在对象中保存绘图 [英] Save a plot in an object

问题描述

在ggplot2中，可以轻松地将图形保存到R对象中.

In ggplot2, one can easily save a graphic into a R object.

p = ggplot(...) + geom_point()      # does not display the graph
p                                   # displays the graph

标准函数 plot 将图形生成为 void 函数并返回 NULL.

The standard function plot produces the graphic as a void function and returns NULL.

p = plot(1:10)     # displays the graph
p                  # NULL

是否可以将plot创建的图形保存在对象中?

Is it possible to save a graphic created by plot in an object?

推荐答案

基础图形直接在设备上绘制.

base graphics draw directly on a device.

你可以使用

1- recordPlot

2- 最近推出的 gridGraphics 包，将基本图形转换为其等效的网格

2- the recently introduced gridGraphics package, to convert base graphics to their grid equivalent

这是一个最小的例子，

plot(1:10) 

p <- recordPlot()
plot.new() ## clean up device
p # redraw

## grab the scene as a grid object
library(gridGraphics)
library(grid)
grid.echo()
a <- grid.grab()

## draw it, changes optional
grid.newpage()
a <- editGrob(a, vp=viewport(width=unit(2,"in")), gp=gpar(fontsize=10))
grid.draw(a)

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