前言
大家经常对ggplot2
中的图例不满意,想要各种修改,今天就介绍下图例的各种修改细节,基本上常用的操作都涉及到了!
library(ggplot2) library(gcookbook)
移除图例
提供3种方法可以在ggplot2
中移除图例。
# 基本图形 pg_plot <- ggplot(PlantGrowth, aes(x = group, y = weight, fill = group)) + geom_boxplot() pg_plot
# 首先可以使用guides()函数移除图例 pg_plot + guides(fill = "none")
然后可以在scale_**
函数中移除,这里是fill,你要根据自己的情况换成shape、color等。
pg_plot+scale_fill_discrete(guide = "none")
第3种方法是在theme中移除。
pg_plot+theme(legend.position = "none")
改变图例位置
也是在theme
中更改,
pg_plot <- ggplot(PlantGrowth, aes(x = group, y = weight, fill = group)) + geom_boxplot() + scale_fill_brewer(palette = "Pastel2") pg_plot + theme(legend.position = "top") # 放在顶部
legend.position的参数可以是left、right、top、bottom,还可以是坐标。
pg_plot+theme(legend.position = c(0.8,0.3))
在ggplot2
中,左下角的坐标是c(0,0),右上角的坐标是c(1,1),你可以自己设置想要放置的位置。需要注意的是,你设置的这个坐标是图例中心点的坐标,可以通过legend.justification
设置图例的哪个位置放在你的坐标上。
# 图例右下角,放在画布右下角 pg_plot + theme(legend.position = c(1, 0), legend.justification = c(1, 0))
p <- ggplot(heightweight, aes(x=ageYear, y=heightIn, shape=sex, colour=sex))+geom_point() p
两个图例更改为水平排列:
p + scale_shape_discrete(label = c("female","male")) + theme(legend.direction = "horizontal")
修改图例的边框和背景
pg_plot+ theme(legend.position = c(0.85,0.2))+ theme(legend.background = element_rect(fill = "orange",color = "black"))
中间还有一部分是白色,需要另外一个参数修改:
pg_plot+ theme(legend.position = c(0.85,0.2))+ theme(legend.background = element_rect(fill = "orange",color = "black"), legend.key = element_rect(fill = "orange") )
改变图例顺序
pg_plot <- ggplot(PlantGrowth, aes(x = group, y = weight, fill = group)) + geom_boxplot() pg_plot
# limits pg_plot + scale_fill_discrete(limits = c("trt1", "trt2", "ctrl"))
也可以在画图之前,通过因子化的方法把数据先排好序再画图哦。
反转图例顺序
2种方法。
pg_plot+scale_fill_discrete(guide = guide_legend(reverse = T))
pg_plot+guides(fill = guide_legend(reverse = T))
修改图例标题
2种方法。
pg_plot <- ggplot(PlantGrowth, aes(x = group, y = weight, fill = group)) + geom_boxplot() pg_plot
labs
里面修改
pg_plot + labs(fill = "Condition")
在scale_*
函数里面修改。
pg_plot+scale_fill_discrete(name = "hahah")
还有一种比较复杂的情况,如果多个一个变量映射给多个图形参数,或者有多个图例,怎么修改呢?像下面这个例子,sex
和shape、color都有关。
p <- ggplot(heightweight, aes(x=ageYear, y=heightIn, shape=sex, colour=sex))+geom_point() p
可以在scale_*
函数中修改:
p + scale_shape_discrete(name = "shape")+ scale_color_discrete(name = "colooorrr")
也可以在legend中修改:
p + labs(shape = "shapppeee",color = "colooorrr")
还可以在guides函数中修改:
p + guides(shape = guide_legend(title = "this is\nshape"), color = guide_legend(title = "cooolor") )
修改图例标题外观
pg_plot <- ggplot(PlantGrowth, aes(x = group, y = weight, fill = group)) + geom_boxplot() pg_plot
可以在theme中修改:
pg_plot + theme( legend.title = element_text( face = "italic", family = "Times", colour = "red", size = 18 ) )
也可以在guides中修改:
pg_plot + guides(fill = guide_legend(title.theme = element_text( face = "italic", family = "Times", colour = "red", size = 14)) )
移除图例标题
pg_plot
可以在theme中修改,也可以在scale_xxx函数中修改,也可以在guides函数中修改。
pg_plot+theme(legend.title = element_blank())
pg_plot+scale_fill_discrete(name = NULL)
pg_plot+scale_fill_hue(guide = guide_legend(title = NULL))
pg_plot+guides(fill = guide_legend(title = NULL))
修改图例标签
pg_plot
pg_plot+scale_fill_discrete(labels = c("label1","label2","label3"))
修改图例标签外观
在theme中修改:
pg_plot + theme(legend.text = element_text( colour = "red", face = "italic", size = 22) )
总结
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