1引言
grid 包中使用 stringWidth/stringHeight 来获取字符串的宽度和高度。
2示例
想象我们要为一个字符串添加一个贴合的矩形框,先绘制文本:
library(grid)
grid.rect()
grid.rect(x = 0.5,y = 0.5,width = 0.5,height = 0.5)
grid.text("hei hei hei.",x = 0.5,y = 0.5)
绘制矩形:
grid.rect(x = 0.5,y = 0.5,
width = stringWidth("hei hei hei."),
height = stringHeight("hei hei hei."),
gp = gpar(fill = "transparent"))
grobWidth/grobHeight 可以获取 grob 对象的宽和高,先画个圆:
grid.circle(x = 0.5,y = 0.5,r = 0.2,gp = gpar(fill = ggplot2::alpha("orange",alpha = 0.5)))
绘制矩形:
grid.rect(x = 0.5,y = 0.5,
width = grobWidth(circleGrob(x = 0.5,y = 0.5,r = 0.2)),
height = grobHeight(circleGrob(x = 0.5,y = 0.5,r = 0.2)),
gp = gpar(fill = "transparent"))
3结尾
路漫漫其修远兮,吾将上下而求索。
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