_segment(data = static_data,
aes(x = 0, xend = 11, y = fixed_score, yend = fixed_score),
inherit.aes = FALSE, colour = "grey25") +
geom_text_repel(data = static_data,
aes(x = 11, y = fixed_score, label = hline_label),
hjust = 0, size = 4, direction = "y", box.padding = 1.0, inherit.aes = FALSE,
seed = 123, # set a constant random seed
xlim = c(11, NA)) + # specify repel range to be from 11 onwards
# animated layers (only specify additional aesthetic mappings not mentioned above)
geom_point() +
geom_line() +
geom_segment(aes(xend = time_point, yend = score), linetype = 2) +
geom_text(aes(x = max(time_point) + 1, label = condition),
hjust = 0, size = 4) +
# static aesthetic settings (limits / expand arguments are specified in coordinates
# rather than scales, margin is no longer specified in theme since it's no longer
# necessary)
scale_x_continuous(breaks = seq(0, 10, by = 2)) +
scale_y_continuous(breaks = seq(2, 3, by = 0.10)) +
scale_color_manual(values = condition_colours) +
coord_cartesian(xlim = c(0, 13), ylim = c(2, 3), expand = FALSE) +
guides(col = F) +
labs(title = "[Title Here]", x = "Time", y = "Mean score") +
theme_minimal() +
theme(panel.grid.minor = element_blank()) +
# animation settings (unchanged)
transition_reveal(time_point) +
ease_aes('linear')
animate(p3, nframes = 50, end_pause = 5, height = 1000, width = 1250, res = 120)
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