June 2020
Beginner to intermediate
522 pages
9h 6m
Chinese
Content preview from R 语言经典实例（原书第 2 版）
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258
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第
10
章
图 10-7 缺乏视觉吸引力，但你可以清楚地看到黑色虚线构成主要网格，灰色虚线构成次
要网格。
或者我们可以做一些不那么花哨的修改，获取之前创建的 ggplot 对象 g1，并将灰色
网格线添加到白色背景中，如图 10-8 所示。
g1 +
theme(panel.grid.major = element_line(color = "grey"))
HP
Cars: Horsepower vs. Fuel Economy
Economy (miles per gallon)
35
30
25
20
15
10
100 200 300
图 10-8：灰色主要网格线
10.3.4 另请参阅
请参阅 10.4 节，了解如何将整个预制主题应用于你的图形。
10.4 给
ggplot
图形添加主题
10.4.1 问题
你需要使用预设的颜色、样式和格式集合进行绘图。
10.4.2 解决方案
ggplot 支持
主题
（theme），这些主题是图形设置的集合。要使用其中一个主题，只需
使用 + 将所需的 theme 函数添加到 ggplot：
ggplot(df, aes(x, y)) +
geom_point() +
theme_bw()
图形
｜
259
ggplot2 包中包含以下主题：
theme_bw()
theme_dark() ...
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