图形紧贴x轴或y轴绘制
scale_y_continuous(expand = c(0,0))+ #Y轴
scale_x_continuous(expand = c(0,0)) #X轴
修改刻度标签
首先确定刻度的分段值(breaks),然后对应修改标签内容(labels)
scale_x_continuous(breaks = c(1990,2000,2010,2020),labels = c("a","b","c","d"))
修改标记点的形状
show_point_shapes(4) + #填写对应图形的编号
theme_classic()#显示点的形状(ggpubr包内的函数)